This high-precision circuit was found in documentation from the 1990s. The integrated circuit is an LM111 or another in the series. The circuit has TTL output and can function as a shield.
This simple transistorized radio was found in a Japanese magazine from 1960. The phone must be...
This circuit counts from 1 to 10 or 0 to 9 using as indicators common LEDs. The circuit can be...
Found on Popular Electronics from 1969, this circuit can be implemented with components that are...