This circuit with RIAA equalization is from 1985 US documentation. The circuit has a flat response of 150 Hz to 40 kHz. The power supply must be symmetrical.
We show an oscillator that produces rectangular TTL signals based on inverters. Inverters can also be...
I got this circuit from a magazine in 1967. The magazine no longer exists, but the circuit that...
This egg timer has been found in an English magazine that no longer exists in 1982. The...