http://elecraft.85.s1.nabble.com/KPA500-Curiosity-Question-tp7639508p7639511.html
Thanks to those who answered my questions. Quick response on ye olde electraft group.
> On Mar 22, 2018, at 9:22 AM, Phil Hystad <
[hidden email]> wrote:
>
> Is there a published circuit diagram of the KPA500, in particular the power supply? I was curious about the design of the power supply and had a few questions. Note: these are motivated merely by my curiosity and interest. I have no real need to know.
>
> For example, the KPA500 shows a block diagram of the amplifier & power supply and one of the voltage outputs is +270 and I was wondering what part of the amp circuit needs 270 volts, or 60 volts for that matter.
>
> In idle mode, the HV display on my KPA500 reads 71 volts. Thus, not 60 and not 270 volts.
>
> Another question -- the other voltages from the supply are +5, -12, and +12. I assume these are regulated voltages. But, is the +60 and +270 regulated? If these are regulated, what kind of voltage regulator is used. I am likely ignorant and even possibly naive in this area as I have only used low-voltage regulator chips and so do not even know if HV regulator chips even exist (would they be stacked devices?).
>
> End of questions for now. Yes, a circuit diagram would answer all my questions.
>
> 73, phil, K7PEH
>
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