This 1969 Electronics World power supply has 5 V to power digital circuits and a 170 V output for Numitron indicator valves used at the time.
We found this circuit in documentation from the 90s. It is a common configuration that is given in two...
This circuit uses a complementary unijunction transistor that is not the common type. The...
Found in old American documentation, this circuit is current as it uses the 555 to modulate an...