We found this circuit in a 1965 General Electric manual. The components are from the period. Time resistors and capacitors can be changed.
We found this circuit in an old operational amplifier manual. The operational amplifier can be of...
This receiver we found in a 1992 documentation operates in the 27 MHz band, triggering a relay...
This amplifier is from a commercial product from the 1970s. The circuit uses germanium transistors and...