True RMS Voltmeter (CB25353E)

This circuit is from a Radio Electronics magazine from August 1990. The indicator module is of a common type at the time.

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Hand Dryer (CB17272E)
This circuit activates a machine to dry hands (fan and heater) when the sensor detects the...
Difference Amplifier MC1439 (CB19672E)
The operational used is like the 741. The circuit is from the datasheet and the formula that...
1500 Hz Low Pass Filter (CB12564E)
The second order filter shown in the figure is suggested by Texas Instruments, based on the TL081...