[sdiy] Korg KLM-1050 delay PCB

Daniel Roberts danmroberts at gmail.com
Mon Jun 26 05:18:04 CEST 2023


The Korg DW-8000 has it as well, as KLM-775.

On Sun, Jun 25, 2023 at 10:18 PM grenert via Synth-diy <
synth-diy at synth-diy.org> wrote:

> The Korg DS-8 (FM synth) also used the same SDD-type digital delay.
>
>
> On Sun, Jun 25, 2023 at 6:25 PM Adam (synthDIY) <synthdiy at adambaby.com>
> wrote:
>
>> I do love the sound of 1980s 12-bit delays!
>>
>> I have a variety of Rolands, but the Korg unit I have is a SDD-3000,
>> quite a different animal (and looks to be actually 13-bit from the circuit).
>> When you say "Korg ICs" , are there proprietary Korg chips in these
>> things?
>> Roland certainly got into this game, using the same chip across a variety
>> of Boss products.
>>
>> A
>>
>> On 26 Jun 2023, at 5:23 am, NT <nathan at idmclassics.net> wrote:
>>
>> I got obsessed with this era of Korg delay since I first got a DSS-1.
>> These are the same Korg delay ICs as used in the SDD-1000 and SDD-1200 dual
>> version. I forget if the IC in the Poly 800 mk2 is the same or an adjacent
>> version, but it's also very close.  I think these are just grimey and warm
>> enough to get excited about if that's your sweet spot. The character they
>> add to DSS-1 and Poly800 is very nice.
>>
>> At one point I was going to convert a DSS-1 delay board to be standalone
>> until discovering it was also used in the 1000/1200. Thankfully nothing
>> special is needed to control these - check out the SDD-1200 service manual
>> for a basic implementation with a CV controlled clock source and
>> modulation, and compare to the DSS-1 pdf pg22 to see whats missing on
>> there. A lot of the front panel parts on the SDD are redundant for the
>> second channel.
>>
>>
>> https://www.synthxl.com/wp-content/uploads/2020/06/Korg-SDD-1200-ServiceManual.pdf
>> http://www.buchty.net/korg/files/Korg%20DSS-1%20Service%20Manual.pdf
>>
>> Nathan
>>
>> On Wed, Jun 21, 2023 at 10:03 AM Roman Sowa <modular at go2.pl> wrote:
>>
>>> It uses masked ROM microcontroller made probably exclusively to KORG, so
>>> unless someone searches forgotten cellars of KORG factory, no info will
>>> ever come up.
>>> Why don't you hook up logic analyser or a scope in working DSS-1? I
>>> don't expect anything more complex than a few bytes sent only when
>>> effect type is changed. Maybe with very few parameters too.
>>>
>>> But is it so impressive to make a module aout of it?
>>> 12-bit digital delay from the 80's
>>>
>>> Roman
>>>
>>> W dniu 2023-06-21 o 13:46, mark verbos via Synth-diy pisze:
>>> > Hi,
>>> >
>>> > I have a couple of KLM-1050 PCBs in a drawer in my shop. That’s the
>>> delay board from the DSS-1, maybe others as the KLM-775. Over the course of
>>> 20 years or so that these PCBs have lingered with me, I have occasionally
>>> wondered if they could be turned into a standalone unit. Looking at the
>>> schematic, the audio path in and out seems complete. The control of delay
>>> time, feedback and effect level is on 3 digital pins labelled “DATA”,
>>> “CLK”, and “STB”. Has anyone cracked the code to control these? It’s
>>> outside my area of expertise, but maybe someone has taken a deep dive.
>>> >
>>> > Mark
>>> >
>>> >
>>> >
>>> >
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