Ersatz Verben - PT2399 pseudo reverb

Original effect designs complete with verified schematics, layouts and instructions. All project were freely contributed by members and cannot be used for commercial purposes without consent of the respective owners of the copyright.
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culturejam
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Post by culturejam »

earthtonesaudio wrote:If you take the LED outside the feedback loop (i.e. output of the op-amp -> resistor -> LED -> ground) it will work.
Nice. I actually thought about this after I posted. :thumbsup :hmmm:

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Post by briggs »

culturejam wrote:
earthtonesaudio wrote:If you take the LED outside the feedback loop (i.e. output of the op-amp -> resistor -> LED -> ground) it will work.
Nice. I actually thought about this after I posted. :thumbsup :hmmm:
I once designed a sort of overdrive/compressor using that technique. It works quite well if you find the right type of LEDs...
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Post by culturejam »

I was thinking that typical chap diffused LEDs usually have the lowest forward voltage and would work best. I'll have to give it a try tonight or over the next few days.

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Post by briggs »

^^ Diffused low current red LEDs are the ones I went for, with a fairly reactive LDR for the gain reduction in the opamp...

Why not use a 386 chip instead of the bazz fuzz? They provide enough current to light the LDR well, with a variable resistor in series with the LEDs you'll get some control over the depth of the pitch bending and levels of the clipping...
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Post by culturejam »

briggs wrote:Why not use a 386 chip instead of the bazz fuzz?
I was trying to avoid ripping off the Clarinot so directly. :lol:

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Post by briggs »

culturejam wrote:
briggs wrote:Why not use a 386 chip instead of the bazz fuzz?
I was trying to avoid ripping off the Clarinot so directly. :lol:
oooopps, I didn't realise that used a 386! I need to check these things before I open my gob :slap:
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Post by newly »

rocklander wrote:had a quick crack (unverified) at a layout too (hope that's okay).. also 1590a.. and it's off the first schematic..

layout
ersatz_v1-4-schem-layout1.0(c).jpg
pcb
ersatz_v1-4-PCB 1.0.jpg
expresspcb file
ersatz-verben-pt2399-reverb-1590a.zip
Is this layout verified? My build doesn't produce verb sound...well just to confirm before i started my trouble shooting.

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Post by rocklander »

not by me... (hence the 'unverified' bit)
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Post by lego4040 »

Image my etch and attemp at this circut

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Post by lego4040 »

Population has begun :applause: ImageImage cannot wait

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Post by culturejam »

My 2-sided layout is now verified.

Attached is a photo taken with my iPhone. Big camera batteries mysteriously died. :hmmm:

cheapverb_pcb1.jpg

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Post by Kunfuz »

Ok, someone somewhere, i think it was guitarmageddon, posted a mod to krank up the delaytime, but I cant freakin find it :x
Was it just double the value of tha timepot, or am i completely off here?

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Post by Kunfuz »

Edit without editbutton: use a 50K pot (not 10K) for the time! Thanks guitarmageddon Ben!
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Post by audioguy »

Kunfuz wrote:Edit without editbutton: use a 50K pot (not 10K) for the time! Thanks guitarmageddon Ben!
Any negative impact on the overall sound?

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Post by culturejam »

audioguy wrote:
Kunfuz wrote:Edit without editbutton: use a 50K pot (not 10K) for the time! Thanks guitarmageddon Ben!
Any negative impact on the overall sound?
As with just about any delay, the longer the delay time, the more noisy/lo-fi the repeats are.

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Post by Seiche »

"oh noes, my crap-fi delay has noisy repeats. who would've thought?"

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Post by p_wats »

I love where this is going, guys! I might have to try that vero layout from a page back.

Great circuit CJ! If you end up with any more boards for it I'm definitely game.

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Post by audioguy »

culturejam wrote:
audioguy wrote:
Kunfuz wrote:Edit without editbutton: use a 50K pot (not 10K) for the time! Thanks guitarmageddon Ben!
Any negative impact on the overall sound?
As with just about any delay, the longer the delay time, the more noisy/lo-fi the repeats are.
Right right- I was just curious how crunchy it got- but in the time that it took me to type this, I could have swapped the pots and found out myself!

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Post by allesz »

Seiche wrote:"oh noes, my crap-fi delay has noisy repeats. who would've thought?"
:lol: :lol: :lol:

Last week I went to the reharshals with my ad9 (a reissue) instead of the crap-fi and, well, there is some difference in the quality of sound. On the plus side we should say that, since this effect works with super short repeats the quality is quite good thought.

By the way, it is a little off topic but, I have a ring modulator with oscilations and a wite noise generator that is not so good for playing the blues.... maybe I sould switch the caps to better quality ones, I don't know.... :hmmm:

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Post by audioguy »

just finished this one and its a little dark, rolls off a lot of high ends. I swapped C7 and C1 for .047, not much help. Should I try smaller, or is this just going to be dark?

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