Capacitance multiplier (CB7803E)

We found this circuit in an old Popular Electronics. The circuit can be applied to other operational amplifiers.

NAB Equalizer (CB7307E)
This circuit was found in an American audio documentation from 1968. The configuration can be...
12 V to 10 A power supply (CB1219E)
This power supply can provide 10 A currents. Its regulation is made by 7812 integrated circuit. The...
Didactic Comparator (CB1431E)
With this circuit, of a 1977 Radio Shack documentation, it is possible to demonstrate the...