This circuit serves as an audio output for AM or even FM radios and was found in a Radio Electronics magazine from March 1990. Note the supply voltages.
) This variable frequency oscillator was found in an old American documentation. Transistors allow more...
We found this circuit in an American documentation from the 90s. The circuit produces a 1 kHz...
In the figure we show how to use common diodes to get a reference near 3 V in a car gearbox. The...