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Search: Posts Made By: eccerr0r
Forum: General Computer & Tech Discussion Today, 11:49 AM
Replies: 22
Views: 577
Posted By eccerr0r
Re: How ca I use an SPDT 5V relay to reverse NC switch in 3.5mm jack?

Yep, I agree, OP probably should just buy one of these and be done with the problem instead of coming up with a "microcontroller can fix anything" solution... :facepalm:

Stepping back to the...
Forum: General Computer & Tech Discussion Yesterday, 01:09 PM
Replies: 22
Views: 577
Posted By eccerr0r
Re: How ca I use an SPDT 5V relay to reverse NC switch in 3.5mm jack?

Ahh I see now with that picture, these are the standard NC jacks one would buy. The key issue I'm worried about is that the NC jacks are not isolated, what you want is a NO jack that's isolated -...
Forum: Troubleshooting Game Consoles & Other Weird Devices Yesterday, 01:31 AM
Replies: 13
Views: 123
Posted By eccerr0r
Re: Battery charging / power supply switch board for a Red Rhino electric scooter

Starting to see a lot of lead acid scooters being disposed of... or are old lithium ion ones also being dumped?
Forum: General Electronics Technical Discussion 11-11-2019, 01:24 AM
Replies: 5
Views: 84
Posted By eccerr0r
Re: Substituting PNP with NPN (schematics provided)

How tight regulation do you need is another question...

I recently found out that my netbook's charger needs to be 12V. If it gets to 13.8V, it will appear to charge but not...
Forum: General Electronics Technical Discussion 11-10-2019, 11:58 PM
Replies: 5
Views: 84
Posted By eccerr0r
Re: Substituting PNP with NPN (schematics provided)

No, it won't work. You will need to use a different structure which introduces some regulation error or another structure that requires a smaller low current PNP transistor.

Using standard...
Forum: General Electronics Technical Discussion 11-09-2019, 07:35 PM
Replies: 36
Views: 298
Posted By eccerr0r
Re: Shredder very slow to start

IMHO it's ok to use the 224 temporarily as a test though long term it may not be a good idea. Make sure the diodes are good before buying anything, though the capacitor seems most suspicious.
Forum: General Electronics Technical Discussion 11-09-2019, 12:58 PM
Replies: 36
Views: 298
Posted By eccerr0r
Re: Shredder very slow to start

if D3, D4 are good, as well as ZD1, I hope it's not that yellow capacitor next to R3...
Forum: General Electronics Technical Discussion 11-09-2019, 12:38 PM
Replies: 36
Views: 298
Posted By eccerr0r
Re: Shredder very slow to start

What's the voltage at the anode of D6 when a sheet of paper is inserted?

Ah now we're getting more critical information. Too many wires going everywhere, no idea where they go...

2.5 volts...
Forum: General Electronics Technical Discussion 11-09-2019, 10:56 AM
Replies: 36
Views: 298
Posted By eccerr0r
Re: Shredder very slow to start

what's the reference point of base of transistor when you say 1V ?
Forum: General Electronics Technical Discussion 11-09-2019, 09:37 AM
Replies: 36
Views: 298
Posted By eccerr0r
Re: Shredder very slow to start

I'd also make sure the paper sensor is actually working properly too...
Forum: General Electronics Technical Discussion 11-08-2019, 08:28 PM
Replies: 4
Views: 78
Posted By eccerr0r
Re: Simplest 3S or 4S lithium ion protection circuit?

This is my super simple design, it's very, very crappy but *should* do as it was designed. Main problems are that there's no voltage calibration (voltage offsets may not be correct), drains a lot of...
Forum: General Electronics Technical Discussion 11-08-2019, 08:07 PM
Replies: 4
Views: 78
Posted By eccerr0r
Re: Simplest 3S or 4S lithium ion protection circuit?

Yeah I bought one, not exactly that because I need protection more than balancing at this point, but it's in the mail.

Was just wondering if one can be made easily in the meantime. This...
Forum: General Electronics Technical Discussion 11-08-2019, 03:04 AM
Replies: 4
Views: 78
Posted By eccerr0r
Simplest 3S or 4S lithium ion protection circuit?

Well, I ended up ordering one from china (ugh) ... probably need to pay tariff on them, but oh well... or really?

Since it will take a month before I get it, I decided to draw up a circuit using...
Forum: General Computer & Tech Discussion 11-08-2019, 02:17 AM
Replies: 10
Views: 195
Posted By eccerr0r
Re: What TRULY Renders an Operating System Obsolete?

It's always the case it's obsolete when you cannot run the application *you* want to run on it.

Unfortunately people feel it's okay to always run old software until it stops working. It's a...
Forum: General Electronics Technical Discussion 11-08-2019, 01:30 AM
Replies: 17
Views: 202
Posted By eccerr0r
Re: High resistance measurement

I take my comment back about the oscilloscope, there is a possibility you could use an oscilloscope in the normal sense. The 1MΩ input impedance would be something that you'd need to take into...
Forum: General Electronics Technical Discussion 11-06-2019, 11:01 PM
Replies: 36
Views: 298
Posted By eccerr0r
Re: Shredder very slow to start

Other possibility is that one of the resistors went open or one of the tracks broke. Some of the tracks on the bottom looks corroded or something weird is going on with them ... could they be to...
Forum: General Electronics Technical Discussion 11-06-2019, 05:01 PM
Replies: 17
Views: 202
Posted By eccerr0r
Re: High resistance measurement

Actually I think this is the way that's being described:

Equipment needed:
- 10MΩ impedance or so DMM that can also measure millivolts.
If you don't know the exact impedance of the DMM, you'll...
Forum: General Electronics Technical Discussion 11-06-2019, 12:23 PM
Replies: 17
Views: 202
Posted By eccerr0r
Re: High resistance measurement

there's a choice of either a decent amount of current (which means you'll need to deal with high voltage) or deal with tiny currents (which means you'll need to deal with high noise)... In the olden...
Forum: General Capacitor Questions & Issues 11-06-2019, 09:48 AM
Replies: 5
Views: 108
Posted By eccerr0r
Re: What are the best caps for AC coupling a video signal?

"Improve" ?

Left out too many details to make heads or tails of your query.

Normally large electrolytics are used to decouple. The way I read your query you either overdesigned or made a...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-04-2019, 09:35 PM
Replies: 1
Views: 81
Posted By eccerr0r
Re: Using a scope to see fuel injector waveform?

Just connect it as you would think it should be connected. Note that the sweep speed needs to be fairly low at low RPM so if you don't have a storage oscilloscope that slows down samples, you will...
Forum: General Electronics Technical Discussion 10-31-2019, 05:30 PM
Replies: 30
Views: 409
Posted By eccerr0r
Re: Improving a slow/fast digital clock

Note that 50ppm error is already about 30 seconds per week ... so don't get the cheap ones :)
Forum: General Electronics Technical Discussion 10-31-2019, 10:17 AM
Replies: 30
Views: 409
Posted By eccerr0r
Re: Improving a slow/fast digital clock

That thing looks like it uses a "tuning fork" crystal oscillator though you need to closely inspect it to be sure. Then go buy a bunch of them and replace them every week until you find one that's...
Forum: General Computer & Tech Discussion 10-30-2019, 02:02 AM
Replies: 17
Views: 315
Posted By eccerr0r
Re: CPU Fans - Which, when, and why

I do have to say I'm intrigued at the failure mode of the fan.

By far the most common BLDC fan motor failure I've seen is... guess what? You guessed it: bearing failure.

I think I've only come...
Forum: General Electronics Technical Discussion 10-29-2019, 10:26 PM
Replies: 3
Views: 90
Posted By eccerr0r
Re: 7 segment LED displays: Common cathode vs. common anode

The CA and CC drivers are logically equivalent to each other minus the fact one is the complement of the other. The logic is not any more complicated except the fact that humans rather think of...
Forum: General Electronics Technical Discussion 10-29-2019, 06:49 PM
Replies: 34
Views: 604
Posted By eccerr0r
Re: Matching output transistors on an audio amp?

Kind of funny, I have a MOSFET that I didn't have enough gate drive due to a crap circuit I was using. It got so hot that the plastic shoulder insulator melted and plastic goo everywhere.

Luckily...
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