Deckards Dream General Build Thread

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steviet
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Re: Deckards Dream General Build Thread

Post by steviet » Thu Jul 09, 2020 9:54 am

I'm going to back taking the plunge on a REV2.1 board pretty soon...

I'm doing my parts sourcing, and I cannot find the DC/DC converter S24DE12001PDFA absolutely anywhere for the life of me.

Does anyone have a spare they want to sell a fellow wiggler? Or have a source that I can buy one from? I've inquired at a few shops but none have got back to me.
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Re: Deckards Dream General Build Thread

Post by bsilverberg » Thu Jul 09, 2020 11:36 am

I used the TDK-Lambda CCG302412D. You just have to tie the RC leg to Neg-In/COM in order to set it to active.

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search64
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Re: Deckards Dream General Build Thread

Post by search64 » Thu Jul 09, 2020 11:49 am

JanneI wrote:
Thu Jul 09, 2020 9:43 am
search64 wrote:
Thu Jul 09, 2020 7:16 am
Just here to complain about the friggin voice cards. I've only done three resistor values and its taking forever...
I did all 8 cards at the same time and the resistors only took me one day ;-)
It’s just that I don’t have a lot of connected time, just lots of hours here and there. Oh well, I’ll get there.

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Re: Deckards Dream General Build Thread

Post by steviet » Thu Jul 09, 2020 12:54 pm

bsilverberg wrote:
Thu Jul 09, 2020 11:36 am
I used the TDK-Lambda CCG302412D. You just have to tie the RC leg to Neg-In/COM in order to set it to active.
Thanks for the tip! I'm going to grab one of these now!
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Blue Meanie
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Re: Deckards Dream General Build Thread

Post by Blue Meanie » Sun Jul 12, 2020 4:18 pm

Building rev1 and noticed that in the output board schematic C3's polarity is reversed. The rev 1.1.0 BOM calls for 15uF, but again the schematic shows 100uF. I looked through the thread and didn't see anyone else bring it up, so I thought I would ask. Did anyone else come across this during their build?
Last edited by Blue Meanie on Sun Jul 12, 2020 9:57 pm, edited 1 time in total.

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Re: Deckards Dream General Build Thread

Post by sduck » Sun Jul 12, 2020 8:54 pm

Are you sure about that reversed polarity cap? It's been a long time since I built mine, so don't remember for sure. In general the best resource is here - https://www.dsl-man.de/display/DDRM/DDRM+Home - or the facebook build group
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Re: Deckards Dream General Build Thread

Post by Blue Meanie » Sun Jul 12, 2020 9:48 pm

It's reversed;

C3 output board.png
C3 plus to GND.jpg

Thanks for the info, I checked that site before I started organizing all the parts. Oh, I haven't been on Facebook yet, but it sounds like a good idea.
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Re: Deckards Dream General Build Thread

Post by LED-man » Mon Jul 13, 2020 2:10 am

Please don’t use ESD bags for isolation while you measure or have pcbs under power.
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Re: Deckards Dream General Build Thread

Post by Blue Meanie » Mon Jul 13, 2020 8:19 am

Thanks, but it doesn't matter in this case.

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Re: Deckards Dream General Build Thread

Post by gadgadasvara » Fri Jul 17, 2020 12:29 am

just want to share that i recently finished my rev2.1 build, using AS3340 IC, that turns out require some resistor changes on the voice board to make it work. unfortunately this hasn't been documented anywhere, so i thought i'm gonna share it here for those who want to save money and use the alfa chips.
i got this information from Don Samogon on fb group.

resistor changes on voice board rev 2.1 :
R6 & R100 : should be 390K
R41 & R135 : should be 560R
R22 & R116 : should be 51K

i've spent months troubleshooting my built with no result (almost desperate to be honest), thinking that it doesn't need any resistor changes on rev2.1. luckily Don Samogon showed up with this valuable information, now my DDRM working nicely.

cheers.

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Re: Deckards Dream General Build Thread

Post by JanneI » Fri Jul 17, 2020 2:07 am

gadgadasvara wrote:
Fri Jul 17, 2020 12:29 am
just want to share that i recently finished my rev2.1 build, using AS3340 IC, that turns out require some resistor changes on the voice board to make it work. unfortunately this hasn't been documented anywhere, so i thought i'm gonna share it here for those who want to save money and use the alfa chips.
i got this information from Don Samogon on fb group.

resistor changes on voice board rev 2.1 :
R6 & R100 : should be 390K
R41 & R135 : should be 560R
R22 & R116 : should be 51K

i've spent months troubleshooting my built with no result (almost desperate to be honest), thinking that it doesn't need any resistor changes on rev2.1. luckily Don Samogon showed up with this valuable information, now my DDRM working nicely.

cheers.
Unfortunately there's no official build guide/etc, but Patrick's site had this already: https://www.dsl-man.de/display/DDRM/DDRM+rev.1+guide

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Re: Deckards Dream General Build Thread

Post by gadgadasvara » Fri Jul 17, 2020 4:17 am

JanneI wrote:
Fri Jul 17, 2020 2:07 am
Unfortunately there's no official build guide/etc, but Patrick's site had this already: https://www.dsl-man.de/display/DDRM/DDRM+rev.1+guide
i believe that’s for rev1 boards on Patrick’s site. i asked Patrick before about resistor changes in rev 2.1 boards (it’s here somewhere in the previous post), he then asked Roman, and Roman said no need changes. but then my DDRM didn’t worked until i did those changes.

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Re: Deckards Dream General Build Thread

Post by LED-man » Fri Jul 17, 2020 6:22 am

The resistor changes was discussed on Facebook 2 years ago for the DDRM rev.1 and this was needed to get the correct frequency range (when I remember me correctly)
But I don’t have an info about rev.2 DDRM.
In the kijimi the As3340 works as direct replacement.
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Re: Deckards Dream General Build Thread

Post by Pando » Sun Jul 19, 2020 1:16 pm

Blue Meanie wrote:
Sun Jul 12, 2020 9:48 pm
It's reversed;


C3 output board.png


C3 plus to GND.jpg


Thanks for the info, I checked that site before I started organizing all the parts. Oh, I haven't been on Facebook yet, but it sounds like a good idea.
It's amazing how I've looked at that schematic so many times and never noticed it until now. Yep, it's as plain as it can be, C3 is reversed.

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Re: Deckards Dream General Build Thread

Post by Pando » Sun Jul 19, 2020 1:30 pm

Blue Meanie wrote:
Sun Jul 12, 2020 4:18 pm
Building rev1 and noticed that in the output board schematic C3's polarity is reversed. The rev 1.1.0 BOM calls for 15uF, but again the schematic shows 100uF. I looked through the thread and didn't see anyone else bring it up, so I thought I would ask. Did anyone else come across this during their build?
C3 is there to filter a dedicated +5V (+5V2) supply for the fan only. Yes, it's reversed (and shouldn't be), but if you use TL062s on the voice cards, you don't need the fan, so you don't even have to use that part.

That said, having a reversed cap there isn't a good idea, with or without the fan. It may break down and short eventually. So I'd correct the polarity or remove it.

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Re: Deckards Dream General Build Thread

Post by LED-man » Sun Jul 19, 2020 2:18 pm

This affects Rev1 and rev2 ?
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Re: Deckards Dream General Build Thread

Post by Pando » Mon Jul 20, 2020 12:20 am

LED-man wrote:
Sun Jul 19, 2020 2:18 pm
This affects Rev1 and rev2 ?
Most likely Rev1 only, as Rev2 doesn't have a fan. Then again, the BOM still has this, so what's it doing there is anyone's guess. I haven't seen the Rev2 schematic.

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Re: Deckards Dream General Build Thread

Post by Blue Meanie » Mon Jul 20, 2020 2:25 pm

Pando wrote:
Sun Jul 19, 2020 1:30 pm
Blue Meanie wrote:
Sun Jul 12, 2020 4:18 pm
Building rev1 and noticed that in the output board schematic C3's polarity is reversed. The rev 1.1.0 BOM calls for 15uF, but again the schematic shows 100uF. I looked through the thread and didn't see anyone else bring it up, so I thought I would ask. Did anyone else come across this during their build?
C3 is there to filter a dedicated +5V (+5V2) supply for the fan only.
+5V2 also feeds IC2, which is for the USB power out. C3 helps filter low-frequency noise in conjunction with C2 for high-frequency. I would leave the 15uF capacitor populated but correct the polarity.

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Re: Deckards Dream General Build Thread

Post by makers » Mon Jul 20, 2020 2:47 pm

The schematics for the breakout board show C3 as 100uF. What's the consensus on the correct value for C3? Is it possible the problem of reversed polarity was the result of a "copy and paste" of some kind and also introduced a wrong value into the BOM?

I recently bought a used Ver.1 where the fan will not turn off with software. I wonder if the reversed polarity of C3 is a related problem.

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Re: Deckards Dream General Build Thread

Post by Blue Meanie » Mon Jul 20, 2020 3:33 pm

makers wrote:
Mon Jul 20, 2020 2:47 pm
Is it possible the problem of reversed polarity was the result of a "copy and paste" of some kind and also introduced a wrong value into the BOM?
Probably copied and pasted from either C14 or C16 on the PSU schematic. I'm going to use the 15uF capacitor because there is already a 100uF capacitor filtering +5V2 on the PSU board, C11.
makers wrote:
Mon Jul 20, 2020 2:47 pm
I recently bought a used Ver.1 where the fan will not turn off with software. I wonder if the reversed polarity of C3 is a related problem.
Possibly

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Re: Deckards Dream General Build Thread

Post by Pando » Tue Jul 21, 2020 3:25 pm

Blue Meanie wrote:
Mon Jul 20, 2020 2:25 pm
Pando wrote:
Sun Jul 19, 2020 1:30 pm
Blue Meanie wrote:
Sun Jul 12, 2020 4:18 pm
Building rev1 and noticed that in the output board schematic C3's polarity is reversed. The rev 1.1.0 BOM calls for 15uF, but again the schematic shows 100uF. I looked through the thread and didn't see anyone else bring it up, so I thought I would ask. Did anyone else come across this during their build?
C3 is there to filter a dedicated +5V (+5V2) supply for the fan only.
+5V2 also feeds IC2, which is for the USB power out. C3 helps filter low-frequency noise in conjunction with C2 for high-frequency. I would leave the 15uF capacitor populated but correct the polarity.
You're right, I didn't notice that.

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Re: Deckards Dream General Build Thread

Post by search64 » Wed Jul 22, 2020 2:54 am

Isn't it strange that this issue hasn't been found before...

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Re: Deckards Dream General Build Thread

Post by LED-man » Wed Jul 22, 2020 4:05 am

search64 wrote:
Wed Jul 22, 2020 2:54 am
Isn't it strange that this issue hasn't been found before...
Because most builds don’t use the Fan.
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Re: Deckards Dream General Build Thread

Post by Blue Meanie » Wed Jul 29, 2020 12:50 pm

LED-man wrote:
Wed Jul 22, 2020 4:05 am
search64 wrote:
Wed Jul 22, 2020 2:54 am
Isn't it strange that this issue hasn't been found before...
Because most builds don’t use the Fan.
Or the USB port :cookiemonster:

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