Re: Variable power control
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Ok, I'll probably look silly asking this, but you all know I'm a software guy, not EE, so here goes. Why can I have a 24V supply and use this:
ebay # 152837387238
to drop the voltage to 5V? It seems that less power goes up in heat using one of these, so why won't these work?
From: M Garza <mgarza896@...>
Sent: Tuesday, January 2, 2018 4:32 PM
Subject: Re: [BITX20] Variable power control
Kind of crude, but you could power the entire radio with 24v. Use a 12v regulator for the receiver and a LM350 for a variable regulator to the PA. You could set it up to be variable for only a few volts change to vary the output. You alternately could use a 12 v source and the LM350 to vary the voltage to the PA. Again, you could design something that would vary by a few watts.
Running from 24v lets you get the higher output but allows you to turn things down, as needed.
Here are a couple of LM317/350/358 calculator pages:
Hope this helps.
Marco - KG5PRT
On Tue, Jan 2, 2018 at 3:20 PM, N8DAH <Dherron@...> wrote:
On Tue, Jan 2, 2018 at 01:17 pm, N8DAH wrote: