[R-390] ER article for R390A SS regulator

[djed1 at aol.com]

Perry- I originally referenced the article but have no interest in the SS regulator (I'm a resistor guy).  But, you misread the article- the 3TF7 has spikes on a step change in the line voltage, but the SS voltage is flat at all times (ER # 320).  As you might expect, the thermal characteristics of the 3TF7 don't allow a quick response, while the SS version does. In the real world I doubt you'd see a step change in voltage.
I would agree that you could homebrew a regulator for less money, but some people have more money than time.

Ed  W2EMN

 

 

 

-----Original Message-----
From: Perry Sandeen via R-390 <r-390 at mailman.qth.net>
To: r-390 <r-390 at mailman.qth.net>
Sent: Sat, Apr 9, 2016 11:04 pm
Subject: [R-390] ER article for R390A SS regulator

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 detailsI'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   ______________________________________________________________R-390 mailing listHome: http://mailman.qth.net/mailman/listinfo/r-390Help: http://mailman.qth.net/mmfaq.htmPost: mailto:R-390 at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html