Vox - Repeat Percussion (V 809) [schematic]
- analogguru
- Old Solderhand
Information
A self-proclaimed "All-Knowing Guru" is offering a "corrected" schematic of the Vox Repeat Percussion here:
https://www.diystompboxes.com/smfforum/ ... c=38473.40
There is at least one thing what the self-proclaimed "All-Knowing Guru" doesn´t know:
His schematic neither original nor is it correct - so it is more a fake.
For comparision purposes here is the (wrong) original schematic
and as FSB birthday present No. 2 is here a traced (and for this reason really correct) and tested schematic:
Vox - Repeat Percussion schematic
Happy birthday FSB,
analogguru
https://www.diystompboxes.com/smfforum/ ... c=38473.40
There is at least one thing what the self-proclaimed "All-Knowing Guru" doesn´t know:
His schematic neither original nor is it correct - so it is more a fake.
For comparision purposes here is the (wrong) original schematic
and as FSB birthday present No. 2 is here a traced (and for this reason really correct) and tested schematic:
Vox - Repeat Percussion schematic
Happy birthday FSB,
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- MoreCowbell
- Transistor Tuner
Information
I would DEFINITELY recommend buying several 2N2646 UJT's to try out in this circuit. Some will make the tremolo work great, others won't work at all.
- borislavgajic
- Opamp Operator
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- Posts: 1542
- Joined: 27 Feb 2008, 14:23
- Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
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.... - Location: Sombor , Serbia
- Has thanked: 131 times
- Been thanked: 277 times
Mine works just great....Thank You mister Guru for the schematic............
- Attachments
-
- V809 Repeat Percussion vox.rar
- (42.08 KiB) Downloaded 384 times
- Dirk_Hendrik
- Old Solderhand
Information
Thank you m'r Boris
Would it be an option to download pdffactory pro, at http://www.fineprint.com/, and use the trial version to prit that layout as a PDF, saving the non-expresspcb users that hassle of installing expresspcb???
But nevertheless, thanks! Good to see people not going the vero- road (no flame intended at any vero leyouters )
Would it be an option to download pdffactory pro, at http://www.fineprint.com/, and use the trial version to prit that layout as a PDF, saving the non-expresspcb users that hassle of installing expresspcb???
But nevertheless, thanks! Good to see people not going the vero- road (no flame intended at any vero leyouters )
- borislavgajic
- Opamp Operator
Information
- Posts: 1542
- Joined: 27 Feb 2008, 14:23
- Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
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.... - Location: Sombor , Serbia
- Has thanked: 131 times
- Been thanked: 277 times
Thank you Mr Dirk
I will follow your sugestion
it is a good advice...
... I post the express PCB file also,so people could modify layout,traces.....
the summer finaly begins!
Greetings to all nice people on this forum!
I will follow your sugestion
it is a good advice...
... I post the express PCB file also,so people could modify layout,traces.....
the summer finaly begins!
Greetings to all nice people on this forum!
- Attachments
-
- ExpressPCB.pdf
- (6.47 KiB) Downloaded 545 times
-
- vox pcb.pdf
- (8.9 KiB) Downloaded 674 times
- RnFR
- Old Solderhand
Information
thanks boris! been dyin to get this one goin.
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic
Blog-APOCALYPSE AUDIO
Blog-APOCALYPSE AUDIO
- borislavgajic
- Opamp Operator
Information
- Posts: 1542
- Joined: 27 Feb 2008, 14:23
- Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
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.... - Location: Sombor , Serbia
- Has thanked: 131 times
- Been thanked: 277 times
Don't you die man!!!
I added little SW and now have 3 cap's ( electrolytic)-switchable in place of 10mF.....try smaller valyes(0.47mF....2,2mF) cap......so there is kind of ring modulator sound possible in high speeds
It is recomended to put socket's for tranny's so you could experiment ............
when I connect phaser there was ticking ....but just put input cap 2,2mF
that is all ......
I added little SW and now have 3 cap's ( electrolytic)-switchable in place of 10mF.....try smaller valyes(0.47mF....2,2mF) cap......so there is kind of ring modulator sound possible in high speeds
It is recomended to put socket's for tranny's so you could experiment ............
when I connect phaser there was ticking ....but just put input cap 2,2mF
that is all ......
Thanks all!!
Newcomer to this forum here.
I have the RP on my breadboard right now ( has been there for 6 months or something), constructed from various schems floating around and it works.
But it'll be nice to see how it sounds constructed from a true known good schem.
What's more, I've build quite a few pretty complex boxes and can handle the electonic side of things but doing layouts scare me.
This Lo for the RP is just what I need, thanks again Boris!
Best!
Pelle
Newcomer to this forum here.
I have the RP on my breadboard right now ( has been there for 6 months or something), constructed from various schems floating around and it works.
But it'll be nice to see how it sounds constructed from a true known good schem.
What's more, I've build quite a few pretty complex boxes and can handle the electonic side of things but doing layouts scare me.
This Lo for the RP is just what I need, thanks again Boris!
Best!
Pelle
- theehman
- Diode Debunker
Information
I originally made a corrected schematic using what turned out to be an incorrect 2N2646 layout. If you read further you'll find that I discovered the error and corrected it, offering the corrected schematic once again. It was traced from an actual unit except for my 2N2646 orientation.analogguru wrote:A self-proclaimed "All-Knowing Guru" is offering a "corrected" schematic of the Vox Repeat Percussion here:
https://www.diystompboxes.com/smfforum/ ... c=38473.40
There is at least one thing what the self-proclaimed "All-Knowing Guru" doesn´t know:
His schematic neither original nor is it correct - so it is more a fake.
For comparision purposes here is the (wrong) original schematic
Yes, I'm sure that one works, however, I've been using the newest corrected version for my Trem-O-Matic pedals since I started building them and it works fine. You're also welcome to download it using the link at the DIY forum, Mr. "self-proclaimed guru" .analogguru wrote:and as FSB birthday present No. 2 is here a traced (and for this reason really correct) and tested schematic:
Vox - Repeat Percussion schematic
Ron Neely II
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
- analogguru
- Old Solderhand
Information
This I can´t believe, since it is still incorrect:offering the corrected schematic once again. It was traced from an actual unit except for my 2N2646 orientation.
The mistake is in the 820 Ohm resistor which in a real unit is 82k....
The difference between 5k6 and 4k7 is not so important
I already downloaded it, for this reason I knew that it is wrong...You're also welcome to download it using the link at the DIY forum...
...maybe yes, but for sure not the "All-Knowing" one......Mr. "self-proclaimed guru".
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- theehman
- Diode Debunker
Information
analogguru wrote:This I can´t believe, since it is still incorrect:offering the corrected schematic once again. It was traced from an actual unit except for my 2N2646 orientation.
The mistake is in the 820 Ohm resistor which in a real unit is 82k....
The difference between 5k6 and 4k7 is not so important
What I did was scan the original Vox schematic again and modify it. Apparently I forgot to adjust the value of R7 this time which should be 82K, as you pointed out. Thank you for correcting me, however I wish you had just emailed me about it. I'll make the correction once again and upload it to my site.
Ron Neely II
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
- analogguru
- Old Solderhand
Information
Above this components is written: MOD like "modification".
The componenent numbers are identical to the original (below) and would replace them.
analogguru
The componenent numbers are identical to the original (below) and would replace them.
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- Chugs
- Resistor Ronker
I just built a Repeat Percussion from AG's schematic. It's a cool sounding pedal. I have noticed, however, that there is a bit of a volume drop with the pedal engaged. Is that normal?
- analogguru
- Old Solderhand
Information
You can reduce the value of the 3k3 emitter resistor (R13) to compensate for that.
analogguru
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- theehman
- Diode Debunker
Information
Chugs wrote:Great. I shall try that. Thank you.
Try a 1.5K on the emitter.
Ron Neely II
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs
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- Posts: 27
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- my favorite amplifier: Fender Super 60 or Teisco Checkmate
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I built this from the schematic too, and also noticed the volume drop.
A 1.5K on the emitter seems to only let the oscillator work in a very small range of the speed pot, so i presume something a bit larger? 2.2k?
Also...the depth knob acts more like a master volume, is this correct?
A 1.5K on the emitter seems to only let the oscillator work in a very small range of the speed pot, so i presume something a bit larger? 2.2k?
Also...the depth knob acts more like a master volume, is this correct?
Any tremolo-like device (this is one, just an odd kind of LFO) can be either cut-only, boost-only, or cut-and-boost with it's amplitude variation.
Boost-only doesn't get out much, as it doesn't offer the fade-to-quiet on the down variations.
Cut-only tremolos work by offering only reductions of level from the normal level. This causes an apparent loss of volume, because your ear hears the up-and-down volume variations and senses the lowered volume times as a reduction in overall volume.
Cut-and-boost tremos inherently hold the same "average" volume level, and are therefore simpler to deal with in a live playing setting. The volume doesn't go down when you hit the footswitch. But the circuit complexity of cut-and-boost is significantly more than cut-only circuits.
Cut-only plus a fixed boost is the compromise which happens a lot in the effects world. The repeat percussion does this style. The UJT and modulation transistor cut the incoming signal level; the transistor amplifier boost it back up to help make up for the apparent cut in levels. Cut-only-plus-fixed-boost can only approximately compensate for the change in apparent level. Changing the depth parameter also requires a change in the boost to make it come out the same apparent level. Works OK if you don't need to change depths while you're playing.
Boost-only doesn't get out much, as it doesn't offer the fade-to-quiet on the down variations.
Cut-only tremolos work by offering only reductions of level from the normal level. This causes an apparent loss of volume, because your ear hears the up-and-down volume variations and senses the lowered volume times as a reduction in overall volume.
Cut-and-boost tremos inherently hold the same "average" volume level, and are therefore simpler to deal with in a live playing setting. The volume doesn't go down when you hit the footswitch. But the circuit complexity of cut-and-boost is significantly more than cut-only circuits.
Cut-only plus a fixed boost is the compromise which happens a lot in the effects world. The repeat percussion does this style. The UJT and modulation transistor cut the incoming signal level; the transistor amplifier boost it back up to help make up for the apparent cut in levels. Cut-only-plus-fixed-boost can only approximately compensate for the change in apparent level. Changing the depth parameter also requires a change in the boost to make it come out the same apparent level. Works OK if you don't need to change depths while you're playing.
- Chugs
- Resistor Ronker
I just built a second Vox Repeat for a friend who is a BIG Spaceman 3 fan but the speed pot only works in a small part of the pot's range and then, at the fast end of the pot's range, the effect stops "repeating" completely. I tried a couple of different 2N2646 transistors but that didn't seem to make much difference. Does anyone have an idea as to what could be causing this problem?
Is this the same problem you had dperry? I used 3k3 on the 2nd transistor's emitter as per the schematic.
Is this the same problem you had dperry? I used 3k3 on the 2nd transistor's emitter as per the schematic.