42 kHz oscillator (CB21805E)

This circuit was used as an eraser for old tape recorders. The circuit is from a 1960 Mullard transistor manual.

Lights On Reminder (CB12637E)
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...
High Side Transimpedance Amplifier (CB5228E)
This circuit for Laser Diode power was found in a 2005 Linear Technology manual. In the diagram...
Grounding Test (CB13252E)
This circuit tests whether electronics are properly protected with internal grounding. If the...