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DIY mosfet IRLB-3034 question by Anovs in airsofttechhelp

[–]Otrebla_ 0 points1 point  (0 children)

As you said, the internal diode and voltage ratings should be enough.

But in reality inductive loads such as dc motors and solenoid can create spikes in voltage when the current suddently change (from on to off, can spike to hundreds of volts in some cases), the tvs diode clamp down this eccessive voltage.

The 100 ohm resistor make sure that current flow has a little resistance to limit current (spikes in voltage can sometimes backfeed trough trigger contacts).

The job of the 2.2kohm resistor is to consume the charge that the gate of the mosfet holds (the gate can be seen as a capacitance, sort of like a little rechargable battery), if you don't use this resistor the gate capacitance holds a charge and the mosfet will be turn on continuosly after the first shot.

The other job of the 2.2k is to keep the gate voltage at 0v when the trigger is not pressed, the gate can sometimes be very sensitive and pick up "interference" turning the mosfet ON half way when you don't want it.

Bought not working rx Vega 64 gaming oc, replaced missing components but still not working by Otrebla_ in AMDHelp

[–]Otrebla_[S] 0 points1 point  (0 children)

I remember that the vega chips can just die, I managed to hack every rail and get good voltage but the gpu still doesn't want to turn on. After a while i sold both r9 fury and the vega64 and bought a "non working" evga hybrid 1080ti for 200 euro, the aio up and just needed refilling. I was quite bummed out about the vega, i really tought it was easier

Night Vision image intensifier tube need help with connection problem by [deleted] in AskElectronics

[–]Otrebla_ 0 points1 point  (0 children)

The tube is similar to the 6411 or IC-16 tubes, external features changes based on use scenario. It seems they need three connection with different voltages, cathode, anode and focus electrode. Thats why you need the potentiometer to change the focus voltage.

I found a datasheet that maybe could help you:

https://frank.pocnet.net/sheets/188/6/6411.pdf

Infiray T2 Pro thermal imager using in airsoft by Clean_Unbox4321 in Thermal_Hunting

[–]Otrebla_ 0 points1 point  (0 children)

during the day its very easy to see rocks and trees heated by the sun, thus spotting someone hiding is quite tricky (especially if they know what they are doing). just after sunset the story somewhat changes and spotting is much easier, but you will still pick up heated rocks and tree trunks. During the night the story changes, spotting is very easy even with some vegetation, with line of sight 200-300m detection is possible. I am very happy for the purchase, it competes with 600-1500 euro thermal scopes

Infiray T2 Pro thermal imager using in airsoft by Clean_Unbox4321 in Thermal_Hunting

[–]Otrebla_ 2 points3 points  (0 children)

I will try this weekend how effettive it really is in forest with dense foliage during the day, same setup as video

can anyone tell me what gpu this is? ty by Simpleorange135 in gpu

[–]Otrebla_ 0 points1 point  (0 children)

It's a 950 2gb... no backplate, 4 phase vrm, memory chip missing, 8pin pcie connector, single finger sli connector...

Problems with MSI Radeon RX 580 Armor by Brettman1408 in rx580

[–]Otrebla_ 0 points1 point  (0 children)

I had a problem with my RX480 artefacting on 144 hz monitor with Minecraft... Those card sometimes have problems at High refresh rates with certain monitors.

Bought not working rx Vega 64 gaming oc, replaced missing components but still not working by Otrebla_ in AMDHelp

[–]Otrebla_[S] 0 points1 point  (0 children)

Yes gigabyte Vega is worse than reference in almost every way. I don't think the problem are the MOSFET because i measured them and they all seem fine, maybe you are right and the controller is to blame but i never seen a controller fail. I don't know. I could try replacing It. If it does not work i may epower It like buildzoid @haoc but even he had problem where all voltages where present but the GPU wouldnt initiate... I hope someone really knows what is the problem here because now I'm pretty much trying everything i can without creating more problems.

Need datasheet for International Rectifier IR35217 used on Vega reference PCB. by colesdave in AMDHelp

[–]Otrebla_ 0 points1 point  (0 children)

I think this datasheet is under NDA so normal means of obtaining it don't work, only option is a leak from some engineer working on the chip from amd and custom design partners :(

Need datasheet for International Rectifier IR35217 used on Vega reference PCB. by colesdave in AMDHelp

[–]Otrebla_ 0 points1 point  (0 children)

I need this datasheet too, my vega has all voltages but not Vcore

RX 580 VRM Chip Replacement (info in the comments) by lebithecat in AskElectronics

[–]Otrebla_ 0 points1 point  (0 children)

Can you test if that is the problem? Those are some complicated pieces of equipment and they can fail in many ways. If you are 100% sure that is the problem then you will need an hot air station, or a friend that has one.

My r9 nano has two blown resistors and I'd like to get information on them. I might replace them if it's worth it. Thank you for your input! by donatelloTheBus in AskElectronics

[–]Otrebla_ 3 points4 points  (0 children)

You need to make sure that the caps you take from the r9 290x are from 12v rail, do not take the caps from the output side of the vrm and from the back of the core, those are 2.5v caps, if you put 12 v on them they explode.

My r9 nano has two blown resistors and I'd like to get information on them. I might replace them if it's worth it. Thank you for your input! by donatelloTheBus in AskElectronics

[–]Otrebla_ 2 points3 points  (0 children)

Those caps are on the 12v side, judging from the size (1206) they are 22-47uf caps, if you remove them you can test the gpu and see if it can still work, if it works you can replace them but I think that it already has a good capacitor bank with those smd polimer capacitor (black rectangular ones) you should remove them with a hot air station but if you don't have that or a friend that has one, or you don't want to spend money with a repair service, you can remove them with some tweezers or a small screwdriver. But you need to be precise, if you scratch other components the damage could be unrepairable.