This circuit was obtained from a Linear Technology manual from the 90's. The integrated circuits are from the time and could possibly be tested as modern equivalents.
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,...