Search results

Hmm... I guess the optimal method for measuring currents would be some sort of current probe for the o-scope. Some look like a current clamp like those they use for measuring kiloamps on thick wires, but in miniature. I know they exist but i think i haven't seen any IRL. What I do for current...

I can see 100mVpp 100Khz ripple there. According to TPS63000 datasheet's captures, the frequency of the ripple is about the same they get, so that might come from the regulator itself, and not from the INA193 part. So yeah, pretty good specs! Maybe a bit of extra capacitance in the output would...

Pretty cool! Yeah, looks good once soldered, very good job there! I thought you knew you were going to need really small value resistors! That's why I told you that the idea of using a potentiometer in paralel with the sense resistor woudn't work at all, as there are no pots with such low...

If you can wait like a week or so until the coils arrive (I can wait for the sleds too) , how about a TPS63020 based laser diode driver, which should be capable of 2A buck-boost, adjustable and all that stuff? It'd be a "prototype" and I don't actually know if it will work, but if it does (which...

I don't have problems or trouble finding them, I just want them cheaper than in stores if there's someone willing to sell me one at lower price. If I can't find anything cheaper, I can get them for 38€. I just ask here because some time ago a member offered me one of this sleds for $10 IIRC, but...

THIS MAN SPEAKS TRUTH! And that's even more true while wearing goggles. Knowing you are protected you tend to be a bit less careful and risk a bit more. But that kind of confidence can only be given by certified protection.

More expensive for me than buying them in psxboy. The idea here is to get one a bit cheaper than I could get in stores, or find someone who would trade a sled for a diode driver or something like that.

Anyone has spare, working KES-400AAA sleds from the PS3 era wanting to sell them? I need one for my second PS3, whose reader has said goodbye.... I'd need it to be shipped to spain.

I buy positive coated copper board, which comes with the photoresist already laminated and it's quite cheap. Instead of using toner transparencies I use inkjet transparencies, I print them at photo quality and right after the printing is finished I coat them with talcum powder, remove the...

Yep, that PCB is much better. I'd still change the place of a couple of resistors to increase the heatsinking area and add some vias to a larger plane in the other side, and I'd also shorten the V- trace of the INA193 (when you make millivolt scale analog measures in a quite noisy environment...

Heatsinking an IC from the plastic back is not very efficient... Most swithcing IC's are packed in thermally enhaced leadless packages which get rid of most of its heat via a thermal pad in the back of the IC. You are supposed to make a lot of vias under that pad that connect it to a...

Class D works by PWM modulating the audio signal at 4 to 10 times its max frequency (i.e 80-200Khz or even more, I've used some which modulated at 600Khz). Then the modulated signal goes through a power stage (most times push-pull power mosfet configurations). Some D amplifiers require output...

Good to know i'm not the only one who miserably failed with that configuration... and also good to know that TI's regulators can be driven that way. It was hilarious when I assembled my first driver with current sense amplifier. I knew it would fail because the simulator said so, but I wanted...

Okay, the traces are too thin. You should use 15-16 mil for signals and around 25-30 mil for power and feedback sense. And the grounding is still wrong and that's a big issue you MUST correct. Grounding like that would work for lower frequency devices but this one switches at 1.5Mhz. Definitely...

1st: PCB is WRONG. You're dealing with high currents switching at high frequency. YOU MUST ground to a point or solid ground "plane". Using small traces between leads of components and then to the ground point is a fail, as the traces between component's pads act as parasitic inductances... and...

Linear technology is a VERY well known company that produces very well known integrated circuits that perform really good. I have quite some experience designing switching drivers and most of them have used integrated circuits from Linear. Why would I discard LT3477? Well it's a pretty good...

Keep reading the datasheet! It's not fixed current, you can adjust it via a potentiometer. That potentiometer adjusts the voltage in the CTRL/SHDN pin, and there is a voltage range where you can adjust the output current. And no, it isn't able to power a blu-ray, but blu-ray diodes we mess with...

No no and no, LT1930 works exactly like LM3410X, but it's less efficient. LM3410X is just better as it's designed for driving LED's and has a very low reference voltage requiring a much lower value current sense resistor, so less power is wasted there. LT1930 is intended as VOLTAGE regulator...

Ic is LT1930, coil is LPS3008 (or 3010, dunno exactly) 4.7uH from coilcraft, schottky is a MBR0530. That's not the best PCB i've done (by far) because the soldermask's mask (the photolite used to insolate the soldermask paste to make it harden) moved, I didn't notice it and it turned out...

Yeah and I built it! I also have one laser like that! But mine has green host and quite a few hours on it already...