This circuit produces sounds of 6 different notes depending on the keys activated. The circuit is from a Radio Electronics from May 1965. The transistor must be equipped with a heat radiator.
This circuit is from an American documentation from 1954 and is indicated for use in toys with a...
In figure 1 we have an application for NLAS5113, a new device from On Semiconductor...
This circuit lets through the 300 Hz to 3kHz range that corresponds to the human voice. We found it...