Originally Posted by 300SD81

After reading the thread on the new tach amp, I thought I might give making a modernized cruise amp a try... How much interest is out there if this works out? Based on the wiring diagram, it seems to be a pretty simple job with a microcontroller, with almost everything done in software.

Pin 1, 12 - Power/Ground:
Step down to 5v for microcontroller

Pins 3,6,2,4,8 - Control inputs and Disengage:
step down to 5v and feed into input change pins on microcontroller

Pin 11 - Speed input:
Input pin on controller, type depending on signaling method

Pin 5 - Release clutch control output:
standard output pin + transistor or relay

Pins 7,10 - Motor control outputs:
PWM output to H-bridge

Pins 9,13 - Feedback input:
5v on one pin, other input to ADC

I'll work out a basic circuit tomorrow after some testing for signaling methods, voltages and resistances. I'd estimate approx 25-50 components, and if theres interest, I'll offer a kit or preassembled, but you'll have to be able to solder SMT components if you get the kit, I've given up drilling holes in my PCBs a long time ago...