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Agreed, Williams 6A reverse board- note a version without reverse lockout switch.

The sound card either is a Williams True Blast II or a copy of one. I think they added the MTH style connector for speaker to possibly connect to an existing MTH speaker.

This is the first version of the Tru-blast 2.  Subsequent versions used a die instead of an IC.  It was built by Techno-mind of China for TAS, who was the designer of the board.

Lou N

I diagram is wishful thinking.  OTOH, there are diagrams for reverse units, one really detailed one was posted here several years back.  I was quite impressed with the high level of the technical writing, it's worth another look.

This guy reverse engineered the Lionel reverse board and documented it to a T.

Lionel E-Unit 00-0103-00 Theory Of Operation.pdf

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The reverse board, I'm not sure of the exact version but this should be valid for what the sockets are meant for.

Then this opic has a whole bunch of attached PDFs in replies https://ogrforum.ogaugerr.com/...everse-unit-question and specifically @Moonman posted these

Yellow and Purple are motor wires. Red and Black in the 4 pin plug are pickup and ground.

The 2 pin plug is power and ground for the sound board.

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Images (2)
  • mceclip0
  • mceclip1

Well Lou, I figured someone has the diagrams.   I was referring to something that can be publicly shared.  OTOH, given the inexpensive nature of these boards nowadays, I'm not sure about the real need of trying to repair them.

Hey John.  Nothing to see here.  DC offset detectors, 7805 regulator, and a custom chip.  Nothing that you haven't shown here before.  I think this sound chip had an integral audio amp.  Sometimes they do.

Lou N

@Lou N posted:

  I think this sound chip had an integral audio amp.  Sometimes they do.

Lou N

Nope, LM386 on the backside of the board (surface mount version of the LM386).

FWIW, K-line, Williams, maybe others, oh yeah, and drumroll- Aristo-craft all used those sound chips that I have put hands on.

Elan EM57P300CPS audio chip one time programmable.

Passive circuit component Circuit component Hardware programmer Electrical wiring Resistor

And yes, you can swap them to try different sound sets depending on who and what was programmed into them.

Example in that aristo-craft live steam swap with a Williams steam chip

https://www.youtube.com/watch?v=fvoTI2W4gdk

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Nope, LM386 on the backside of the board (surface mount version of the LM386).

FWIW, K-line, Williams, maybe others, oh yeah, and drumroll- Aristo-craft all used those sound chips that I have put hands on.

Elan EM57P300CPS audio chip one time programmable.

And yes, you can swap them to try different sound sets depending on who and what was programmed into them.

Example in that aristo-craft live steam swap with a Williams steam chip

https://www.youtube.com/watch?v=fvoTI2W4gdk

Very interesting.  I did not know that K-line and Aristo used Elan.  The Williams stuff I did know about because of TBII.  The later TBII used a downgraded copy of my circuit and maybe that's where you see the Elan chip (Sanda Kan copied my circuit).  I used the Elan IC in the first pass before using glob top die.  I did not use the IC you specified (57P300). 

Atlas had a sample from Elan for their trainman series but had BK and me design that circuit for them. 

Additionally I will note that Elan's OTP had a programming failure rate of 50%.

I mentioned previously Techno-Mind.  Their president Ken Tong came in one day and emptied the bank accounts and was never seen again.

Probably more than you wanted to know.

Lou N

@Lou N posted:
Probably more than you wanted to know.

Lou N

Lou, I greatly appreciate the history. That's the part I'm missing, I came back into the hobby December 2017. So while I've tried to catch up to all the wild happenings, I just simply wasn't living it real time like many of you were. I graduated HS in 1994 and 6 days later was in basic training, then shipped off to Germany for 7+ years (with lots of time in other places). So I missed out on the rise of TMCC, Railsounds, the rise and fall of the companies and so forth.

Again, thanks for sharing.

Lou, I greatly appreciate the history. That's the part I'm missing, I came back into the hobby December 2017. So while I've tried to catch up to all the wild happenings, I just simply wasn't living it real time like many of you were. I graduated HS in 1994 and 6 days later was in basic training, then shipped off to Germany for 7+ years (with lots of time in other places). So I missed out on the rise of TMCC, Railsounds, the rise and fall of the companies and so forth.

Again, thanks for sharing.

Hi Vernon,

If you have any further questions let me know.  I may still have some unprogrammed Elan ICs.  Not sure if the programmer/emulator still works.

On the up side, you missed out on all the crazy lawsuits.

Lou N

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