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Search: Posts Made By: eccerr0r
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 01:21 PM
Replies: 38
Views: 947
Posted By eccerr0r
Re: Is my Laptops Hard Drive on it's Way Out? (4 Year Old Samsung ST1000LM024)

I use until they die... of course backups are paramount and only error read rate determines replacement...

That is, only out of warranty drives. If under warranty, then they get replaced right...
Forum: Troubleshooting Game Consoles & Other Weird Devices 12-02-2020, 10:47 AM
Replies: 46
Views: 6,162
Posted By eccerr0r
Re: Post your worthless and/or pointless repairs

Yeah well this is the pointless and worthless repairs thread after all!

At least I don't need to buy another electric knife anymore and finally can say I made something "worthwhile" that was truly...
Forum: Troubleshooting Game Consoles & Other Weird Devices 12-01-2020, 06:47 PM
Replies: 46
Views: 6,162
Posted By eccerr0r
Re: Post your worthless and/or pointless repairs

After a few years of not knowing what to do, I fixed my electric carving knife - the kind with two reciprocating blades.

One of the two (nylon?) plastic "connecting rods" broke. I had tried...
Forum: General Electronics Technical Discussion 12-01-2020, 10:42 AM
Replies: 6
Views: 143
Posted By eccerr0r
Re: Magnetic Stirrer Project Reset

the positioning of your coils are probably not ideal for the pill. The magnetic fields visible to the pill are everywhere, unlike a real stepper where the fields are very compact and close to the...
Forum: General Electronics Technical Discussion 12-01-2020, 10:33 AM
Replies: 14
Views: 231
Posted By eccerr0r
Re: Magneto voltage limiter

Localized DC regulation is probably your best bet. The grounding/return wire you'll have to isolate it from your own "ground."

LEDs are good because they inherently use less power, so you can...
Forum: General Electronics Technical Discussion 11-30-2020, 09:31 AM
Replies: 6
Views: 143
Posted By eccerr0r
Re: Magnetic Stirrer Project Reset

Use two STK stereo audio power amplifier modules, chinese clones will work too. This is your "linear amplifier". To make it easier to understand, use the two amplifiers inside each of the modules...
Forum: General Electronics Technical Discussion 11-29-2020, 07:19 PM
Replies: 14
Views: 231
Posted By eccerr0r
Re: Magneto voltage limiter

need OP to reply but usually magneto means no field coil, and without a field coil, the need for a battery is gone... Since everything is AC, it'd make it more difficult to also power with DC from a...
Forum: General Electronics Technical Discussion 11-28-2020, 11:25 AM
Replies: 14
Views: 231
Posted By eccerr0r
Re: Magneto voltage limiter

back to back zener diodes is an AC limiter and should work as you need but it's an immense power waste.

If you really want no power waste you need to go through a lot of circuitry -
1. Convert AC...
Forum: General Electronics Technical Discussion 11-27-2020, 05:52 PM
Replies: 9
Views: 133
Posted By eccerr0r
Re: Need to create a circuit with a linear relationship between Vin and Vout

After looking at the scale of the initial waveform something is indeed messed up even for N-channel as the threshold voltage hasn't been reached though subthreshold leakage may be occurring.

I'd...
Forum: General Electronics Technical Discussion 11-27-2020, 01:47 AM
Replies: 9
Views: 133
Posted By eccerr0r
Re: Need to create a circuit with a linear relationship between Vin and Vout

Actually I think his waveform is correct ... sort of ... for how he simulated it, providing the model used in the schematic indeed is a p-channel device.

The waveform is really bad and shows...
Forum: General Electronics Technical Discussion 11-26-2020, 09:19 PM
Replies: 9
Views: 133
Posted By eccerr0r
Re: Need to create a circuit with a linear relationship between Vin and Vout

Well you seem to be married to a method at the moment. I can only guide you through that path now.

The hint of what you're asking for, well, aren't audio equipment supposed to be linear to...
Forum: General Electronics Technical Discussion 11-26-2020, 04:23 PM
Replies: 9
Views: 133
Posted By eccerr0r
Re: Need to create a circuit with a linear relationship between Vin and Vout

You're using a p-channel schematic drawing again for the n-channel irf520...

Based on what you're doing here (https://badcaps.net/forum/showthread.php?t=90330), you have absolutely no advantage to...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 11-26-2020, 03:12 PM
Replies: 38
Views: 947
Posted By eccerr0r
Re: Is my Laptops Hard Drive on it's Way Out? (4 Year Old Samsung ST1000LM024)

Dang I'm still using a hard drive that has lots of sector reallocates, and still using it.

Give your old HDD to me, I'll happily use it!
Forum: Troubleshooting Power Supplies and Power Supply Design 11-26-2020, 01:11 PM
Replies: 9
Views: 309
Posted By eccerr0r
Re: Does power supply have to have metal case?

However, concentrated 1KW RF pointed directly at a person could do something... :D
Same could be said about connecting 120VAC and passing 8 amperes...

Fear of the unknown. RF, wireless...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-25-2020, 12:34 PM
Replies: 12
Views: 431
Posted By eccerr0r
Re: Thoughts on this power supply kit

I really should mod my homemade bench PSU to be more efficient, not only for efficiency but to stop frying the pass transistor...
Forum: General Electronics Technical Discussion 11-16-2020, 02:54 AM
Replies: 4
Views: 117
Posted By eccerr0r
Re: How to correctly measure a mixed low&high current

I think the easiest to understand jig is using a LNA with the 0.22 ohm resistor to bring the range into something you can accurately measure with the scope and you simply ignore the regions that go...
Forum: General Electronics Technical Discussion 11-15-2020, 09:10 PM
Replies: 4
Views: 117
Posted By eccerr0r
Re: How to correctly measure a mixed low&high current

Yes this is normal due to the limitations of the scope, in what you're trying to do.

You'll need to design a jig for extending the dynamic range of your current measurement.
Forum: General Electronics Technical Discussion 11-14-2020, 08:37 PM
Replies: 14
Views: 280
Posted By eccerr0r
Re: Weirdness with a filtered PWM through a coil

He probably programmed the driver to both source and sink current, so yes this should work as long as the RC delay is shorter than the desired low frequency cycle time... much shorter...

Scope of...
Forum: General Electronics Technical Discussion 11-14-2020, 04:28 PM
Replies: 14
Views: 280
Posted By eccerr0r
Re: Weirdness with a filtered PWM through a coil

You're dealing with the unpredictable gain of the transistor around its threshold and will be tough to do without a feedback system, perhaps with an op amp. Unless you have special needs I'd say do...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-13-2020, 05:17 PM
Replies: 12
Views: 431
Posted By eccerr0r
Re: Thoughts on this power supply kit

Remember you still need beyond the meters:

- heatsink
- Transformer

Probably should work well enough, and as said, you have schematic, you can fix. And the capacitors are running at 100Hz so...
Forum: General Electronics Technical Discussion 11-10-2020, 05:14 PM
Replies: 20
Views: 474
Posted By eccerr0r
Re: Remote garage door opener - not working

While the meter is too slow to measure the voltage it should still have a little bit of RC filtering and give *some* voltage...

BTW to take out the effect of the series resistor, what is the...
Forum: General Electronics Technical Discussion 11-10-2020, 01:18 PM
Replies: 20
Views: 474
Posted By eccerr0r
Re: Remote garage door opener - not working

Something still doesn't make sense, i'd expect the voltages on the "working" one to have different voltages on B and E, and neither 0V - unless you can't see it.

Pin 7 appears to be an LED output...
Forum: General Electronics Technical Discussion 11-09-2020, 03:41 PM
Replies: 20
Views: 474
Posted By eccerr0r
Re: Remote garage door opener - not working

I'm not sure you can measure the voltage on that transistor, it's part of the RF electronics. In any case the readings you gave are suspect, especially when you gave "C" twice on the bad one. ...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-07-2020, 11:29 PM
Replies: 2
Views: 176
Posted By eccerr0r
Re: Mains inverters with 55 Hz output frequency

If you're not sure, go halfway!
Forum: Troubleshooting Audio Equipment 11-03-2020, 11:19 AM
Replies: 8
Views: 205
Posted By eccerr0r
Re: 6p3p*2 Class A valve amp - put the wrong valves in - it's broken...

Well what failed? What broke? What smoked? That's where the forensics should start.

It's audio frequencies and the caps, unless they're too close to a hot tube, should last a while.

Design...
Showing results 1 to 25 of 500

 
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