Electro Harmonix - Y-Triggered Filter

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Scruffie
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Post by Scruffie »

Here's a Re-Draw of the incredibly difficult to read EHX Y-Triggered Filter Schematic, The Original of which can be found here - http://sites.google.com/site/electrocon ... actory.gif

It's a simple envelope filter using EHX's favourite OTA the CA3094, hopefully i'll get round to converting this to use a more available OTA at some point in the near future though.
EHX YTF Fin.gif
Diodes are all 1N4148/1N914 the NPN transistor is a BC239 in Marks Unit and the PNPs are the complimentary of that.

(Thanks to Mark Hammer & Stephen Giles for Helping me Complete this One)

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lolbou
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Post by lolbou »

Thanks for the effort Scruffie, good job! :thumbsup
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Post by jrod »

Great job! Thanks!

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Post by borislavgajic »

thanks...but some guts?
:thumbsup

Boris

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Post by lolbou »

borislavgajic wrote:thanks...but some guts?
You porn addict... :wink:

But indeed, did you managed to get some pics for reference Scruffie?
- Are you a mod or a rocker?
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culturejam
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Post by culturejam »

Awesome!

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borislavgajic
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Post by borislavgajic »

lolbou wrote:
borislavgajic wrote:thanks...but some guts?
You porn addict... :wink:

But indeed, did you managed to get some pics for reference Scruffie?
:applause: :hug: Yes ...I am addicted......are you not :lol: :thumbsup

there should be separate thread about addicted people herer on forum

Boris

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Scruffie
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Post by Scruffie »

As you wish... Courtesy of Mark Hammer :thumbsup

(He changed one 4558 to the TL072 and One or two of the caps aren't original, but still the original values)
Attachments
YTF-labelledmirror-imagecopperside.jpg
ytf_co1.jpg

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Post by analogguru »

borislavgajic wrote:
lolbou wrote:
borislavgajic wrote:thanks...but some guts?
You porn addict... :wink:

But indeed, did you managed to get some pics for reference Scruffie?
:applause: :hug: Yes ...I am addicted......are you not :lol: :thumbsup
A "dealer" should never be addicted. Enjoy the "drugs".

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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Post by borislavgajic »

:applause: :hug: :blackeye :oops: :block:

Thanks......
and AG..you are right sir....... :thumbsup

Boris

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Post by Scruffie »

So... Mark just confirmed to me that there is no 4th Transistor in his unit and it doesn't appear to be on Analoggurus unit either... is that Factory Schematic lying a little bit I wonder?

I don't see a 10uF Tant either so do you think that last transistor (Q1) was dropped on production models? I don't really know its purpose and what is R21 about 'Out of Ckt'?

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borislavgajic
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Dipthonizer,seekwah,Talkingpedal,morleywha
...soulpreacher,dynacomp,compulator
...buzzaround,fuzzfactory,screwdriver,sho,superdouper,St-9,RogerMayer octavia,Tychobrahe octavia,paralelluniverse,string damper,slowgear
...CE-2,ibanez fL301,EH theCloneTheory
EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser....
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Post by borislavgajic »



:block:

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Post by Distortion- »

Sorry for necro-posting, but i recently bought a faulty YTF and i'm looking to repair it. Not being very experienced with electronics, I'll check som ethigns with you as I work. Is the slide switch supposed to connect to the negative of the audio input or the negative of the power input? And how important is the .1 uF cap at the same position?

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