CA3020 Signal Tracer (CB24209E)

Found in a September 1972 Radio Electronics magazine, this circuit uses RCA's CA3020, a multi-purpose amplifier in a round metal 12-pin package.

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Integrator LS141 (CB15192E)
This circuit is from the 1982 SGS linear integrated circuit manual. The LS141 is like to the 741...
FSK Demodulator (CB15902E)
The integrated PLL XFl2211 (Exxar) is used to decode data transmitted by tones R1, C1, C2 and C3...
Double Touch Switch (CB16980E)
This bistable touch sensor circuit uses a relay and is very sensitive. We found it in a 1990...