Fourth-Order High Pass Filter 741 (CB25597E)

This 100 Hz filter was found in the August 1993 issue of Electronics Now. The components can be modified to operate at other frequencies.

| Clique na imagem para ampliar |

Inverter with AC Output (CB12171E)
We found this inverter in a Popular Electronics from the 1980s. The output is not perfectly...
Low drift voltmeter (CB7910E)
Found in American documentation from the 90s, this circuit uses common FETs. It has a range drift...
Light Controlled Oscillator with the 555 (CB12104E)
The frequency of the sound produced in the speaker depends on the light that falls on the...