Re: List of Bad Cap Manufacturers
Caps labeled FOAI FZL 470uf 6.3v and 25v in a Motorola SB6141 cable modem bought in 2015. Started having T3 errors.
just opened it yesterday and found this:
I replaced all the swollen and non swollen FOAI caps and it seems to be working better now....
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Re: Regarding switching Power supplies
what is everyone's opinion of what this guy did?
[url]https://youtu.be/JL4FS4QOd0M[/url]
his webpage pointed out something I had to immediately check. That the output filter caps were of a voltage over the maximum output you set with the pot.
in my case they are 25v.Re: Regarding switching Power suppli... output filterLast edited by flinx; 09-17-2020, 12:35 PM.
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Re: Regarding switching Power supplies
I would be curious to see if they make these power supplies and sell the same power supply under several voltages and just change the sticker on the side. Some of mine are adjustable up to 5 volts up or down from the factory.
The 15v one (that's what it was sold as) I have could only be adjusted down to 14.96 as I got it, but up to 21.38
I could see them selling it as a 15, 16, 18 or 20 volt supply.
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Re: Need help with Low voltage protection circuit
if anyone cares here is a video of the device being tested under load to cut off.
[url]https://youtu.be/tkce2S1gxYA[/url]Re: Need help with Low voltage prote...e2S1gxYA[/url]
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Regarding switching Power supplies
I has a question (obviously).
Looking for answers from people who have real world done this.
These ubiquitous power supplies that are everywhere.
I have several and they are somewhat adjustable. I have recently learned that they can be modified to be adjustable from a pretty low voltage up to a voltage higher than they may be sold as putting out.
In my case I have one that says it can do 15vdc at 40 amps or 600 watts.
In fine print it says not to exceed 80% rated output continuously.
It could be adjusted from 14.96 to...Last edited by flinx; 09-15-2020, 02:27 PM.
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Re: Need help with Low voltage protection circuit
Alright!
I hooked the dustbuster and circuit up to a 15v somewhat adjustable switching power supply that can put out 40 amps and set it for 16v.
It started up just fine and ran fine. I dropped the voltage as low as I could but not low enough to hit the cut off I set.
Voltage did not dip too much when it started up (that I could tell). I did not have an amp meter on it, but I know it pulls at least 11 amps.
After about maybe one minute my thermal camera showed the mosfet was 172°...
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Re: Need help with Low voltage protection circuit
SO...
I got sidetracked by a project that I have been waiting a month for (stupid Post office).
I finally hooked up the dustbuster to it, reset the shutoff voltage for 13 volts, and... My control head for my power supply couldn't handle the load. My power supply has a maximum current limit of 15 amps.
When I hook everything up to the dustbuster and turn it on my PS resets. I did some poking around and checked the resistance of the motor. it's .59 ohms. Which means that at 16 volts it pulls...
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Re: Need help with Low voltage protection circuit
I setup a test where I powered a purely resistive load of 4ohms which pulled about 7.5amps.
Using my thermal imaging camera I measured the temp of the mosfet at about 120°f 49°c. for about 5 minutes. Well withing the 175°c 347°f operating temp. I have the capability to test it to 10.5a resistive maybe 21a for a few minutes.
the whole thing was in free air with fans blowing about.
I did run in to an issue and it may require some tweaking of the hysteresis settings and resistors. If you turn...
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Re: Need help with Low voltage protection circuit
Just got my boards back from JLCPCB
IT works perfectly. though see if you can spot the error (on my part).
Yes I forgot to join a copper area to a network....Last edited by flinx; 09-01-2020, 03:02 PM.
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Re: Need help with Low voltage protection circuit
I got my 36v power supply yesterday, got it all hooked up to the control head and was able to make some more detail measurements.
It takes a bit of fiddling to dial in but I have it currently set to turn off at 18.02 volts and back on again at 20.68v. A spread of 2.66v.
The hysteresis does have an effect but it will take a bit more fiddling to figure out exactly how. When it is adjusted the cut off has to be re-adjusted. this is not a big deal and after I can test it under load I can decide...
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Re: Need help with Low voltage protection circuit
ok, it was only there because it was on the original board no other reason.
now removed
...Last edited by flinx; 08-17-2020, 07:31 PM.
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Re: Need help with Low voltage protection circuit
circuit board
with 1oz traces it can handle about 8 amps, with 2oz it can handle 13, and with a 12 gauge bare copper wire soldered to the bottom traces for b- to out- and b+ to source it should be able to handle at least 20 amps.
The mosfet would be laid down, soldered to the board and the output wire taken directly from the tab.
board is 2.6"x1.4" I'm sure it could be made much smaller with SMD but that's not my bag.
also I would most likely not be using this with anything...
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