harp
Badcaps Veteran
Last Activity: Today, 02:06 PM
Joined: 06-05-2022
Location: 45.2,14.4
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few software to try... https://khandishnetwork.net/2020/07/...ftware-update/ -
According to this guide https://winraid.level1techs.com/t/gu...ogrammer/32948 the exact error is based on bad connection, or from wrong software. So, in case of ch341a, there is plenty different software available, so check that, say, asprogrammer 1.4 or so... but, I'll do resolder and cleaning just for sure... pin #3,7,8 are 3.3v connected in programer....
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With that shape, size and power of soldering tip, you should be sure to double check with dmm that each chip leg is not connected with other... flux easily burn at hi temp and make tin connected/ glued with thin lines where was once be... barely you can see it if is all clean. So why you dont use a cheap soldering iron, if you can buy from internet?Leave a comment:
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That message is poped up after migration from .com to .co.uk domain I think, sorin announced to know about forum problem, so I wait... message about ban is showing at the time now, but ban is set automaticaly for unknown reason. I was not noty
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On Sorin yt channel is a few videos about repairing acer nitro 5, so check it. Maybe to check 5v if you say that usb not working... see https://m.youtube.com/watch?v=Ruwvhcf0oLwLeave a comment:
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Yes, the problem is, that I see text formatted in quick edit box... but as soon I posted, it eat all formatting and add some garbage after hash sign... I cant edit later. But, who cares that "forum" works only in new browser, the forum, aka news group, bare text, point on sharing information, knowledge... I posted the same article on Sorin forum, and on eevblog forum: https://www.eevblog.com/forum/testge...ar-psu-review/ ... but from some reason I can not visit sorins forum anymore... so sad that tehnology is fall apart......
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I hear when is running, when not open in few hours, about 12 min is on interval and 15 min is off. But that is not telling me much?Leave a comment:
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I think it is not the termostat problem. Cooling element (sensor placed on ice, not metal) shown -12 deg.C, but only a few centimeters above in height over it, it shown 0 degC and on top of freezer chamber about 12 -15 degC... that runs for few weeks from now no changed... I seal front dor of freezer, but no change. Temperature at certian point is not drop significaly.Leave a comment:
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in freezer ice and positive temperature
I have old small fridge (gorenje about 1970?) and previous it was working ok (claims). I clean it, and find that "gas sensor pipe" hanging around loosely in fridge area... I do nothing about that. few days later after cleaning and drying complete, I powering on, and it start cooling... I measure temperature in fridge area... thinking it is everything ok. But, after a few hours, it not power off at any time, and temperature are very low for fridge, about 1 deg.C on mesh. So, I conclude that sensor is faulty, and pull it out, and test it in another freezer. If is put on ice, he switch...
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If you have some sort of measuring device you can measure noise, el. pollution etc from almost any electronic device which is around you or you are in their field, say, sattelite scanning and communication, meteorological, navy, military radar swipes, mobile phone towers, wifi, bt, gps, mobile, laptop, network rails, microwave, cars, industry... generaly all modern electronics that impact on you (in term of absorbed radiation) maybe much more then energy produced by noisy led lamp on mains. So, I realy dont see the point of that kind of health protection.Leave a comment:
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You can find a plenty of "universal laptop charger" that on one cable has interchangable tip... I see that can buy with 90w laptop charger or on usbc cable....
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Sorry, I forgot that badcaps has problem with formatting...Leave a comment:
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UNI-T UTP3315TFL-II (2025) Linear PSU review
Review of UNI-T UTP3315TFL-II (2025) 30V 5A linear PSU A laboratory power supply is one of the essential devices a DIY hobbyist should have, whether built or purchased. The internet is full of schematics from experienced electronics engineers showing high-quality power supplies with various features that differ from commercial products. In my case, I also used various "adapters" — power supplies from different devices such as mobile phones, laptops, and similar — sometimes combined with Chinese voltage and current control modules. While doing that, I was also gathering schematics... -
Thank you, I salvaged one AZ432 (1.25v) from scrap electronic and make one device with it. Now I dont have similar component and try to somehow hack any common stuff, generaly any cheap component that can buy on holex.hr shop.Leave a comment:
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What is common used real reference ic for low voltages?Leave a comment:
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can LM317 be used as a 1.25V reference
can LM317 be used as a 1.25V reference and how? I connect adj to gnd and on output a 100k pot... if I change resistance, output also change, nothing near like stable voltage... -
Maybe he measure value from original element... while power on. Or experimental, try and error...
Many people may have the desire to help, but in reality, you are on your own — do not attempt a repair until you fully understand what you are doing and how you are going to achieve it.”...Leave a comment:
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A thermocouple sensor is made of two wires of different materials welded together at the tip. When the tip is heated, a small voltage is generated at the wire ends due to the potential difference between the materials used. This voltage is then amplified and processed.
With a thermistor, a special material is used that changes its resistance depending on temperature (and it always has a significant resistance), but it does not generate voltage. The video describes a way to obtain the desired voltage at the sensor (required by the controller) by using a voltage divider made of two...Last edited by harp; 05-27-2026, 01:14 PM.Leave a comment:
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Which voltage is present at the gate of the input MOSFETs; if it is the same as at the source, the MOSFET will overheat, work with instability on load and high voltage drop. Must be 5-6V higher if N type, the input and output voltage on mosfets must be nearly the same....Last edited by harp; 05-27-2026, 11:13 AM.Leave a comment:
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