Thus, this gain of amplifier about 20 x 20 x 20 or 8,000 times! But this is not so. Obviously, all the step cannot provide the good amplifier, since a transistor has a gain of at least 20 times, and sometimes an in-circuit gain of 100. You may like to trace through the amplifier with the signal tracer project. When you complete soldering, Next, connect the battery via a milli-ammeter to check, that the current is within 30mA and most probably is 5-15mA with no input signal. With care you will find you will not have to cut any of the universal PCB Board tracks and most the parts will fit neatly onto the board as they all 0.1” spacing.įor my son plan will build it on wood board or hard paper it also saving money and fun amazing! Make a layout diagram first which very nearly follows the schematic diagram before attempting any soldering. Or You can assemble the amplifier circuit on A small piece of universal PCB Board 20 – 25 holes. This circuit is a small size you can assemble them on the breadboard. Look: A lot of Power supply circuit Build the 9V mini amplifier Do you have this one? If you do not have it. This circuit requires enough power supply. B1: 9-volt batteries Or 9V power supply circuit.Q2,Q4: BC557 or equivalent, 45V 0.1A, PNP Transistor.
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