Quick Start Guide
Bill of Materials
Capacitor and Resistor Lookup Guide
Download the Visual BOM
Download the BOM
the trim pots on this bom have an incorrect mouser part number
\1 50k Linear Single-turn Trim Pot R31 531-PTC10V-10K
1 100k Linear Single-turn Trim Pot R8 531-PTC10V-50K
These are too large. close but no cigar.
Sorry about having the wrong part number on there, must have been a mistake. According to the datasheets, it looks like these will get you done. I’ll update the Bill of Materials to show this difference.
50k Linear Single-turn Trim Pot R31 – 652-3306F-1-503
100k Linear Single-turn Trim Pot R8 – 652-3306F-1-104
Why not stick with the sealed pihers just the right size?
Would love this but I have a dot com system. Is it possible to build for 15v?
We have not done any testing with +/- 15V on the DLY module. That being said, though, our ECHO can use 15v, and I believe this one may be able to as well. The onboard voltage regulator can definitely handle it, and the TL072 ICs should be fine with it, but it is untested, and we can’t guarantee it will work.
-Patrick at Synthrotek
I don’t find the CI PT 2399 on mouser.
Could you Help me?
Thanks and wonderful products !!!
You can grab it from us here: http://store.synthrotek.com/PT_2399_Integrated_Circuit_IC
In the visual bill of materials you have the LM78l05 shown, in the parts list it shows LM78L05. Perhaps change the visual bill of materials from lower case “l” to upper case “L” in the part number.
Hey Alex, Good catch! I’ll make sure that gets changed.
Is there a schematic available for the DLY module? I’d like to compare it with the Echo and also buy extra parts for little mods I’d like to make to put the DLY into my mostly MOTM system. Nice sounding module, by the way! Thanks for the videos.
Due to different licensing agreements, we are not able to make all of our schematics available to the public.
Here is a demonstration of the differences between the DLY and Echo:
If you have specific mods in mind we would be happy to offer any help we can!
Thanks Zach! I’ve built the module and the only issue I found is that I can’t get the full delay range with the +- 15 volt MOTM supply. I did a quick calculation and it seems that changing R24 (300K) to a 120K will provide the required -5 volts to the input of the CV circuit. I’ll swap R24 out and test tomorrow, then send you the results.
The only other mod I could want may be a little more low pass filtering of the delayed signal. Given how the module will get used, however, this can be accomplished elsewhere in the patch. Also, I’d hate to limit the output just to mellow it.
Well now, I got that exactly wrong! It seems I should calculate for current through the 300K resistor at -12 volts and divide -15 volts by that current, giving me a resistor value for R24 of 375K.
Time for a rest.
DLY module working as it should now! R24 was changed to 390K and the delay time CV and control pot sweep the delay time through the entire range. I adjusted the trim pot for a little bit of glitchy fun at the upper end of the range, too.
Great little module, and fairly easy to adapt to other formats! Thanks Synthrotek!
I’m curious about the optional R13. What is that part doing? If I omit it, should I complete that connection with a resistor leg?
Hi Zetsu, go ahead and populate it if you have a 1M resistor. Don’t use a resistor leg.
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