This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
July 2016 - It can be obtained from Mouser Electronics new trinkets Adafruit. These trinkets are...
The purpose of this circuit is to extend the range of frequency meters (typically up to 30 MHz) to...
November 2016 - Super capacitors from 1 F to 3 500 F from AVX can now be purchased from Mouser...