Mini Megaphone (CB8952E)

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

Current Monitor (CB15826E)
This circuit, suggested by National Semiconductor, provides an output voltage proportional to the...
10W Dual Tone Siren (CB24393E)
This powerful alarm circuit was found in the July 1975 issue of Radio Electronics magazine. The...
Pulse Triggered Monostable (CB25672E)
This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine....