Include

[Larry S.]

Do you have a schematic on your 10k version?

Jim,
Yes I do. Send a PM to me with your email address and I'll send a schematic.

FWIW: I looked at using diodes when first working with asmith, the originator of the 10k mod, but felt it didn't give me enough control of the turn on point. Your three diodes turn on between 1.5 and 1.8 volts, which is OK, but the shunting current of the added resistor is produced from the ICP viltage minus the diode drop which means the effective resistance is higher than the actual resistor value. That doesn't mean the diode method does not work. It just is more non linear than a switching method. With my transistor scheme I use a divider and the diode drop of the base emitter junction to set the turn on voltage. When the voltage reaches the turn on point the transistor begins to turn on and soon saturates which connects a resistor in parallel with the ICP output. I use a fixed resistor and a pot in the collector of the transistor to facilitate having a variable amount of shunting resistance. I also use a small resistance in the transistor's emitter to soften the switch characteristic which makes the transition very smooth. My prototypes had pots to control turn on voltage, shunt resistance, and turn on softening but after much trial I settled on a fixed turn on and softening value and only kept the shunt resistance pot. I also have a switch to turn the circuit "off". I tried selling these things and have a few satisfied customers but decided it wasn't worth the time and work to continue selling them. I still have enough parts to build a couple more but have no interest in building any. My eyesite is getting so bad I have difficulty soldering the board. I'll send a picture of a unit in my truck and the instruction packet I included with my units along with the schematic. It should work good with your split shot Cali truck.