Filament source (T398E)

Despite being transistorized, this is a constant current source circuit for 1 V valve filaments such as the 1H4 tube.

Current Monitor (CB15532E)
Obtaining a voltage that is proportional to a current drained by a load can be important in...
High Pass Filter LM102 (CB15473E)
The filter shown in the figure, suggested by National Semiconductor, only allows frequencies above...
Diode match circuit (CB7379E)
This circuit allows you to find two diodes with equal characteristics. The circuit was found in a...