Re: This is NOT a naive question at all - cfraser

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Re: This is NOT a naive question at all

Posted by cfraser (A) on August 22, 2002 at 22:33:51

In Reply to: Re: This is NOT a naive question at all posted by cktc on August 22, 2002 at 21:26:31:

OK, just making sure at least *I* hadn't lost context of the previous posts.

I do not have an open DI/O before me, so I'll speak in general terms, the best or easiest way to do it are up to you. I decided the easiest way was to pull the digital board and build around it, rather than removing parts etc., but that doesn't matter, just so you know I haven't done this within the DI/O form factor.

Note I use common, rather than ground, because it really isn't ground in the DI/O (another story).

First, you must isolate the transformer input to the main DI/O PCB from the DI/O common, before and after the L1 chokes. You may leave one end of C2 to common, but may want to adjust it later. C1 is fine the way it is. So you have the wallwart transformer connections to the inline L1, through L1, and out of L1, not connected to common by any DC means on either side of the choke, isolated. Once you do that, the rest is easy, and that first part may have been easy too. CR1 is removed, and all the other non+5V supply stuff too, I guess you've already done that. The bridge input is connected to the two connections from the output of chokes L1, the bridge outputs are connected across C3/C4, polarity as appropriate.

The easiest way to isolate components is by cutting a PCB trace with an X-acto knife.

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Follow Ups Full Thread

Topic - DI/O Jensen transformer mod - need PS advice - kfaiman 14:35:56 08/20/02 (13)

Re: DI/O Jensen transformer mod - need PS advice - cfraser 14:52:47 08/20/02 (12)

Forgot to mention - cfraser 15:09:53 08/20/02 (11)

Re: Forgot to mention - kfaiman 17:45:11 08/20/02 (10)

Re: Forgot to mention - cfraser 20:23:04 08/20/02 (9)

Re: Forgot to mention - cktc 00:01:48 08/22/02 (7)

Doh! You can't, you have to use a bridge - cfraser 19:43:17 08/22/02 (6)

Re: one more naive question ... - cktc 20:17:50 08/22/02 (5)

This is NOT a naive question at all - cfraser 21:16:53 08/22/02 (4)

Re: This is NOT a naive question at all - cktc 21:26:31 08/22/02 (3)

Re: This is NOT a naive question at all - cfraser 22:33:51 08/22/02 (2)

Re: Thank you (nt) - cktc 23:58:01 08/22/02 (1)

I hope it doesn't sound too discouraging - cfraser 00:14:04 08/23/02 (0)

Re: Forgot to mention - kfaiman 21:41:10 08/20/02 (1)

Follow Ups

Re: This is NOT a naive question at all - cfraser 22:33:51 08/22/02 (2)

Re: Thank you (nt) - cktc 23:58:01 08/22/02 (1)

I hope it doesn't sound too discouraging - cfraser 00:14:04 08/23/02 (0)

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