The LM121 integrated circuit is no longer common in our market, with more modern equivalent versions. The circuit is from the 1994 Linear Applications Handbook by National Semiconductor.
This high-gain circuit uses junction FETs (JFETs) and must be powered by somewhat high voltages. The...
This circuit counts 1 per second, displaying the value in binary. The circuit is TTL and must be...
Critical components of this project are the Geiger tube and the 300V battery. The battery can be...