Trigger with PUT (CB24089E)

This circuit was found in the November 1970 Radio Electronics magazine. Its function is to trigger without load bounce.

TIP31 and TIP32 1W Amplifier (CB25709E)
This small audio amplifier was found in the May 1994 issue of Electronics Now magazine. The power...
Audio Relay (CB13614E)
The displayed relay operates with an audio signal applied to the input. The transistors can be...
Photodiode Amplifier 1 (CB13092E)
The circuit shown in the figure and uses the diode in the leakage current operation mode. In it,...