This circuit was found in Electronics Today International of the 80's. The circuit uses still common components, providing the indication through LEDs.
This circuit is from the time when photos were revealed in darkrooms. We found it in a 1968...
This is a commercial circuit that can be found in several publications from the 80s and 90s and...
April 2017 - Mouser Electronics already has in stock the new HMC8400, Analog Devices low noise...