This is a typical 3 ½ digit TTL counter. We found it in the September 1973 issue of Radio Electronics magazine. The circuit is to be powered by 5 V. It can be expanded to more digits.
This small receiver uses CK722 transistors and was found in a documentation by Hugo Gernsback from...
This simple photometer circuit uses an LDR as a sensor and the indicator is a sensitive...
In figure 1 we have an application for NLAS5113, a new device from On Semiconductor...