This simple 6 V source stabilized by zener diode was found in a European technical publication from 1972, but it is current for its simplicity and the components it uses.
Published in an old Popular Electronics, this circuit makes use of components that are still...
This modulator circuit for transmitters was found in American documentation from 1964. It can be...
This circuit for frequencies from 1Hz to 100 kHz was found in the June 972 Radio Electronics...