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CHASM REVERB

Started by deadastronaut, November 20, 2013, 12:50:02 PM

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deadastronaut

https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

mmlee

Pre-delay is usually found on studio reverbs.  It's basically the time between the dry signal and the first reflection, usually measured in ms I.E. how long it takes before the wet signal starts.

deadastronaut

yep i get that, not sure how it applies to these bricks though...
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

gtangas

hi again!

so i check the electros and all are 10uf

as i said the distorted signal fades after as few seconds.... can i swap those for another values?

deadastronaut

^ are your electrolytic caps  the right way around?...
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

gtangas

G morning DA

Yess the caps are ok and for a weeks everything worked ok. The thing start to happen a days ago...

I have to disassemble it and check the transistors and some values.... Not in the mood for it but... AAAAAAAA

deadastronaut

morning..

that's a shame, i hope you can identify the problem..

bad mosfet maybe.
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

gtangas

Maybe... I had J201 at the beginning of the build... The orders from tayda are taking almost a month to arrive to Portugal... But it was the only thing that I swap...

gtangas

solved.... bad tranny!! now its running with two J201 and everything ok again!




deadastronaut

Cool, glad you got it sorted... 8)
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

gtangas


loylo

Quote from: deadastronaut on January 27, 2014, 06:25:22 AM
when mix is at zero fully left...no reverb at all, as it should be.

@1:50

http://www.youtube.com/user/100roberthenry?feature=mhum


I definitively have a problem with the mix pot.  :-\
There is some bit of reverb when the sound is supposed to be dry. It is barely audible when I'm playing at home, but it is noticeable, even more when playing in a band context.
The pot is fine, the mix control acts the same with another pot. And there is no problem such as a soldered jump or a bad component's value.
Whereas in your video, your mix control seems to sound as it is supposed to...  ???

Quote from: deadastronaut on January 27, 2014, 06:25:22 AM
as for time 'limiting' i think thats just down to the brick itself not allowing that. 2:85s..

Your are right, the decay could'nt be adjusted, it is preset in the brick (while the BTDR-3 let us dial it). Same for the predelay.
I am close to try to dismantle the brick (like this: http://ada.graudal.dk/bdtr2/bdtr2_top.JPG) and remove some CMS resistor to make them adjustable and have those control, thanks to the russian guys who traced the brick. http://www.freestompboxes.org/viewtopic.php?f=20&t=23706&p=232607&hilit=btdr#p232607
But it is risky!  :icon_razz:

Otherwise, I've came by a version of the Tenebrion reverb modded with a "short/long" decay switch.
http://guitar-gear.ru/forum/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=29936
I don't know if changing from a 100K  to a 1K "verb" pot make the decay shorter as this schematic suggests it.

I should try to add a 100K pot wired as a variable resistor with a 1K fixed resistor at the tail, acting the same as the "verb" pot always at the max setting, as the reverb level is kinda controled by the mix pot.

deadastronaut

mad seeing inside the brick... 8)

loylo:  i have pm'd you... ;)
https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

chi_boy

So I realize the schematic is a touchy subject because of the Brazilian Incident, but is there an updated schemo to be had?  I did find the V1.6 in the other thread, but a lot seems to have transpired since that version.  This thing is just too cool not to build.

Thanks,
George
"Great minds discuss ideas, average minds discuss events, small minds discuss people." — Admiral Hyman G. Rickover - 1900-1986

The Leftover PCB Page

pinkjimiphoton

mike/haveyouseenhim burned me a board... populated tonite, wire it tomorrow... wish me luck!!

hey is there a quick easy way to test 5457's? i have a few but i am concerned one may be damaged.. they're slopping around the bottom of my junk drawer.

could i sub 2n5952's ina pinch?
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pinkjimiphoton

bugger, if i mess with it i get it to switch on, very hissy and no verb, but taking voltage measurements sometimes i can hear the reverb for a split second.

gotta try and debug some. gotta be something stupid!!!
  • SUPPORTER
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!
"try whacking the bejesus outta it and see if it works again"....
~Jack Darr

haveyouseenhim

Quote from: pinkjimiphoton on February 08, 2014, 06:15:21 PM
gotta try and debug some. gotta be something stupid!!!

Yea. Like letting some stupid Alabamian etch boards for you.   :icon_mrgreen:
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I'm sorry sir, we only have the regular ohms.

pinkjimiphoton

betting it's something stupid even for ME.

for a dumb alabamian, you had the proper number of holes in the right spots, so i think it's good old yankee lack of ingenuity.  :icon_mrgreen:
  • SUPPORTER
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!
"try whacking the bejesus outta it and see if it works again"....
~Jack Darr

haveyouseenhim

Quote from: pinkjimiphoton on February 08, 2014, 07:21:52 PM
you had the proper number of holes in the right spots

That was pure luck. I just shot it with some birdshot  :D
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http://www.youtube.com/haveyouseenhim89

I'm sorry sir, we only have the regular ohms.

pinkjimiphoton

ok.... found some bridges and some cold solder... got the thing kinda running.
i baked one chip and one 7805 so far.

got clean signal... and loud... with the volume all the way down. if i turn it up whatsoever, the brick starts motorboating like crazy, sounds like a damn airplane.
the modulation is working. i can hear it on or off. so THAT's good...

any ideas as to where to look to find the motorboating problem? i had a hell of a hum, i thought it may have been from having the 1u cap backwards... i had oriented it with + to the right originally, tried it the other way and lost the hum.

i've tried subbing the 2n5457's, no change at all, so assuming they are working. i haven't tried the 2n7000, do you think that may be the culprit?

funny... yesterday i had reverb. today, i have an airplane synthesizer. ;)

help!!! please ;)
  • SUPPORTER
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!
"try whacking the bejesus outta it and see if it works again"....
~Jack Darr