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 Forum index » DIY Hardware and Software
TR-808 Voice STRIP Boards...
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LektroiD



Joined: Aug 23, 2008
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PostPosted: Tue Aug 09, 2016 6:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Has anyone done stripbaord layouts of the Clap, Toms, Rim or Clave?
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LektroiD



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PostPosted: Wed Aug 10, 2016 1:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

On further inspection of the schematic, the Clap may be quite difficult as it requires an obsolete BA662A VCA chip, has anyone reverse engineered this chip?
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elmegil



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PostPosted: Wed Aug 10, 2016 1:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've seen other people making related voice cards for Euro etc use 3080's in place of the BA662s.... Not sure how much other glue circuitry is required though.
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LektroiD



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PostPosted: Thu Aug 11, 2016 9:18 am    Post subject: Reply with quote  Mark this post and the followings unread

elmegil wrote:
I've seen other people making related voice cards for Euro etc use 3080's in place of the BA662s.... Not sure how much other glue circuitry is required though.


If you manage to find a schematic for any of these clones, that would be great, but I can't seem to work out how? The BA662A has 9 pins (and uses them all), whereas the CA3080 only has 8.

I have been scouring the web for the past couple of days trying to get to the bottom of this problem, without spending out on an obsolete chip for my project (which I could possibly blow whilst experimenting).

The closest I've been was a page about a Stereoping clone, which was based on the MB-808 schematic, and uses the CA3080, but the link to the schematic was dead, and no such schematic seems to appear to be available anywhere...

There was a pinout mapping here, but only mentions 6 pins, and as I've mentioned, all 9 need to be connected.

I feel I'm just chasing my tail. I'm really at a loss with this...


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elmegil



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PostPosted: Thu Aug 11, 2016 9:54 am    Post subject: Reply with quote  Mark this post and the followings unread

I believe pins 7/8/4 are a buffer like you see on the LM13700 etc. Though obviously a bit different, see below....


This might be an option too?

http://wiki.openmusiclabs.com/wiki/BA662

Has a schematic:
http://wiki.openmusiclabs.com/wiki/BA662?action=AttachFile&do=view&target=ba662_sch.png
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elmegil



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PostPosted: Thu Aug 18, 2016 9:33 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey -minus-, did you get credit on this?

http://www.808state.com/forum/topic-3095.html
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wackelpeter



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PostPosted: Thu Aug 18, 2016 11:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've built the Roland 121 VCF on stripboard some time ago and the original layout also featured some of those BA6... OTA. I replaced them with LM13700 and it worked...

The only difference will be the buffer but i have no idea what pin 4 is doing on the BA662...

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-minus-



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PostPosted: Thu Oct 13, 2016 1:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

elmegil wrote:
Hey -minus-, did you get credit on this?

http://www.808state.com/forum/topic-3095.html


I did see that and contacted The Playground. I think it was an honest mistake. They had no idea it was a strip board layout; it was assumed it was a screen grab of a drum pattern. Warren Morris, Director of The Playground was apologetic and actually offered to pay me for the use, which I happily accepted. Smile Nice to see some good people out there! So shines a good deed in a weary World...
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elmegil



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PostPosted: Thu Oct 13, 2016 4:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's quite awesome, actually Smile
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lysergist



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PostPosted: Tue Oct 18, 2016 10:08 am    Post subject:   Reply with quote  Mark this post and the followings unread

Someone for the Toms/Claves and Clap ? ^^
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elmegil



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PostPosted: Tue Oct 18, 2016 10:42 am    Post subject: Reply with quote  Mark this post and the followings unread

The toms ought to be doable, but the problem with the clap is it uses a BA662 OTA that is unobtanium. There is a clone out there you can build with discrete SMT, but I would think that's perhaps overkill.
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lysergist



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PostPosted: Wed Oct 26, 2016 12:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Lol ok i realise i already have the 808 Toms clone, the AteOhAte Toms from Hex-Inverter. I thought it was a different circuit because i'm not satisfied with the sound but i've checked the schematics and it's the same than the original. I guess the major differences are coming from the transistors.

About the clap, the Yocto uses BA6110 instead of BA662. I'll check if i can make a stripboard design based on the yocto schematic, using a BA6110.

Last edited by lysergist on Tue Nov 01, 2016 4:50 pm; edited 3 times in total
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lysergist



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PostPosted: Sun Oct 30, 2016 10:41 am    Post subject: Reply with quote  Mark this post and the followings unread

I've done a stripboard version of the Rimshot/Clave, it worked like a charm at first attempt.
At first attempt i didn't incorporate the red section, it's a muting circuit that allows signal to pass through the opamp only when triggered, it looked optionnal at first, no signal leaking hearable, but when i put the rimshot through an overdrive we could easily hear the noise source. Now i guess that's the utility of the muting circuit, that is not necessary in other voices.
So if you don't have 2SK30A or equivalent you can omit this part (with Q61, C112, C113, R305 and R327), it won't be problematic until you pass your rim through an overdrive.
Here's a short video clip with the rimshot/clave breadboarded. Now the clap and i'm complete !

https://youtu.be/TLfwnosA9js


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Last edited by lysergist on Tue Jul 11, 2017 4:45 pm; edited 16 times in total
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elmegil



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PostPosted: Sun Oct 30, 2016 11:08 am    Post subject: Reply with quote  Mark this post and the followings unread

So black is ground and yellow is -V?
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lysergist



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PostPosted: Sun Oct 30, 2016 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, edited. The components are labelled the same as the original Roland schematics to make it more readable. It's very fresh, i hope there's no huge mistake. I'll test it tomorrow.
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lysergist



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PostPosted: Wed Nov 02, 2016 9:51 am    Post subject: Reply with quote  Mark this post and the followings unread

"Normally conducting Q74 remains off only while trigger pulse is transferred from Q61 to allow IC 19 to pass signals. The switching is is provided to eliminate noise leaking from IC20 especially for CL - relatively large amount, being wired for high Q."

Ok so this part is not significant and could be easily deleted. I try the stripboard as soon as possible. I've edited the first post, there's a little video clip with the breadboarded rimshot
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azot



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PostPosted: Sun Nov 06, 2016 4:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi folks! I wonder if anyone tried to implement the closed hat decay mod?
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lysergist



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PostPosted: Sun Nov 06, 2016 9:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Closed hat decay ? Never seen this mod. By definition the closed hat becomes an open hat if you increases the decay. Do you want your closed hat being an open hat ?
There are some mods here you can check
http://www.e-licktronic.com/forum/viewtopic.php?f=18&t=143
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azot



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PostPosted: Sun Nov 06, 2016 6:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

lysergist wrote:
Closed hat decay ? Never seen this mod. By definition the closed hat becomes an open hat if you increases the decay. Do you want your closed hat being an open hat ?
There are some mods here you can check
http://www.e-licktronic.com/forum/viewtopic.php?f=18&t=143

Thank you! It seems I heard something about this mod before, but now I can not find any mention. Maybe it was about tr-606.
I'm not seeking similarity with original tr-808, I just want to animate CH within the range from very short click to the shortest OH decay without the lose of specific 'choking'. I increased capacity of C63, the discharge cap of envelope-forming Q28, added 100k pot connected to the gnd via 15k resistor in parallel with C63 (see pic). R15 sets the minimum length of decay, capacitance of C63 determines the maximum duration. Value of the pot sets the range of control.


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lysergist



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PostPosted: Sun Dec 11, 2016 12:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok now I know what you mean sorry ! Should be an easy and useful mod !
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LektroiD



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PostPosted: Tue Dec 13, 2016 7:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

lysergist wrote:
I've done a stripboard version of the Rimshot/Clave, it worked like a charm at first attempt.
I removed the RED part as it wasn't necessary, it's for the mute section.
Here's a short video clip with the rimshot/clave breadboarded. Now the clap and i'm complete !

https://youtu.be/TLfwnosA9js


Do you happen to have a wiring diagram for the switch?

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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lysergist



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PostPosted: Wed Dec 14, 2016 5:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Hope it's clear, i don't really know all types of switches names, but i can say it's a ON-ON switch. I always test it before soldering.
There's just a little gap of around 1sec when switching from clave to rimshot, i don't know why. I guess this 1 sec latency comes from a charging capacitor. I never tested a true 808 so i can't tell if it's a normal behaviour or not. No latency while switching from rimshot to clave.


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LektroiD



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PostPosted: Wed Dec 14, 2016 12:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

lysergist wrote:
Hope it's clear, i don't really know all types of switches names, but i can say it's a ON-ON switch. I always test it before soldering.
There's just a little gap of around 1sec when switching from clave to rimshot, i don't know why. I guess this 1 sec latency comes from a charging capacitor. I never tested a true 808 so i can't tell if it's a normal behaviour or not. No latency while switching from rimshot to clave.


Thank you so much for this! Switch type is DPDT

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lysergist



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PostPosted: Fri Mar 24, 2017 1:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok i finished the clap ! Sounds really nice to me. All transistors are BC547/557, i used 2CS945 and 2SA733, but there's no difference in the sound. I used cheap BA6110 i've found on ebay, and they work properly !
Maybe i'll make another version with the CA3080, but a NPN/PNP buffer needs to be added. I have also added two mods, replace R376 (47K) by a 100k pot to control the noise reverb amount, and replace the trimmer by a 10k potentiometer.


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Last edited by lysergist on Thu Oct 05, 2017 3:16 pm; edited 9 times in total
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elmegil



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PostPosted: Tue Apr 11, 2017 8:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

So.... I think R368 in your diagram is connected to the wrong side of Q73?

And there are two D68's.... the lower one near Q73 ought to be D70 I believe.
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