This speaker overload protection circuit was found in Radio Electronics from the 1980s. The circuit uses a 9 V relay but can be powered by 12 V for a relay of this voltage.
This high frequency pulse generator was found in an old American documentation. The circuit makes use...
This small 1 W amplifier uses a Motorola integrated circuit from the 1970s. The integrated circuit...
We found this circuit in a 1966 RCA manual. The integrated circuit is unusual, and the Triac must...