LED Sequencer (CB21711E)

This is one of the many versions of this circuit that appear on this site. We got it from an internet documentation.

Battery Charger (CB4388E)
This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent...
Full wave power supply (CB22340E)
This source was obtained from a book on transistors from the 60's. The circuit uses germanium...
40W Voltage Inverter (CB25375E)
This powerful inverter provides a high-quality sine wave signal. I found it in a Radio Electronics issue...