cool reverb apart from switch spdt 'pop' issue

[samhay]

The Zener isn't especially crucial in this application - it is to prevent the FET getting zapped by the outside world, and the input buffer aught to prevent that.

[deadastronaut]

ahh brilliant..thanks man.

just added it to the schemo..i'll give it a whirl then.  hopefully were sorted!.

[deadastronaut]

right, done that, used a 2n7000 / 2.2k on source....it works and stops the bypass feedback osc etc...

but there is a teeny little tick when reverb goes on..

however switchig to bypass seems to be totally tickless.

heres a clip of what i mean, at the end of the clip as the note fades i'm switching on/off all the time..silence.

https://dl.dropboxusercontent.com/u/7464107/testverbtick.mp3

pulldown resistor maybe?

[samhay]

I'm guessing, but it might help if you make R11 smaller.

[deadastronaut]

aha...by jove i think we have a tickless switch...


i used my resistor sub box...took it down to 100k...still a tiny tick..

down to 56k..gone!!!!! whoooooohoooooooo...excellent..thanks a bunch man, i owe you a beer or 1000..

i'll test it out some more, before i get too excited,  i have mass delay on the reverb so i can hear any tick repeated loudly and it seems fine at the mo...

i''l try a test recording...

edit:

seems really cool...no noise so far...sounds awesome ( not a word i use often ) ..this is with mix fully wet.

https://dl.dropboxusercontent.com/u/7464107/reverbticktest.mp3

i fancy i'll build 2 of these buggers eventually....one for pure ambient, other for normal verb stuff..nice

[samhay]

excellent

[mth5044]

As a spectator since the single digit pages, I have to say I'm releaved this is worked out. You guys put some serious time and brain power into this. Congratulations! The circuit sounds fantastic.

[R O Tiree]

Matthew - have you checked out chromesphere's youTube vid of this circuit? It's luvverly

[deadastronaut]

@matthew: yeah its been a real  pita and headache, but very well worth it...thanks to sam's patience..and a lot of rejigging on breadboard/schematics

here is my check list of stuff to do today:

hi/lo switch:  no longer needed. check.

osc/normal switch: no longer needed as it will osc nicely on 33k-82k anyway . check.

: try different fets (rather than use up my precious j201's up) .........to do

: try a tone control,   rather than damp. (which works fine, but as i have it on breadboard might as well experiment a little ) .........to do

: check buffered bypass against true bypass for any tonal differences......to do.

: cook poached eggs in baguettes, have a coffee, and feed the cat. ....to do now.

was playing around last nght with the verb with phaser/chorus and delay after...chorus and phaser sounds great on trails , which got me thinking about lfo modulation on the verb....arghhhhhhhh i hear you scream!!!!.

just a thought though...

[BuGG]

was playing around last nght with the verb with phaser/chorus and delay after...chorus and phaser sounds great on trails , which got me thinking about lfo modulation on the verb....arghhhhhhhh i hear you scream!!!!.

Rather than built in modulation, what about an effects loop for the wet signal?  

That would be priceless.  

[deadastronaut]

hmmm yummy.    good idea.

[samhay]

Musical modulation may be difficult-to-impossible. The tricks used for modulation of single PT2399s wiggle either the delay resistance or Vb voltage IIRC. Neither of these are possible with the BTDR-1/2 as there are no decay or Vb pins.
However, there is a new BTDR-3 brick (search over at the other forum), which has a variable decay/depth option that one could wobble. Not sure if this is similar to the feedback arrangement that the current circuit uses or whether it allows the delay of the one of the PT2399s to be tweaked.

You could modulate the feedback relatively easily (essentially put a tremolo in the feedback path).
I guess you could also try modulating the supply voltage of the BTDR, as this will probably cause all manner of weirdness. You could use an LM317 and wobble its control resistor(s). This sounds like an easy way to fry a brick, but might be worth a try - will put on my list.

Oh - and there is already an LFO in the BTDR bricks, which is why you can just about hear a modulation in the wet effect.

[deadastronaut]

hmmm interesting...don't fancy frying my brick though..

buggs idea might be cool though. effects loop on the wet. then lob anything through it.


edit:

this is meant to be with the newest verion brick..hmmm.....not impressed....no tails, no full on wet hall/osc etc etc.....ok if your into rockabilly stuff i guess,  ..just not for me.
http://www.youtube.com/watch?v=zcUPjeFNMWE#t=813

probably fun to mess with the brick though...and squeeze the living daylights out of it..

edit:

this inverting/non inverting lark..wouldn't a phase switch on the output sort that?...kid of like this. (which i used for a diy sustainer flipping coils)

[Jdansti]

For your buffer, try a Tillman preamp. It's a little more boost than you might have been considering, but you've already got a volume control to tame it. It could be made to work with other JFETS than a J201. Tillman originally used a 2N5457, but he found the J201 to be less noisy.  I used the Tillman in my Pulsinator and it worked great.

http://www.till.com/articles/GuitarPreamp/

[deadastronaut]

cheers john, buffers sorted...

am tinkering with the fet switch (ians slowed down) ones..to make them quicker.

as there is a slow rise and fall effect when switching over..but having good results so far...tinker tinker..

any comment/opinion on the 'phase' switch ?..(to make it invert / non inverting)

[samhay]

I have never seen a phase inverter like that in a stompbox, and I think your idea needs one side of the ground to be floating.

[deadastronaut]

hi sam, yeah pretty crude, it worked on my diy sustainer for fundamental/harmonics , was just curious to see if it could be applied to this...hmmm..

anyway i figured why i had a sudden fall when switching.......sorted.

[Jdansti]

Rob- I'm ordering parts to build this puppy. Are you still using the BTDR-2H?

Edit: just realized that H stands for horizontal.

What I meant to ask is are you using short, medium, or long?

(Sorry-I read at a few pages of the thread, but didn't read all 34. )

[deadastronaut]

hi john, yeah its the BTDR 2-H L  long.....as long as this thread, and the time its taken to sort it.....but totally worth the time and trouble..

the only problem is i go to tweak it and just end up playing for ages.....now that's a sign of a goodun, it'll be a permanent resident on a board for sure  !!

[loylo]

I also have a question about the Belton brick.
I made a mistake during my last order and I received a BTDR-1.
Could a BTDR-1 be used in your circuit and/or other circuits designed around a BTDR-2?

There are two output pins on the BTDR-1 but I can't find any information on the internet whether those are two true outputs like the BTDR-2 (for stereo application for example) or not.