100 V x 5 mA Voltage Regulator (CB835E)

This high voltage regulator uses only two passive components. The output is 100 V, but replacing the zener diode other voltages can be obtained.

4 to 20 mA Interface (CB4815E)
This 4-20 mA current interface was found on a 90's EDN. The components used are not common today and...
Two Transistor Shield (MSB121E)
This circuit can be used to control loads up to 500 mA from the outputs of microcontrollers such...
Tuning Indicator (CB1468E)
This circuit was obtained in 1974. It serves to indicate the tuning of stations on a common...