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The Power Unit
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The Power Unit -
Re: My PILAB Project - Alfa Release - Power Unit...
very nice project! my congrats to you!
i see some tiny obscurities... values must be
L4 - 170 uH
C38 - 1500 pF
R103 - 3,3 is big value. must be 0,22 oHm. the big value adds unstability on output voltage (tested of mine).
regards -
Re: My PILAB Project - Alfa Release - Power Unit...
I've used some automation on the Web for calculate the values and the Freq.
with this values at whitch frequency will run?
I' think... the battery start from 14.4 to 11V at minimum discharge value so i've select a middle values for create a minimum +7 on the positive rail.
Yes i must control it again, but the concept was right.Comment
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Re: My PILAB Project - Alfa Release - Power Unit...
PI Discriminator "WOW".Let us know your results when finished. And share the completed or Best Hex programming file. Best of luck , might be a great project , with excellent depth and discrimination . Thank-you Gene L.Comment
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Re: My PILAB Project - Alfa Release - Power Unit...
this IC does not run on fixed freq. it is related on input voltage and load current, so thus may be from N*100 Hz to 100 kHz.
I found IC in China made autocharger for mobile telephone. very cheap all thing - $1. I did think to use it in Automax pinpointer. slightly rebuilded the pcb on step-up voltage... working good and gives 12 V, that I would like to rise a sensitivity... in my case low level is only 4,5-5 V, 50-60 mA of load current. very good result.
yoursComment
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Re: My PILAB Project - Alfa Release - Power Unit...
The load current is almost stable so i've introduced the trimmer to set the output voltage at minimum value, only some volts over the linear regulator LM7805 (that can be replaced with an LM2940 - 5.0 for minimum drop-out voltage)
IMHO i think ther's a better stability when the power source is stabilized on the -10V, so i've select the LM2991, linear, low dropout to reduce the power dissipate by it (and not last, standby capable with the enable pin function )
You can save current (cutting the power for TX driver) when using the kbd for sofware menu-interface. If you're working with kbd you don't need the "search" condition.
What do you think about it?Comment
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