Badcaps.net Forum
Go Back   Badcaps Forums > Search Forums
Register FAQ Calendar Search Today's Posts Mark Forums Read

Showing results 1 to 25 of 500
Search took 0.03 seconds.
Search: Posts Made By: eccerr0r
Forum: General Capacitor Questions & Issues 06-21-2022, 08:58 AM
Replies: 6
Views: 167
Posted By eccerr0r
Re: Cleaning up capacitor leakage

Don't forget try clean water too...especially since failed capacitors tend to use aqueous (i.e. water) electrolytes and water will dissolve it once more.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-18-2022, 08:42 PM
Replies: 6
Views: 251
Posted By eccerr0r
Re: Short finder

Just need a voltage limited 1A CC PSU (LM317?) and you can read "ohms" (which would be milliohms) directly on your 200mV scale, if you have 20mV, even better.

Trick is not to have to send 1A...
Forum: General Electronics Technical Discussion 06-17-2022, 12:14 PM
Replies: 51
Views: 2,625
Posted By eccerr0r
Re: Fixing a multimeter based on VC9805 schematic

Just to be thorough, you should measure the voltage at emitter and collector, if they're about the same or within a half a volt or so and both near the voltage of your battery, then it's not the...
Forum: General Electronics Technical Discussion 06-17-2022, 11:58 AM
Replies: 51
Views: 2,625
Posted By eccerr0r
Re: Fixing a multimeter based on VC9805 schematic

what I'm saying is even if it's shorted, it has no affect on the readings you're getting - unless if your battery is dead, so you do not have root cause and there's no need for bypassing.
Forum: General Electronics Technical Discussion 06-16-2022, 04:22 PM
Replies: 6
Views: 249
Posted By eccerr0r
Re: resistors in parallel ?

Then you'll need a 1.5W 2k2 resistor which rounds up to 2W, and why not buy a 3k 2W resistor to begin with :D
With dissimilar resistors, probably only for last resort or if you have other values to...
Forum: General Electronics Technical Discussion 06-16-2022, 09:02 AM
Replies: 51
Views: 2,625
Posted By eccerr0r
Re: Fixing a multimeter based on VC9805 schematic

M6 is a power switch transistor. I'd imagine it is used to shut off the meter if the battery is bad. If it's shorted and the battery is weak, then perhaps this is why you're getting strange...
Forum: General Electronics Technical Discussion 06-15-2022, 08:04 AM
Replies: 51
Views: 2,625
Posted By eccerr0r
Re: Fixing a multimeter based on VC9805 schematic

Not exact but a 2n3906 would probably will make a workable replacement...
Forum: General Electronics Technical Discussion 06-14-2022, 07:18 AM
Replies: 6
Views: 249
Posted By eccerr0r
Re: resistors in parallel ?

Do the math.

BTW, should always do the math. You can even do funny things with nonmatching resistors but yeah it gets complicated when they don't match as the power dissipated will be different...
Forum: General Electronics Technical Discussion 06-13-2022, 09:15 PM
Replies: 6
Views: 249
Posted By eccerr0r
Re: resistors in parallel ?

And two 750Ω 1W resistors in series would also result in a 1.5KΩ 2W resistance.
Forum: General Capacitor Questions & Issues 06-12-2022, 10:34 AM
Replies: 5
Views: 237
Posted By eccerr0r
Re: Identifying capacitor type (Laserdisc PSU)

caps that look like that are usually polystyrene. If there are that many of them, they probably chose cheapest and other plastic caps will work just fine...


...though they usually don't fail...
Forum: General Computer & Tech Discussion 06-09-2022, 04:01 PM
Replies: 879
Views: 414,955
Posted By eccerr0r
Re: Post your system.......

There's someone who hasn't posted in a while... too good for us? :D
Forum: General Electronics Technical Discussion 06-08-2022, 03:54 PM
Replies: 51
Views: 2,625
Posted By eccerr0r
Re: Fixing a multimeter based on VC9805 schematic

Note that when measuring IN HI/IN LO pins, you need to use a meter with 1GΩ input impedance, else you will get significant error in the reading. If you only have a 10MΩ input impedance DMM it's...
Forum: General Electronics Technical Discussion 06-07-2022, 07:55 PM
Replies: 13
Views: 300
Posted By eccerr0r
Re: Ohms Law question - kind of ...

Indeed 0.16Ω is declared to be the minimum resistance of the load for one cell that's printed but couldn't read because the label needs to be rotated a bit...

However if 2 cells are in series,...
Forum: General Electronics Technical Discussion 06-07-2022, 10:11 AM
Replies: 51
Views: 2,625
Posted By eccerr0r
Re: Fixing a multimeter

probably prescaler has a broken resistor?
Forum: General Computer & Tech Discussion 06-07-2022, 12:46 AM
Replies: 1
Views: 246
Posted By eccerr0r
using exFAT on Android on smaller micro SD cards?

Are there any downsides to reformatting 32GB microSD cards to exFAT provided any other machines that could use this card also can read exFAT? (Mainly for using the card as the default "external...
Forum: General Electronics Technical Discussion 06-05-2022, 08:28 PM
Replies: 13
Views: 300
Posted By eccerr0r
Re: Ohms Law question - kind of ...

See you neglected that 0.16Ω printed right on the battery (which is the "ESR" or "internal resistance", and this value changes as the battery ages, per lot, state of charge, etc., etc.)! That's why...
Forum: General Electronics Technical Discussion 06-01-2022, 11:13 AM
Replies: 9
Views: 286
Posted By eccerr0r
Re: Newbie Question Schematics reference resistance measurements

In service manuals it's typical to print expected voltages near wires with an arrow or using a different color font. There is no standard for this so expecting to learn from examples, you really...
Forum: General Electronics Technical Discussion 05-30-2022, 09:18 AM
Replies: 15
Views: 1,807
Posted By eccerr0r
Re: USB "Quick" 18W charger ... protocol

I think my Asus and Oneplus, despite being QC, will also happily draw 10W from a 5V USB brick. Alas, I was more interested in how QC works as a standard USB power brick better not be outputting 9V...
Forum: General Electronics Technical Discussion 05-30-2022, 09:13 AM
Replies: 13
Views: 300
Posted By eccerr0r
Re: Ohms Law question - kind of ...

ohm's law doesn't work here only because the circuit isn't fully modeled.
ESR is being improperly ignored.
Forum: General Electronics Technical Discussion 05-29-2022, 04:00 PM
Replies: 15
Views: 1,807
Posted By eccerr0r
Re: USB "Quick" 18W charger ... protocol

QC and USB-C charging are "standards" ... but as usual, there are so many standards to choose from.
Seems Asus and OnePlus seem to use the same QC protocol and the chargers can be swapped without an...
Forum: General Electronics Technical Discussion 05-29-2022, 09:30 AM
Replies: 15
Views: 1,807
Posted By eccerr0r
Re: USB "Quick" 18W charger ... protocol

USB-C charging spec (versus USB-C connector) is better than QC2/QC3, alas yes I'm only talking about QC2/QC3 which many phones appear to still use over the USB-C charging spec, even if it has a USB-C...
Forum: General Electronics Technical Discussion 05-28-2022, 08:28 PM
Replies: 15
Views: 1,807
Posted By eccerr0r
Re: USB "Quick" 18W charger ... protocol

Hmm... knew I posted something about this before.

Just wondering if anyone did some experiments with this. As far as I can tell, at 18W with 4+ volt lithium ion cells, at 100% conversion...
Forum: Troubleshooting Audio Equipment 05-26-2022, 12:17 PM
Replies: 25
Views: 509
Posted By eccerr0r
Re: Dummy loads for amplifier fault finding

BTW typically "electronic loads" are meant for testing power supplies. It's nice they are adjustable, but unsuitable/incorrect for speaker outputs. Electronic loads are typically constant power or...
Forum: Troubleshooting Audio Equipment 05-26-2022, 07:30 AM
Replies: 25
Views: 509
Posted By eccerr0r
Re: Dummy loads for amplifier fault finding

As frequencies go up, the harder it is to make a dummy load. DC is easiest, audio slightly harder, uhf is tough, microwave is really tough...
inductance in power resistors are lower than actual...
Forum: General Computer & Tech Discussion 05-22-2022, 06:13 PM
Replies: 14
Views: 1,003
Posted By eccerr0r
Re: Best video card for 2D?

Wow...so should I be holding onto all my DX11 and older cards for those holdout W7 users out there? :D
Showing results 1 to 25 of 500

 
Forum Jump


Badcaps.net Technical Forums 2003 - 2022
Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 11:41 PM.
Did you find this forum helpful?