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 |

High Impedance Microphone Preamplifier (CB18257E)
This high-gain circuit uses junction FETs (JFETs) and must be powered by somewhat high voltages. The...
Binary Display 7400 (CB22436E)
This circuit counts 1 per second, displaying the value in binary. The circuit is TTL and must be...
Sensitive Geiger Detector (CB5925E)
Critical components of this project are the Geiger tube and the 300V battery. The battery can be...