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Search: Posts Made By: eccerr0r
Forum: General Electronics Technical Discussion Today, 09:42 AM
Replies: 16
Views: 599
Posted By eccerr0r
Re: TO-220 exploded...estimated overload?

bring it on, gimme free BeO shoulder washers :D

It's the first part of a homemade grid tie inverter, it was a success until it melt down and desoldered itself. Due to the expected heat generation...
Forum: General Electronics Technical Discussion Today, 07:12 AM
Replies: 16
Views: 599
Posted By eccerr0r
overheating carnage

dead, dead, dead!!! Shorted D-S. Got so hot that the solder melted and disconnected itself.

Power source was solar... large solar cell...

Fortunately still have a few more IRF640s to play...
Forum: General Electronics Technical Discussion Yesterday, 09:17 PM
Replies: 11
Views: 617
Posted By eccerr0r
Re: High side Mosfet swich design

The answer is that the lower Vth devices do not help if the source voltage of the MOSFET is not referenced to ground, like the original post.

Any MOSFET on the high side has special problems to...
Forum: General Electronics Technical Discussion Yesterday, 04:27 PM
Replies: 16
Views: 599
Posted By eccerr0r
Re: TO-220 exploded...estimated overload?

Sorry, this is unrelated to the original TO-220 but rather a different one in a different usage (switch mode PSU instead of audio amplifier).

I knew it would dissipate 10+W but had a fairly poor...
Forum: General Electronics Technical Discussion Yesterday, 04:09 PM
Replies: 16
Views: 599
Posted By eccerr0r
Re: TO-220 exploded...estimated overload?

Ah crap, blew another IRF640. Overheated after hour of testing.

Where can I get shoulder washers cheap? I'm losing^H^H^H^H^H^H^H melting them left and right...
Forum: General Electronics Technical Discussion Yesterday, 01:56 PM
Replies: 26
Views: 425
Posted By eccerr0r
Re: Decorative Solar Lamp Question

I have a solar panel I wish I could repair, would be nice if it's just the interconnect but the tracks on the wafers themselves look oxidized. Should take another look at it, and without the charge...
Forum: General Electronics Technical Discussion Yesterday, 11:51 AM
Replies: 11
Views: 617
Posted By eccerr0r
Re: High side Mosfet swich design

But will that work well with a p-channel switch on the power rail that's well above 5V say 12V?

The second mosfet is there specifically for the level shifting needed to drive the p-channel. At...
Forum: General Electronics Technical Discussion Yesterday, 08:55 AM
Replies: 11
Views: 617
Posted By eccerr0r
Re: High side Mosfet swich design

Okay, finally looked at data sheet but I shouldn't have bothered: Not only that R2 needs to be on the Drain of M1, it needs to be increased to 1KΩ if V1 is really 30V.

and #@*%(#! can't get away...
Forum: General Electronics Technical Discussion Yesterday, 01:03 AM
Replies: 11
Views: 617
Posted By eccerr0r
Re: High side Mosfet swich design

Original circuit is fine with the P-channel with source to V+, that's how it's normally implemented, problem is that M1 won't saturate due to R2 - at first when the gate voltage is turned on, it...
Forum: General Electronics Technical Discussion 06-02-2020, 10:05 PM
Replies: 11
Views: 617
Posted By eccerr0r
Re: High side Mosfet swich design

Damn. I was looking for some ideas of high side switching and found this thread... grr PFET on V+ rail is low side switching. Not what I want. I want an IRF640 on the upper rail switching 150+...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-31-2020, 11:42 PM
Replies: 9
Views: 237
Posted By eccerr0r
Re: Samlex SEC-14 linear power supply 13.8VDC 10A repair

Do notice there's a 15V Zener crowbar there (you drew!). They at least tried.

If you're going to add a PSU board, you might well just drop all of the regulator circuitry and hook up the psu board...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-31-2020, 04:10 PM
Replies: 9
Views: 237
Posted By eccerr0r
Re: Samlex SEC-14 linear power supply 13.8VDC 10A repair

I suspect if you're not charging batteries, SCP is sufficient instead of full current limiting -- if all you're doing is powering radios, just need to make sure you don't fry something when you short...
Forum: General Computer & Tech Discussion 05-29-2020, 12:56 PM
Replies: 48
Views: 2,020
Posted By eccerr0r
Re: A Colossal HDD Failure

interesting...thought for the most part hard drives shouldn't kill themselves by doing that...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-29-2020, 09:30 AM
Replies: 3
Views: 147
Posted By eccerr0r
Re: Too much current from a Buck Converter

inductor gets hot
mosfet gets hot
regulation/ripple/voltage no longer in spec, ICs no longer work properly.

Ideally it was designed with some buffer space past 20A but no guarantees.

I'm...
Forum: General Computer & Tech Discussion 05-29-2020, 12:09 AM
Replies: 48
Views: 2,020
Posted By eccerr0r
Re: A Colossal HDD Failure

but he could just --repair-sector and it's no longer bad because it wasn't really bad to begin with?
Forum: General Computer & Tech Discussion 05-28-2020, 02:11 PM
Replies: 48
Views: 2,020
Posted By eccerr0r
Re: A Colossal HDD Failure

Do tell how you created exactly one bad sector, this will be interesting :D

Or is there the possibility of more damage than just that one sector?
Forum: Troubleshooting Power Supplies and Power Supply Design 05-27-2020, 03:13 PM
Replies: 12
Views: 211
Posted By eccerr0r
Re: Dead ATX power supply, please help.

nice, inductor fried itself to protect the fuse, that's a new one. Usually transistors do that.

Then again, likely there are fried transistors here after all is done and through...
Forum: General Electronics Technical Discussion 05-27-2020, 12:22 PM
Replies: 10
Views: 181
Posted By eccerr0r
Re: Repairing a heater wire in a toaster.

Yes it needs to be crimped together with a proper crimp connector and needs to be done properly. Twisting the wires together will not do, and obviously not soldering. Ideally it needs to be welded...
Forum: General Electronics Technical Discussion 05-26-2020, 06:34 AM
Replies: 26
Views: 425
Posted By eccerr0r
Re: Decorative Solar Lamp Question

I'm not sure how people came up with heat guns to deal with unsealing plastic, thermoset plastics (like epoxy) don't work that way. Even if it does release, it may become opaque and also made...
Forum: General Electronics Technical Discussion 05-25-2020, 08:25 PM
Replies: 26
Views: 425
Posted By eccerr0r
Re: Decorative Solar Lamp Question

I have a solar panel (probably 4W) likewise having issues, it appears to simply be oxidation loss from either water or simply air leaks, pretty much total loss I think as they are glued sealed and...
Forum: General Electronics Technical Discussion 05-25-2020, 08:50 AM
Replies: 10
Views: 181
Posted By eccerr0r
Re: Repairing a heater wire in a toaster.

If you insist on repairing, you have to crimp. You're probably better off using the same gauge heater element but if all else fails, just jumperring with a short piece of copper wire will do. No...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-24-2020, 08:23 AM
Replies: 9
Views: 237
Posted By eccerr0r
Re: Samlex SEC-14 linear power supply 13.8VDC 10A repair

Yes it does have short circuit protection, you drew it. The "UVLO logic" indeed is short circuit protection. You probably can easily use that circuitry or even repurpose the components there to...
Forum: General Electronics Technical Discussion 05-23-2020, 07:59 PM
Replies: 26
Views: 425
Posted By eccerr0r
Re: Decorative Solar Lamp Question

if any of it is in shade, it could drop down to 0.5V, so that could be one thing...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-22-2020, 11:05 PM
Replies: 9
Views: 237
Posted By eccerr0r
Re: Samlex SEC-14 linear power supply 13.8VDC 10A repair

IMHO:
The DNP capacitor should take the other 4.7mF capacitor on the control 22VDC rail, and that now depopulated 4.7mF capacitor can safely go down to 2.2mF. Perhaps this would be slightly cheaper...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-21-2020, 07:00 PM
Replies: 9
Views: 237
Posted By eccerr0r
Re: Samlex SEC-14 linear power supply 13.8VDC 10A repair

At least it has short circuit protection...

Also it should have fairly decent regulation (instead of just having a simple emitter follower regulator. No op amps or LM723 but it does appear to...
Showing results 1 to 25 of 500

 
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