Found in American documentation from the 90s, this circuit can be used as a shield with the replacement of the output optical coupler. The operational also admits equivalent.
This circuit is suggested by National Semiconductor and is based on a double operational amplifier of...
This electronic roulette circuit with 10 numbers was found in a Popular Electronics from the 80s....
For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The...