Receiver for the 40m band LM602 (CB25305E)

This circuit uses an FM IF transformer for tuning. The circuit is from a Radio Electronics magazine from April 1990.

Sine to Square Converter (CB6592E)
Found in a 1964 Electronic Design this circuit makes use of components of the era. The output is 2 V...
Square Oscillator (CB4847E)
The LM2904 is not very common today, but common comparators and operationals can be used in the...
Opto Receiver using FET (CB1552E)
This stage is intended to receive modulated optical signals, using as a receiver a photodiode....