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 monitors extra-low frequency (ELF) fields. We found it in an American documentation from the...
We can use any type of resistive transducer with central resistance in the range of 10 k ohms to 1...
This circuit controls two lamps so that when one increases in brightness the other decreases. The...