Circuit Diagram Knowledge: audio

Showing posts with label audio. Show all posts

Showing posts with label audio. Show all posts

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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Wednesday, November 5, 2014

Cell Phone Controlled Audio Video Mute Switch

This cell-phone-controlled audio/ video mute switch is highly useful in automobiles. The circuit automatically disconnects power supply to the audio/video system whenever the mobile handset is lifted off the holder for making or receiving a call. You can use any readily available cell-phone holder with some mi-nor alterations or fabricate it yourself as shown in Fig. 1.

Fig. 1: Proposed cell-phone holder

The circuit is wired around IC LM555 (IC1), the CMOS version of timer NE555, as shown in Fig. 2. IC1 is used as a medium current line driver with either an inverting or non-inverting output. It can sink (or source) current of up to 50 mA only, so take care while handling it. The audio/video system is connected to the circuit via normally opened (N/O) contacts of the relay.

Fig. 2: The circuit of the cell phone-controlled audio/video mute switch

When the cell phone is in its holder, LDR1 does not receive any light from white LED1 and its resistance is high. As a result, the voltage at pin 2 of IC1 re-mains high to provide a low output at pin 3. The low output of IC1 activates relay RL1 and the audio/video system gets power supply via its N/O contacts. LED3 glows to indicate that the audio/video system is ‘on.’ When the handset is taken off the holder, light rays from LED1 fall on LDR1 and its resistance decreases.

As a result, the voltage at pin 2 of IC1 de-creases to provide a high output at its pin 3. The high output of IC1 deactivates relay RL1 and the audio/video system does not get power supply. LED2 glows to indicate that the audio/video system is ‘off.’ Preset VR1 is used to control the sensitivity of the circuit. Zener diode ZD1 is used for protecting white LED1 from the higher voltage. The circuit works off a 12V car battery. Switch S1 can be used to manually switch on/off the audio/video system.

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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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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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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 2, 2014

Simple Audio Mixer Circuits

The amplifiers of a LM3900N device can be conveniently used to make a mixer unit for audio purposes; the unit enables three separate audio signals to be mixed together to produce a composite output.
The audio mixer circuit shown provides this facility using only a single LM39OON device and also enables any one channel to be selected by switches. The currents passing through the resistors R4, R8 and R,, are summed in the input circuit of the fourth amplifier. lf S; is open, amplifier 1 will be driven to saturation by the current passing through R2. lt will therefore be inactive.

Th below shown simple mixer circuit will work with two or three channels, providing excellent input isolation and exceptional frequency response, extending well over the top end of the audio spectrum. lt is usable by one or more instruments plus microphone, or with special effects, such as mixing en input with pink noise, to give surf’. The unit will give 8db gain, and since low-level signals are involved, should be housed in an aluminum box. lf a mains supply is used, the usual anti-hum precautions must be taken. lt is useful to use scaled slider potentiometers, so that effects may be recreated.

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Tuesday, September 23, 2014

10W Audio Amplifier With Bass Boost circuit and explanation

High Quality, very simple design, No preamplifier required

This design is based on the 18 Watt Audio Amplifier, and was developed mainly to satisfy the requests of correspondents unable to locate the TLE2141C chip. It uses the widespread NE5532 Dual IC but, obviously, its power output will be comprised in the 9.5 – 11.5W range, as the supply rails cannot exceed ±18V. As amplifiers of this kind are frequently used to drive small loudspeaker cabinets, the bass frequency range is rather sacrificed. Therefore a bass-boost control was inserted in the feedback loopof the amplifier, in order to overcome this problem without quality losses. The bass lift curve can reach a maximum of +16.4dB @ 50Hz. In any case, even when the bass control is rotated fully counterclockwise, the amplifier frequency response shows a gentle raising curve: +0.8dB @ 400Hz, +4.7dB @ 100Hz and +6dB @ 50Hz (referred to 1KHz).

Amplifier with Bass-Boost: 10W

10W Bass Boost Amplifier Circuit Diagram

Parts:

P1_________________22K Log.Potentiometer (Dual-gang for stereo)
P2________________100K Log.Potentiometer (Dual-gang for stereo)
R1________________820R 1/4W Resistor
R2,R4,R8____________4K7 1/4W Resistors
R3________________500R 1/2W Trimmer Cermet
R5_________________82K 1/4W Resistor
R6,R7______________47K 1/4W Resistors
R9_________________10R 1/2W Resistor
R10__________________R22 4W Resistor (wirewound)
C1,C8_____________470nF 63V Polyester Capacitor
C2,C5_____________100µF 25V Electrolytic Capacitors
C3,C4_____________470µF 25V Electrolytic Capacitors
C6_________________47pF 63V Ceramic or Polystyrene Capacitor
C7_________________10nF 63V Polyester Capacitor
C9________________100nF 63V Polyester Capacitor
D1______________1N4148 75V 150mA Diode
IC1_____________NE5532 Low noise Dual Op-amp
Q1_______________BC547B 45V 100mA NPN Transistor
Q2_______________BC557B 45V 100mA PNP Transistor
Q3_______________TIP42A 60V 6A PNP Transistor
Q4_______________TIP41A 60V 6A NPN Transistor
J1__________________RCA audio input socket

Power Supply : Power

Power Supply Circuit Diagram

Power supply parts:

R11_________________1K5 1/4W Resistor
C10,C11__________4700µF 25V Electrolytic Capacitors
D2________________100V 4A Diode bridge
D3________________5mm. Red LED
T1________________220V Primary, 12 + 12V Secondary 24-30VA Mains transformer
PL1_______________Male Mains plug
SW1_______________SPST Mains switch

Notes:

Can be directly connected to CD players, tuners and tape recorders.
Schematic shows left channel only, but C3, C4, IC1 and the power supply are common to both channels.
Numbers in parentheses show IC1 right channel pin connections.
A log type for P2 will ensure a more linear regulation of bass-boost.
Do not exceed 18 + 18V supply.
Q3 and Q4 must be mounted on heatsink.
D1 must be in thermal contact with Q1.
Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical.
Set the volume control to the minimum and R3 to its minimum resistance.
Power-on the circuit and adjust R3 to read a current drawing of about 20 to 25mA.
Wait about 15 minutes, watch if the current is varying and readjust if necessary.
A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 &C4. Connect C9 to the output ground.
Then connect separately the input and output grounds to the power supply ground.

Technical data:
Output power:
10 Watt RMS into 8 Ohm (1KHz sinewave)
Sensitivity:
115 to 180mV input for 10W output (depending on P2 control position)
Frequency response:
See Comments above
Total harmonic distortion @ 1KHz:
0.1W 0.009% 1W 0.004% 10W 0.005%
Total harmonic distortion @ 100Hz:
0.1W 0.009% 1W 0.007% 10W 0.012%
Total harmonic distortion @ 10KHz:
0.1W 0.056% 1W 0.01% 10W 0.018%
Total harmonic distortion @ 100Hz and full boost:
1W 0.015% 10W 0.03%
Max. bass-boost referred to 1KHz:
400Hz = +5dB; 200Hz = +7.3dB; 100Hz = +12dB; 50Hz = +16.4dB; 30Hz = +13.3dB
Unconditionally stable on capacitive loads

Elektor 303 Circuit

Practical Arduino

Elektor05-2010

Elektor05-2010

Elektor05-2010

Nuts Volts 06-2010

Nuts Volts 06-2010

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Saturday, September 20, 2014

Audio Amplifier MOSFET 200 W

The printed circuit board is very compact , and is composed of two subsets : the command stage and the output stage. All resistors are 1/4 watt 1 % metal film (except if otherwise stated).

Constant current sources of +/- 1 mA are carried out around T5 and T6. The diodes D1 to D6 allow the use of low noise transistors type BC550C and BC560C, the transistors T7 to T10 form the stage driver. The potentiometer P1 allows the adjustment of the quiescient current to 100 mA per output transistor.

The symmetrical power supply is entrusted to a large transformer of 625 VA, 2 * 51 volts + bridge rectifier and 6 reservoir capacitors of 4700 µF, which gives an output voltage of + and - 70 volts per rail.

The output power is 200 Wrms under 8 ohms or 350 Wrms under 4 ohms. Distortion is lower than 0,02 %, damping factor is better than 300, signal-noise ratio is 112 db (balanced A at full power), the input sensitivity is 1,2 volts (200 W under 8 ohms).

Diagram :

The capacitor C3 is not reproduced on the diagram and on the PCB (it is correct).

Proposal of the command stage PCB :

Transistors T9 and T10 must be assembled on a common heatsink with 5° c/w thermal resistance or on the output stage heatsink.

proposal of the output stage PCB :

The points marked A, B and C have to be connected between the two PCB.

The ground (earth) points of PCBs and loudspeaker ground (earth) must compulsorily be connected in star with the 0 Volts of the PSU.

The power transistors must be assembled on a heatsink with a thermal resistance less than 1 ° C/W. They must also be electrically insulated from the heatsink by using a mica insulator + heat-conducting compound or a silicone insulator.

It is possible to use the MOSFET output stage PCB which is also reproduced on the site, but take care with the thermal dissipation of the output transistors (this circuit is perfect for power of 100 Wrms under 8 ohms or 155 Wrms under 4 ohms). It is possible to use two PCBs in parallel to double the number of output transistors, do not place the limitation diodes, the fuses and the RC output circuit on the second PCB.

Bandwidth :

Bandwidth is limited from 5 Hz to 53 Khz (at - 3 db) by the input module (C1, R1, C2, R2). It can be modified according to the application desired. It is useless to increase the bandwidth to the botton (bass) because little useful signal is present at the bottom of the spectrum. In public address sound systems the bandwidth is often limited between 20 and 35 Hz. The loudspeakers are thus protected against too high extreme-bass signals and some more power is available for the remainder of the spectrum.

Source : http://users.swing.be/edwinpaij/ampli_mosfet.htm monggo dipun klik mawon

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Sunday, September 14, 2014

TDA7482 Audio Amplifier 1 x 25W

TDA7482general description:

The TDA7482 is an audio class-D amplifier assembled in Multiwatt15 package specially designed for high efficiency applications mainly for TV and HomeStereo sets. TDA7482 Audio Amplifier 1 x 25W

TDA7482 features:

25W OUTPUT POWER:
RL =8Ω/4Ω; THD = 10%
HIGHEFFICIENCY
WIDE SUPPLY VOLTAGE RANGE (UP TO±25V)
SPLITSUPPLY
OVERVOLTAGEPROTECTION
ST-BY AND MUTEFEATURES
SHORTCIRCUIT PROTECTION
THERMALOVERLOADPROTECTION

TDA7482 circuit diagram:

TDA7482 Audio Amplifier 1 x 25W circuit diagram

TDA7482 sterio circuit layout:

TDA7482 Audio Amplifier 1 x 25W pcb layout

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Audio Powered Noise Clipper Wiring diagram Schematic

Audio Powered Noise Clipper Circuit Diagram.Tl and T2 are 600 to 8 ohm transformers (any transistor radio output transformers with 500 to 4 ohm impedance may be used). Ql is a 2N2222 npn transistor, and Q2 is a 2N2907 pnp transistor. Dl and D2 1N270 signal diodes (HEP 134 or 135). Two transistors, powered by the audio power contained within the signal, will clip signal peaks which exceed the threshold established by the 2.5 potentiometer.

The diodes isolate the positive and negative clipping diagram represented by the npn and pnp transistors, respectively. A desired audio operating level can be established and the potentiometer needs little or no further adjustment.

Audio Powered Noise Clipper Circuit Diagram

Audio

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Saturday, September 13, 2014

LM389 low power audio amplifier

Amplifier circuit below represents a very small amplifier circuit output. Maximum output is no more than 1W, comprehension is low but received a series of sensitive enough, and power amplifier circuit is very suitable for use in radio receiver, especially on FM radio.

Technical information.
Minimum Voltage = 4 Volt DC
Maximum Voltage = 15 Volt DC
Power Output         = 0,325 W
RL                          = 8 Ohm
Ft                            = 40Hz - 18KHz
Icco                        = 6mA

Part List :
R1 = 100K
R2 = 2,7R
R3 = 1K
C1 = 100uF
C2 = 220uF
C3 = 47uF
C4 = 0,01uF

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Friday, September 12, 2014

5W AUDIO AMPLIFIER WITH MUTING

Circuit Diagram for 5W AUDIO AMPLIFIER WITH MUTING

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Wednesday, September 10, 2014

1 W mini audio amplifier circuit

In this circuit requires only three components , namely IC TDA7052 , and 2 capacitor electrolyte. Actually , only with IC we are able to run this amplifier , but the sound less than the maximum. This amplifier circuit requires a minimum voltage of 3 volts and 15 volts maximum. Was 1 Watt power output with 4 Ohm impedance. See this circuit below :

Just IC and 3 components we can make the circuit above.

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TDA2030 Audio Amplifier 1 x40W

TDA2030 general description:

Although there are a number of hybrid output modules on the market, very few of them combine compactness with reasonable price and good performance. One of these few is SGSs used in the present amplifier. The design of the amplifier is straightforward: a power op-amp followed by two output transistors. The audio signal is applied to the non-inverting input of power op-amp IC1 TDA2030 via socket K1 and capacitor C1. The supply current to the IC varies in accordance with the input signal. Consequently, there will be a similarly varying voltage drop across resistors R6, R7, R8, and R9 since these are in the supply lines to the op-amp. As long as the current is lower than about 1A, the voltage drop across the resistors will be insufficient to switch on transistors T1 and T2. This means that outputs up to 2 W into 4 ohm are provided entirely by the op-amp. Once the output current exceeds a level of 1A, the transistors are on and contribute to the power output.

When the Input signal is small, there no quiescent current through the transistor, but there is through the op-amp. Crossover problems are thus obviated. Since the IC also provides thermal compensation, stability of the operating point is ensured.

The supply voltage may lie between 12 V and an absolute maximum of 44 V. Construction of the amplifier on the printed-circuit board should be straightforward. The transistors as well as the IC must be fitted insulated on to a heat sink of about 2 k W. Use plenty of heat conducting paste. The supply line should be protected by a 3.15 A fuse. You can use BD911, BD912 for T1 and T2.

TDA2030 Technical Data:

Supply voltage - 44 V
Maximum output - 22 W into 8 Ohm
Maximum output - 44 W into 4 Ohm

TDA2030 Circuit diagram:

TDA2030 circuit diagram

TDA2030 pcb layout:

TDA2030 pcb and layout

TDA2030 parts list:

Resistors:

R1-R4 - KOhm
R5 - 8.2 KOhm
R6 - R9 - 1.4 Ohm, 1%
R10 - 1 Ohm

Capacitors:

C1 - 470 nF
C2 - 10 uF, 63 V, radial
C3 - 4.7uF, 63 V, radial
C4,C5,C7 - 220 nF
C6 - 2200 uF, 50 V, radial
C8 - 100 uF, 50 V, radial

Semiconductors:

D1, D2 - 1N4001
T1 - BD712
T2 - BD711
IC1 - TDA2030

Datasheet for TDA2030: Download

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Sunday, September 7, 2014

Schematic Audio Amplifier with IC A211D TBA611

See this circuit below:

Datasheet IC A211D

Vcc = 4,5-15 V

Pout = 1 W

RL = 8 Ohm

Ft = 50-15 Khz

Icco = 10 mA

Package = TABS4-14

Manufactered = RFT

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Friday, September 5, 2014

TDA8551 Audio Ampllifier 1 x 1 W

TDA8551general description:

The TDA8551; TDA8551T is a one channel 1 W Bridge-Tied Load (BTL) audio power amplifier capable of delivering 1 W output power to an 8 Ω load at THD = 10% using a 5 V power supply. The circuit contains a BTL power amplifier, a digital volume control and standby/mute logic. The TDA8551T comes in an 8 pin SO package and the TDA8551 in a 8 pin DIP package.

TDA8551 features:

One pin digital volume control

Volume setting with UP/DOWN pulses

Flexibility in use

Few external components

Low saturation voltage of output stage

Standby mode controlled by CMOS compatible levels

Low standby current

No switch-on/switch-off plops

High supply voltage ripple rejection

Protected against electrostatic discharge

Outputs short circuit safe to ground, VP and across the load

Thermally protected.

TDA8551aplications:

Portable consumer products
Personal computers
Telephony

TDA8551circuit diagram:

TDA8551pcb layout:

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Wednesday, September 3, 2014

2x40W Two Channel Class AB Audio Power Amplifier IC

Overview

The STK402-000 series products are audio power amplifier hybrid ICs that consist of optimally-designed discrete component power amplifier circuits that have been miniaturized using SANYOs unique insulated metal substrate technology (IMST). SANYO has adopted a new low thermal resistance substrate in these products to reduce the package size by about 60% as compared to the earlier SANYO STK407-000 series.

Circuit Diagram

2x40W Two-Channel Class AB Audio Power Amplifier IC

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Saturday, August 30, 2014

14 Watt car audio amplifier circuit

Basic operation of this amplifier is on IC TEA2021 ,
In this circuit minimum require voltage is 4 volts and maximum voltage 25 volts. Power output 14 Watt with 4 Ohm impedance. See this schematic.

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