The DCCD controller cometh!

Of the many ways to install a DCCD controller in a car that's never had one before, the cheapest one involves a Velleman K8004 pulse width modulator. In simple terms, it takes a voltage signal and converts it to a constant voltage signal with varying pulse length.

The one that was in the car was in rough shape, so I picked up a fresh kit and soldered it up. The DCCD needs a 100Hz, 12V max signal. I got out the oscilloscope and adjusted the K8004's pots to a 0V minimum, 12V maximum, and 100Hz cycle.



This sequence shows the differential signal going from wide open to full lock:


I'll do a clean wire job and life will be good!