I added a toggle switch to my power conditioner. Never a question about any drain issues. Easy.
Joe N1KHB?
On Thu, Jul 25, 2024 at 2:05 PM, Steve W2SGM
<steve@...> wrote:
Mike, that power conditioner looks great. Without knowing how you have designed the circuits in the device, I am wondering if you have also (intentionally or otherwise) solved the excessive power-off battery drain that happens in the FT-817/818 when there is something plugged into the barrel connector. I felt I should share the attached schematic that details one potential fix.
The often-seen phenomenon of the overnight dead-battery is caused by a CPU-controlled sense on the DC jack that changes the radio's behavior. Anything connected to the jack, even an unpowered lead, will cause excessive power draw when the radio is off. The current drain is from the CPU; it's not a passive current draw.
You can tell a fix is needed with your powerpole adapter if the backlight (when set to Auto in settings) stays on all the time when there is a connector in the jack. This means the power-off draw is ~4 mA instead of the usual .5-1 mA. If your powerpole adapter is connected and the auto-backlight times out as it should, no further fix is needed.
On 25 Jul 2024, at 8:42, Mike Bryce wrote:
Hey, gang...
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Things have been slow in the shack, so I've raised from the dead a project I started back in 2018. This is a power conditioner for the 718/818.
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Unlike Phil's design, I can't remember his call, this is an external box.
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The photos show a early proof build unit.?
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There are Anderson power poles for input supply.
A field replaceable fuse
Reverse polarity protection
All kinds of noise and spike suppression
Can do 3A output all day long without adding heat to the 718's chassis
the whole shebang mounts into a cast aluminum Hammond box.
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A new design is being worked on, and if there is enough interest, I might move forward with this project.
Might have a need for a few beta testers soon.
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I'm Mike, WB8VGE
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