Circuit Diagram Knowledge: 1

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Tuesday, October 28, 2014

TRANSISTOR TESTER 1

TRANSISTOR TESTER - 1

Transistor Tester - 1 project will test all types of transistors including Darlington and power. The circuit is set to test NPN types. To test PNP types, connect the 9v battery around the other way at points A and B.

10mH choke with 150 turns for the secondary

The transformer in the photo is a 10mH choke with 150 turns of 0.01mm wire wound over the 10mH winding. The two original pins (with the red and black leads) go to the primary winding and the fine wires are called the Sec.

Connect the transformer either way in the circuit and if it does not work, reverse either the primary or secondary (but not both).

Almost any transformer will work and any speaker will be suitable.

If you use the speaker transformer described in the Home Made Speaker Transformer article, use one-side of the primary.

TRANSISTOR TESTER-1

CIRCUIT

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Thursday, September 18, 2014

1 W Home Stereo Amplifier Wiring diagram Schematic

This is a one watt home stereo amplifier module project using the KA2209 IC from Samsung, which is equivalent to the TDA2822. It operates from 3-12V DC & will work from a battery since the dormant current drain is low. It requires no heat sink for normal use. The input & output are both ground referenced. Maximum output will be obtained with a 12V power supply & 8 ohm speaker, however it is suitable for driving headphones from a supply as low as 3V.

The Specifications of the home stereo amplifier :

D.C. input : 3 – 12 V at 200 – 500 mA max
Idle current : approx. 10 mA
Power output : > 1 Watt max. 4-8 ohms, 12V DC
Freq. Resp. : approx. 40 Hz to 200 kHz, 8 ohm, G=10
THD : < 1 % @ 750 mW, 4-8 ohm, 12V
Gain : approx. x10 (20 dB) OR x100 (40dB)
S/N ratio : > 80 dB, G = 20 dB
Sensitivity : < 300 mV, G = 20 dB
Input Impedance : approx. 10 k ohm

Description

The gain is adjustable from ten to 100, i.e. twenty to 40 dB. Start with feedback resistors R1 and R3 of 1k ohm, this will give a gain of ten which ought to be adequate for most applications. In case you need more gain, you can remove resistors R1 and R3.This will give a gain of about 100, or 40 dB.The input attenuation can be adjusted by the potentiometer which can be used as a volume control. The IC gain ought to be kept as low as necessary to accomplish full output, with the in put potentiometer and your signal source at maximum.

1 W Home Stereo Amplifier Circuit Diagram

Voltage Gain = 1+ R1/R2 = 1+R3/R4, however the maximum gain with no outside feedback is about 100, or 40dB. (GdB = 20log Gv)

This will keep the signal to noise ratio as high as feasible. Additional gain provided by the amplifier will reduce the S/N ratio by a similar amount, since the input noise figure is constant. Other values for R1 and R3 of between 1k and 10k ohm can be used if an intermediate gain level is necessary.

If driving a pair of headphones, you may also need a 100 ohm resistor in series with each output to reduce the output level, depending on headphone impedance & sensitivity. Make positive you start with the volume right down to check. Numerous headphones may be driven from the amplifier in the event you wish, since most headphones have at least 16 ohm impedance, or more often 32 ohm.

There are only a few outside parts, the IC contains most of the necessary schemary. R1,R2 and R3,R4 are the feedback resistors. C1 provides power supply decoupling. C2 and C3 are the input coupling capacitors, which block any DC that might-be present on the inputs. C4,C5 block DC in the feed back schema from the inverting inputs, and C6,C7 are the output coupling capacitors. C8, R5 and C9,R6 act as Nobel networks providing a high frequency load to maintain stability at frequencies where loud speaker inductive reactant may become excessive. The pot provides adjustable input level attenuation.

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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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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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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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Friday, June 6, 2014

Mantis 9 1 CNC Mill

The Mantis 9.1 design is a radical departure from version 8 and earlier. Most notably, the part count has been almost halved! The current design has 13 parts, all of which can be made with a handsaw and a drill press. Also, I’ve traded away my alignment free exactly-constrained design for extra stiffness. Several unsuccessful attempts to eradicate the last of the slop in the Z axis on version 8 lead me back to the world of over-constrained parallel rods. My previous attempts at an over-constrained design (versions 1-5) all failed because I was unable to make the rods sufficiently parallel to avoid jamming. What to do? [Link]

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