This circuit decodes a 1800 Hz tone used in communications. The circuit is from an American documentation for radio amateurs of the 80's. Equivalent component can be used.
The operational amplifier is not very common today, but in its place an equivalent, even of...
We found this circuit in a documentation from 1966. The transformer is output for transistors. Resistors...
This circuit in the National Semiconductor Fast IC Power Transistor manual uses a special power...