Arp 1601 Sequencer clone

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roglok
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Post by roglok » Tue Jun 10, 2014 3:22 pm

Vcs3 wrote:Challenge no. 1: sourcing the right look and feel pushbuttons/keys.
(the three white ones).
how about these:
http://www.wasdkeyboards.com/index.php/ ... ngles.html

on top of some Cherry MX:
http://www.cherry.de/cid/keymodules.htm ... 2-D0E3B932
?

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roglok
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Post by roglok » Tue Jun 10, 2014 3:24 pm

oh, had the window open for a while - pre55ure beat me to it :)

but at least i found the blank keycaps...

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pre55ure
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Post by pre55ure » Tue Jun 10, 2014 3:31 pm

Nice !!
Ive been looking for someone who just sold blank cherry MX keycaps for forever!!! Awesome!

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roglok
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Post by roglok » Tue Jun 10, 2014 3:44 pm

they even do custom laser etched graphics at an affordable rate... http://www.wasdkeyboards.com/index.php/ ... ad-image-1

patroche
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Post by patroche » Sun Jul 06, 2014 2:18 am

I have build a ARP Sequencer . here all schématics
http://www.crazy-patroche.com/article-f ... 37192.html

Image

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delayed
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Post by delayed » Sun Jul 06, 2014 2:45 am

Great looking job. What size did you print your PNP Blue layout for the PCB?

patroche
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Post by patroche » Sun Jul 06, 2014 5:46 am


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mOBiTh
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Post by mOBiTh » Sun Jul 06, 2014 5:54 am

8_)

flts
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Post by flts » Sun Jul 06, 2014 6:10 am

that is seriously nice. makes me want to try it out as well - i've never home etched double sided pcb nor that big pcbs though...
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delayed
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Post by delayed » Sun Jul 06, 2014 12:08 pm

what was the pcb size?

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Post by jaidee » Mon Jul 07, 2014 5:25 pm

Patroche's home-etched PCBs are a thing of beauty, but their, size, complexity, and being double-sided puts them beyond my modest etching ability and I suspect that of the majority of this community. Also, if I've understood the build details correctly (unfortunately my French is non-existent) a daughter board has to be used to mount the slide pots. I would love it if these boards could me made available.

Kogx23's design appears to be a reworking of the original design so as to accommodate parts available from Mouser, and as such seems potentially more viable for a group project. Unfortunately, kogz23 appears to have gone off the radar...

I hope that Patroche and/or kogz23 are able to make a run of these boards available for general consumption :hyper:

patroche
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Post by patroche » Fri Jul 11, 2014 3:46 am

a daughter board has to be used to mount the slide pots.
Not if you use original pots

I dont sell PCB it's just for FUN and DIY !

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Post by flts » Fri Jul 11, 2014 7:31 am

Are the original ARP2600 sliders same ones used in Odyssey (II)? Or do they have a different footprint?

The Odyssey replacement ones I've found (I think the ones that Synthrestore sells as well) have been so awful, that sensible options in that case would only be NOS originals or different footprint ones with adapter board.
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dougt
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Post by dougt » Fri Jul 11, 2014 10:15 pm

2600 sliders are different than the Odyssey/Axxe/Sequencer ones...

Yeah those new Chinese sliders looked to cheaply made for me...

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kogz23
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Post by kogz23 » Sat Aug 30, 2014 5:17 pm

Sorry for disappearing of the radar for a few weeks. Been on holiday in the UK for the last few weeks, neglected all forums while gone!
I am back on the project. I will make a 2nd pcb prototype as there were a couple of errors and I want to put the jacks suggested into the BRD.
Before I go ahead with the prototype I will take any suggestions for improvements.
I will report back asap with a corrected eagle brd and sch file.

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Post by afx » Sun Aug 31, 2014 3:38 pm

Patroche, that's pretty cool!

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Fubard
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+1

Post by Fubard » Sun Aug 31, 2014 10:25 pm

I'd be interested for sure. ESPECIALLY if someone'd offer a front panel.

:yay:

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delayed
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Post by delayed » Mon Sep 15, 2014 2:45 pm

Glad this is moving forward.

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henrybirdseye
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Post by henrybirdseye » Mon Sep 15, 2014 9:02 pm

I'm a 2600 guy, and I would lust for one of those.

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InfraXpert
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Post by InfraXpert » Tue Sep 16, 2014 1:14 am

I would be in for two PCBs.
Hope it is something that happens.
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ualslosar
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Post by ualslosar » Tue Sep 16, 2014 8:15 am

I'd like one too as well.

Thanks
Larry

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Kipling
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Post by Kipling » Fri Oct 17, 2014 12:27 pm

I've been considering cloning this as well and have been going through the schematics noting down components (creating a BOM effectively).

I've hit on a few snags recently in that a few resistors can't be found on the schematic, notably R124-128 and R160-162 inclusive after a fairly thorough search. I've also noted that on the original ARP PCB they have R204 and R211 crossed when compared with the schematic - the numbering on the schematic is logical so I assume the PCB legend is wrong.

Now this doesn't matter a great deal as both are shown as 100k, but looking at the Channel A and B memory circuits on page 16 of the Service Manual I'd expect them to be identical, which they are in every respect, except that the resistor between Pin 10 of the CD4007AE and Pin 1 of the LM1458 is 10k (R210) in the Channel A Memory and 100k (R211) in the Channel B memory, so I'm going for 100k for both personally.

I'm also missing Q28 as well.

As far as I can tell the BE series CMOS devices are a slightly higher supply voltage rating than the AE series parts specified, so I'll be using them, except for the CD4007 which is only available in an un-buffered version (UBE) which I'm hoping is OK.

Finally, well so far at least, there's a discrepancy in the value of trimmers R217 & 218 between the schematic & PCB (both show 1k for each) and the Parts List which shows these two as 2.5k. I'm guessing that 1k is correct as I can't imagine you'd need to have a 9.76k 1% resistor in series with a trimmer that gives you another 25% variation in total resistance, when a cheaper (in those days) 10k 10% plus 2.5k trimmer would allow all the range you need regardless of tolerance. So I'll go with the 1k to start with and if that doesn't give enough range then I'll swap them out.

I would be using Bourns LED sliders - either 45mm or 60mm, whichever looks best as the row of 16 LEDs will go to be replaced by the LED in each slider so each would only light when it's active. Same for the clock LED too.

I would intend to have all components including sliders and jacks on one double-sided PCB which I'd have professionally made.

For the pushbutton switches I'd also use Cherry MX1A (I think we can ignore the max 12V DC rating), with blank low-profile DSA PBT series keycaps from Signature Plastics (keyshop.pimpmykeyboard.com). The numpad set will give you enough for 4 complete builds, or the other sets will give you loads of them. These caps appear not to be a sloping profile cap unlike any regular keyboard keycap so should look a little better in my opinion being symmetrical in all directions.

On the TTSH Sequencer & Expander front, we may have an indication from zthee fairly soon whether this is going to materialise or not. I'm not in touch with him directly but one of his beta testers is and will ask him the question. If he does get it to market I'll back off from my project and build that instead.

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Post by ahmo » Fri Oct 17, 2014 1:12 pm

I think the addition of envelopes is great but unnecessary.

Within the sequencer you can patch a trigger out to an EG and sum it with the output voltages for sweeps slides and blips. He should make it 2 adsr's tho.

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Kipling
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Post by Kipling » Sun Oct 26, 2014 4:00 am

emdot_ambient wrote:I actually have an original one, but it's in need of servicing. Might just be it needs complete slider refurbishing, or it might need more care than that. Whatever, these are really nice sequencers
Any chance you can take a close-up photo of the component side of the PCB, top left corner area (as you look at it from the rear) around Z32 and Z33 as I'm trying to verify the value of R204, R210 and R211 (which are either 10k or 100K or a mixture of both), and also nearby trimmers R217 and R218 (which are either 1k or 2.5k). There are discrepancies between the schematic diagram and the parts list and PCB markings in the service manual.

Thanks

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Post by ultravox » Tue Oct 28, 2014 11:09 am

Kipling wrote: On the TTSH Sequencer & Expander front, we may have an indication from zthee fairly soon whether this is going to materialise or not. I'm not in touch with him directly but one of his beta testers is and will ask him the question. If he does get it to market I'll back off from my project and build that instead.
Two weeks ago I sent an email to Jon/zthee asking if the Sequencer & Expander was forthcoming but he never replied. If he's given up on the idea then I'd be interested in your project assuming it follows the same format.

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