Posted in classic hacks, hardware, Musical Hacks Tagged arduino, Casio SK-1, circuit bending, NEC 23C256, rom ← Repairs You Can Print: A Little Love For The Glove Box ...

An improved circuit with an optocoupler type TLP621 is shown in Figure 2. Figure 2 A circuit with an optocoupler (TLP621) which generates higher (even) harmonics that can be added to the original ...

The circuit in Figure 1 provides a low-cost, isolated ac-line monitor that measures ac-line-voltage level and has some other unique capabilities. The analysis of the circuit is straightforward: When ...