We found this circuit in an old American documentation. The operational amplifier is from the time and the output used to control an SCR or other power control.
Found in a documentation from the 90's, this circuit uses only one integrated circuit. The...
We found this third-order Butterworth asymmetric filter in an old manufacturer documentation. The...
In the figure we show how to use an LM324 as a voltage comparator the reference voltage is...