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Search: Posts Made By: eccerr0r
Forum: General Electronics Technical Discussion Yesterday, 11:34 PM
Replies: 14
Views: 98
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 Yesterday, 10:42 PM
Replies: 14
Views: 98
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 Yesterday, 04:53 PM
Replies: 14
Views: 98
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 Yesterday, 01:03 PM
Replies: 14
Views: 98
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: 98
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: 681
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: 681
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: 681
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: 681
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: 681
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: 681
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: 533
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: 533
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: 533
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: 533
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: 533
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: 533
Posted By eccerr0r
Re: Sending PWM through a relay

People even send RF through relay contacts...
Forum: General Capacitor Questions & Issues 03-14-2020, 07:46 PM
Replies: 13
Views: 436
Posted By eccerr0r
Re: Are these for real??

wow... probably fake... they should be radial and high voltage. But if the capacitance checks out and doesn't blow up at 25V, at line frequencies it's probably not a big deal.
Forum: General Capacitor Questions & Issues 03-14-2020, 12:59 PM
Replies: 5
Views: 166
Posted By eccerr0r
Re: Which diameter is this Hitachi capacitor?

My guess is 25x45 because the capacitor looks fairly tall from the PCB. The 30x35 would look more squarish, and I'm estimating 25mm from other cues from the picture...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 03-09-2020, 11:26 AM
Replies: 14
Views: 272
Posted By eccerr0r
Re: Soldering Gun with Solder Feeder

Amen!

Kind of funny I sometimes still bend them... well, no more than two pins and no more than about 30 degrees. Then when one pin is tacked down, unbend and solder each of the remaining pins,...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-08-2020, 11:29 AM
Replies: 2
Views: 147
Posted By eccerr0r
Re: Need Help on SMPS Power Supply Load Testing Failure..:(

When all else fails, replace everything including the optoisolator :D
Forum: Equipment Usage, Soldering, Techniques, and Reviews 03-07-2020, 09:33 PM
Replies: 14
Views: 272
Posted By eccerr0r
Re: Soldering Gun with Solder Feeder

That looks like around 100-150g solder reel, so not too bad, but still, the rest of the iron has some weight on it and can cause fatigue...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 03-07-2020, 10:21 AM
Replies: 14
Views: 272
Posted By eccerr0r
Re: Soldering Gun with Solder Feeder

Talk about lazy... or rather, great for assembly line workers...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 03-05-2020, 03:06 PM
Replies: 10
Views: 298
Posted By eccerr0r
Re: Potentially Toxic Situation

It doesn't take long for a smoker to spoil with odors that will last quite a long time...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 03-05-2020, 05:20 AM
Replies: 12
Views: 462
Posted By eccerr0r
Re: Anyone build their own equipment? Plans for small benchtop power supply.

I'd think an isolation transformer wouldn't be very much more than just getting an isolation transformer...

Unless...
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