This circuit, with printed circuit board, is from an article in Radio Electronics magazine from May 1971. The circuit uses the C106 which was already a common component at the time.
The 4511 is a 7-segment latch driver providing up to 25 mA in each output. The typical application using the...
This circuit is from the 1983 Intersil manual. The display is a 4.5-digit LCD, and the power...
Found in a Popular Electronics from the 90s, this circuit can act as a transmitter for an audio...