Mini Megaphone (CB8952E)

Found in Popular Electronics' 90s, this small megaphone is based on LM386. The circuit uses a high impedance microphone.

Adjustable pulse generator (CB9239E)
Found in a 1964 Electronic Design, this circuit generates 1 A pulses with durations from 100 us to...
Lamp Control (CB25902E)
This low-current control circuit has a lamp as a load, but can have other types of devices, such...
Microsecond to 10 minute timer (CB21412E)
This circuit was found in an old American optoelectronics manual. The circuit makes use of an...