This simple audio signal tracer or follower can be made with a BC548 instead of the original transistor. The output is made in a small crystal phone. The power can be from 5 to 9V.
One of the most popular EPROM memories of the past is the 2716 2k x 8, whose pinout with practical use...
This circuit inverts the phase of an audio signal, maintaining its intensity. The transistors can...
In the figure we have a simple way to have a peak bargraph indicator. The amplifier is of the...