3 A switched regulator (CB8859E)

Found in a 90s Popular Electronics, this circuit provides a current of 3 to 5 A depending on the transistor.

Voice Activated Switch MC2830 (CB14566E)
This Vox circuit uses a specific Motorola component. We found the circuit in the 1990 Linear...
Decade Counter Using the 4017 (CB172)
The basic configuration for a 4017 when used as a decade divider with one-of-ten decoded outputs...
Solar receiver (CB20487E)
This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the...