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 adjustable oscillator has the traditional configuration already presented in other articles. The...
The transistor can be the BD135 and this circuit, found in a 1978 publication, can be powered by...
Found in a Popular Electronics from the 90s, this circuit activates a recorder for automatic...