This filter for the 300 Hz to 3 kHz range was found in an American documentation from the 90's. The operational amplifier is a double 741.
Found in RCA documentation from the 1960s, this 60 V regulator has a 100 V input and a current of 1...
Found in an 80's documentation this circuit uses an integrated from the uncommon era today. Other...
We found this circuit in an English publication from 1980. It provides a logical output signal when...