[ARC5] Considering GO-9 Transmitter Power Options.

[David Stinson]

MOSFET Regulator:
I should have clarified about that circuit:  The "tap" in the zener 
stack is selected for the final regulated voltage out you want.  i.e. if 
you wanted 250V, you'd tap the stack at a "250V" point.  The Zener stack 
is selected so that, at full load, the unregulated input voltage will 
still keep the zener stack forward-biased.  If they ever stop 
conducting, you're unregulated down to the "voltage floor" of your 
supply.  I never calculate anything on this- just load the power supply 
to the max current expected, read the voltage at that current and make 
the stack stay in conduction at that voltage.  You can select any 
voltage below that one.  The FET I used to regulate the AT-5 MO doesn't 
even need a heat sink, though I've built a couple that did need a small 
one.
Many of the people "smarter than me" here- and there are lots- 
understand how this thing works better than I do.
73 Dave AB5S

On 9/3/2019 6:07 PM, Richard Knoppow wrote:
> This is a great idea. For instance, I found my BCC-779 Super-Pro 
> oscillator pulled with the AVC. The AVC or manual RF gain affects the 
> B+. Adding a VR tube fixed the pulling but generates some heat. This 
> looks like a much better solution.
>

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus