This circuit is from a Mallory 1968’s documentation. The integrated circuit is of the time and the transistor admits equivalents.
You can use this simple audio amplifier on your bench, on an intercom or as a power stage for a...
This is the basic version of a small audio oscillator with the LM3909. The circuit must be powered...
This circuit maintains on a flashing LED at a frequency determined by the capacitor. The...