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It Works!!! Hello All, I did get a chance to breadboard this circuit. I tried it with a few different mosfets. Both the normal mosfets and the logic-level one I tried worked great on a test load with a 9v supply. But for 6v or 4.5v supplies, the logic-level mosfets are the way to go for sure. I...

Re: Simple Adjustable Laser driver (Version 2) That's the idea exactly. The problem I had with the first driver was that the current limiting was relative. Changes in supply voltage, temperature, etc. changed the output current. This revision gives us a Vref and Vsense that are (mostly)...

Simple Adjustable Laser driver V2 Hello All, Here's the next iteration. It's not quite as simple. But it incorporates current sensing to limit output rather than rely solely on the potentiometer. This is an ultra low-dropout circuit optimized for running a 405nm diode in a 6 volt host. Here's...

Re: pre-order phr803 18$-ships anywhere #5 13 left Drew, Paypal sent for one sled and one module. ($22) (I got the last one no prob...) Thanks Again, kernelpanic

Re: Simple Adjustable Laser driver <SNIP> If the output current varies with input voltage could you change the circuit to maintain a constant current over a wide voltage range by adding a second fet to the circuit with a current sense resistor in there somewhere connected to the gate of one of...

Hello All, This is my first post. Apologies if this is already out there. Attached is the driver I built for my first 300mW burner. Instead of a regulator, I've used a IRF510 mosfet to control the current. The potentiometer adjusts current. As built it puts out around 400 mA when the gate...