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Search: Posts Made By: stj
Forum: General Electronics Technical Discussion Today, 04:27 AM
Replies: 3
Views: 51
Posted By stj
Re: Question about current balancing in LED strings

i dont understand that circuit.
and the exact wiring makes it dependent on the left string not losing any leds!
Forum: Troubleshooting Audio Equipment Today, 04:23 AM
Replies: 6
Views: 87
Posted By stj
Forum: Troubleshooting Appliances and other Household Electronic Stuff Yesterday, 06:31 PM
Replies: 20
Views: 187
Posted By stj
Re: Sencor SVC7020BK robot vacuum cleaner problem

q21 may be partially shorted,
the base shouldnt draw enough current to heat a resistor
Forum: Troubleshooting Appliances and other Household Electronic Stuff Yesterday, 02:33 PM
Replies: 20
Views: 187
Posted By stj
Re: Sencor SVC7020BK robot vacuum cleaner problem

that makes no sense, how can the battery voltage rise under load?
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 01:09 PM
Replies: 7
Views: 152
Posted By stj
Re: Swollen power bank

apple used to say that you can charge a lipo about 500 times
Forum: Troubleshooting Audio Equipment Yesterday, 01:08 PM
Replies: 6
Views: 87
Posted By stj
Re: Harman Kardon AVR 171S - standby led lights up, does not turn on

how did you fix the cooling, did you replace a 3wire fan?
Forum: Troubleshooting Appliances and other Household Electronic Stuff Yesterday, 01:06 PM
Replies: 20
Views: 187
Posted By stj
Re: Sencor SVC7020BK robot vacuum cleaner problem

get back to that lm393 - maybe check it's output signal under load
Forum: Troubleshooting Appliances and other Household Electronic Stuff Yesterday, 10:41 AM
Replies: 20
Views: 187
Posted By stj
Re: Sencor SVC7020BK robot vacuum cleaner problem

ceramics either work or go shorted - and then they would burn.
Forum: Equipment Usage, Soldering, Techniques, and Reviews Yesterday, 10:39 AM
Replies: 8
Views: 124
Posted By stj
Re: 858D hot air station provide air at 200 degree instead of 500

the heater is mains voltage 230v, the heat is controlled by the board pulsing the power and an ajustable speed.
Forum: Troubleshooting Appliances and other Household Electronic Stuff Yesterday, 08:30 AM
Replies: 20
Views: 187
Posted By stj
Re: Sencor SVC7020BK robot vacuum cleaner problem

if you turn the motors by hand, is there any friction or are they spinning o.k.?
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 08:24 AM
Replies: 7
Views: 152
Posted By stj
Re: Swollen power bank

i think it's hydrogen.

it looks like a stack of cells - are they all like that?
Forum: Equipment Usage, Soldering, Techniques, and Reviews Yesterday, 08:23 AM
Replies: 8
Views: 124
Posted By stj
Re: 858D hot air station provide air at 200 degree instead of 500

on the board under c3 is a transistor or something - has it got a hole in it or is it the camera?
Forum: Equipment Usage, Soldering, Techniques, and Reviews Yesterday, 08:19 AM
Replies: 8
Views: 124
Posted By stj
Re: 858D hot air station provide air at 200 degree instead of 500

when you turn it on, do you see the temperature rise on the display?
if yes then it could be the feedback circuit.
(we can check that with a soldering iron)

also, look at the aviation connector...
Forum: General Electronics Technical Discussion 09-23-2022, 04:34 PM
Replies: 21
Views: 316
Posted By stj
Re: How to build this little device please for my campervan security

we used to put small explosives in jam jars - that has a good effect!!!!!!
Forum: Troubleshooting Appliances and other Household Electronic Stuff 09-23-2022, 04:32 PM
Replies: 20
Views: 187
Posted By stj
Re: Sencor SVC7020BK robot vacuum cleaner problem

lift one end of each resistor before testing, your metering the internals of the lm393 at the moment! :D
Forum: Troubleshooting Appliances and other Household Electronic Stuff 09-23-2022, 02:30 PM
Replies: 20
Views: 187
Posted By stj
Re: Sencor SVC7020BK robot vacuum cleaner problem

change the LM393, it's the only thing that could show a low battery if r6,7,8 & 9 are o.k.

d16 if you look, has a bypass - r8,9,10,5 and j28
all in series allows the diode to be bypassed via...
Forum: Troubleshooting Appliances and other Household Electronic Stuff 09-23-2022, 12:34 PM
Replies: 20
Views: 187
Posted By stj
Re: Sencor SVC7020BK robot vacuum cleaner problem

you should find a manual to see what the leds mean.

looking at the schematic, 2 things i noticed.
1: the "charge circuit" is bullshit, charging a 14v battery from 19v with a 6ohm resistor is sooo...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-23-2022, 12:24 PM
Replies: 8
Views: 124
Posted By stj
Re: 858D hot air station provide air at 200 degree instead of 500

post a picture of the board, i have some schematics
Forum: General Computer & Tech Discussion 09-23-2022, 11:34 AM
Replies: 5
Views: 118
Posted By stj
Re: What’s the bottleneck with x58?

pretty sure it's mostly gpu needed for that game
maybe it's an o.s. problem.
game was written for what - vista age machines? win7??
Forum: General Electronics Technical Discussion 09-23-2022, 09:25 AM
Replies: 21
Views: 316
Posted By stj
Re: How to build this little device please for my campervan security

yes, but i was thinking of using the cartridge/powder to make a flash-bomb or a small electrically fired mortar full of plastic beads or chilli powder etc.
Forum: General Electronics Technical Discussion 09-23-2022, 09:23 AM
Replies: 3
Views: 59
Posted By stj
Forum: General Electronics Technical Discussion 09-23-2022, 09:19 AM
Replies: 52
Views: 439
Posted By stj
Re: 12v 1uo941243c Relay repairable?

it's possible that it's just what we see.
it reminds me of the circuit used with trailer sockets.

@bohaboha - do you have a tow ball and socket for a trailer on the car?
Forum: General Electronics Technical Discussion 09-23-2022, 05:45 AM
Replies: 52
Views: 439
Posted By stj
Re: 12v 1uo941243c Relay repairable?

well - bohaboha will know what it does - because that function wont work now it's been removed :D
Forum: General Electronics Technical Discussion 09-23-2022, 05:26 AM
Replies: 52
Views: 439
Posted By stj
Re: 12v 1uo941243c Relay repairable?

before it failed, did all your doors lock and unlock reliably?
including the fuel filler cover?
Forum: General Electronics Technical Discussion 09-23-2022, 03:13 AM
Replies: 52
Views: 439
Posted By stj
Re: 12v 1uo941243c Relay repairable?

door lock motors sieze or jam,
i'v replaced a number on ford and bmw - total shit
it's a tiny brushed electric motor with a BRASS gear on it driving a PLASTIC rack that extends or retracts.

i...
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