This tone control was obtained in the Audio Handbook of the National Semiconductor of 1977. The circuit controls the signals of medium frequencies in a wide dynamic range as shown in the diagram.
On this 1960s circuit, stations are pre-tuned in trimmers and then selected by a switch. The...
This small shaver bender circuit makes it possible to use 220/240 V shavers on 110 V networks. The...
The operational amplifier used in this application is not the most common today. The circuit is...