This circuit was found in documentation from the 1970s. However, it can be implemented with modern transistors such as 2N2222 for Q1 and BF494 for Q2. The crystal depends on the desired frequency.
With this circuit it is possible to obtain a voltage of 24 V using a 12 V regulator. The maximum...
We found this circuit in a 1965 publication by General Electric. The zener is 8.2 V x 1 W and the...
This circuit was found in a Hands On Electronics from the 90s. It turns on an LED to indicate that...