This circuit was found in a 73 magazine for radio amateurs from the 90s. The circuit uses high voltage transistors and the relay is high voltage as well.
The frequency of the sound produced in the speaker depends on the light that falls on the...
This amplifier was obtained from an Electronics Now from the 90s. The circuit has a dual 26V power...
We present a different voltage regulator that is based on a transconductance operational...