Medium wave range booster (CB21677E)

This circuit is from a 1960 book by Hugo Gernsback. The transistors are germanium from the time.

Simple blinker (CB6759E)
P1 on this Radio Shack circuit is a 6 V lamp with current up to 500 mA depending on Q2. The...
Touch Alarm (CB17032E)
This simple touch alarm, found in a 1995 documentation, uses common components and a triac to...
Micro Voltage Regulator (CB1577E )
With the micro voltage regulator shown in the figure, we can design a power supply for small...