I need your help with a neovibe.

Zedmin_fx · February 22, 2009, 11:59:11 AM

Well I was sent a neo to debug, after fixing a cap that the guy had oriented incorrectly, swapping a few other things and rewireing it , it now is working but the lfo bleeds thu when the neo is switched off. so the mission is to remove the lfo bleeding and ad a led for on off.

1.What does it do, not do, and sound like? it turns on and works fine just has the problem with the lfo.
2.Name of the circuit = neo_vibe
3.Source of the circuit (URL of schematic or project) = http://www.generalguitargadgets.com/pdf/neovibeupdate.pdf
4.Any modifications to the circuit? No
5.Any parts substitutions? No
6.Positive ground to negative ground conversion? dunno
Now, using the original schematic as a reference for which part is which (that is, which transistor is Q1, Q2, etc. and which IC is IC1, IC2, C1, and so on) measure and list the voltage on each pin of every transistor . Just keep the black lead on ground, and touch the pointed end of the red probe to each one in turn. Report the voltages as follows:

Q1
C =2.1
B =1
E =1

Q2
C=4.2
B= 2.1
E= 1.5

Q3
C=11
B=4.2
E=3.7

Q4
C= 14.9
B=4.2
E=4.2

Q5
c=11.2
B=4.2
E=3.7

Q6
C=14.9
B=4.2
E=4.3

Q7
C=11.2
B=4.3
E=3.7

Q8
C=15
B=4.2
E=4.3

Q9
C=11.2
B=4.3
E=3.7

Q10
C=15
B=5.4
E5.4

Q11
C= 23.3
B=11
E=14

Q12
C=23.4
B=12
E=13.8

Q13
C=20
B=4.3
E=4.8

kurtlives · February 22, 2009, 12:02:34 PM

What type of bypass switching did you use?

Input grounded when bypassed is what I used when I built a Vibe and I have no bleeding.

Your effect is negative ground btw.

Zedmin_fx · February 22, 2009, 12:08:06 PM

The guy has a switch like this not sure where he bought it.http://www.pedalpartsplus.com/mm5/merchant.mvc?Screen=PROD&Store_Code=PPP&Product_Code=9001&Category_Code=SWI

I thought it was neg groud just cannt remember things like that so easly beeing sick and geting a headach while recording doesnt help.

Zedmin_fx · February 22, 2009, 03:11:25 PM

hmm i am going to go back and tinker whith this, to see about the lfo bleeding thing

yeeshkul · February 22, 2009, 03:36:13 PM

It has True Bypass and the signal is bleeding through the effect when the switch is off? Have you tried other switch? These cheapo DPDT are all Chinese, some of them are durable and some are complete bollocks. Measure the switch first. If it is ok, then it must be incorrect wiring. Was the trouble there before you rewired the circuit? After all, send a picture of the situation.

Zedmin_fx · February 22, 2009, 04:10:26 PM

yes, the guy said that the pedal had a really anoyying loud hum either on or off, and that he could hear the phasing while it was offalong with the hum.

I dont have the loud hum anymore, I am guessing that to be the backward cap. I could try another switch, the one I built a year ago does the same bleeding thing. I used Carling 316-B-PP stomper from sb. I will go take some pictures

Zedmin_fx · February 22, 2009, 09:17:30 PM

ok, I am back with some pics, The jacks are only temporary as he has to drill the enclosure for them.

yeeshkul · February 23, 2009, 01:19:28 AM

Hi, thanks for posting the pictures

. What is the thing that bypasses the stomp-switch? And one more question - is the DC socket plastic(isolated from the case, well now it is

)?
Try to remove all the parts from the case and check it out again.

Zedmin_fx · February 23, 2009, 08:19:29 AM

on the stomp switch? Its a 0 ohm resistor basically jumper I think they look cooler., Yea the jack is all plastic, I thought i had a pic with it in there sorry. Check what after I remove it from the case? Do you mean see if it still bleeds?

yeeshkul · February 23, 2009, 09:48:15 AM

Yes. It is getting really strange, but is must be something you have just overlooked. Remove everything from the case and check out if there is any change. If you have any other SPDT at home, even toggle, slide or whatever then try another one.

Zedmin_fx · February 23, 2009, 09:53:42 AM

ok will do, I have a 3p2t and one of the lugs came off, I used to use it as a switch for a crybaby but sold the baby.

yeeshkul · February 23, 2009, 09:58:41 AM

Good, i am courious. One thing is when the vibe is not working correctly, troubles with bypass are almost always easy to repair as far as i can say.

Zedmin_fx · February 23, 2009, 10:13:13 AM

O stupid me, I have it all wrong, The neo doesnt do the humming when the pedal is truned off. Only when you hve it on and arent playing your guitar will you hear the phasing. Gosh sorry for the stupid mistake man do I feel like a dumbass

yeeshkul · February 23, 2009, 10:17:15 AM

So the bypassed signal is clean? Just when the Neo is on you can hear the phasing? That's the way it should be

- as we know it from Hendrix bootlegs.
No troubles, it happened to me a few times

Zedmin_fx · February 23, 2009, 10:20:37 AM

yea just when we are turned on and not playing I get the phase sound, when I play it seems to go away. Hot dam I am an idiot

THANK YOU ALL SO VERY MUCH

Zedmin_fx · February 23, 2009, 10:24:02 AM

O yea Now all I have to do is add a on off led. I can do this with out having to change the switch right?

kurtlives · February 23, 2009, 12:10:19 PM

If your using millenium bypass, yes.

Zedmin_fx · February 23, 2009, 12:14:29 PM

would it be easier to add a different switch or the millenium bypass which I have no I dea what that is?

Ripthorn · February 23, 2009, 12:18:34 PM

A new switch is easier, but a millenium bypass is cheaper than getting a new switch. It is a method of using a dpdt switch for led indicator and true bypass invented by RG. Check out Geofex for the article on how to do it.

yeeshkul · February 23, 2009, 01:27:00 PM

You can add a LED that flashes with LFO and use the third row on 3PDT to "turn" the intensity pot down while Neo is off. That works fine and saves the bulb.

News:

I need your help with a neovibe.