Circuit Diagram Knowledge: amplifier

Showing posts with label amplifier. Show all posts

Showing posts with label amplifier. Show all posts

Wednesday, November 19, 2014

TA8210AH Stereo Car Power Amplifier

IC TA8210AH By using this you can apply a series of audio power amplifier is the car audio system. In general, all the speakers in the car using a subwoofer speaker, and woofer. Because the car is not big room so the sound is being required is not too high.

Audio amplifier circuit can work at a minimum voltage 12-volt DC, if supplied under voltage 12-volt amplifier work will be less than the maximum. This amplifier output power up to 200W or 2 x 100W stereo with 8 ohm impedance.

Part List :

Resistor

R1 =1K
R2 =50K trim
R3 =1K
R4 =50K trim
R5 =680R
R6 =680R
R7 =150K
R8 =2R2
R9 =2R2
R10=2R2
R11=2R2

Capacitor

C1 =1uF
C2 =1uF
C3 =47uF
C4 =47uF
C5 =100n/400V
C6 =220uF
C7 =220uF
C8 =100n/400V
C9 =100n/400V
C10=100n/400V

Intregated Circuit

IC1=TA8210AH

Connector

X2-3=in R
X2-2=gnd
X2-1=in L
X1-1,X1-2=Out R
X1-3,X1-4=Out L

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Tuesday, November 18, 2014

Video Amplifier Circuits

Video amplifier circuit is simple and can be used. Video amplifier circuit was constructed from 2 pieces of transistors BC550 and BC560. The source voltage used for supplying the video amplifier circuit is 5VDC. Video amplifier circuit is equipped with a powerful regulator which flows through both transistors T1 and T2, the components used to manage these flows are P1 and P2. Then the video amplifier circuit is also equipped with limiting the maximum current that passes through T1 and T2. The components in black block functions as limiting the maximum current that is passed by the T1 and T2 for no more than 5mA.

Video

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Thursday, November 13, 2014

8 Watt Audio Power Amplifier Schematic

Here is the schematic for an 8 watt audio power amplifier. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. It is very small and portable unit and can be powered through 12V battery. I built the circuit on a Vero Board and had to add extra inductors, capacitors and resistors to prevent oscillation.

Circuit diagram:

8 watt audio power amplifier schematic circuit diagram

8 Watt Audio Power Amplifier Circuit Diagram

Parts:R1 = 47K
R2 = 2.2R/1W
R3 = 220R/1W
R4 = 2.2R/1W
C1 = 100nF-63V
C2 = 10uF-25V
C3 = 470uF-25V
C4 = 2000uF-25V
C5 = 100nF-63V
IC1 = LM383
SPKR = 4ohm/8W

Notes:

IC1 must be installed on a heat sink.
C1 is for filtering and to prevent oscillation and should not be omitted.
The circuit can be built on a Vero Board, universal solder board or PC board, the PC board is preferred.
The circuit draws about 880Ma at 12 V.
By swapping the values of R2 and R3; you can turn this amplifier into a guitar amp with no preamp required.
If you cant find 2000uF, then replace C4 with a 2200uF unit.
If you add a 0.2uF capacitor in series with a 1 ohm resistor to the output you can prevent oscillation of the circuit under certain conditions.

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Wednesday, November 12, 2014

45 Watt Class B Audio Power Amplifier

45W into 8 Ohm - 69W into 4 Ohm, Easy to build - No setup requiredThese goals were achieved by using a discrete-components op-amp driving a BJT complementary common-emitter output stage into Class B operation. In this way, for small output currents, the output transistors are turned off, and the op-amp provides all of the output current. At higher output currents, the power transistors conduct, and the contribution of the op-amp is limited to approximately 0.7/R11. The quiescent current of the op-amp biases the external transistors, and hence greatly reduces the range of crossover.

The idea sprang up from a letter published on Wireless World, December 1982, page 65 written by N. M. Allinson, then at the University of Keele, Staffordshire. In this letter, op-amp ICs were intended as drivers but, as supply voltages up to +/- 35V are required for an amplifier of about 50W, the use of an op-amp made of discrete-components was then considered and the choice proved rewarding.

The discrete-components op-amp is based on a Douglas Self design. Nevertheless, his circuit featured quite obviously a Class A output stage. As for proper operation of this amplifier a Class B output stage op-amp is required, the original circuit was modified accordingly. Using a mains transformer with a secondary winding rated at the common value of 25 + 25V (or 24 + 24V) and 100/120VA power, two amplifiers can be driven at 45W and 69W output power into 8 and 4 Ohms respectively, with very low distortion (less than 0.01% @ 1kHz and 20W into 8 Ohms).

This simple, straightforward but rugged circuit, though intended for any high quality audio application and, above all, to complete the recently started series of articles forming the Modular Preamplifier Control Center, is also well suited to make a very good Guitar or Bass amplifier. Enjoy!Circuit diagram:

45W Class-B Amplifier Circuit Diagram

Parts:R1______________18K - 1/4W Resistor
R2_______________3.9K - 1/4W Resistor
R3,R6____________1K - 1/4W Resistors
R4_______________2.2K - 1/4W Resistor
R5______________15K - 1/4W Resistor
R7______________22K - 1/4W Resistor
R8_____________330R - 1/4W Resistor
R9,R10__________10R - 1/4W Resistors
R11,R12_________47R - 1/4W Resistors
R13_____________10R - 1W Resistor

C1_______________1µF - 63V Polyester Capacitor
C2_____________470pF - 63V Polystyrene or Ceramic Capacitor
C3______________47µF - 25V Electrolytic Capacitor
C4______________15pF - 63V Polystyrene or Ceramic Capacitor
C6_____________220nF - 100V Polyester Capacitor
C6_____________100nF - 63V Polyester Capacitor

D1,D2,D3,D4___1N4148 - 75V 150mA Diodes

Q1,Q2________BC560C - 45V 100mA Low noise High gain PNP Transistors
Q3,Q4________BC556 - 65V 100mA PNP Transistors
Q5___________BC546 - 65V 100mA NPN Transistor
Q6___________BD139 - 80V 1.5A NPN Transistor
Q7___________BD140 - 80V 1.5A PNP Transistor
Q8__________2N3055 - 60V 15A NPN Transistor
Q9__________MJ2955 - 60V 15A PNP Transistor
Power supply :

power

Power Supply Circuit Diagram

Parts:R1_______________3.3K - 1/2W Resistor
C1,C2_________4700µF - 50V Electrolytic Capacitors
C3,C4__________100nF - 63V Polyester Capacitors
D1_____________200V 8A Diode bridge
D2_____________5mm. Red LED
F1,F2__________4A Fuses with sockets
T1_____________230V or 115V Primary, 25+25V Secondary 120VA Mains transformer
PL1____________Male Mains plug
SW1____________SPST Mains switchComments:

The main design targets for this amplifier were as follows:

Output power in the 40 - 70W range
Simple circuitry
Easy to locate, low cost components
Rugged performance
No setup

Notes:

2N3055 and MJ2955 transistors were listed for Q8 and Q9 as the preferred types, but many different output transistors can be used satisfactorily: TIP3055/TIP2955, TIP35/TIP36, MJ802/MJ4502 amongst others.
Discrete op-amp output transistors Q6 and Q7 do not require any heatsink as their cases remain at ambient temperature. Power transistors Q8 and Q9 should be mounted on a black, finned heatsink as usual.

Technical data:Output power (1KHz sinewave):

45 Watt RMS into 8 Ohms - 69W RMS into 4 Ohms

Sensitivity:

0.81V RMS input for 45W output

Frequency response @ 1W RMS:

15Hz to 23KHz -0.2dB

Total harmonic distortion @ 1KHz:

1W 0.008% 20W 0.008% 45W 0.016%

Total harmonic distortion @10KHz:

1W 0.01% 20W 0.015% 45W 0.025%

Unconditionally stable on capacitive loads

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Thursday, November 6, 2014

200w Audio Power Amplifier

This audio amplifier circuit delivers up to 200 W of top-class quality for loudspeaker from 4 to 16 ohm. Operating voltage is between 24 and 36 V, max 5 A. The frequency response is from 20 to 20000 Hz. Please take special care that the transistors and the IC’s have been fixed firmly and solely one or two separated cooling elements with sufficient dimensions for this purpose (thermal resistance < 1K/W).

200W Audio Power Amplifier Circuit Diagram :

200w-amplifier-schematic-Circuit

200w-amplifier-schematic-Circuit

Doing so it is necessary to mount the transistors and the IC’s insulated (with mica washes and plastic nipple). Please make sure before first operation that the transistors and the IC’s really do not have any electrical connection towards the cooling plate! The transistors have to be placed plane and firmly onto the cooling element! It is of extraordinary importance with this high-power amplifier that there is a considerable heat dissipation. The already mounted cooling element should be situated in a well ventilated case.

The PSU should be sufficiently powerful, power consumption of the amplifier may increase up to 5A. In case of using an unstabilised power supply. It is advisable to place a transformer of max 28V.
The amplifier will the show approx. 120W at a 4-Ohm loudspeaker, for it no-load voltage of the power supply will not be to high. If it is desired to use complete power, it is necessary to place a stabilised power supply with approx. 36V 5A. No-load voltage should not pass over 44V!
The cables leading the current supply and to the loudspeakers should have at least a cross section of min. 1.5 mm^2. The connected loudspeaker have to be equiped according to the high output power and should not have a lower impedance as 4 Ohm! With lower connection impedance and short circuit within the loudspeaker wiring, the transistors will be destructed.

The amplifier has an input sensitivity of approx. 500 … 800 mV. Therefore, it is possibile to connect directly at the amplifier tape decks, tuners, etc. In case there are connected signal sources with lower output voltage, it is necessary to pre-connect a preamplifier. Then it will alse be posible to connect microphones, etc.

200W audio amplifier PCB :

200w-amplifier-front-pcb

Parts List :

IC1, IC2 = 2 IC’s TDA2030
T1, T3 = 2 transistors KT818 or BD708
T2, T4 = 2 transistors KT819 or BD705
C1, C2, C3, C4, C7 = 5 capacitors 150 nF
C5 = 1 elca 10uF 63V
C8 – 1 capacitor 1.8 nF
R1, R7, R9 = 3 resistances 100K
R2, R3, R10, R11 = 4 resistances 2.2 Ohm
R4, R5 = 2 res. 2K
R6, R8 = 2 res. 1 Ohm
R12, R13 = 2 res. 2 res. 3.3K
D1…D4 = 1N4001, 1N4002, 1N4003
1 PCB board approx 56×51 mm

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Sunday, November 2, 2014

10 W Audio Amplifier Circuit

This circuit is a general-purpose 10-W audio amplifier for moderate-power PA or modulator use in an AM transmitter. With higher voltages and a change in bias resistors, up to 30 W can be obtained. The Output Stage Amplifier using transistor 2N3055 and MJE2055.

10 W Audio Amplifier Circuit Diagram

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Friday, October 31, 2014

Power Amplifier MJ15003 MJ15004 c200

The c200 is the result of numerous diyers request for a basic discrete power amplifier. As such, this amplifier is specially designed to meet the following: fairly high power output. easy to construct. use common components. no oscillations. have current limit protection. above average hifi performance. bridgeable for HT subs. rugged enough for party use. Power Output Output of the c200 into 8 ohms before clip is 125 Watts. When loaded to 4 ohms, the output is increased to 200 Watts. With 2 channels operating in bridged mode, power output is a respectable 400 watts into 8 ohms. Output Transistors For easy procurement, very common transistors have been chosen for the c200. The power transistors comprise of 4 pieces of MJ15003 and MJ15004. Though "slow" (fT=2MHz) by todays standards, these transistors are easily available, reasonably priced, has sufficient power rating and the necessary SOA for audio. For those who prefer to use 2N3055 and MJ2955, the c70 model, with 70 Watts/RMS output is available. Vas & Drivers TIP29C/30C are used for these stages. Though equally slow (fT=3MHz), they are chosen based on availability and cost. Input Differential 2N5551 is used for input. Again, this is a common part number with properties suitable for audio.

THD Testing

Before we proceed with power testing, substitute the dummy load with a 200 watts, 8 ohms resistor. With the probes of the THD analyzer connected across the load, spot frequencies of 200Hz, 1KHz, 10KHz and 20KHz are used to test the amplifiers THD at 1Watt, 60Watts and its rated output of 125Watts. You should be able to record similar readings as in Fig 5. It is recommended that the power heatsink and dummy load be suitably cooled to avoid overheating. For 4 ohms testing, replace load with a 400 watts resistor.

Fig 5 - THD + N

Note that as you gradually increase the output to maximum level, the output waveform should not exhibit any signs of distortion until clip.

The Power Supply Unit (PSU)

The PSU (Fig 9) is a conventional, unregulated supply. Input fuse F1 is for safety. Mains switch SW1, has its contacts straddled by a 4700pF X2 capacitor to suppress "popping" during switch-on. T1 is the power transformer with a secondary output of 40-0-40Vac. BR1 is the bridge rectifier and C2,C3 are the filter capacitors for DC smoothing. Power Supply Unit For monoblock, C2,C3 = 10,000uF x2/63V minimum. Transformer secondary should be rated for 250VA. For stereo, C2,C3 = 22,000uF x2/63V minimum. Transformer should be upgraded to 500VA. Supply rails (Vs) are +-53Vdc.

The c300 up close

This 300 Watts/RMS amplifier is meant for those who are not only looking for higher power, but superior performance as well. In order to achieve this, the c300 features some advanced techniques that are absent in its smaller counterpart (c200).

Additions in 1st Gain Stage

Cascodes

Right at the very first gain stage, cascodes (Q5,6) are adopted. They serve to improve the high frequency performance of the c300. These cascodes are biased to approximately midpoint between 0V and +V by zener diode D1 (33V).

Current Mirrors

The first stage also contains current mirror Q3,4. As the name implies, the mirror forces equal current in the LTP (long tail pair). It is known for its active loading and high gain properties.

Emitter Degeneration Resistors
Slew rate of the input differential is improved by resistors R6,7,8,9,10. In the absence of matched transistors, preset R10, is used for trimming DC to a minimum at the output of the amplifier.

Buffering the 2nd Stage

The VAS mod
The 2nd stage is direct coupled to the differential via a darlington Q8. This effectively buffers Q10, the main transistor that is amplifying the voltage from loading the preceding stage. Q10 is biased into class A by constant current source Q12. Capacitor C9 sets the dominant pole in Miller compensation.

Thermal Tracking

The remaining parts of the circuit is conventional. Vbe multiplier Q11, adjust the bias for the output transistors which is in full complementary EF configuration. Q11 must be thermally coupled to the main power heatsink for proper thermal tracking. VI Limiting network consists of Q13,14, R25~30 and D3,4. This network is optional, and can be omitted if desired.

THD of c300

Biasing of output transistors

All THD readings were done with outputs biased to 20mV across 0.39 ohms emitter resistor. This works out to approximately 55mA per output transistor in idling state.

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Thursday, October 30, 2014

800W high power mosfet amplifier

This amplifier can be used for practically any application that requires high power, low noise, distortion and excellent sound. Examples would be Sub-woofer amp, FOH stage amplifier, One channel of a very high-powered surround sound amplifier etc.

800W

For detail explanation about how this circuit works include the large schematic diagram, power supply schematic diagram and complete component listing, link download this complete article.

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Low Output Power Amplifier

This Low Output Power circuit was a presented,it can go power output around 1 Watt, whilst connected to a power supply 9 volt. The pro of this Low Output Power Amplifier is with the purpose of it uses a dual dear ton to enhance the size at the same time as much as of input impedance about 20 Meg ohm. This circuit unlike other circuits,the input impedance is a constant about 20 Meg ohm each time, whether to adjust the volume control on several level.

Low

Low Output Power Amplifier Diagram Schematic

The components participating in the circuit, it is tightfisted, especially the BC549 transistor output amount after the increase force be present very distorted, it have got to reduce the current level to a safe By dipping the volume down. The sector output in place of the R1 and C1 in order to reduce the oscillator profit is, the truth to the output sector, with an op-amp acts drive dual complementary.

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Wednesday, October 29, 2014

Mic Audio Amplifier Circuit Diagram

The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts. It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier.

Resistor R1 provides the necessary bias for the condenser mic while preset VR1 functions as gain control for varying its gain. In order to increase the audio power, the low-level audio output from the preamplifier stage is coupled via coupling capacitor C7 to the audio power amplifier built around BEL1895 IC.BEL1895 is a monolithic audio power amplifier IC designed specifically for sensitive AM radio applications that delivers 1 watt into 4 ohms at 6V power supply voltage.

It exhibits low distortion and noise and operates over 3V-9V supply voltage, which makes it ideal for battery operation. A turn-on pop reduction circuit prevents thud when the power supply is switched on. Coupling capacitor C7 determines low-frequency response of the amplifier. Capacitor C9 acts as the ripple-rejection filter.

Mic Audio Amplifier Circuit Diagram
.

Condenser Mic Audio Amplifier Circuit Diagram

Capacitor C13 couples the output available at pin 1 to the loudspeaker. R15-C13 combination acts as the damping circuit for output oscillations. Capacitor C12 provides the boot strapping function. This circuit is suitable for low-power HAM radio transmitters to supply the necessary audio power for modulation. With simple modifications it can also be used in intercom circuits.

Author: D. Prabakaran - Copyright: Electronics For You Mag

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Dual Mode Microphone Pre Amplifier

This is a microphone pre-amp which I designed intended for function with a SoundBlaster(TM) AWE 64 charge sound license; but it be supposed to exist apt for one compatible tag otherwise PC audio input which provides a 5 Volt supply (via a 2k2, or else thereabouts, built-taking part in current-limiting resistor) by the side of the ring call of a stereo jack plug inserted into the "Mic In" socket of the license/PC. (N.b. it has lone been tested with the AWE 64 certificate.)

The circuit has the following skin tone :

(1) It wish without human intervention detect whether a mike plugged into it is of the electret (condenser) otherwise dynamic type and will switch sandwiched between respective "low-addition" and "far above the ground-gain" modes accordingly. The van-detection relies on help of a stereo plug fitted to an electret mike and use of a mono plug fitted to a dynamic mike.

(2) It is powered just by the 5 Volt existing next to the "Mic in the field of" socket.

(3) It is trivial adequate to happen housed in a standard plastic 35mm film flask (remember folks?).

(4) A trimmer allows the next of kin win intended for the two microphone types to be adjusted.

(5) The gain is sufficient to award something like 60mV summit-to-peak next to the "Mic In" socket, obligatory for complete recording level at home WaveStudio.

(6) In conjunction with the licenses built-in input amplifier, the circuit provides a lifeless frequency response done the audio range, with -3dB points on <10 hz and 19 khz.

(7) Input impedance > 10k. Output impedance <1k

Dual-Mode

Component Values :
R1 = R7 = 4k7; R2 = R3 = 47k; R4 = 39k; R5 = R6 = 100k; R8 = 220; R9 = 10k; R10 = 2k2 (all 1/8 Watt). VR1 = 10k
horizontal pre-set. C1 = 47uF; C2 = C3 = C4 = 10uF (all 10V or greater, miniature radial electrolytics). Tr1 = Tr2 = Tr3 = Tr4 = Tr5 = BC108, BC184, BC547, ZTX337 or similar low-power (preferably low noise) NPN transistor

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Monday, October 27, 2014

200W Stereo High Power Amplifier LM3886

This audio amplifier designed uses two LM3886 per channel, in parallel circuit, based on the PA100 parallel amplifier detailed in National Semiconductors application note - AN1192. This amplifier can deliver about 50W into a 8-ohm speaker and 100W into a 4-ohm speaker. This is a stereo amplifier and therefore 4 LM3886s are used.

The LM3886 circuit is in a non-inverted configuration, so the input impedance is determined by the input resistor R1, i.e. 47k. The 680 ohm and 470pF resistor capacitor filter network is used to filter out the high frequency noise at the RCA input. The 220pF C4 and C8 capacitors are used to shot out the high frequency noise at the LM3886 input pins.

I used high quality audio grade capacitors at several locations: 1uF Auricap at the input for DC blocking, 100uF Blackgate for C2 and C6, and 1000uF Blackgate at the supply filter.

LM3886 Power Amplifier Schematics

The PCB is designed in a way that the power ground is separated from the signal ground, as you can see from the below layout. The signal ground is located in the middle and surrounded by the power ground. There is a thin trace near C5 connecting them. The PCB layout is done by using PADS PowerPCB 5.0. I think it is a powerful layout software.

Amplifier Printed Circuit Board (PCB)

Amplifier Printed Circuit Board Bottom

Amplifier Printed Circuit Board Top

Amplifier Printed Circuit Board

Amplifier Power Supply
The power supply used is a regulated power supply. I used 10000uF per rail before the LT1083 regulator. After the regulator, I have 100uF on the regulator board. The advantage of using regulator is that the power supply ripple voltage is removed. If power regulation is not used, I can hear very little 50/100Hz hum from the speaker.

The high current MUR860 diode is used to ensure high current flow. The voltage regulator used is LT1083, it can provide about 8A of current. Transformer used here is a 500VA 2x 25V. The power supply is then regulated by 2 LT1083, after the regulation, the voltage is 30V.

Power Supply Recomended

I did some DC measurement and the result is quite good, I got 7 mV of DC offset at the speaker terminal. The voltage difference between the output of the 2 chips is less then 1 mV.

The sound of this amplifier is similar to my LM3875 amplifier, which is very clean and detail. It has no hum, no hiss and no noise. Compared to the LM3875 Gainclone, this amp can deliver twice the power to my 4-ohm speaker, and it improves the dynamics and bass punch a lot.

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Very Simple Bench Amplifier Diagram Circuit

A small 325mW amplifier with a voltage gain of 200 that can be used as a bench amplifier, signal tracer or used to amplify the output from personal radios, etc. The circuit is based on the National Semiconductor LM386 amplifier. In the diagram above, the LM386 forms a complete non-inverting amplifier with voltage gain of x200. A datasheet in PDF format can be downloaded from the National Semiconductor website. The IC is available in an 8 pin DIL package and several versions are available; the LM386N-1 which has 325mW output into an 8 ohm load, the Lm386N-3 which has 700mW output and the LM386N-4 which offers 1000mW output. all versions work in this circuit. The gain of the Lm386 can be controlled by the capacitor across pins 1 and 8. With the 10u cap shown above, voltage gain is 200, omitting this capacitor and the gain of the amplifier is 20.

Finished project:

Circuit diagram:

Bench Amplifier Circuit Diagram

The IC works from 4 to 12Volts DC, 12Volt being the maximum recommended value. The internal input impedance of the amplifier is 50K, this is shunted with a 22k log potentiometer so input impedance in this circuit will be lower at about 15k. The input is DC coupled so care must be taken not to amplify any DC from the preceeding circuit, otherwise the loudspeaker may be damaged. A coupling capacitor may included in series with the 22k control to prevent this from happening.

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Sunday, October 26, 2014

Playback Amplifier For Cassette Deck

For some time now, there have been a number of tape cassette decks available at low prices from mail order businesses and electronics retailers. Such decks do not contain any electronics, of course. It is not easy to build a recording amplifier and the fairly complex magnetic biasing circuits, but a playback amplifier is not too difficult as the present one shows. The stereo circuits in the diagram, in conjunction with a suitable deck, form a good-quality cassette player. The distortion and frequency range (up to 23 kHz) are up to good standards. Moreover, the circuit can be built on a small board for incorporation with the deck in a suitable enclosure. Both terminals of coupling capacitor C1 are at ground potential when the amplifier is switched on.

Circuit diagram:

Cassette

Cassette Deck Playback Amplifier Circuit Diagram

Because of the symmetrical ±12 V supply lines, the capacitor will not be charged. If a single supply is used, the initial surge when the capacitor is being charged causes a loud click in the loudspeaker and, worse, magnetizes the tape. The playback head provides an audio signal at a level of 200–500 mV. The two amplifiers raise this to line level, not linearly, but in accordance with the RIAA equalization characteristic for tape recorders. Broadly speaking, this characteristic divides the frequency range into three bands:

Up to 50 Hz, corresponding to a time constant of 3.18 ms, the signal is highly and linearly amplified.
Between 50 Hz and 1.326 kHz, corresponding to a time constant of 120 µs, for normal tape, or 2.274 kHz, corresponding to a time constant of 70 µs, for chromium dioxide tape, the signal is amplified at a steadily decreasing rate.
Above 1.326 kHz or 2.274 kHz, as the case may be, the signal is slightly and linearly amplified. This characteristic is determined entirely by A1 (A1’). To make the amplifier suitable for use with chromium dioxide tape, add a double-pole switch (for stereo) to connect a 2.2 kΩ resistor in parallel with R3 (R3’). The output of A1 (A1’) is applied to a passive high-pass rumble filter, C3-R5 (C3’-R5’) with a very low cut-off frequency of 7 Hz. The components of this filter have exactly the same value as the input filter, C1-R1 (C1’-R1’). The second stage, A2 (A2’) amplifies the signal ´100, that is, to line level (1V r.m.s.).

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Wednesday, October 22, 2014

HiFi Headphone amplifier Circuit

HiFi

HiFi Headphone amplifier

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Thursday, October 16, 2014

Super Hi Fi Headphone Amplifier Circuit Diagram

This is a Super Hi-Fi Headphone Amplifier Circuit Diagram.

Super Hi-Fi Headphone Amplifier Circuit Diagram

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Wednesday, October 15, 2014

Build a 15W Bridge Audio Amplifier Circuit based TDA2002

Build a 15W Bridge Audio Amplifier Circuit based TDA2002. 15W bridge audio amplifier circuit which use 2 pieces of TDA2002. This is audio amplifier for general, work with a single power supply. Use 2A power supply transformer for maximum performance and heatsink should be used to keep the IC from overheating.

Build a 15W Bridge Audio Amplifier Circuit based TDA2002

Component part list:

R1-5 = 2.7?
R2 = 100?
R3-4 = 2.2?
R6 = 220?
R7 = 1M?
TR1 = 100K? trimmer

C1-9 = 10uF/16V
C2-8 = 220uF/16V
C3-4-5-7 = 100nF/63V
C6=470uF/25V
IC1-2=TDA2002
Lsp = 4 – 8?/40W Loundspeaker

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Thursday, October 9, 2014

Amplifier 250 500W with transistors MJ15003

GENERAL DISCRIPTION :The circuit is based around (TL 071) manufactured by NATIONAL semiconductors (MJ15003) by ON semiconductors It is a high fidelity audio power amplifier. Designed for demanding consumer and pro-audio applications. You can also use this circuit with AV receivers, Audiophile power amps, Pro Audio High voltage industrial applications etc Amplifier output power maybe scaled by changing the supply voltage and number of output devices.

General Specifications
Rated Power Output
(20Hz to 20kHz Continuous Average Sine Wave)
250 watts into 8 ohms
500 watts into 4 ohms
Power Bandwidth
(250 watts into 8 ohms)
20Hz to 40kHz (0dB to -3dB)
Frequency Response
1 watt into 8 ohms
20Hz to 100kHz (0dB to -1.0 dB)
250 watts into 8 ohms
20Hz to 20kHz (Flat)
Input Sensitivity
+3 dBV
(1.4V RMS produces an output of 350 watts into 8 ohms)
Input Impedance
33K ohms, Unbalanced
Rise Time
2.0 microSeconds
Total Harmonic Distortion (THD)
Full Power(250 watts into 8 ohms)
Less than 0.007 % THD @ 1kHz
Less than 0.08 % THD @ 20Hz to 20kHz
Half Power (125 watts into 8 ohms)
Less than 0.003 % THD @ 1kHz
Less than 0.03 % THD @ 20Hz to 20kHz
10 watts into 8 ohms
Less than 0.003 % THD @ 1kHz
Less than 0.01 % THD @ 20Hz to 20kHz

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Sunday, October 5, 2014

LM3900 OTL Amplifier 60W

This is power amplifier OTL circuit,It is old but good amp(classic) I like it.
It is have power output 60W at 8ohm speaker.
I use IC op-amp LM3900 is mian part in this circuit.
The LM3900 function amp audio signal,ad have transistor 2N3055 x3 for boost power sound audio.

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Thursday, October 2, 2014

Simple Wideband RF Amplifier Circuit

The feedback circuit is formed by RF transformer Tri. The input and output impedance of the preamplifier is 509 for optimum perform- ance. Network Rs-Cs may have to be added to preclude oscillation outside the pass-band, which ranges from about 100 kHz to 50 MHz.
This circuit is of the second kind, using an RF power transistor as the active element.
Feedback is also required to ensure correct termination . (50 Q) of the aerial, since bipolar transistors normally exhibit a low input impedance.
The input winding is l turn, the out- put winding 5 turns with a tap at 3 turns. is formed by RF transformer Tri. The input and output impedance of the preamplifier is 509 for optimum performance.
Network Rs-Cs may have to be added to preclude oscillation outside the pass-band, which ranges from about 100 kHz to 50 MHz. The gain is approximately 9.5 dB, the noise figure is between 2 and 3 dB, V and the third-order output intercept point is at least 50 dBm. The input/output transformer is wound on a Type FT37-75 fer- rite core from Micrometals. The input winding is l turn, the output winding 5 turns with a tap at 3 turns.
Also, the noise figure is not increased because virtually no signal is lost. The common base amplifier is based on a UHF class A power Q transistor Type 2N5lO9 from Motorola.
The gain is approximately 9.5 dB, the noise figure is between 2 and 3 dB, V and the third-order output intercept point is at least 50 dBm. The input/output transformer is wound on a Type FT37-75 ferrite core from Micrometals.
A linear RF amplifier can be made in two ways: (l) with the aid of a linear active element, or (2) with a non-linear element operating with negative feed- back.

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