A simple power amplifier based on KT805 transistors (20 watts). Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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Your attention is invited to another power amplifier. Despite the relatively small output power, it has some undeniable advantages. Firstly, it is just like a felt boot and is completely accessible for repetition. Secondly, it does not contain scarce and expensive components, so it can be assembled even where access to radio components is difficult or there is a hole in your pocket.

The main features are as follows

scheme

The circuit is very simple and if you decide to dedicate yourself to assembling bulk amplifiers and researching their activity, then it makes sense to start with this amplifier. The circuit is very stable and non-capricious.

Details

Transistors VT1 and VT2 must be selected according to the gain. To make your life easier, you can take a ready-made transistor assembly. Resistors R17, R18 can be made of wire.

Setting

Setting the amplifier is reduced to setting the quiescent current of the transistor VT9. A milliammeter is turned on in the collector wire break and a current of 11-50 mA is set by adjusting the resistor R70. Then the absence of a constant voltage at the output of the amplifier is checked with an accuracy of 0,1V.

All. Finished the exercise.

All adjustments are made with the load off.

And do not forget to tightly attach the transistor VT4 to the heatsink of the transistor VT9. The temperature stability of the amplifier depends on this. You can, for example, glue it with hot glue or press it with a flange of the VT9 transistor.

Publication: radiokot.ru

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