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Old 5th March 2010, 02:04 AM   #21
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Quote:
Originally Posted by MJL21193 View Post
I made a mistake earlier when I said 12-24VAC, it should be 12 to 16VAC, 1 amp.
... that stings a little

I spent the better part of my shift yesterday milling a spot for a 120v to 20v transformer into the enclosure I'm fabbing together.

revision 3 here I come ...lol
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Old 5th March 2010, 02:13 AM   #22
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Quote:
Originally Posted by smokinghot View Post
... that stings a little

I spent the better part of my shift yesterday milling a spot for a 120v to 20v transformer into the enclosure I'm fabbing together.

revision 3 here I come ...lol
Sorry Jarrett,
My original had a 35V cap in that position. I changed it to 25V for economy in the kits.
20VAC would exceed the rating on the smoothing cap.
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Old 5th March 2010, 02:32 AM   #23
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no biggy... I'm just going to add a voltage divider to dail in the appropriate value.

edit: Actually, I do have some 35v caps at my disposal. Anything else besides the smoothing cap I should be concerned about, if I run it at the 20vac?

edit2: Never mind... I just checked the PCB and saw they'll all rated for 25v. Voltage divider it is...!
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Last edited by smokinghot; 5th March 2010 at 02:37 AM.
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Old 5th March 2010, 02:46 AM   #24
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Quote:
Originally Posted by smokinghot View Post
no biggy... I'm just going to add a voltage divider to dail in the appropriate value.

edit: Actually, I do have some 35v caps at my disposal. Anything else besides the smoothing cap I should be concerned about, if I run it at the 20vac?

edit2: Never mind... I just checked the PCB and saw they'll all rated for 25v. Voltage divider it is...!
If you are staying with the 20VAC transformer, it is best if you change the smoothing cap (C7) and the decoupling cap (C3) to 35V. Nothing else will need to be changed.
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Old 5th March 2010, 02:56 AM   #25
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really... just those two caps, and I'm set? Or am I still needing to get it down to a max of 16vac...?
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Old 5th March 2010, 03:00 AM   #26
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No, those are the ones that see full rail voltage. 20VAC should give ~26VDC and you are good to go on 35V caps.
Nothing else to change.
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Old 5th March 2010, 04:33 AM   #27
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Sweet...Thanks John.

I already found a C3 replacement. The 4.7mF is being more of a problem.
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Old 5th March 2010, 05:28 AM   #28
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Me again....

By chance do you have any 35v 4.7mF caps laying around john...?

Best I've got is 63v, and needless to say, it has some girth to it. Not to mention another 3/4" of length...lol.

I do have a shorter 6.8mF at 50v, but it has the same circumference as the 63v beast. I'm not sure the effect playing with the capacitance will have on the circuit. So I thought it best to continue assembly with a 35v C7 in mind.

I'm off tomorrow so the hunt will be on. Any electronic supply shops in the area you can think of?
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Old 12th March 2010, 01:04 PM   #29
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Default I can picture it finished...

John

I am planning to start assembling my jig this weekend and need some help with finishing the enclosure (great simple design by the way).

What would you suggest to somebody that is not known for his painting skills?
Since I do not have a spray gun, I need to stick with "products in a can" if you get my drift.
I am not looking for anything fancy, but want to have a nice bright color just like yours.

I thank you in advance for any advice you can provide.
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Old 13th March 2010, 12:33 PM   #30
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Hi Duda,
I used 2 products in finishing mine and both are in spray cans. First, I sanded the box really smooth - be careful when sanding not to damage the slot that holds the front and back panel.
Next I sprayed on a coat of clear polyurethane on the box, inside as well. This is the sealer coat. I let that dry overnight then sanded that smooth with fine paper the next day. Another coat (or more) of clear polyurethane as the primer coat and let that dry a few hours. Lightly sand with fine paper and you are ready for finish coats. I used Tremclad rust paint and gave it several coats, just letting it dry between coats for an hour.
Patience is key and getting the primer coat smooth means the finish will be smooth.
This can give a pretty good paint job for less than $20.
Hope that helps
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