We found this parallel regulator in a 1973 publication. Transistors admit equivalents and the output voltage can be modified by changing the zener.
This circuit was obtained in a publication for radio amateurs of 1977. It is used to reduce the...
This circuit found in a 1974 English magazine was originally designed to automatically trigger a slide...
In the figures we have an infrared transmitter with a BC337 switching transistor that must be...