This circuit was found in the February 1983 issue of Radio Electronics magazine. It is a 4-digit circuit with dedicated integrated circuits, with no power supply indicated.
This circuit for a maximum current of 1 A is the most common version that uses the 78 and 7905...
This circuit was found in a 90s Popular Electronics. It can generate signals from 3 to 10 MHz....
This circuit has a very high input resistance to excite a 0-1 mA indicator instrument. The FET...