Re: schottky diode now another question!

Hans Summers


I quoted Peter DL6DSA's comment directly. I have no idea but I assumed "grinder" is a direct translation from German. I found it more convenient to not try to alter any text, just quote it as given. We all know what he means!

73 Hans G0UPL

On Fri, Dec 1, 2017 at 4:09 PM, DK <donaldphilbin@...> wrote:

Thank you for your prompt and very informative reply! 

I have another question, this time Peters DL6DSA’s LCD Contrast improvement modification. Peter writes:

"I have found a simple solution for improving the adjustability of the R47 contrast potentiometer in the QCX: By adding additional resistance between the grinder of the R47 and GND, 

The grinder? I don’t think we use this term ( as applied to a potentiometer; a sandwich but not a potentiometer )! 

Is the grinder the “wiper” often the center pin of the potentiometer? I really enjoy learning the differing terms we use for a common hobby. 

I have the 30  M kit which I will build as soon as I return stateside.



On Dec 1, 2017, at 19:52, Hans Summers <hans.summers@...> wrote:

Hi Al

That is true, about the main reverse polarity protection diode. However he's not asking about that one, he's asking about the diode in this modification:

73 Hans G0UPL

On Fri, Dec 1, 2017 at 3:48 PM, Al Holt <grovekid2@...> wrote:
It's the lower voltage drop. If a 'regular' silicon diode is used the drop across it is about .6V. The drop across the Schottky is more like .4V. This puts a slightly higher voltage on the PA FETs and a little more power out.

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