Frequency Doubler (CB21065E)

This circuit was obtained from an Analog Devices manual from the 90's. The integrated circuit is from the time.

| Clique na imagem para ampliar |

Mid Treble and Bass Control (CB13201E)
This circuit was found in an old American publication. The integrated circuit used is no longer easy...
Precision Current Source (CB24752E)
Using a transconductance operational amplifier, this circuit was found in July 1983 Radio...
Electroluminescent emergency light (CB23805E)
This battery-powered emergency light circuit was published in an April 1962 Radio Electronics...