Re: heat sink upgrade #parts #bitx40

Skip Davis

The reason the Raduino regulator greats so hot is it has to dissipate the heat generated from in your case the 8.8 voltage drop across it. To cool it down you can insert a dropping resistor of about 56 ohms inline with the regulator input from pins 15 & 16 of the Raduino control board. Just cut the trace between those two points and solder in your resistor. You want to select a resistor value that will keep the voltage at the regulator input at about 7 vdc.

Skip Davis, NC9O 

On Apr 24, 2018, at 10:01, davesters@... wrote:

The part that gets hot on both of my bitx radios (40 and micro) is the power supply chip on arduino board. it gets too hot to touch. The PA only get slightly warm after an hour long phone qso. 

I had thin sheet of aluminum that bolted to the power regulator and it is markedly cooler. 

I have not set my radios up for digital 

Run radios both at 13.8v regulated.

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