Found in an American 1980s documentation, this circuit compares signals from two TTL sources, providing an output that depends on the frequency difference. The circuit can be used as a shield.
This vox was found in Hughes documentation from 1968. The circuit uses components from the era. A...
Although not using transformers, this amplifier may have difficulty mounting if the original...
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...