This transformerless 16-ohm speaker circuit was found in a Radio Electronics from October 1963. The circuit is powered by 12 V and the gain is 50 dB.
This circuit can use a pendulum sensor. We found this configuration in a 1994 publication. The...
This circuit produces a sound effect that can range from the sound of a bird to a siren. The...
This circuit, from a former publication of 1968 was originally designed for germanium transistors, but with the...