Norton posted:Jim Harrington posted:So what would be the correct way to wire this, and have synchronized chuffing and puffing?
Thanks
There are actually many correct ways to do this. One adds to GRJ's retirement account the other adds to your retirement fund by the money you have saved. The smoke unit you selected with the 5V regulator for the fan you could have rewired it to drive a simple DPST relay. Connect your chuff switch to one side of the relay coil, connect the other side of the relay coil to the 5V regulator output. Using one pair of relay contacts connect one to common and its mate to motor ground after removing the trace that grounds the motor. The relay will now be closing the motor circuit instead of the PC board ground.
Now connect the other relay contacts pair, one to common (pin 3-4 R2LC) and the other to pin 17 on the R2LC (chuff input). You now have perfectly synch puff and chuff. Reed relays are about 8 bucks.
The least elegant way is to use two reed switches, one for fan and the other for chuff. You still need a regulated 5V for the fan but that would have been available on that particular smoke unit.
A third way involves a pair of transistors to isolate chuff input from fan drive. again a few bucks in parts.
Pete
The results with the Super-Chuffer are great, and I would highly recommend it,in concert with the Chuff-Generator.
That said, my next planned upgrade is really tight; not sure if that solution will fit. If it won't I would like try one of the options you suggested. Can you advise on a model/part number for the suggested relay option, as well as for the transistors and resistors in the schematic?
Thanks,
-Jim
