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 Forum index » DIY Hardware and Software » Circuit Bending
Realistic Stereo Reverb System mod
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equalpyramid



Joined: Oct 09, 2010
Posts: 5
Location: Canada

PostPosted: Sun Nov 07, 2010 10:41 am    Post subject: Realistic Stereo Reverb System mod Reply with quote  Mark this post and the followings unread

I want to mod this and need some help. It uses an MN3007 BBD, and I'm wondering if I can piggy-back another MN3007 to it to make the delay longer. I heard you could basically combine 4 MN3005 chips when you mod a 3005 circuit.

Also, I want to take the power cord off and replace it with a modular synth power connection (euro or motm). Any thoughts?

Here's a pic of a similar unit:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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kjackman



Joined: Sep 05, 2010
Posts: 69
Location: Utah, USA

PostPosted: Sun Nov 07, 2010 10:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Unfortunately, I'm not qualified to help out, but it sounds cool. I'll be watching this thread Smile
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RF



Joined: Mar 23, 2007
Posts: 1493
Location: Northern Minnesota, USA
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PostPosted: Wed Nov 10, 2010 5:10 am    Post subject: Reply with quote  Mark this post and the followings unread

I can't tell you about the delay mods - but I took the board from one of these and used it in my modular.
The power supply and the circuit board were separate- it was easy to find the power supply leads. I don't recall offhand if it was bi-polar or not - but my modular power supply is + and -12 volts. I replaced the pots and jacks with thru-hole variants that I use in my modular face plates.

Good luck

bruce

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equalpyramid



Joined: Oct 09, 2010
Posts: 5
Location: Canada

PostPosted: Wed Nov 10, 2010 5:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. I'll do a bit more research before I tackle this. Increasing the delay by a factor of 2 or 4 would be a significant improvement. I'll also be adding CV to the delay.
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Lorenzo



Joined: Nov 09, 2008
Posts: 350
Location: Trieste - Italyjstan

PostPosted: Thu Nov 11, 2010 1:47 am    Post subject: Re: Realistic Stereo Reverb System mod Reply with quote  Mark this post and the followings unread

equalpyramid wrote:
It uses an MN3007 BBD, and I'm wondering if I can piggy-back another MN3007 to it to make the delay longer.


I heard something like this about my Ibanez delay, I could double the echo time "piggy-backing" a second identical chip!!
But i haven't an extra delay chip (4164-type) so I only increasing the repeat signal adjusting a trigger... O o o o ooooOOOOO0000°°°°°°° ;D

anyway I think you have to solder all the pins of the two chips together except the DATA-IN pins and DATA-OUT pins. Bend data-OUT of the lower chip away from the pcb. ... Connect this ouput of the lower chip with the input of the upper chip and connect the ouput of the upper chip with the pcb.
Sound not so difficoult ;D

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equalpyramid



Joined: Oct 09, 2010
Posts: 5
Location: Canada

PostPosted: Thu Nov 11, 2010 10:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Found some interesting related discussions:

http://music-electronics-forum.com/t19249/

http://www.diystompboxes.com/smfforum/forums.html?action=printpage;topic=40489.0

Up to 8 chips, eh? That would give 400msec of delay. If one can calibrate this properly, that would be amazing. I'll give it my best shot.
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Lorenzo



Joined: Nov 09, 2008
Posts: 350
Location: Trieste - Italyjstan

PostPosted: Fri Nov 12, 2010 3:35 am    Post subject: Reply with quote  Mark this post and the followings unread

equalpyramid wrote:
That would give 400msec of delay.


400msec is a good delay!
but sorry 400msec is not too much indeed!
I mean not so much for a bentstrument (connect 8 chips is not a joke.
maybe the game isn't worth the... chip Wink )

If a reverb has over 35ms of pre-delay it would be call Echo... and than we can call it delay.
Line-6 DL4 (digital) dalay have 800ms of pre-delay. Some stompbox' have 2 seconds of pre-delay...

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equalpyramid



Joined: Oct 09, 2010
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Location: Canada

PostPosted: Fri Nov 12, 2010 8:56 am    Post subject: Reply with quote  Mark this post and the followings unread

This particular unit was marketed as a reverb unit, but since it used BBD chip, it was always a delay unit. The way these chips work, they are horrible at replicating reverbs. If they make 50ms delays, then it is a chorus, slap-back, flanger type delay...

I just want it to be a proper long delay unit for dub stuff.
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