[R-390] ER article for R390A SS regulator

[R. David Eagle]

I agree....it seems like a pretty simple design and I will admit that I am not a purist when it comes to making my 390a work.  I have one of the eBay modules on the way so I am hoping it works good!
DaveKB8NNU 
 
 
  On Sat, Apr 9, 2016 at 11:01 PM, Perry Sandeen via R-390<r-390 at mailman.qth.net> wrote:   Hi,
I read the article with a keen hope that this was the "Real Deal".  I had seen it advertised on epay and it looked very nice.
When I read the article and saw the graphs I was highly disappointed.
First one graph showed upon turn on an almost instantaneous jump to full voltage.
Another graph showed its voltage response to the change of input voltage to the receiver.  There seems to be a lag period after the input voltage changes before a settling to a value.

I have no idea whats inside that makes it work that way.

With a small bridge rectifier, a LM317 regulator, a 4.2 Ohm resistor would give one almost exactly 300 mA when set up as a constant current regulator. (Perhaps a couple of filter caps should be added) Total cost, less than seven dollars.
 One would have to make a 7 pin header but that could be done with two seven pin tube sockets mounted face-to-face and some #20 solid wire. See the Y2KR3 anthology for details

I'm all for the free enterprise system but this product doesn't seem to work very well. That said there is another SS regulator on epay for about the same amount of money that might perform much better,
Regards,
Perrier


   
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