3rd Rail TAS/RS to ERR Sound Conversion

If you're seeing the switch change states, I can't imagine it's switching too fast for the chuff not to work.  The disk magnet would probably trigger it twice each wheel rev.

I haven’t reversed engineered the TAS board but would think the hall device may not be directly connected to the R2LC pin 17. If so have you connected the reed switch between Pin 17 and Pins 3/4 as required?

Pete

@Norton posted:

I haven’t reversed engineered the TAS board but would think the hall device may not be directly connected to the R2LC pin 17. If so have you connected the reed switch between Pin 17 and Pins 3/4 as required?

Pete

Pete, the TAS mobo and Lionel RS boards were removed, replaced by ERR Cruise Commander and ERR Daylight Sounds.  Per ERR instructions, the reed switch is connected to the Commander, not the Sounds board.  Steering diodes isolate the smoke fan and Commander "chuff inputs" from each other.

Maybe trying disconnecting the diodes to the smoke fan. Contact closure should be all you need to generate chuff.

Pete

I think Pete may be onto something, if you're grounding pin-17, you should be getting chuff.  If you have the diode the wrong polarity, it won't pull the chuff to ground and generate the chuff.  Perhaps a diagram of how you wired the steering diodes?

@gunrunnerjohn posted:

I think Pete may be onto something, if you're grounding pin-17, you should be getting chuff.  If you have the diode the wrong polarity, it won't pull the chuff to ground and generate the chuff.  Perhaps a diagram of how you wired the steering diodes?

Both diodes' cathodes are connected to the reed switch, the other side of which is connected to common.  One anode connects to the chuff pin of the 3rd Rail smoke unit, the other anode connects to the chuff input (X2) of the Cruise Commander card.

Did you try disconnecting the smoke fan?  If it's still not working, did you bypass the diode between the chuff switch and pin-17 on the R2LC?  I've wired countless chuff switches to pin-17 of the R2LC, and it's always resulted in chuffing.