This electronic Morse key was found in a Popular Electronics from the 90's. The components are common, but there is a mechanical part that requires assembly skills.
With this circuit it is possible to divide the frequency of a rectangular signal by values between 2...
This circuit was obtained from the Encyclopedia of Electronic Circuits volume 5 of 1995. The...
This circuit can supply output voltages from 50 to 250 V from an input voltage of 300 V. The...