Capacitors in the SN voice kit

v-un-v

Bill!! Help me. I'm drowning!!

Having got a tiny amount of time to finish this kit, I'm stumped once more on my old friend, the capacitor. Sad

The list says 8 or so disc capacitors, but I am seeing more that look like mylar than disc. Is this normal? Which is what, because they all have different markings on them. I hate capacitors! Shocked

State Machine · Posted: Fri Apr 30, 2010 5:22 am Post subject:

v-un-v · Posted: Fri Apr 30, 2010 5:27 am Post subject:

That was a nice quick return Bill. Thanks! Smile

My multimeter is a big bag of hurt at the moment! Laughing

I really need another one. (and another soldering station Sad

)

State Machine · Posted: Fri Apr 30, 2010 5:39 am Post subject:

v-un-v · Posted: Fri Apr 30, 2010 5:58 am Post subject:

v-un-v · Posted: Fri Apr 30, 2010 6:00 am Post subject:

Actually 471 x3 (there's shit written on the back too! Embarassed

)

State Machine · Posted: Fri Apr 30, 2010 8:00 am Post subject:

I believe this to be correct Tom:

102 JCE (x2)
[C6, C7]
.001 uF

R40 RDN (101 A1K) x2
[C1, C2]
100 pF

471 A1K (x3)
H23 AHP
[C3, C4, C5] (Can all be the same type, even though they are specified as disc and poly)
470 pF

473 C5K
V39 AHO
[C14]
.047 uF

Bill

v-un-v · Posted: Fri Apr 30, 2010 8:10 am Post subject:

I went out and bought a new multimeter (which I should have done in the first place), but that was after I had to use a sink plunger to re-align my eyeball after reading these things! Laughing

Cheers Bill! Very Happy

v-un-v · Posted: Fri Apr 30, 2010 9:17 am Post subject:

C16 is a BIG BASTARD! Shocked

State Machine · Posted: Fri Apr 30, 2010 10:15 am Post subject:

v-un-v · Posted: Fri Apr 30, 2010 10:43 am Post subject:

Yeah, I got it on the board....

cue the fanfare.....

Tom has finally finished a board!!! Hooray!! party!

Now I gotta decide on that PWM/6 octaves thingie. I've got a rotary switch, so I can probably do it. I've also been toying with the idea of using cakeboards as the front panels. They look totally mad too (crazy silver) Laughing

Perhaps, perhaps not, but I'm working on getting a workshop together too, at the place where I work.

Bill, this may not be of interest to you, but have you seen this crazy thing;

http://reprap.org/wiki/Mendel

The workshop would be within a school for kids with special needs (autism). I hoping to get a RepRap kit, and build it up with the kids. But all that won't be for a while yet.

State Machine · Posted: Fri Apr 30, 2010 11:22 am Post subject:

v-un-v · Posted: Fri Apr 30, 2010 1:09 pm Post subject:

Rykhaard · Joined: Sep 02, 2007 Posts: 1290 Location: Canada

MCDELTAT · Joined: Jun 03, 2011 Posts: 10 Location: Redlands, CA

Hey there bill, I'm running into a very similar problem with some of my capacitors and was wondering if you could help me out. I believe I have them all because the numbers are right, but....

I'm using the 2009 Revision "B" board.

I checked off all the ones I was certain were right on the parts list, so I've narrowed it down a bit. Only the top 5 on the parts list need to be figured out (just realized you listed the value of the 102 JCE).

Heres what it says on the parts list and following will be the codes on my caps:

C1,C2 100 pF disc
C3, C4 470 pF disc
C5 470 pF poly
C8-C12,C23,C24 0.01 uF disc

.01K (X2 , little red)
103 M50C / A909 (back) (X2, little blue)
103 M50C / A941 (back) (X3, little blue)
923AMP / 671A1K (back) (X5, little tan)

Also, if you could verify another part. U5 isn't listed on the new parts list, but I believe it is the Ki39 / LM7IL / 05ACZ / (from top to bottom). It looks like the 2N3904 with legs in a black casing.

Thanks so much for any help you can provide.

v-un-v · Posted: Sun Jun 26, 2011 10:02 am Post subject:

I knew my post would be useful! Smile

Good luck! Smile

MCDELTAT · Joined: Jun 03, 2011 Posts: 10 Location: Redlands, CA

Yes. Yes it was helpful. It helped me a get a couple of them figured out, but capacitors are really the bane of me. I only have a basic multimeter that doesn't do capacitance. I should have though about that before I bought one.

Hoping to figure them out so I can get to soldering.

magman · Joined: Feb 04, 2009 Posts: 363 Location: Liverpool, UK

I suspect that the LM7IL / 05ACZ part you mentioned is actually a 78L05 voltage regulator.

The SN-Voice needs a +5V supply for some devices, this is what the 78L05 provides.

On the Capacitors, I can give a bit of guidance that may help.

for the caps that start 103, this stands for 10 with 3 extra zeros, so 10,000. This is actually measure in Picofarads, so this equates to 10,000 pf, or 10n or 0.01uF. I believe the A codes are actually data codes from when they were manufactured (2009, weeks 09 ,and 41). These are probably ceramic capacitors from your description, a more modern design than the older brown disks (and probably a better quality)

Regards

Magman

State Machine · Posted: Mon Jun 27, 2011 5:37 am Post subject:

Thanks guys. I was away in Boston and was not on the internet much. Seems like the questions have been answered! Thanks very much Magman. That is correct BTW, the device described is the voltage regulator. Thanks also for explaining on how to read the capacitor values. I should really not assume everyone is expert on how to ID the parts and should include a cheat sheet of some kind with each order.

Bill

MCDELTAT · Joined: Jun 03, 2011 Posts: 10 Location: Redlands, CA

Yes thanks for that explanation. I stumbled upon a capacitor calculator that had that same explanation.

My problem still exists however. See if the your description is correct then: the blue caps and my red caps (listed above) satisfy C8-C12,C23,C24 as 0.01 uF caps.

But then.... I have 5 of the same cap (or so I can read on their tiny case) that represent different values, both 470pF and 100pF.

Should I look to make sure that they actually aren't the same?

EDIT: Solved the problem. With a fresh set of eyes (I was looking at them around at 9:50 PM last time) I used my magnifying glass to read out the labels on the 5 tan ones. Sure nough, 3 had 471 (47 with 1 leading zero, 470pF) and 2 had 101 (10 with 1 leading zero, 100pF).

Thanks for your help guys, now to finish up the build.