Peak to Peak AC to DC Converter (CB6103E)

This precision circuit was suggested by General Electric in 1980s documentation. The circuit can be implemented with more modern components.

Gain 10 Tone Detector (CB4906E)
This circuit was found in an application note of the LTC1164 from Linear Technology of the 1990s....
Mini Inverter (CB5143E)
This micropower inverter serves to obtain high voltages with very low current from direct current...
5 V Stabilizer with the 741 - I (CB1175E)
This circuit shows how to get 5 V under low current from an operating amplifier 741. I got this...