This circuit was found in an English publication from the 70s, an article that teaches how to calculate instruments. The circuit is still current and can be built with an analog indicator of 100 uA.
This circuit is from a 90s Popular Electronics. The circuit employs a ZN461E that is not a common...
September 2017 - Microchip 32-bit PIC32MX series microcontrollers are available from Mouser...
This flip-flop using two bipolar transistor was found in a publication of the year 1968. The...