This is the receiver for the previous circuit, also found in 90s Radio Electronics. The circuit operates at 2.25 MHz, detecting variations in signal frequency due to the Doppler effect.
This circuit, found in a 1991 documentation, doubles the frequency of a TTL signal. The maximum...
The purpose of this circuit is to interface a TTL system with a TRIAC controlling a power load...
Found in an English Maplin magazine in 1983, this circuit has an RIAA equalization. We suggest its...