Non-linear operational amplifier IR15186S CB8068E (CB8067E)

Found in a Popular Electronics from the 90s, this circuit can be applied to other operational amplifiers with small changes in component values.

Solar panel charger (CB7265E)
Suggested by National Semiconductor in documentation from the 90s, this circuit uses a switched...
RF and Audio Probe (CB5912E)
Any FET can be used on this 80's circuit. Power can be supplied with batteries. The output is...
Variable Active Cycle Frequency Doubler (CB5027E)
This circuit was found in an Electronics World magazine from 1990. The circuit can be mounted...