toppobrillo triplewavefolder DIY- interest in 2nd run?

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would you be interested in ____?

PCB only
42
38%
PCB and all PCB-mounted parts
70
63%
 
Total votes: 112

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xi-bot
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Post by xi-bot » Fri Aug 19, 2011 12:06 pm

got a note now - thanks
was worried it got lost

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jarvis
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Post by jarvis » Sat Aug 20, 2011 6:26 pm

Just got mine. One question already: what are the trimmers for and what is the correct procedure for adjusting them? Can't find it in any of the docs.

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toppobrillo
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Post by toppobrillo » Sat Aug 20, 2011 6:55 pm

the trimmers: one (the furthest from the power connects) is for "offset" and the inside is for "symmetry". the BEST way to calibrate it is with a clean bipolar 10vp-p triangle as your input source and with a scope. I realize alot of folks dont have access to a scope, so youll have to use your ears.
step 1 is adjust the offset while montoring the output. start with the 1st section. ie patch the test signal into in1a and monitor out1. trim the offset so that the signal is centered a about ground (assuming an ideal test signal) next, trim the symmetry for that section for vertical symmetry. be sure the bias control is all the way down as well as the all control. u may have to go back and tweak the offset slightly after the symmetry. repeat for sections 2 and 3.

if you dont have a scope around, you can still get really close with your ears. theres really no "wrong" way to set it up anyways.. the way i set them up for perfect symmetry. you can add asymetry with any offset at the input.
so by ear, same procedure except youll be listening for odd harmonics. the idea is to trim out any assymetry (both pots affect this, offset to a much subtler degree, but its audible) so start with symmetry, trim the even harmonics out as much as possible, then use offset , then go back if u need to. remember also that any offset at output 1 will create a little assymetry at input 2.. so take them in order.
the trimmers shouldnt have to be tweaked very far either so if you find you gota go all the way ccw or cw with them, somehing is up.

anyways, its really quite simple once u start doing it, maybe ill post somenphotos and addnthis to the page.

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sduck
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Post by sduck » Sat Aug 20, 2011 9:43 pm

Thanks! I've also been curious about the trimmers. I don't feel much need to wack mine around, as the thing sounds pretty twangy as it is already.
flickr cloud of sound touyube NOT A MODERATOR ANYMORE

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frozenkore
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Post by frozenkore » Mon Aug 22, 2011 1:24 pm

Got mine yesterday, thanks!
Cheers!
Brian

active
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Post by active » Mon Aug 22, 2011 6:11 pm

just got my board in NYC today! along with 2 dual 281s! thanks topp!

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negativspace
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Post by negativspace » Mon Aug 22, 2011 6:48 pm

Got all of my boards today, 281s and TWFs. Thanks, Josh! :party:

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decaying.sine
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Post by decaying.sine » Tue Aug 23, 2011 6:15 pm

Got my TWF's. Thanks Josh.
Brian
"I must create a system or be enslaved by another mans; I will not reason and compare: my business is to create." William Blake

"Vactrols ringing, Dude." "Thank you Donny"

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PF
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Post by PF » Wed Aug 24, 2011 6:18 am

Got the boards today.

Thanks Josh

loydb
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Post by loydb » Wed Aug 24, 2011 10:39 am

Arrived, thanks!

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falafelbiels
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Post by falafelbiels » Mon Aug 29, 2011 7:50 am

Found em in the doorstep yesterday. Thanks Josh!

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brother303
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Post by brother303 » Mon Aug 29, 2011 9:18 am

Hm,

still nothing arrived here in Germany... :hmm:

Any German wiggler received his boards?

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Greg
Peake wrote: DIY is all about the backlog. If you don't have a huge backlog, you aren't trying hard enough.

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rosch
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Post by rosch » Mon Aug 29, 2011 9:28 am

nope, not yet. i'll post here as soon as it comes in!

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robotfunk
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Post by robotfunk » Mon Aug 29, 2011 10:19 am

found it in the mailbox yesterday returning from a holiday. Thanks from Amsterdam

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brother303
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Post by brother303 » Mon Aug 29, 2011 1:26 pm

Hi,
rosch wrote:nope, not yet. i'll post here as soon as it comes in!
Thanks Rosch.

Regards
Greg
Peake wrote: DIY is all about the backlog. If you don't have a huge backlog, you aren't trying hard enough.

auftauchend
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Post by auftauchend » Mon Aug 29, 2011 3:20 pm

ach ja, the famous deutsche post...
nothing arrived in berlin so far.
lets hope its not the catgirlsynth-vs-deutschepost syndrome..
:roll:
but i sadly have no time for building it now anyway...so i´m patient.
greetings

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toppobrillo
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Post by toppobrillo » Thu Sep 08, 2011 1:14 am

no boards yet in berlin?? If youve paid and not yet received boards please PM me.

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rosch
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Post by rosch » Thu Sep 08, 2011 1:54 am

yo here also no TWF so far (germany), but i'm sure they'll show up. there have been some huge US-germany shipping delays this year i've not observed in the past. but in the end everything arrived.
fingers crossed 8_)

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falafelbiels
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Post by falafelbiels » Thu Sep 08, 2011 3:24 am

There seem so be some pads for smt parts on the solder side of the PCB. What would they be for?

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negativspace
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Post by negativspace » Thu Sep 08, 2011 8:07 am

Decoupling capacitors. (If it's the same as the 281/2, 0.1uF.)

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falafelbiels
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Post by falafelbiels » Thu Sep 08, 2011 8:53 am

negativspace wrote:Decoupling capacitors. (If it's the same as the 281/2, 0.1uF.)
Of course, let' see if I still have some.

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xi-bot
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Post by xi-bot » Mon Sep 12, 2011 8:36 am

i received my twf and 281 pcb's in germany ;-)
(guess the where send beginning of august)
thanks a lot !!!
there was a big customs sticker on it - so i guess this also caused some delays
its strange that i always receive my letters with rare parts from hongkong without any problems and delays
with other overseas shipping i can calculate at least one month

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rosch
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Post by rosch » Wed Sep 14, 2011 2:50 am

mine arrived today! thanks!
also a sticker says customs had some kind of fun with it.
i'll have more :hihi:

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rosch
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Post by rosch » Sat Sep 17, 2011 5:15 pm

i got a question:
in which order are the pins of the transistors? after soldering them i tested one on my multimeter and it seems mine are reversed.
i couldn'tr find a schematic, so it's maybe better i ask before taking them all out again.

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toppobrillo
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Post by toppobrillo » Sat Sep 17, 2011 5:45 pm

in which order are the pins of the transistors?
the 3906 pinout is EBC

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