This circuit consists of a bass filter that can be used as a subwoofer in a sound system. The circuit is from a Radio Electronics from May 1988.
This circuit of a few tens of milliwatts of power requires a single source. We found it in a Radio...
This circuit is suggested by Texas Instruments in his Optoelectronics Sourcebook. The transistors...
This circuit used in signaling for boats, cars or barriers was found in a 1980s documentation. It still...