Simple timer (CB23641E)

For times in the range of seconds to a few minutes we found this timer with the CK722 in a Radio Electronics magazine from September 1959.

Two frequency oscillator (CB8059E)
Found elsewhere in this section, but from other sources, this circuit is from a 1964 Electronic...
Active antenna (CB6771E)
This circuit for medium and short wave range was found in an American documentation from 1992. The...
Transformer less power supply (CB8896E)
The output voltages of this power source are selected by a switch according to the capacitors. The...