DIY Reverb: collected resources

armdnrdy · December 23, 2012, 05:57:57 PM

The signal and power ground are connected internally inside the brick so it's a bit redundent to run separate grounds. I think you have a pretty good ground path going.

FYI, the BYOC reverb doesn't separate the grounds. I've noticed no ill effects (only good effects!) in my build.

In fact, when you combine your reverb with a delay unit....you will never want to play through a delay unit without the reverb again!

It just sounds so much cooler!

deadastronaut · December 23, 2012, 06:09:41 PM

ahhhhhh of course, internal. (sound of penny dropping) ....

yeah i love delays, and verb, i usually use verb on my mixer, but it'll be nice to have control properly....can't wait to try it out.

does the mix go to full wet only?..i'd like that for nice spacey ambient stuff.

anyone rigged up 2 of these?...

deadastronaut · January 11, 2013, 06:25:47 AM

yipee i got my brick today....can't wait to get this on breadboard at last...and try those mods...

unfortunately i have to repair my cars electric window today as its stuck in the down position...typical,

, arghhhhh in the freezing cold.....bummer... $:-\$

back later...

deadastronaut · January 13, 2013, 10:55:28 AM

right, cars sorted, at last... i'm going to bread this up tonight and get it going..hopefully.

using the modded by armndry (larry) schemo..i'm going in....i may be some time...

deadastronaut · January 13, 2013, 01:30:22 PM

well it works on breadboard , first time...great...well over unity, but i'll stick a resistor on the output to bring it down to unity level...

adds a nice tone to the guitar too....

the reverb knob is fine..dry to full on reverb. tick.

the damp works fine too, from dark to bright tick.

( i'll mess with the cap on that to get it fatter to thin...)

the dwell however...hmmm... not doing much really...

heres a clip of it as it is in the schemo, before a unity adjustment ok..

first is bypassed, then on/dry, then turning up reverb.....then tweakng the 'damp'.....then the dwell...(which does nothing really to my ears)

https://dl.dropbox.com/u/7464107/reverbtest1.mp3

edit: ok had a had a tinker, think i'm going to make C7 switchable, for dark/bright. 10n/100n-220n...really nice and subtle to bright...will be great on my acoustic too.

probably lose the dwell, and swap that pot for an overall volume instead...better control etc...

deadastronaut · January 13, 2013, 05:26:26 PM

demo...

armdnrdy · January 13, 2013, 05:49:46 PM

Hey Rob,

Try lowering the 180K down to a 10K.

The circuit I pulled the Dwell from has an amplifier as a first stage and the schematic that you're working with has a buffer in front.

With that 180K the feedback signal is most likely not getting back to the input.

See if that helps

deadastronaut · January 13, 2013, 05:55:10 PM

hi larry, cheers man, i'll give that a go now...

deadastronaut · January 13, 2013, 06:00:35 PM

whooohoooo...bloody hell...mass feedback /controlled oscillation...

great!!!!!...

excellent...nce one larry.

thats amazing for a 2.8 second brick.....really streches it out.

armdnrdy · January 13, 2013, 06:05:05 PM

Great!
Now adjust that resistor to what you want it to sound like and do.

I just used 10K because it's a nice round number and it's the go to resistor! Just throw a 10K in there!

armdnrdy · January 13, 2013, 06:09:08 PM

Quote from: deadastronaut on January 13, 2013, 06:00:35 PM
thats amazing for a 2.8 second brick.....really streches it out.

Yeah, that's why it's called dwell.....like when you clap your hands in a large empty room the sound "dwells" around a bit longer than in a smaller crowded room.

deadastronaut · January 13, 2013, 06:16:35 PM

yeah thats the nuts, sounds lovely on vol swells....uber cool.

just tried it with delay...awesome.

those that like noise machines would find that mod cool too...the way it breaks up and lingers etc......

simply cool.

cheers man.

deadastronaut · January 13, 2013, 07:53:13 PM

ok had a tweak, 33k seems to be best before it goes into massive feedback...just right.

deadastronaut · January 13, 2013, 08:31:04 PM

cheers larry, got your pm, with updated schemo, cheers. having grief with my internet at the mo...

sorted:

schematic above updated.

edit: one thing i have noticed is that the tone is a fair bit brighter on the reverb compared to bypassed, which is nice, but i wil be using this with my other pedals , distortion/chorus/ delay so i'd like to retain

a bit more bypassed tone if possible....hmmmm...

more tweaking...but brlliant so far...

.....might have to just throw a 10k in there...everywhere...

deadastronaut · January 14, 2013, 08:21:51 AM

ok had a bit more of a tinker to get 'tone' unity as well as volume....pretty much bang on now.....

so basically i stuck a low pass filter on the end, i used a 47n and 22n as i didn't have a 68n in my bits...

of course this could be switchable for a bright/warm setting too...i'm really pleased how this has turned out...

its much more in line with bypass signal, when reverb is at minimum its hard to tell the difference....GREAT STUFF...this is exactly why i breadboard everything. i ALWAYS find i need to tweak those unity issues, whether tone/vol

special thanks to larry too...cheers man.

now to re-arange the pcb layout.

i'll post the layout and scheme in another thread when done, seeing as i hijacked this one ok...

deadastronaut · January 18, 2013, 06:02:25 AM

ok, ive built this on pcb. i tweaked the feedback to be more useful, i swapped the damp 22n for a 100n .

and reverb pot is 22k (uk version of the 25k). and i also added a switch to switch from normal (68n) and bright...(which this is without the 68n )

i used 47n+22n as i didn't have a 68n.

anyway its working fine, but...i have a noise problem on the volume control. (which i added to compensate for the difference between bright/normal)

the noise (high pitched fast oscillation maybe)...when vol is off or full on....any ideas?.

schematic as i have it now.

my layout (built)

could it be a power ground - signal ground problem?......HELP!

snap · January 18, 2013, 07:23:45 AM

can it be you are unbalancing the bricks output with C7? try to put that cap + pot after the joint of the two resistors from pin 5 and 6

deadastronaut · January 18, 2013, 07:47:00 AM

hmmm maybe, it was fine on breadboard though, ..famous last words eh..

cheers.

armdnrdy · January 18, 2013, 12:48:37 PM

Hey Rob,

I see a couple of things that look a bit "odd".

The 1M pulldown in parallel with the 100K "volume" control will cause the output impedance to change with the movement of the volume pot. Try putting a 470R resistor between the volume wiper and the output. Install the 1M pulldown between the 470R and the output.

The location of the bright/warm switch look a little suspect to me as well.

Try putting a 2.7K between the 68n paralleled capacitors and ground.

deadastronaut · January 18, 2013, 02:56:40 PM

hi larry, cheers man ,good to have another set of eyes on it...

ahhh yep i see the switch problem...i'll try those alterations later. cheers man.

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DIY Reverb: collected resources