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haricots
Joined: Aug 15, 2007 Posts: 33 Location: guelph
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Posted: Thu May 22, 2008 1:35 pm Post subject:
Realistic Reverb |
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I need a bit of help modifying my Realistic Reverb. My intent is to replace all that I can with better quality parts and then start modifying it bit by bit.
So far I have replaced all the switches with knobs, replaced the power jack (so I can mount it to the new housing), got rid of the battery altogether and put it in an aluminum case. My next step is to replace the SPDT switch with a nicer SPST. Since I am not using batteries I have no need for the 'check battery' position on the original switch. Now the original switch is a 3 position but with an odd configuration (Off, On, battery check). Any tips on just hooking up a simple on/off switch? I also want to add an LED so that it is lit up when the unit is on.
I'm relatively new to all this having only built a few kits before. |
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Thu May 22, 2008 4:16 pm Post subject:
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I don't have any answers to your LED question but am interested- which "reverb" of theirs do you have? One with the SAD1024 or a Japanese MN? There were a couple of designs. I modded my 1024 version (which they sold as a kit in the 80s; you could walk into RS and buy 1024s off the rack) to have far slower clock rates for "echo", which of course had terrible clock noise and aliasing in the audio signal. I think that one of the resistors or the time trimpot was useful for this; I may have simply increased the range as it would go back all the way up to clean flanging etc. at one extreme.
In other words, mess with the clock circuit |
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haricots
Joined: Aug 15, 2007 Posts: 33 Location: guelph
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Fri May 23, 2008 10:29 am Post subject:
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First order of business should be to work up an NE572 (smallbear electronics) daughter board for compansion, at minimum of the in/out signal path, then for the feedback path |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Fri May 23, 2008 7:05 pm Post subject:
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Is this the little black Realistic Reverb from the early 80s?
3 or 4 sliders with the on/off/batt switch at the side?
Classic little unit that! My friends and I used one for a decade or so when we were first doing home recordings. It was THE vocal pre-amp and treatment solution for every occasion!
I've grabbed a copy of the schem, as I'd love to play around with the circuit sometime. I actually thought, in retrospect, that it would have had a 3011 in it. The fact that it's just a 3207 is quite remarkable considering the sound we used to get out of it. _________________ What makes a space ours, is what we put there, and what we do there. |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Clack
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
G2 patch files: 1
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Posted: Fri Jul 25, 2008 12:13 am Post subject:
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Hey, I just got one of theese ( well without a cover! ) in a bin at a car boot, was wondering if somone could help me out understanding a few things about the schematic?
What is the trasistor stages just before the output for? the feedback seems to come off the second stage. and it is attenuated by the repeat pot is that correct? is it therefore some kind of filter?
Ill let you know how this schematic fits with the actual product, although this is a tandy reverb. tandy being the now extinct UK branch of radioshack _________________ Clacktronics.co.uk |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Fri Jul 25, 2008 4:02 pm Post subject:
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It is quite amazing that they managed to get an effect they could label "reverb" out of an MN3207! When I first saw this schematic I was surprised that it didn't have a 3011 in it. I remember this unit having a very twangy kind of "ring" to it, so it does make sense.
So I think the reason it does what it does is because of all the filtering. The 4 transistors are all set up as inverting LP filtering stages (I think), to get rid of the clock. So there's filtering before the regen out, then more filtering before the main out, there's also some kind of filtering further down the regen path (IC4-A).
My theory isn't that great, so I'm sure someone else will give a more accurate description of what's happening. It's definitely something I'd like to play with on the breadboard. _________________ What makes a space ours, is what we put there, and what we do there. |
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anclib
Joined: Oct 12, 2012 Posts: 12 Location: UK
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Posted: Thu Apr 30, 2015 8:02 am Post subject:
realistic reverb |
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Hello I know this is an old thread, but I was wondering if someone can help me circuit bend one of these, I'm pretty much a complete novice when it comes to bending.
I've tried hooking into ic3(mn3102) with 10k and 100k pots in paralell with R30, with no luck, on further inspection I have noticed that my board seems to differ slightly to the schematic post on this thread, with R30 being connected to pin 7 on the chip instead of 6 of the schematic.
the two main things I want to add is a knob to extend the delay time and something to extend the feedback.
maybe someone has already done this and knows the exact points on the board to patch into. |
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