High current buffer (CB7280E)

Suggested by Popular Electronics, it is a digital amplifier, for pulses with frequencies up to a few megahertz.

Automotive Tachometer (CB10426E)
This circuit was obtained in a 1978 magazine but can be easily assembled today with a BC547...
Programmable Regulator TL431 (CB4640E)
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...
Current Booster (CB13197E)
This configuration from an American publication from the 1970s shows how to use a pair of power...