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Hello Everyone! So as a recent graduate of Electrical Engineering, I have finally found some time to get back to my old hobbies which got me interested in the major to begin with. So, I've been trying to start a little online electronic superstore for us niche hobbyists since like 2008... and...

No, that's the Max/Min from previous measurements, it holds the value. I never reset it. It's a straight line, the next picture is that same signal zoomed all the way in (about 40mV ripple). Both of the measurements were taken at 4.7V, that's the experimental 780mA version. It doesn't run well...

Here are the scopes from the output. On the VERSION 1: BOOST board, there was very minuscule (basically nonexistent) ripple On the SEPIC version, there was slightly larger ripple on the switches, but it didn't kill the diode. Still, seemed a bit excessive. See below. I am about 80% certain...

I'll post the DC line scopes on monday. The "residual output ripple" is as calculated, in the post on the top of the previous page. That being said, I'm sad to see that you find no value in the oscilloscope readings from the main switching diode. Those are not readings from some "intermediate...

Definitely a valid observation. It would also help a lot if I moved the output capacitor and shottky diode closer to the actual chip. These are modifications I'm working into the next batch. Best, amk

There is no ripple on the output, that is the point of the output capacitor. Otherwise it would not be a regulated constant current source. The pictures (which you can click on to enlarge) provide you with the details on the only part of the circuit that an O-Scope is meaningful to use as a...

Will post as I did above. All scope readings are from the switching diode in the circuit, the current and voltage on the output don't change wildly enough to make meaningful measurements, but those values have been calculated in case you are curious. Actually, if you look at the Web page the...

I will update the above post sometime in the immediate future with the test results from the Mark 1 Boost style driver. Bottom line is, they both work well, one is considerably cheaper than the other to make. Both designs need a couple of touches here and there to work best and can be shrunk...

What diodes are y'all using right now? When I left the popular reds were LD-215's and blues were 8x/6x burners. What kind of current ranges do the diodes currently use need? I'll look into multi-amp driving as well, I'll let you know. Best, amk

Ok, so here are my results after some testing: VERSION 1.0 - Boost Converter I've tested this version of the driver at various voltages; two current configurations are posted above. Load: Same as below So the device operates with a minimum of 2V input, and dies at a Maximum of 7V. In...

Actually, not a problem. Any examples/dimensions of current boards with this feature would help. Mainly for determining the optimal position of the switch. The original idea was to make them fit in the aixis modules, the next batch will probably have to run a bit smaller More operating...

Working with a few, namely LM34xx series chips. Boards are in! Preliminary testing of my designs showed promising results, but lots of noise. Ready to test the actual small package layout, except I ran out of IC's.. haha. Ordering more as we speak. Here's some goodies: Gold...

UPDATE: So I received all of the parts a couple of days ago, and I've begun testing some simple boost circuitry. Does anyone use bench supplies or wall adapters for their laser projects? I can quickly fab out some simple bench-sized filtering driver circuits for running laser diodes off of a...

Actually, the same amount of energy is "incurred" regardless of the incident beam size. The only difference is the area over which that energy is distributed. Thus, if you distribute the same amount of heat over a pin-sized focus point, that individual point on whatever material you're shining...

To be fair, he did say not cheap :) The CFB design on that page is pretty awesome too. I don't like how they did the transistor design though. Using MOSFETs would eliminate the need for the resistors on the emitters, as there would no longer be any thermal runaway.

True, I just have a million assorted op-amp chips lying around everywhere, so to me having to mail order a new part makes it "harder to come by", haha. Also I know texas instruments blocks access to its chips/datasheets in some countries, but I guess that would be a very rare problem. Very...

Nice! I'm curious to try it now. Thanks for the updates

Hey everyone, I see a lot of posts (most are actually pretty old, come to think of it) on here with people building LPMs and interface kits with IC's or discrete parts that require Split (or Dual) supplies. In order to achieve this, most people tend to get two 9V batteries (or something of the...

I remember two years ago, this guy "Steve0011" (now banned) messaged me in regards to a new "startup out of Silicon Valley that lets people easily run their own group buys". At the time, I believe massdrop had just started, and Steve/his colleagues were doing a group buy on a car forum. Link...

It looks like that just simulates a certain voltage drop. My test loads would actually simulate laser diode operation. It would basically be the transistor equivalent circuit of a laser diode, with a pot to set the desired "threshold current". If it is really desired, I could probably also make...