Retired Oik (IBT)
- 27 Oct 2009
Does anyone have experience of setting up the chuff triggers on this loco - it looks a bit complex
Ah, and that, I think is part of the answer.Early Bachmann 'triggers' were a springy strip, pressing on an enlarged plastic section on the axle. - Purely mechanical, and suffered from chronic 'switch bounce'.. YOu either had to build electronics to de-bounce the signal, or suffer with syncopated chuffing!
Yep, thanks.I thought the chuff trigger was a connection on the board, should be a normal negative going trigger, hook right to your sound card.
What card are you using?
The chuff adjustor is a small piece of plastic with a "flag" sticking up that interrupts the optical sensor beam, it rides back and forth in the cylinders.
You can fine tune it to come out exactly when you want, normally not needed.
here's the pin connections: https://www.bachmanntrains.com/home-usa/dwg/dwgs/LS_C-19.pin_assignment.pdf
Not difficult at all.. you want pin J1-5
You go here to get the documents you want: Bachmann Trains Online - Contact Us
Just scroll down to the Large Scale section, and you will see several C-19 documents.
Thread drift warning ! Having travelled behind the 3 cylinder 4-6-0 locomotive "Leander" - over Shap to Carlisle and then from there over the Settle line - I am familiar with its unusual (if you are used to 2 & 4 cylinders) "waltz time" exhaust beat as I understand the cranks are disposed at 120 degree intervals. The same is evident when observing the bottom end of a Shay engine. So, I suppose 3 magnets arranged in the form of an equilateral triangle on a wheel should at least replicate the beat.......if nothing else MaxHe was well informed to not want to use the Shay triggers, they are a pain, and usually do not stay working without periodic adjustment. That said, I would use them to get the prototypical timing and the fact that they were 3 cylinders, right?
As it happens I'm currently working on fitting sound to a Bachmann three truck Shay. I can't find any reference to sound triggers on my example. Mind you, it's purely academic as I'm using an ESU decoder. In the past, on conventional steam outline models, I've been happy with their synchronisation adjustment without the use of external sensing.He was well informed to not want to use the Shay triggers, they are a pain, and usually do not stay working without periodic adjustment. That said, I would use them to get the prototypical timing and the fact that they were 3 cylinders, right?
Greg, the sound board is the basic Annie sound board with George Schreyer's enhancements.I forgot to re-affirm you have to power the main board, which powers the circuitry for the optical chuff triggers.
You need to take the chuff connection on the tender board to your chuff trigger input on whatever you are using... it will pull to ground when it "wants" a chuff.
3 wires to the bachmann board, power, ground and the chuff trigger wire to your sound board.
p.s. you never replied what sound card you are trying to hook to.