I've come across this fault in the past. A battery operated device with seemingly good circuitry is draining its batteries flat very quickly compared to other identical units.
In this video I track down and repair the problem.
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In this video I track down and repair the problem.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
I've got two battery powered PIR's that are drawing way too much current and flattening the 3 x AAA batteries. Yet they both work OK. So by your measure I should look for a leaky C first eh? There's also a SMT electrolytic that has been replaced with a wired electrolytic (in both) ….!! I suppose it makes sense since it works, but what do you think of that: They do usually leak a bit of DC. I've dealt with surface mount BUT not really the fault finding/failure side of them. I'm aware of static damage especially to Transistor junctions. So I'll go for the caps first then. I enjoyed your videos. Unpretentious, very honest, and full of handy snippets. Thank you.
Notes: Me a lifetime of "electronics" from valves on. A bit lazy now wrt surface mount as the eyesight isn't that good. These really are tiny. I just want a result! Rgds BjG
Whaaaaa…..why?…..why on earth are you shopping on BD? Second thought….I don't wanna know.
Clive I'm curious about what printer you use, the image quality looks really good.
One "solution" to MLCC is to have two in series so if one shorts you still have one left before it shorts out.
And also seen on EEV Blog it can be soldered to a seperate small pcb for holding the MLCC and the soldered to the board to prevent stress on it so it's decoupled from the main board
I upgrade these types of lights with 18650s and a TP4056, maybe a buck converter if it isnt bright enough.
Works very well
sound like the reason for those samsung batteries burning??, and those electric skate boards ?
Neat stuff.
I always buy a tempered glass screen protector on my phones. 🙂
epic plug plug 10/10
Clive needs his own BISS0001 clone… PISS6969, anyone?
Leak test would of been nice to see
Capacitors have always been the weak points of electrical circuits. It's a shame that the modern world has not solved this problem.
put masking tape (or painters tape) on top of shiny things when using thermal camera.
Nice!
Thanks Clive this inspired me to look at an Aldi strip led PIR powered by 4 AA cells it only lasted a few days. It look as though they put a 3.3 V Zener to stabilise the voltage for the PIR this was fed b a 1K resistor it was drawing a constant 2.7m-A when the cells were new. Removing the zenner cut the consumption and it still works ok. I think the circuit was designed for power supply operation rather than batteries. Could this be the case?
Always blame the capacitors before all else, that was the first lesson I learnt when I comes to troubleshooting power problems… Well that and how useful Bad Dragon "tools" are to technicians, because we work hard and play harder.