X

 

We would all owe you a debt of gratitude if you were to sketch up a schematic and post it here.

 

can I do this test at no load?

Some converters have a minimum load specified, below which they will not operate correctly.
This also applies to some linear regulators.

 

So anyway while I was testing the prototype I just connected the output of a wall wart to the input of the bridge.

Is this Wall Wart DC output or AC output? If DC then why are you running that through a bridge? Forgive me if I'm in error, but are you talking about a bridge rectifier? If so then DC is running through two diodes, each dropping about 0.6 volts for a total drop of 1.2 volts. If your DC/DC module needs 5V you're only putting in 3.8V (assuming the WW is putting out 5V).

From there power splits between two of those isolated 1 watt DC-DC modules

ONE WATT? At 12V, 1W is 83 1/3 milliamps. What are you hoping to power with that low a power rating?

 

Sorry, I don't think you're focusing.

It's hard to focus with your rambling discourse and no schematic.

 

If a12V wall wart input is dropping to 4.5V you have a serious short somewhere.

Bob

 

Look this is a component question. I can't even put power on these modules and they're blowing up REGARDLESS OF BRAND WITH NO LOAD. I'm sorry for the lack of docs but the situation I'm in is maddening, and the "support people" won't talk to me because I'm not a recognized customer with a website where they can click on the link and run my corporate financial statistics! How in hell did our industry degenerate to THIS?
- The "wall wart" is just a DC model with 12 volt output out of my surplus box. IT'S NOT PART OF ANY DESIGN!!!!

Industry is much bad. Back in Latvia no website no potato. Have you tried put diode on output? Don't lick load or toad, no wall wart.

 

Powering anything with an unknown wall wart is a poor choice if you hope to gain useful information. You have already seen that. If you are actually hoping to come up with a functional design then you need to start with some actual data and that includes voltages and currents. And if your design intends to use the filament winding of an amplifier power transformer, then at least start out with a 6.3 volt transformer, not some wall wart, which might be DC or AC or ????? AND draw a circuit on paper with a pencil, and ID all of the parts as far as value, or at least a part number. Then take a picture of it so that the circuit fills the whole picture. Then you can post that. OR, at least an adequate circuit description.

 

I'm sorry for the lack of docs but the situation I'm in is maddening

Maddening for us too because we sincerely want to help. But without ANY sort of documentation we can do nothing useful but guess.

the "support people" won't talk to me because I'm not a recognized customer with a website where they can click on the link and run my corporate financial statistics!

Are you sure that's the reason why they won't talk with you? We're "Trying" to support you in this project as well. But with the lack of information - - - .

If you go to the doctor and ask what's wrong with you without presenting any symptoms or showing a bruise or other evidence - he may conclude there's nothing wrong with you. Or may conclude you're a hypochondriac.

Draw a picture. Snap a picture of it with your cell phone. Email it to your own address. Then post the picture using [ Attach files ]. Then we can begin to help you sort out the problem.