Thanks kipling + LED-man, LED-man I sent you an email. I'm finally getting around to building my rev. 3 PCB! Are you sorted for these switches now? The only place that has them available now at a sensible price seems to be tti, https://www.tti.com/content/ttiinc/en/apps/part-detail.html?mfrShortnam...

Does anyone have a good source for 17 Switchcraft 46313LDRX? Mouser is out of stock of them for now, and they would've been $2.90 per unit. Other distributors were more expensive, which at 17 adds up. I believe DSL-Man/LED-Man may have a set of them. He’s in Germany though. I presume you are buildi...

The Meanwell DKE10A-15 is a much cheaper option than the Artesyn part. Currently £15.06 at Mouser. Can't argue with that. I've opened the sequencer up now and my board is actually the REV 2 from May 2nd 2015.Can I still use that converter? Yes indeed you can. The dc/dc converter only changed at Rev...

You’ll need the original style dc/dc converter with the 1” x 2” footprint similar to the early TTSH. There are a few cheaper options other than the one I originally specified. I looked up the Rev 1 Mouser BOM on LED Man's page and it looks like that part is still the same, i.e. AEE00CC18-LS. Am I g...

I think my questions regarding updated parts and compatibility are mostly answered at the front of the thread - I had another look :hihi: You’ll need the original style dc/dc converter with the 1” x 2” footprint similar to the early TTSH. There are a few cheaper options other than the one I origina...

Glad we can all get along here for the benefit of those who run into difficulties.

Assuming that you have socketed the ICs, I would remove all components (there are only four ICs) that connect to TP17 on net 0454; Z25, Z21, Z24 and Z27 and check that TP17 is not held high or low by a short to +15V or Ground, it should be totally floating. Check the sockets are OK from above (no go...

Note that these six trimmers are not in the original ARP design so do not appear in the service manual. I added them to make the 1601 clone more eurorack-friendly where gate/clock voltages of 14V could be damaging.

An enlargement of the PCB layout for the Rev 6a board with the six trimmers highlighted

There are six of them along to top edge of the PCB. Each is marked with its function. I’ll sort out a picture ASAP.

oscarthesquirrel wrote: ↑

Sun Aug 30, 2020 5:16 am

Thanks Kipling - that may well be the issue....perhaps it was set for Eurorack rather than an original 2600....

Really appreciate the prompt advice.

THX !

More likely those trimmers were left mid-position as they generally are from the factory.

If you have one of the latest Rev 6a PCBs then all the gate and clock outputs have individual trimmers along the top of the board to set the output voltage. They are all labelled so you should be able to adjust them all to suit. For ARP gear including the TTSH you will need to adjust these to maximu...

^ alfa has a 3046 now in both dip and SOIC Thanks for making that known. I see that Thonk (UK) now stocks both versions https://www.thonk.co.uk/shop/alpha-as-series-ic-chips/ and SynthCube stock the DIP14 version https://synthcube.com/cart/alfa-rpar-synth-ics. I presume there are other suppliers too.

It will be easy to change the PCB to soic for this chip.

EDIT: already done!

@Kippling, do you think it would be possible for someone who is crazy to get that MC14528 SMT from mouser into use? Or will the DIP have to be ordered somewhere else? I just can't be bothered finding a supplier to order a single component from... Below is what was missing from mouser and will need ...

Good news Fernando

And well done to Mattia!

I'm trying to find a trimmer resistor (Bourns RJ24FW103)...... Bourns RJ24FW103 pricing and available inventory: https://octopart.com/rj24fw103-bourns-974022 Gerber Electronics in MA is selling it for $1.00..but I don't know the shipping cost. You can use the Bourns 3296W trimmer (three pins in a l...

funkytransport wrote: ↑

Tue Jul 21, 2020 8:33 am

Thank you Kipling

Hello there.. I just picked up a Rev 3 1601 PCB and Panel... I've had a skim through this thread but can't seem to find the Rev 3 BOM? Is there one out there? or should I work off rev 2 or rev 4? Thanks for any help Iain Use the Rev 2 BOM, and source the non-Mouser parts elsewhere, notably the LM30...

It's all working now and TPs give all the correct signal. It seems to be that it was really all related to the Z4. Will post some videos on YouTube soon. Hope to finish my Keyboard for the TTSH soon as well. :tu: Your keyboard looks promising. I like the sound of a ribbon controller. I saw it on on...

I'm facing some issues with my build. Now I hope that someone tells me that all is related to each other and that Icxxx is most likely defective :-D I think there’s more than one issue. I’ll give you my more detailed thoughts tomorrow when I can get to my PC. In the meantime I presume you have the ...

I'm facing some issues with my build. Now I hope that someone tells me that all is related to each other and that Icxxx is most likely defective :-D I think there’s more than one issue. I’ll give you my more detailed thoughts tomorrow when I can get to my PC. In the meantime I presume you have the ...

R210/R211 Values I am gently building my 1601 (rev 5) and was wondering about R210/R211 values one is 10k the other 100k, this traces back to the original service manual. Both resistors are however used at the same place in channel A and B quantized output memory. There is obviously an error, altho...