Deckards Dream General Build Thread

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synthnl
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Re: Deckards Dream General Build Thread

Post by synthnl » Mon Apr 20, 2020 11:14 am

OK thanks for the quick replies. I will look for the beveled side. I looked for the notch initially and the picture is a bit deceiving because in my eyes there was a notch on both end or on neither end :) This is microscope stuff :)

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Re: Deckards Dream General Build Thread

Post by synthnl » Mon Apr 20, 2020 11:15 am

And thanks for that picture. I did find that as well and based my orientation on that actually. I looked at the orientation of the text actually.

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Re: Deckards Dream General Build Thread

Post by synthnl » Mon Apr 20, 2020 11:17 am

Hmmm. OK. I see my bevel is up :( OK. I will order a new one. Thank you very much!

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Re: Deckards Dream General Build Thread

Post by Chrutil » Mon Apr 20, 2020 2:50 pm

synthnl wrote:
Mon Apr 20, 2020 11:17 am
Hmmm. OK. I see my bevel is up :( OK. I will order a new one. Thank you very much!
Huh.. No I actually think you are good.
I got curious so I took mine apart and took a few photos.
I am pretty sure that they don't change the alignment of the text for the same component so I think you are good.
The bevel is hard to see from some angles, and you might have to adjust the light to make it obvious.

Here is a photo of mine - and you can clearly see the bevel facing the bottom side of the text label.
p1.jpg
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Re: Deckards Dream General Build Thread

Post by synthnl » Tue Apr 21, 2020 8:39 am

Oh thank you very much for that picture. I don't think they will change the text orientation either :) Thanks a lot!

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Re: Deckards Dream General Build Thread

Post by mnmldani » Mon May 04, 2020 2:52 am

Hi I am currently building a Deckards Dream MKI and wonder if it is a good idea to use sockets for the ICs instead of directly soldering them to the PCB boards to make an exchange easier. Does anybody of you have experience with this or is the bad idea?

Thanks

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Re: Deckards Dream General Build Thread

Post by synthnl » Mon May 04, 2020 4:26 am

Personally I never soldered any ICs directly to a PCB. So yes I think sockets are a very good idea.

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Re: Deckards Dream General Build Thread

Post by synthnl » Mon May 04, 2020 5:23 am

I'm currently building the hardware PCB. I'm confused about something in the BOM. I see 10-100K for the potmeters. So the value is not important? Or is there an advantage for 100K over 10K? Less power? The strange thing is I ordered a parts kit and it includes 100K for the 100mm pots, 100K for the 15mm detent pots, but 10K for the other 15mm pots, even though the stickers says 100K on the bag. The mouser part number in the BOM states a 10K part. So can I safely install the 10K? I assume they are only voltage dividers, or should I order 100K for less power consumption? I hope someone can give me some clue :)

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Re: Deckards Dream General Build Thread

Post by sduck » Mon May 04, 2020 9:54 am

It doesn't matter - the controller sorts it out.
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Re: Deckards Dream General Build Thread

Post by synthnl » Mon May 04, 2020 10:40 am

OK thanks

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Re: Deckards Dream General Build Thread

Post by c0ntr4d1ct10n » Thu May 14, 2020 2:51 am

I'm about to start ordering parts for my DDRM build.
How many of you used the cheapest parts for your build?
I have compiled a couple of versions of the bom with pricing to compare buying the stock mouser parts and buying majority of the parts from Tayda.

I noticed caps and resistors are $0.01 each from Tayda - what kind of issues can I expect from these?

Also, another major item is the IC sockets. The default bom recommends an already cheap version of the gold plated ones from China on ebay. If people are already having problems with these (and even with the synthcube ones), then would there be any point in getting these types over the cheaper traditional dual leaf contacts (which for me seem like they would hold the pins better)?

If I get the cheapest parts, then I could pretty much halve the cost of components.

Btw, I most likely will never be selling the DD (whenever I end up getting all the parts and finishing it), but if I did, I wouldn't realistically advertise it for the $3000usd (its over $5000aud here in oz). I would be straight up warning buyers up front that cheap parts were used and sell it at a lower price.

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Re: Deckards Dream General Build Thread

Post by JanneI » Thu May 14, 2020 4:07 am

The component cost is more about the price-break than where you buy them; if you buy 1000pcs of all the resistor values, it'll be as cheap as Tayda. Of course, you probably won't, but at least check if it's cheaper to buy 100pcs instead of 32pcs (or whatever the BOM says).

Tayda resistors should be ok, but I would measure them ALL before soldering since there can be more than +-1% tolerance among them.

For capacitors I would go with the BOM parts, c0G mostly, no X7R if not necessary.

Also, DD is a huge project, so if you are relatively new to SDIY, please do yourself a favor and just follow the BOM. It can save you time in the end since troubleshooting this large project is quite time-consuming. If you are building it to save money, sorry, there's not that much to be saved compared to the pre-built version. It all depends on the "level of SDIY skills" and the stock of SDIY components purchased on large amounts.

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Re: Deckards Dream General Build Thread

Post by LED-man » Thu May 14, 2020 4:33 am

In the case of DDRM and Kijimi is the price break mostly for 200 resistors, but you find other metal Film resistors which have the price break for 100 which are cheaper than 48 for example.
I ordered the most parts from tme.eu, especially the ICs are cheaper there (but same manufacturer)
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Re: Deckards Dream General Build Thread

Post by c0ntr4d1ct10n » Thu May 14, 2020 7:14 am

Thanks for the advice. I compared the price break on Mouser and Tayda still came out significantly cheaper - but a lot of it is because of the caps.

I'd like to think that ive gained a sufficient amount of soldering experience in the past couple years from building two rows of 84 hp Mutable Instrument micro clones (yes, even a few Links and 0402 Plaits and Marbles). But I am still learning the fundamentals of electronics and why certain things are they way they are. I started attempting to learn this by repairing vintage synths, which is a recent hobby I picked up only this year. So advice on componentry is definitely appreciated.

Just realised in terms of caps, the much cheaper value I found on Tayda is actually the 0603s, which I work with most of the time anyway. I've found its actually easier to solder 0603s onto 0805 pads anyway. I'm assuming there shouldnt be any other issues with using 0603 100nf caps?

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Re: Deckards Dream General Build Thread

Post by sduck » Thu May 14, 2020 9:54 am

Besides the advice above I'll throw in to not cheap out on the sockets. I had to do some significant troubleshooting to resolve several issues involving bad sockets on my Kijimi.
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Re: Deckards Dream General Build Thread

Post by JanneI » Thu May 14, 2020 12:09 pm

c0ntr4d1ct10n wrote:
Thu May 14, 2020 7:14 am
Just realised in terms of caps, the much cheaper value I found on Tayda is actually the 0603s, which I work with most of the time anyway. I've found its actually easier to solder 0603s onto 0805 pads anyway. I'm assuming there shouldnt be any other issues with using 0603 100nf caps?
Yes, you can use 0603 X7R for the bypass caps SMD.

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Re: Deckards Dream General Build Thread

Post by c0ntr4d1ct10n » Thu May 14, 2020 10:02 pm

anyone know if there's a spare 5V or 12V pin somewhere that you can hook up an LED strip to? The schematics are a bit scant on detail.

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Re: Deckards Dream General Build Thread

Post by sduck » Thu May 14, 2020 10:05 pm

There are voltage test points on the power card.
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Re: Deckards Dream General Build Thread

Post by c0ntr4d1ct10n » Thu May 14, 2020 11:15 pm

sduck wrote:
Thu May 14, 2020 10:05 pm
There are voltage test points on the power card.
Nice, this will suit my plans to build my own acrylic faceplate with Bladerunner inspired artwork :yay:

On the topic of leds, has anyone tried or thought about either adding leds to the slider pots, or somehow getting those led slider pots (which I know have a couple of extra pins). I guess probably adding leds (the smd types) to the slider pots might be more achievable (I've done this with a nanoRings module with some limited success but it glitches out at the extremes). I heard that the firmware automatically adjusts for the pot range (which is why any pot within 10k-100k can be used) - is this correct?

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Re: Deckards Dream General Build Thread

Post by JanneI » Fri May 15, 2020 3:03 am

c0ntr4d1ct10n wrote:
Thu May 14, 2020 11:15 pm
I heard that the firmware automatically adjusts for the pot range (which is why any pot within 10k-100k can be used) - is this correct?
Slider pots are just voltage dividers that ADCs read, so it doesn't matter, 10k or 100k both ok.

LED sliders have extra pins and can't be used as is. Also, extra unnecessary LEDs are usually a bad idea, imho.

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Re: Deckards Dream General Build Thread

Post by c0ntr4d1ct10n » Fri May 15, 2020 6:32 am

JanneI wrote:
Fri May 15, 2020 3:03 am
c0ntr4d1ct10n wrote:
Thu May 14, 2020 11:15 pm
I heard that the firmware automatically adjusts for the pot range (which is why any pot within 10k-100k can be used) - is this correct?
Slider pots are just voltage dividers that ADCs read, so it doesn't matter, 10k or 100k both ok.

LED sliders have extra pins and can't be used as is. Also, extra unnecessary LEDs are usually a bad idea, imho.
I am a fan of bad ideas :hihi:

I guess it would just be a case of building my own adapter boards for each slider and connecting the extra 2 LED pins to my own circuit (using the appropriate resistors and wiring) then controlling that with something like an Atmega328p, hooked up to a 5V or 3.3V supply pin. Since I'm building my own acrylic faceplate anyway, I guess I would need to consider that additional offset of the slider adapters. Then the only other thing I would need is to use a 12VDC 7A or 8A laptop power supply to account for the additional 1A of the LED sliders + 1A of the LED strip. Unless I'm missing something :hmm:

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Re: Deckards Dream General Build Thread

Post by search64 » Sat May 16, 2020 6:50 am

If anybody here has a full or partial kit they don't see themselves finishing anymore, hit me up I'm interested...

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Re: Deckards Dream General Build Thread

Post by c0ntr4d1ct10n » Sat May 16, 2020 12:01 pm

I'm wondering if anyone has bought an excess of some of the more expensive components for DDRM to take advantage of the price break and is looking to sell them at competitive prices. i.e. CEM3340/AS3340, V2164D, slide pots, etc.

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Re: Deckards Dream General Build Thread

Post by search64 » Mon May 18, 2020 2:18 am

Are there any mirrors for the V1 build docs, BOM and firmware? The links in OP are all dead.

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Re: Deckards Dream General Build Thread

Post by c0ntr4d1ct10n » Mon May 18, 2020 4:00 am

search64 wrote:
Mon May 18, 2020 2:18 am
Are there any mirrors for the V1 build docs, BOM and firmware? The links in OP are all dead.
Have you tried this site: https://www.dsl-man.de/display/DDRM/DDRM+rev.1+guide

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