Step 20: R1 overheats

General discussion and support for the Peaberry SDR V1.

Step 20: R1 overheats

Postby Nazim » Mon Jan 14, 2013 10:00 am

Hello Everyone,

I'm at Step 20 — Receiver (2/2). Everything runs smooth with exception of R1 which gets very hot. It's not going to melt the solder, but it's uncomfortably hot by touch and heats the reverse side of pcb. Current consumption is about 170ma. I'm able to hear the sound of unmodulated harmonic of the test generator and see the signal on Linrads waterfall. Examined the board several times and found no solder bridges. No other elemnts are overheated.

Unfortunately I don't have a digital thermomenter to measure the heat, it's around 80C(176F). Is it nomral that R1 becomes that hot?
I'll check the board once again, to see if there are current leaks.

With Best Regards,
Nazim
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Re: Step 20: R1 overheats

Postby AE9RB » Mon Jan 14, 2013 10:33 am

R1 will get hot. The operating temperature range for a carbon film resistor is -55C to +155C.
73 David AE9RB
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Re: Step 20: R1 overheats

Postby Nazim » Mon Jan 14, 2013 10:49 am

AE9RB wrote:R1 will get hot. The operating temperature range for a carbon film resistor is -55C to +155C.


Hi David. I've lost sleep trying to find out what's possibly wrong with assembly.Thanks for a clear explanation.
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Re: Step 20: R1 overheats

Postby rw6hch » Tue Jan 15, 2013 5:17 pm

I soldered the two resistors of 51 ohms in parallel, they are now less hot
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Re: Step 20: R1 overheats

Postby Nazim » Wed Jan 16, 2013 5:53 am

rw6hch wrote:I soldered the two resistors of 51 ohms in parallel, they are now less hot


Thanks, Boris. I'll do the same. If no 51 ohm smt resistors will be available in a local shops, last resort will be "external" sand 20 ohm.

73,
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