Recent content by Achro

I got my 445's - Pressed 'em, Powered 'em...impressive. DTR sure delivered the goods, and fast shipping too. -Achro

Re: DIY XY scanner from PHR-803t lens positioner c In answer to a PM I received on hooking up to the actuators: I cut the flexible circuit off and soldered two small enameled wires on. I will post a pic in the thread. There are six leads going to the three sets of coils. One coil moves the...

Re: DIY XY scanner from PHR-803t lens positioner c I was driving mine with an amplifier with a < 2 ohm output impedance. I suspect this helped the damping. In this manner, Any back emf generated in the coil would opposed strongly by the amplifier output. It is pretty easy to add a pnp/npn...

Re: DIY XY scanner from PHR-803t lens positioner c I will probably do something with opamps and add an agc/limiter and such to keep it from banging into the stops. Thanks for the mirror link. Jim

Re: DIY XY scanner from PHR-803t lens positioner c Here's a pic of the beam with some audio driving XY on my wall...

Re: DIY XY scanner from PHR-803t lens positioner c I got 10 posts now, trying again...

If your plotter xy stage is capable of moving a fold mirror and a lens around, CO2 is a good choice for cutting stuff. 10.6 micron radiation is totally absorbed by most stuff including paper. The DVD lasers are way too wimpy to cut anything fast. Paper absorbs 405nm bluray much better than the...

Re: CHEAP PHR-803/lpc SLEDS IN STOCK I ordered 4 lpc sleds

I was messing around with some lens positioners from some PHR-803 sleds tonight. They have three degrees of freedom, in and out for focus, side to side, and tilt side to side for tracking. The coils are around 4 ohms, and the tilt axis drives pretty good with a couple tenths of a watt of audio...

Re: 405nm AR glass lenses - fit AixiZ  FEELER You can put me on the list for at least 2 lenses optimized for 405nm

Generally you must keep the maximum die temperature substantially under 150C. I seem to recall that the theta-JC (thermal resistance Junction to Case) is around 60 to 80 K/W for the 5.6mm packages, and given a diode operating point of say, 130ma with a forward drop drop around 4.8V for a bluray...

You could use almost any constant current driver, such as the LM317 circuit or the Rckstr circuit to set the maximum diode current. Then, just connect a shunt transistor such as an npn or an nfet to steer some of the diode current to ground in order to control the current/light output. You could...

I stumbled across some interesting Mitsubishi data sheets at the Glyn website Specifically, the ML101U29 660nm open can red 150mw(cw) / 400mw(pulsed) Mitsubishi also produces a 140mw(cw) / 250mw(pulsed) 405nm, the ML320G2. The forum won't let me post links yet, but you can google the part...

Re: SALE PHR-803T $13 & LPC-815 $13.50 INSTOCK My PHR and LPC sleds arrived today. Shipping took a bit longer due to holidays, and the tracking was not very useful, but I wouldn't fault Tommy for any of that. He shipped the promptly. -Achro

Been lurking the last month or so... I am new to this forum, but not new to lasers, electronics, etc. ;) -Achro