Battery Charger (CB6394E)

We found this circuit in a 1968 Electronics World. The potentiometer should be set to trigger the SCR when the battery is fully charged.

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Long Term Delay (CB5153E)
We find this circuit in a 1980s documentation. The circuit uses uncommon components today which can...
Four Octaves Electronic Organ (CB1437E)
We found this circuit in a 1977 Radio Shack documentation. The circuit should be powered, for...
Digital Gain Control for Operational (CB15010E)
With the circuit shown in the figure it is possible to digitally control the gain of an...