UVICS - Univibe In a Crybaby Shell

[R.G.]

Transistor voltages usually tell the tale.

[aryk]

And they are:
Q1:C=8.15
     B=7.69
     E=8.60
Q2:C=8.55
     B=8.13
     E=8.60
Q3:C=8.59
     B=8.55
     E=8.60
Q4:C=8.60
     B=8.49
     E=8.18
Q5:C=8.59
     B=8.18
     E=8.60
Q6:C=8.60
     B=8.49
     E=8.18
Q7:C=8.59
     B=8.18
     E=8.60
Q8:C=8.60
     B=8.49
     E=8.18
Q9:C=8.59
     B=8.18
     E=8.60
Q10:C=8.59
       B=8.18
       E=8.59
Q11:C=8.60
       B=7.06
       E=8.18
Q12:C=8.60
       B=8.18
       E=8.61
Q14:C=8.60
       B=8.50
       E=8.18

Q13(MPSW45):C=8.60
                        B=8.48
                        E=8.61

Used all 2N5088 on these. Seems something is way off. I checked all caps and orientations everything is where it should be the charge pump is working as I tried it on another 18v circuit and it worked just fine. (using your bipolar power supply idea from geofex with the LT1054)

[aryk]

Oh and on the IC1 I'm getting I=8.0 G=8.60 O=8.60 ...? What the devil?

[aryk]

Also is R43 supposed to bring the 17.41v from the power supply down to 9.2v?

[RedHouse]

And they are:
Q1:C=8.15
     B=7.69
     E=8.60
Q2:C=8.55
     B=8.13
     E=8.60
Q3:C=8.59
     B=8.55
     E=8.60
Q4:C=8.60
     B=8.49
     E=8.18
Q5:C=8.59
     B=8.18
     E=8.60
Q6:C=8.60
     B=8.49
     E=8.18
Q7:C=8.59
     B=8.18
     E=8.60
Q8:C=8.60
     B=8.49
     E=8.18
Q9:C=8.59
     B=8.18
     E=8.60
Q10:C=8.59
       B=8.18
       E=8.59
Q11:C=8.60
       B=7.06
       E=8.18
Q12:C=8.60
       B=8.18
       E=8.61
Q14:C=8.60
       B=8.50
       E=8.18

Q13(MPSW45):C=8.60
                        B=8.48
                        E=8.61

Used all 2N5088 on these. Seems something is way off. I checked all caps and orientations everything is where it should be the charge pump is working as I tried it on another 18v circuit and it worked just fine. (using your bipolar power supply idea from geofex with the LT1054)

Forgive me for "chiming in" but those voltages don't look right to me, specifically Q1,2,3,5,7,9,10,11,12,13,14 all have their base at a lower voltage than their emitters (which isn't right) might check your orientation, maybe you have them in backwards?, or they could be bad, or solder bridges, etc, etc, etc.

[aryk]

Did all that twice. And 4, 6, 8, and 14 have base higher than the emitter

[R.G.]

At first glance, you have an open ground to the PCB.

[RedHouse]

Did all that twice. And 4, 6, 8, and 14 have base higher than the emitter

...

(edit) never mind, I see RG's here now so you're in good hands (if you listen to him) ...Peace-out

[aryk]

I'll upload some shots of the board here in a few. How would I go about fixing the ground?

[R.G.]

You'd get out your voltmeter, put the negative lead on the power supply end of it and then measure places that are supposed to be connected to the power supply negative by copper and solder. If these show any voltage other than 0, there is an open link between them and the power supply negative.

[aryk]

I didn't get zero at the ground   . I got about 8.60 on ground. Here are some pics:

[R.G.]

That's what I thought might happen. You have two places (power supply negative, and "ground" on the circuit) that are supposed to be connected by a wire and solder, and are not.

So use that same setup, with your voltmeter negative lead clipped to the power supply (-) and use the (+) lead to follow the power supply (-) wire through all its connections till it gets to the PCB. At some point, it will stop reading 0.0V and start reading 8.6V. That means you just passed the break.

[aryk]

It happens right after R42. I got 0 from the "C" (power negative) wire then still 0 at the north side of R42 then hit 8.5 on the south side of it

[aryk]

Found an issue. The possitive and negative are supposed to go to pad's J and K not C and D. At least that's what the note's say. The wiring diagram is different than the baby board mod instructions for using the 9v power supply. Any ideas here?
p.s. were you able to see the pics uploaded? I'm using my ipad and can't tell.

[R.G.]

The wiring diagram is different than the baby board mod instructions for using the 9v power supply. Any ideas here?

Yep. There were a few quick versions of that. Let me know *exactly* which version you're using so I can be sure I refer to the right one. Also, I tend to mess up on things like this occasionally, so it could be that I just flat got it wrong.

p.s. were you able to see the pics uploaded? I'm using my ipad and can't tell.

Nope, can't see them.

[aryk]

I'm using the updated version I believe with the baby board.  The latest one used on geofex just before the son of uvics. Wired it with a dual pot and the off board baby board. I'll try and get a working pic on here. Thanks so much for your help by the way

[aryk]

Pic:

edit: sorry forgot how to resize the images on here.

[R.G.]

Very nice, tidy build.

Do you have a pic of the daughter board? Top and bottom?

I'm trying to see if you did UVICS3 or 4. The difference is in the daughter board, mostly. Once I see exactly what you have, I can probably point you to the issue.

Right now, my suspicion, with no facts in front of me, is that the daughter/baby board is not functioning correctly and putting out 17Vdc as it should.  If you can help me verify the version, I can pick out what's wrong pretty quickly.

... I think... 

The process will probably be divide and conquer. Separate the small board from the main board, verify that it makes twice the incoming 9V correctly and fix it if it doesn't, then hook up the main board and see that it works right with the right voltage.

You're welcome to any support I can give.

[R.G.]

Yep, there is a bug on the wiring diagram on J/K versus C/D. I'll get ramped up to fix that on line as soon as we get the power issue fixed. Thanks for the catch.

[aryk]

I believe it is version 3. Didn't see a version 4? Or was that the SON OF UVICS?

Power supply and bottom pics:


I know there was a tut on how to resize these somewhere... Again sorry for taking up all this space