Logic probe (CB10024E)

This circuit was found in documentation from the 1980s. Transistors are general-purpose types like the BC548 for NPN and the BC558 for PNP.

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78xx power supply with increased voltage (CB21684E)
In the figure we have the way to increase the voltage of a 78xx by adding a zener diode. The...
Emergency Light (CB1561E)
With the configuration shown in the figure, a common 12 V lamp lights up when light no longer...
3-stage amplifier (CB23710E)
This low voltage circuit was found in the November 1960 Radio Electronics magazine announcing new...