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Search: Posts Made By: eccerr0r
Forum: General Electronics Technical Discussion Yesterday, 10:40 PM
Replies: 25
Views: 261
Posted By eccerr0r
Re: Isolation Transformer Build - Technical Questions

Ah interesting, I would have thought the low cost units should be using EI cores as they're much cheaper to wind. Toroids, these are kind of tough...
Forum: General Electronics Technical Discussion Yesterday, 08:42 PM
Replies: 25
Views: 261
Posted By eccerr0r
Re: Isolation Transformer Build - Technical Questions

That's really fancy having a toroid transformer inside! Or does it?
Having a huge toroid transformer would cost a pretty penny due to the costs of winding such with a really heavy core...
Forum: General Electronics Technical Discussion Yesterday, 03:35 PM
Replies: 25
Views: 261
Posted By eccerr0r
Re: Isolation Transformer Build - Technical Questions

Is this isolation or just step? Autotransformers change voltage but do not provide isolation.

BTW a UPS powered by an isolated power supply is isolating. Another way to get an "isolation...
Forum: General Electronics Technical Discussion 04-05-2020, 05:23 PM
Replies: 25
Views: 261
Posted By eccerr0r
Re: Isolation Transformer Build - Technical Questions

Overbuilding = using an oversized/at least proper sized ... but especially properly designed core for the transformer!!! At most a overcurrent fuse somewhere, but that's all!

You do NOT want or...
Forum: General Electronics Technical Discussion 04-05-2020, 12:22 AM
Replies: 25
Views: 261
Posted By eccerr0r
Re: Isolation Transformer Build - Technical Questions

What about leaving it plugged in idling with no load? That's also "use"... You may need automatic cutoff if it's underdesigned and starts heating up.

Ultimately if you're only using it for short...
Forum: General Capacitor Questions & Issues 04-04-2020, 03:04 PM
Replies: 20
Views: 869
Posted By eccerr0r
Re: Improving CRT geometry by upgrading capacitors

It runs... save the environment: use till it breaks, then fix it, and use it some more until the cathode is contaminated and the heater burns out...
Forum: General Electronics Technical Discussion 04-04-2020, 02:03 PM
Replies: 25
Views: 261
Posted By eccerr0r
Re: Isolation Transformer Build - Technical Questions

Transformers should never get hot on average when being used. If it's getting hot with normal use, it's underdesigned...

So the question is how are you planning to use it...
Forum: Troubleshooting Power Supplies and Power Supply Design 04-02-2020, 12:58 AM
Replies: 12
Views: 147
Posted By eccerr0r
Re: Velodyne SMPS, power transformer

Chances are, the IR2153 is fried too.
Forum: General Electronics Technical Discussion 03-31-2020, 11:34 PM
Replies: 14
Views: 150
Posted By eccerr0r
Re: Modifying SMPS input voltage range

LM317 the maximum input to output voltage is ~37V -- since your output is 12V, you can be almost 50V in, tops. Just don't short the output, its self preservation won't kick in.

You can add a...
Forum: General Electronics Technical Discussion 03-31-2020, 10:42 PM
Replies: 14
Views: 150
Posted By eccerr0r
Re: Modifying SMPS input voltage range

However, multiplexing reduces brightness because it would be ⅛ what it would have been at 100% duty cycle. Only way is if the LED elements are normally much brighter than regular LEDs, and now...
Forum: General Electronics Technical Discussion 03-31-2020, 04:53 PM
Replies: 14
Views: 150
Posted By eccerr0r
Re: Modifying SMPS input voltage range

I'm surprised those meters only draw 15mA, LEDs are usually more hungry than this. You can bet an ICL7107 and 4x7-seg uses quite a bit more power.

Also the isolation that's necessary is between...
Forum: General Electronics Technical Discussion 03-31-2020, 01:03 PM
Replies: 14
Views: 150
Posted By eccerr0r
Re: Modifying SMPS input voltage range

Not clear but have to assume the panel meter is not isolated.

The load board probably can take a wide range of voltage input, with a minimum of probably 11-12V to be able to saturate the MOSFETs. ...
Forum: General Electronics Technical Discussion 03-30-2020, 10:43 AM
Replies: 14
Views: 150
Posted By eccerr0r
Re: Modifying SMPS input voltage range

Changing the input voltage is likewise dependent on how the circuit is designed much like the output. The wide range SMPS likely is either running too much current in the primary at low voltage, or...
Forum: General Computer & Tech Discussion 03-19-2020, 09:47 AM
Replies: 56
Views: 721
Posted By eccerr0r
Re: OMFG, I have real internet!!

Kind of funny - this reminds me of something in the old Qwest days (I didn't write Qworst because back then, it was fairly good unlike now.)

I've always been downloading large multi GB files, even...
Forum: General Computer & Tech Discussion 03-18-2020, 08:54 PM
Replies: 56
Views: 721
Posted By eccerr0r
Re: OMFG, I have real internet!!

Wired or wireless?
If you're not testing with Ethernet direct connections, you need to remove the randomness of wireless bandwidth.

I found my crappy Centurylink connection is fairly consistent...
Forum: General Computer & Tech Discussion 03-18-2020, 12:32 PM
Replies: 56
Views: 721
Posted By eccerr0r
Re: OMFG, I have real internet!!

They better give me *free* upgrade to 40Mbit+ if it ever comes around here... They don't even need to give me a new CPE, I already have :\

Grrr... F**K Centurylink.
Forum: General Computer & Tech Discussion 03-18-2020, 10:28 AM
Replies: 56
Views: 721
Posted By eccerr0r
Re: OMFG, I have real internet!!

It's the "horseshit" fees that I'm talking about (along with taxes, but that's another thing), these things have been adding up over time. Nevermind what they said their pricing is, they tack on...
Forum: General Computer & Tech Discussion 03-18-2020, 09:34 AM
Replies: 56
Views: 721
Posted By eccerr0r
Re: OMFG, I have real internet!!

What about the random $0.50 fees they add month by month? I think my price went up bit by bit over the years, probably $10 to $20 per month since first negotiated. It's gotten to the ridiculous...
Forum: General Computer & Tech Discussion 03-17-2020, 11:12 PM
Replies: 56
Views: 721
Posted By eccerr0r
Re: OMFG, I have real internet!!

F**K centurylink, price keeps going up and I can't even get 1MB/sec.
Forum: General Electronics Technical Discussion 03-16-2020, 10:25 PM
Replies: 42
Views: 580
Posted By eccerr0r
Re: Sending PWM through a relay

I also worry about the halogen bulbs whether they need cooling for longevity?

Anyway agreed, that's another thing I notice about re-purposing toaster ovens as reflow ovens is that the insulation...
Forum: General Electronics Technical Discussion 03-16-2020, 09:54 AM
Replies: 42
Views: 580
Posted By eccerr0r
Re: Sending PWM through a relay

When dealing with 120V 25A (3KW) circuits it's best to consider 240V across-both-phases for new design to reduce I*R losses.

Honestly after reading this thread and doing some analysis I'd stick...
Forum: General Electronics Technical Discussion 03-15-2020, 06:19 PM
Replies: 42
Views: 580
Posted By eccerr0r
Re: Sending PWM through a relay

Yeah, I was wondering about that, I suspect the SSR's I pulled from dead devices are of low current rating and thus do not have heatsinks. But a 1KW+ heater in a reflow oven, unless you're running...
Forum: General Electronics Technical Discussion 03-15-2020, 06:11 PM
Replies: 42
Views: 580
Posted By eccerr0r
Re: Sending PWM through a relay

I suspect there would be some point a hybrid relay as described would make sense to use as both subunit relays need to carry full load without damage, but such device would add significant cost to...
Forum: General Electronics Technical Discussion 03-15-2020, 05:52 PM
Replies: 42
Views: 580
Posted By eccerr0r
Re: Sending PWM through a relay

Probably because SSRs are "the thing" since it's newer and quieter, but I do wonder about losses. I probably suspect newer SSRs are possibly using MOSFET switches nowadays but even them and those...
Forum: General Electronics Technical Discussion 03-15-2020, 12:09 PM
Replies: 42
Views: 580
Posted By eccerr0r
Re: Sending PWM through a relay

People even send RF through relay contacts...
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