Introducing DM77 (Coron DS8 clone)

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dhaillant
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Introducing DM77 (Coron DS8 clone)

Post by dhaillant » Wed Dec 19, 2018 2:26 pm

Hey everyone, I'm working on a old project. It's a clone of the classic Coron DS8 drum synth.
I replaced almost entirely the original circuits in order to make the DM77 more compatible within a modular environment than the DS8.

The project is in version 0.2 and 0.3 is planned within next months.

So, the DM77 is similar to the DS8: a triangle waveform oscillator with an envelope generator, a VCA, a white noise source and an LFO. The oscillator is 1V/octave and is controled by a sweep parameter (dependent on the envelope) and a FM from the LFO.
I added an external input jack and a supplemental "impact" sound.

I'm not completely satisfied with the current state. I need to improve the impact section.

Here's a quick (cheap) video showing the 1V/octave tracking capabilities:
[video][/video]

I'll publish updates and news on this project soon.

Feel free to comment!

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Post by dhaillant » Wed Dec 19, 2018 5:31 pm

Image

Image

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Post by synthpriest » Wed Dec 19, 2018 5:36 pm

Interested in a PCB /panel set when it is available for sale, keep It up!

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Post by dhaillant » Tue Mar 12, 2019 5:43 am

Thanks :)

I'm still working on it:

I chose to slightly reduce the panel width: from 14 to 10HP

In order to reduce the width, I dropped some functionalities. I was unsatisfied with the "impact" sound who was pretty insignificant and barely noticeable after all.

I also removed the "trigger sense" pot. The only purpose of this pot was to attenuate the trig input. This is only useful when the module is used with some piezo sensor.
Attenuation can be done with a dedicated attenuator module for instance.

And I added a button for manual trigger.

The module is still built with Through Hole components only.70's style!

Proto PCBs are in production right now. I would be happy to send a couple PCB sets for review. Tell me if interested.

Image

Image

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Bamboombaps
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Post by Bamboombaps » Tue Mar 12, 2019 2:02 pm

interested!! :sb:

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Post by SphericalSound » Tue Mar 12, 2019 6:43 pm

Yeah, I would love to review it too :omg:

Edit: The song in your demo... It comes from the commodore 64 or spectrum... I have played that game but I can´t remember now... what it is?

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Post by dhaillant » Wed Mar 13, 2019 1:02 pm

Cool! Once I have the PCBs back, I'll let you know.

The tune is Chase, by G. Moroder :sb:

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Post by kragg » Wed Mar 13, 2019 1:08 pm

Hello, fellow french wiggler ;)
I'd be happy to build and review it too.

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Post by dhaillant » Mon Mar 18, 2019 8:42 am

Bonjour :cloud:
Thank you for your interest!

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Post by dhaillant » Sun Sep 01, 2019 3:58 am

Image

The DM77 is almost ready. I have some small adjustments to do but I'm pleased with the result.

You can find below a quick example of the sounds you can get with it. In the demo, the DM77 is driven by the MFOS 10 Step Sequencer.

https://soundcloud.com/dhaillant/dm77-various-sounds

The DM77 has been inspired by the Coron DS8, but it's not a clone. The main oscillator tracks pretty well 1V/Oct.

More information to come here: http://www.davidhaillant.com/category/electronic-projects/dm77/

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Post by dhaillant » Mon Sep 09, 2019 4:44 pm

I've published some documentation today. A quick circuit description, basic build guide along with an interactive BOM and the schematics.

This documentation will improve thanks to the feedbacks from the firsts builders.

http://www.davidhaillant.com/dm77-v0-5- ... bly-guide/

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Post by kragg » Tue Sep 10, 2019 6:28 am

very nice

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Post by Noodle Twister » Sun Sep 29, 2019 8:59 am

Finished building this last night. Works perfectly. Great module.

Some build pics..

[/img]

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Post by dhaillant » Sun Sep 29, 2019 12:06 pm

Nice build! Congratulations! :tu:

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Post by Noodle Twister » Mon Sep 30, 2019 12:13 pm

Thanks David. :tu:

Here's a pic of the 2k tempco in-between the two transistors.


I soldered one lead of each transistor (topside) to allow wiggle room. Next one lead of the tempco so that it's diagonal across the flat sides of the transistors.

Then bent the remaining tempco lead back to it's other pad, soldered and finished the transistors from the other side. Later I applied a small amount of thermal compound to the tempco.

Pretty straightforward build and definitely worth the effort.

No transistors were matched during the making of this module. It still sounds great though :hihi:
: ImageImage

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Post by dhaillant » Mon Sep 30, 2019 12:52 pm

Good job :cloud:

Matching the transistors only helps the VCO to not drift too much with temperature changes.
Personally I place the two transistors in close contact on their flat side, and put the tempco on the side.
Anyway, I think the DM77 can really be ok without any matched transistors nor tempco.

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Post by dhaillant » Mon Sep 30, 2019 12:53 pm

... Looking forward the first sounds :hyper:

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Post by MicroFi » Tue Oct 01, 2019 1:46 am

Bonjour David,

I really like this project.
Is there a way for me to get my hands on a couple of PCB's?

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Post by dhaillant » Tue Oct 01, 2019 1:56 am

MicroFi wrote:Bonjour David,

I really like this project.
Is there a way for me to get my hands on a couple of PCB's?
Bonjour !

I have a Tindie store.
You can also PM me.

The stock is low right now but I've ordered a fresh batch. :tu:

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Post by Noodle Twister » Tue Oct 01, 2019 10:52 am

dhaillant wrote:... Looking forward the first sounds :hyper:

https://soundcloud.com/user-130801280/d ... h-facility




A simplistic demo of the DM77. Except for the kick drum all sounds are from the DM77. No effects etc.

Just experimenting with rhythms for the most part, it's capable of much more than in this demo. There is more random stuff towards the end.

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Post by dhaillant » Wed Oct 02, 2019 2:33 am

Noodle Twister wrote: A simplistic demo of the DM77. Except for the kick drum all sounds are from the DM77. No effects etc.

Just experimenting with rhythms for the most part, it's capable of much more than in this demo. There is more random stuff towards the end.
Love it!!! :sb:
Thank you!

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Post by Noodle Twister » Thu Oct 03, 2019 6:45 pm

Thanks David.

Recorded this jam today with DM77 and a novation circuit. Towards the end the

'Ext in' of the DM77 is used to introduce some glitch. The bell type sounds (1m30s in) during the recording are the DM77.

https://soundcloud.com/user-130801280/dm77vscircuit

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Re: Introducing DM77 (Coron DS8 clone)

Post by dhaillant » Sat Jun 13, 2020 12:45 pm


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