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.
The idea of this automation can be extended to other applications that involve the control of...
What differentiates this circuit from the previous one (CB15613E) is the non-need to use a...
Found in Elektor Electronics from the 90s, this circuit produces the tone of 1 750 Hz for calling VHF...