This circuit was obtained in a 1970 engineering documentation. The operational is the 741, but other operational ones can be used. The power supply must be symmetrical.
We found this circuit in the National Semiconductor's Linear Applications Handbook of 1994. The...
This circuit activates a relay that has a lamp as a load. The circuit is from a Radio Electronics from...
This experimental 555 circuit sends signals in the medium wave band to a receiver a few meters away....