power amplifier circuit Archives - Amplifier Circuit Design https://amplifiercircuit.net/tag/power-amplifier-circuit Amplifier Project Schematic Diagram Fri, 23 Dec 2011 21:34:49 +0000 en-US hourly 1 103688205 A Simple 20 Watts Amplifier https://amplifiercircuit.net/a-simple-20-watts-amplifier.html https://amplifiercircuit.net/a-simple-20-watts-amplifier.html#respond Fri, 29 Jul 2011 18:31:02 +0000 http://amplifiercircuit.net/?p=114 The scheme is very simple and if you decide to devote himself to the assembly of amplifiers and investigation of […]

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]]> 20 Watts amplifierThe scheme is very simple and if you decide to devote himself to the assembly of amplifiers and investigation of their activities, it makes sense to start with this amp.

Features :

Rated output power (RL = 4Ohm)
 20W
Operating frequency range (for non-uniformity of 0.5 dB)
 20 … 20000Hz
Conv. THD 0.7%
S / N ratio
 -70dB
Nominal input voltage
 1V
Input resistance
 10Ohm
Supply voltage
 + / -25V

Setting up the amplifier is reduced to setting the quiescent current of the transistor VT9. In the gap of the collector wires included milliammeter and adjustable resistor R11 sets the current 50-70 mA. It then examines the absence of a constant voltage at the amplifier output with an accuracy of 0.1 W.

The whole setting is disabled when the load.
And do not forget to tightly attach the heat sink transistor VT4 transistors VT9. On this depends the temperature stability of the amplifier. You can, for example, hot melt glue or press the flange of the transistor VT9.

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