In a spellbinding discovery, a French-Swiss team archaeological team in Egypt has uncovered the tomb of a multi-talented wizard-doctor who served the pharaohs approximately 4,000 years ago.

The synth relies on two 555 timer ICs as the oscillators and an LM741 op-amp. These parts harken right back to the dawn of the integrated circuit era, and still do a great job in this application.

The basic switch is then extended with an electrolytic capacitor to make a simple time delay switch, and finally we’re shown how two such circuits combine to make an astable multivibrator and ...