Found in American documentation from the 90s, this circuit can measure frequencies on a linear scale from 0 to 1 kHz. The components can be changed to measure other ranges.
This circuit can act as a shield being controlled by a microcontroller by pin 1 or 2. The...
May 2017 - Mouser Electronics announces the availability of new Toshiba SSM6K N Channel MOSFETs...
This circuit is from a 1987 magazine, but it can still be easily assembled, as the components are...