6 V power supply with power zener (CB21531E)

This circuit provides 6.3V of output from a 9V input. The circuit was found in a Dutch publication from 1966.

100 kHz Oscillator (CB22378E)
This oscillator generates C1-dependent rectangular 100 kHz signals. The circuit requires symmetric...
Low Frequency Astable (CB470E)
The astable multivibrator shown by the figure can produce signals in the 10 to 10 000 Hz band...
Hybrid millivoltmeter (CB23546E)
We found this circuit in a Radio Electronics from December 1963. The circuit combines valves and...