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This is a bit of a follow up to: https://ogrforum.ogaugerr.com/...c/170922644673689785 but may also be of help separately.  I ended up looking to replace just the sound for a 1996 Railking GG1 that does not have the Protosounds board, just the horn sound.

I have an old used ERR Railsounds board that I am going to use to upgrade the sound only (I am using this set as conventional). 

So far I removed the speaker to replace with the new speaker.  I can always just wire in the new board and be done but was thinking what existing boards can be removed?  Could someone offer any advices as to which if any are able to go...I see the top one is connected to the speaker and guess one is a reversing unit, maybe #3?  Originally thought there would be 2 total boards, sound and reversing, but the 3 has me confused?

Thanks in advance!!!



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@Dd289 posted:

Got it off.  Last questions out of curiosity......

-Would a PS1 board have plugged into the expanded pins where the sound board was or would that require a whole new DCRU that works for PS1?

-I assume this is where the "accepts plugin protosounds" would have gone.  What was the pre-PS1 board called?

Requires the PS1 style DCRU. That plain one is missing key voltage regulators- the battery connector required for PS1.

https://ogrforum.ogaugerr.com/...om-board-vs-qsi-dcru

FWIW, just before Christmas, a local customer brought in a collection of MTH engines for inspection and servicing before he was going to turn them over to family. That was the first and only time (started this hobby Dec 2017) ever I saw the pre-PS1 QSI 3 board stack, and because it was still QSI, the instructions for settings is very different than PS1- example resets and so forth.

Again, I can say I have touched a 3 board stack QSI, ran it for a bit, and gave back to the customer (serviced it, new traction tires, lube, and smoke unit re-wick).

Finding those QSI parts- might require someone with a larger parts stash than I have.

Board (3) has the (4) diodes, parts for the bridge rectifier, (changes AC to DC).  The large capacitors, Board (1) could, (also) be part of the AC/DC conversion. Horn circuits, and electro-coupler circuits, could also have capacitors.   Capacitors tended to help eliminate a lot of model train chatter, generated by arc, and spark, at the rails. IMO, Mike CT. 

Edit Add:  QSI still in the model train business, there is a website. 

Last edited by Mike CT

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