BB MACHINEGUN OWNERS GROUP FORUMS - If It Does Not Shoot Metal It Does Not Belong Here :: DROZD MP661K BB Machinegun Owners Group Discussion Forum :: Drozd Blackbird "Sergey's board - 2" (9-24V, 400-2000 RPM, Full auto, 4-12 ms)

Quote: DUBB at 07:19:29 Thu May 19 2011

Quote: camracer at 22:56:39 Wed May 18 2011

Here's where I'm going with this. (No LM317) Using this:
(see page 21, fig. 33)
http://www.datasheetcatalog.org/datasheet2/6/0epqaz3x2s8gtglruwh4ik4ux67y.pdf

I don't think that will be sufficient, or if it is, you are cutting in close with that regulator. 1 amp only, that means 15 watts. Consider, instead, an LM2576, the 3 amp version. The LM317 is 1.5 amps, which is enough, I think, but 1 amp might not be. Not to discourage you from the diy project, but I thought I should show you a couple that are ready made.
http://www.dimensionengineering.com/DE-SWADJ.htm
http://www.dimensionengineering.com/DE-SWADJ3.htm
These guys make the coolest regulator pakage of all, though, I think, this last one is the 3a "universal" regulator, it'll go up or down ("buck/boost"), so it can give your Drozd MORE than your batteries are. Expensive, though.
http://www.dimensionengineering.com/anyvolt3.htm

Again your resourcefulness amazes me DUBB! Great finds. Only issue with the 2A version is it's 13v output. I need to push the limits or at least 21v.

The 3A version would do but it IS expensive and Bulky.

Yeah, I was wondering about that 1 amp output for the LM2575. I think I'll try that LM2576 you suggested. I think I may want to build the circuit so I can fit it inside the body of my prototype mag. ...but I suppose I could put it in the reservoir also..... hhhmmmnnn......
Still in the "study" stage and haven't ordered parts yet.

Thanks so much DUBB! ---Cam

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