boost converter test failed

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smallgene
 
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boost converter test failed

Post by smallgene »

I get the beep when it is plugged in. However, when I test the voltage, it only comes out to 8.7 V.
For you convenience, I have attached a picture of the board and the soldering on the back.
Please let me know if there's something amiss.

Thanks for your assistance!
IMAG0505.jpg
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IMAG0504.jpg
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jarchie
 
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Re: boost converter test failed

Post by jarchie »

What is the value of R5? It looks as if you've installed the 10k resistor as R3, which could indicate that the resistors for R5 and R3 were reversed.

smallgene
 
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Re: boost converter test failed

Post by smallgene »

AH that is what's wrong. I managed to take them out, but now the R5 resistor's wire is too short to fit. Should i just pick one up from Radio Shack?

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jarchie
 
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Re: boost converter test failed

Post by jarchie »

That's one option. Another option would be to use one of the cut-off leads from another part. One way to do that would be to solder the 10k into the R5 resistor hole; solder a cut-off from another part in the other R5 hole; loop the cut off around the nonsoldered R5 lead; solder the cut off to R5; and trim any excess wire.

smallgene
 
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Re: boost converter test failed

Post by smallgene »

Unfortunately in the process of trying to remove some excess solder, the lead snapped off the resistor completely. I'll just go to Radio Shack and pick up a pack of R3 and R5 each.

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jarchie
 
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Re: boost converter test failed

Post by jarchie »

Sounds good to me.

smallgene
 
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Re: boost converter test failed

Post by smallgene »

Would there be any way for me to send about $4 for just these two resistors plus the postage for the envelope?
I would be able to transfer money through QuickPay, PayPal, Venmo, Square or whatever else is most convenient.

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jarchie
 
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Re: boost converter test failed

Post by jarchie »

Digi-Key and Mouser both have reasonable prices, although in my experience, shipping is a bit cheaper with Digi-Key.

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jarchie
 
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Re: boost converter test failed

Post by jarchie »

If you're unsure of what to order, I would go with the 10KQBK-ND and 22QBK-ND from Digi-Key. The cost is $0.20 for both resistors, and for me, USPS First Class shipping typically costs between $2 and $4 on small orders. (I live in California.)

smallgene
 
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Re: boost converter test failed

Post by smallgene »

I ordered exactly those two this morning. Took some time to narrow down the choices, but thanks for the confirmation that I picked the right one. Thank you.

smallgene
 
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Re: boost converter test failed

Post by smallgene »

Everything is working fine. Thanks for the help!

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