Neon Voltmeter (CB13643E)

This circuit was found in a 1974 publication. It consists of a voltmeter for high voltages, up to more than 100 V, using a neon lamp.

| Clique na imagem para ampliar |

5 mA Constant Current Source (CB25615E)
This constant current circuit was found in the October 1993 Electronics Now magazine. The current can...
Tone Control (CB19236E)
This circuit is from a 1972 Motorola publication. The used transistor can still be found, but it...
Voltage Controlled Current Source (CB910E)
The output current for this source depends on the voltage applied to the input. The operational...