This very low power circuit is based on the ICL7860. We found it in an Electronics Now from April 1995. The output current is very low.
We found this inverter in a Popular Electronics from the 1980s. The output is not perfectly...
Found in American documentation from the 90s, this circuit uses common FETs. It has a range drift...
The frequency of the sound produced in the speaker depends on the light that falls on the...