Non Inverting Amplifier (CB6437E)

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

Infrared detector (CB7019E)
Found in Popular Electronics from the 90s, this circuit detects modulated infrared radiation and...
Common coil assisted ignition (CB6384E)
This circuit was found in a 1964 Electronic Design. The transistors are of the time, but can be...
Low Pass Salen Key Filter (CB5199E)
This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas...