Non Inverting Amplifier (CB6437E)

This non-inverting AC amplifier was found on a Popular Electronics. The setting applies to any operational amplifier.

Bistable Neon (CB10505E)
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
Audio Compressor and Preamplifier (CB20009E)
This circuit, from a Motorola manual, uses transistors from the time, but can be implemented with...
Vibrato with the 555 (CB17487E)
This circuit was found in a 1986 publication. The speed of the effect is determined by the 555,...