Difference Amplifier OP37 (CB19724E)

Raytheon's used operational amplifier is rare today, but the configuration can be adapted to use modern operational amplifiers.

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Thermostat (CB25467E)
We found this circuit in the June 1992 issue of Radio Electronics magazine. The sensor is a common...
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This circuit converts a positive CMOS supply voltage to a negative one. We found it in a 90s...
Baxandall with CA3140 (CB11981E)
This tone control was obtained from the CA3140 datasheet, originally created by RCA. The CA3140...