This configuration makes use of currently uncommon components. In fact, we found it in documentation from the 70s. Equivalent operational amplifiers can be used.
This circuit has visual and audible status indication using an oscillator. The circuit is from a...
Using the ICM7556, dual CMOS version of the 555, this circuit generates triangular signals from 1 to...
This circuit, which can be used as a shield, was found in Radio Electronics from the 90s. The...