This filter was found in an old publication from 1977. The circuit must use a simple two-voltage source and the components can be changed for operation at other frequencies.
This circuit was found in Maxim's documentation from the 80's. The integrated circuit is from that...
This circuit generates a sinusoidal signal with only -80 dB THD. The circuit was found in a 90's...
We found this sensitive moisture detector in an old documentation. The circuit uses a common JFET,...