This circuit was found in a 90s Popular Electronics. The circuit operates in the range determined by L1. The integrated circuit used is uncommon today.
This mixer with 20 dB gain per channel uses RCA's CA3048 integrated circuits. We found it in the...
We found this simple circuit in December 1975 Radio Electronics magazine. The integrated circuit is...
This touch-controlled circuit was found in English documentation from the 1970s. The components...