This simple 1-transistor audio preamplifier appeared in the June 1968 Radio Electronics magazine. The transistor is a general-purpose type of the time. The gain is 14 dB.
Using a DAC038 IC this circuit is from Radio Electronics from May 1983. The circuit must be...
This circuit with traditional discrete components was found in a 1990 documentation. The circuit can...
This circuit is from an American 80's documentation. The circuit indicates when the voltage of a 9 V...