Found in an Electronics World of 1966 this circuit can be made with current power transistors. It causes colored lamps to flash to the rhythm of the audio signal applied to the input.
The circuit shown has a maximum output current of 1.5 A. We find this traditional configuration in the Linear...
We found this circuit in a 1977 National Semiconductor Databook. The circuit can use other FETs...
This decoder filter was found in a 1975 documentation. The integrated circuits can be 741. The...