Recent content by erdabyz

Hello, I need a favor from someone in the forum that lives in the UK and wants to buy ebay stuff for me. I'll probably need this item very (very) soon: Sony Viao Pcg-4d1m Complete Screen And Surround + cable en venta en eBay.es (finaliza el 15-abr-11 19:53:28 H.Esp) But the guy doesn't ship to...

Great it worked! But don't forget to make some startup transient analysis! You don't want to stress your diodes with startup current spikes!. The capacitor filters the Vfb, but at the expense of a likely startup current spike because the capacitor needs to be charged to Vfb and that takes time.

I use a homemade charger using an integrated circuit from TI. It implements proper charging algorithms (CC/CV), detects failure conditions and much more, and cuts off at a user programable current and it charges at up to 1.1A. It's a single 4x3x1mm IC, a USB connector and some passives. For...

Well, after months waiting my host to come from dealextreme, IMMA NOW FIRING MAH 445nm LAZOR! I'm using this host: DealExtreme: $12.50 SacredFire NF-014 Cree Q2-WC 120-Lumen LED Flashlight (1*18650/2*CR123A) Which I personally love. I designed a custom heatsink module for that host, and found a...

That's impossible, a series capacitor blocks the direct current, only letting alternate current to pass through. It's very hard to tell how lava does it without having an actual lavadrive in our hands. But the capacitor isn't in series with the FB input, that's for sure. To jib: I told you I...

Oh, forgot, it's likely a short-circuit under the coil. Those XFL4020's come with a ton of solder in their pads and if you put too much paste, it forms a ball under the coil and shorts it. The solder they have is also pretty fluid for some reason, and the coil can't stop moving under the hot air...

It's been a long time, I know, but huh... I'm fried with work and more work... Yesterday I managed to test your TPS63000 drivers. Charging it with a 3V load and giving 4.1volts to it, it had a 100mV voltage ripple... but almost 200mA current ripple. With a 5V load, the results were .5Amps of...

Tying the low side and tap together would be OK too. What you want is a voltage divider with a fixed value low resistor to limit the max current. The value of that resistors depends on the value of the sense resistor. For example, let's say you want to make an adjustable driver from 400mA to...

Hmm the pot's value should be calculated considering both INA193 output impedance and TPS63000's feedback input impedance. What experience and logic tells me is that TPS63000's FB input would be the gate of a MOS transistor, so that impedance should be in the tens of Mohms range, and that...

Okay dudes, my driver doesn't work anymore. I've screwed it... but I think it's not beyond repair. It was getting a bit hotter than it should, I hadn't noticed it because it dissipates heat so fast that it went from untouchable to warm in a matter of seconds, so when I touched it after testing...

SUCCESS! 1.278Amps! FUCK YEAH! (gonna study, i'll post pics & stuff tonight)

Sure I will, if it works. This is how the PCB looks: That's totally homemade, still needs drilling. I'm gonna drill it and stuff it later. Hope everything works fine and I can get it working before I have to start studying... It's made bigger than needed on pourpose, to have more heatsinking...

Well I myself have succesfully reflown some 1x1mm 4 pin BGA differential amplifiers. I spreaded a little bit of soldering paste so it would melt and act as a thermal bridge between pads and balls, and it went fine. Dunno how that method would work for higher pin count BGA's... My reflow station...

I was thinking about coating a polyethylene sheet with UV curable soldermask (the same I use for soldermasking PCB's), insolating and then etching the uncovered plastic with acetone or using heat. I have to find some poliethilene sheet thick enough to be used as stencil and try it. Never heard...

How much for 5 peltiers shipped to spain? I can't see how much peltiers are in the post.