Found in a 1970s documentation, this mini-organ toy circuit makes use of an integrated circuit from that time. This component is difficult to obtain today.
The circuit that gave rise to this configuration is from 1978. In the original publication are...
Found ina 1970 American documentation this fast-reading circuit uses a photodiode. Transistors...
Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz....