This circuit has a frequency range of 30 Hz to 100 kHz with an output signal of 1 Vrms. We found it in 70s American documentation. The integrated circuits are CA3140.
This touch switch has a bistable action and powers an LED. The circuit can be changed to control a...
This filter was found in Texas Instruments documentation from the 1980s. The circuit uses a common...
We found this circuit in the Linear Applications Handbook by National Semiconductor. The circuit is...