However, it requires adding in a Arduino or similar that can speak I2C, a DPDT relay, and some supporting components. The I2C lines between the stereo’s microcontroller and the TEA688OH signal ...

It’s got more click and clack than the Tappet family, and is a work of art rendered in DPDT relays. The biggest consideration in designing a relay computer is the memory. You can implement a CPU ...

When voltage is applied to the coil then the relay switches and now T1 (plus ... In this second application we can use the DPDT switch to choose between 2 different load and have a visual indication ...