This is the circuit of a modified Heathkit kit. The circuit was found in a Radio Electronics from December 1965. The author of the circuit included improvements to the original circuit.
Books and e-Books by Institute NCB 100 CIRCUITS - SHIELDS FOR ARDUINO FUN PROJECTS FOR THE...
The LM109 was manufactured by many semiconductor companies that presented different configurations in their...
This shield was found in an American documentation from the 70s. The operational amplifier is from...