This FM receiver tuning step circuit was found in a 1960 documentation. No information about the coils is given, but the FI used at the time was 10.8 MHz.
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...