CR-78 Snare module

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mangros
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CR-78 Snare module

Post by mangros » Mon Nov 23, 2015 9:28 pm

I've been tinkering with a CR-78 Snare clone for ages. Its lovely robo-tschick is by far my favourite snare sound, and I've gone through a few PCB layouts to get to something solid. I've bolted on some extra features, mostly by stealing from other drum circuits, and despite my rudimentary grasp on the theory it can do a nice range of vintage drum sounds.

Here are some demos where I fiddle with the controls alongside other drum sounds. The controls are: drum tune, noise decay, noise filter, and drum/noise mix.

https://soundcloud.com/radiantsuicide/c ... odule-demo

https://soundcloud.com/radiantsuicide/c ... dule-tests
(please ignore the mains hum in the second demo, it was my power supply.)

More info:

15V or 12V, takes 5V gates (demo sounds are being triggered by MI Grids)
BC549 transistors, no obscure parts
Cramped board but all through hole with a few vertical resistors
Board mounted Alpha 16mm pots to suit a 6HP panel, but with extra pads for wiring/headers
Current board version is 83mm x 50mm, $32 for three at OSH Park.

PCBs for sale at OSH Park

It seems to work great, but if anyone wants take a look at the schematic/board to check I haven't done anything daft I'd be very grateful.
The attached images show the latest board layout which I haven't ordered yet. It's mostly the same as the version used to record the demos, but replaces a unity gain buffer with an inverting amp.

I haven't really got any plans for this other than making the OSH Park project public, but I could maybe get a stock of boards and acrylic panels made if there was enough interest.
Attachments
78SD.zip
78SD BOM, panel Illustrator file, schematics and board image
(305.19 KiB) Downloaded 168 times
Last edited by mangros on Fri Jan 15, 2016 3:55 pm, edited 3 times in total.
Deadly sci-fi electro: http://soundcloud.com/radiantsuicide
Futuristic fonts: http://disasterfonts.co.uk

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falafelbiels
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Post by falafelbiels » Tue Nov 24, 2015 3:30 am

Cool little snare!

Nothing more to add except I hope to build one soon...

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unrecordings
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Post by unrecordings » Tue Nov 24, 2015 4:30 am

Nice
I'd order a pcb (don't need panel)

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spacedog
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Post by spacedog » Tue Nov 24, 2015 8:00 am

WOW - 8-)

:guinness:

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oberkorn
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Post by oberkorn » Wed Nov 25, 2015 4:18 pm

nice minimal sound, love it!
if you do make some PCBs/panels i'll take a set :party:
you have to pay for the music but the noise is free

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mangros
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Post by mangros » Wed Nov 25, 2015 6:39 pm

Cheers all!

I've ordered three PCBs of the latest layout from OSH Park and been upgraded to the 'Super Swift Service' for no cost as they had some space on an order. Hopefully this means I'll get them in a week or so.

I'll build two and if they both work then the fun can start!
Deadly sci-fi electro: http://soundcloud.com/radiantsuicide
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spneca
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Post by spneca » Wed Nov 25, 2015 9:17 pm

I'm in if you have an extra PCB.

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InfraXpert
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Post by InfraXpert » Thu Nov 26, 2015 1:37 am

I'm in for a couple of PCBs.
No panel, please :0)
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roglok
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Post by roglok » Thu Nov 26, 2015 3:34 am

nice, right on time! i'm interested in a PCB. layout looks good. you could add a ground plane and some decoupling caps close to the IC power pins but it will probably work fine as is...

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the bad producer
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Post by the bad producer » Sat Nov 28, 2015 5:12 pm

I'd be in for a couple of PCB's too, CR78 snare has been on my list for years, nice job!

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mistahad
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Post by mistahad » Tue Dec 29, 2015 11:25 am

if you get more pcbs in then im up for one!

basicbasic
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Post by basicbasic » Tue Dec 29, 2015 6:35 pm

Best snare ever. I'd be up for a PCB (and Euro panel if you do one).

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janost
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Post by janost » Tue Dec 29, 2015 6:54 pm

Thats nice.
Last edited by janost on Wed Dec 30, 2015 3:14 am, edited 1 time in total.
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falafelbiels
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Post by falafelbiels » Tue Dec 29, 2015 7:39 pm

Be nice Jan.

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c1t1zen
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Post by c1t1zen » Tue Dec 29, 2015 9:14 pm

Yes I'm interested in two. My favorite "SHH" snare!

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Eloc
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Post by Eloc » Tue Dec 29, 2015 9:40 pm

falafelbiels wrote:Be nice Jan.
I like to imagine he was questioning the use of the word "nice" as an adequate adjective to compliment the fruits of someones labour. Like "That's 'nice'? Come on guys you can use a more descriptive adjective than that..."

But in reality I guess he was just being insolent.

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janost
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Post by janost » Wed Dec 30, 2015 4:12 am

falafelbiels wrote:Be nice Jan.
I didn't mean to be sarcastic.

Don't know why there was a question mark there.
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Check Mate
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Post by Check Mate » Wed Dec 30, 2015 6:07 am

I'd also be interested in a PCB/Panel!

Cheers

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Post by flts » Wed Dec 30, 2015 8:11 am

following this with interest! a single pcb would be cool, or if you make the oshpark project public after confirming it's ok i might just order a set of 3 from there directly to me and local wigglers.
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mangros
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Post by mangros » Thu Dec 31, 2015 11:43 am

Hello snare fans! The OSH Park project is now shared. I've only built one from the shared project, but it works fine. I've built two with the previous board revision that also worked fine - the only change on the latest board turns what was a unity gain buffer into an amplifier with some gain. I reckon it's safe to buy!

https://oshpark.com/shared_projects/C6dqLtvr

It should be $32 with free shipping for three boards. However if you don't want three of them then I'll have to start some sort of list and work out costs, which will be a fabulous new experience for me and probably take a while to organise.

I'll finish off the BOM/build notes soon and add them to the first post in this thread.
Deadly sci-fi electro: http://soundcloud.com/radiantsuicide
Futuristic fonts: http://disasterfonts.co.uk

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J3RK
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Post by J3RK » Thu Dec 31, 2015 12:05 pm

Nice! Always like the sound of this machine.

You've opened the door to DIY 80s soft-rock-pop though. I hope you're aware of the consequences! :hihi: :party: :yay:

I suppose I can go for that though. :razz:
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mangros
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Post by mangros » Thu Dec 31, 2015 12:18 pm

Noooooooooo! It's all about crisp stark minimalism!

[video][/video]
Deadly sci-fi electro: http://soundcloud.com/radiantsuicide
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flts
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Post by flts » Thu Dec 31, 2015 2:35 pm

great. will order.

for some reason i associate that particular snare with minimal wave / new wave / synth wave / whatever-they-call-it stuff. the kind of minimal and obscure synth music of late '70s and early '80s and the more recent retro-pastiche stuff.
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J3RK
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Post by J3RK » Thu Dec 31, 2015 2:36 pm

flts wrote:great. will order.

for some reason i associate that particular snare with minimal wave / new wave / synth wave / whatever-they-call-it stuff. the kind of minimal and obscure synth music of late '70s and early '80s and the more recent retro-pastiche stuff.
I associate it with Hall and Oates. :hihi:

Is that a mental disorder?
Are you lemon? Does your head come to a nub?

flts
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Post by flts » Thu Dec 31, 2015 2:42 pm

^- That's not bad either! :)
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