Found in a 1948 MIT documentation, this circuit uses a 0 to 100 uA microammeter as an indicator. The power supply is 150 V.
This circuit is from a 1992 publication. The transistors can be the BC549 or BC548 and the power...
This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The...
September 2016 - It can be obtained from Mouser Electronics the new inductors for power supply of...