I know that he built it for 9v, same as mine. ?I know that one can choose to build it for 12v input by a small change in the winding of a toroid.?
I do not know why the components after said toroid get excited if less than 12v is used if built for 9v….. I am basically a math guy.
John
?Each mistake is a learning opportunity.?
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On Mar 30, 2025, at 8:39 PM, Kaufman, Matt - N3AR via groups.io <matt.d.kaufman@...> wrote:
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The device can be built to either handle 12v or handle 9v; the person asking the question here built their radio (the transformer part, specifically) for 9v.
On Mar 30, 2025, at 5:35?PM, KK4ITX John via groups.io <jleahy00@...> wrote:
There doesn’t seem to be a clear consistent answer, the manual implies “a little over” is OK but does not define “little”. I admit that I don’t understand how a device that can handle 12v can’t go over 9v.
I do know that I have made contacts quite well with just 2 Lion 18750’s and they last for the duration of the park operation. ?The output is <4w, not a big deal.
Until we really know, just play it safe, many ways to keep the voltage under 9v.
John
KK4ITX ?
?Each mistake is a learning opportunity.?
On Mar 30, 2025, at 7:59 PM, Daniel Conklin via groups.io <danconklin2@...> wrote:
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You could put a small buck converter or a couple of diodes in the line to drop the voltage into acceptable range.
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73, Dan - W2DLC
KK4ITX John