This relay shield circuit for old computers was found in January 1983 Radio Electronics magazine. The relays are sensitive types with currents up to 200 mA.
Pressing S1 stops the circuit. This circuit was found in the October 1992 issue of Radio...
We found this third-order Butterworth asymmetric filter in an old manufacturer documentation. The...
We found this circuit in a 1998 documentation. L1 has 3 turns of wire 16 in the form of 8 mm...