Transistor audio amplifier Archives - Amplifier Circuit Design https://amplifiercircuit.net/tag/transistor-audio-amplifier Amplifier Project Schematic Diagram Wed, 01 Aug 2012 23:01:22 +0000 en-US hourly 1 103688205 75W Transistor Audio Amplifier https://amplifiercircuit.net/75w-transistor-audio-amplifier.html https://amplifiercircuit.net/75w-transistor-audio-amplifier.html#respond Wed, 01 Aug 2012 23:01:22 +0000 http://amplifiercircuit.net/?p=1515 It is simple to build an amplifier, using the standard and stable and reliable. The 75 W amplifier circuit presented […]

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]]> 75w power amplifier circuitIt is simple to build an amplifier, using the standard and stable and reliable. The 75 W amplifier circuit presented here is capable of driving 4 ohm, but, although used in 4 ohms, this amplifier has very few errors.

To be aware that there are no short-circuit output, so that when the speaker short, while the amplifier is working (with signal), there is a very real danger that may damage the transistor.

Characteristic of the 75W Transistor Audio Amplifier are as follows …
Sensitivity to 74 Watts output power – a little less than 1W (1W is 75W)
Gain – 27 dB
Frequency range (-3dB) – 10Hz to 23kHz @ 1W
THD, 1 kHz – 0.05% (typical maximum)
Open loop gain – 125dB (no load), 80dB (8 Ohm load)
Input Impedance – 22k ohms
DC-Offset – less than 100 mV (<20 mV typical **)
Noise – <2 mV at the output (-80dB unweighted ref 50W)

This 75W Power Amplifier requires a power supply + /-35V (open circuit voltage), yan will give 70W into 8 ohms with ease.

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]]> https://amplifiercircuit.net/75w-transistor-audio-amplifier.html/feed 0 1515 10 Watt Transistor audio amplifier https://amplifiercircuit.net/10-watt-transistor-audio-amplifier.html https://amplifiercircuit.net/10-watt-transistor-audio-amplifier.html#respond Wed, 28 Sep 2011 13:14:44 +0000 http://amplifiercircuit.net/?p=571 This circuit can have a power output of 10 Watt. It simply uses ordinary transistors. The 10 w amplifier circuit […]

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]]> 10 W Transistor Audio amplifierThis circuit can have a power output of 10 Watt. It simply uses ordinary transistors. The 10 w amplifier circuit is unstable if the input is not connected. When performing the test, connect a resistor (about 3k3).

List of Transistors:
Tr1 : BCY70 (or BC 182L or BC212L or BC214L)
Tr2/3/4  : BFY50/51
Tr5 :  BFX88
Tr6/7 : 2N3055

The Power supply for 10 Watt Transistor audio amplifier requires smoothed voltage about 20 to 30 volts. Peak power of more than 10 Watt. The table shows the approximate voltage that is expected when using a 24v supply and a variable resistor is set to deliver a current of about 40mA in the output stage.

Test point Approximate voltage
Tr1(e) 12·5
Tr1(c) 0·65
Tr2(c) 12·5
Tr3(c) 14·4
Tr4(e) 13·7
Tr5(e) 13·1
Tr5(c) 0·6
Tr7(c) 13·1

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