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Minty-boost USB connector pins 2 and 3 dead
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Re: Minty-boost USB connector pins 2 and 3 dead

by rccpilot on Wed Aug 13, 2014 1:41 am

My Minty-boost lives! Complete and charging and old phone.
Thanks for the help and patience with a newbie.
Ray

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Re: Minty-boost USB connector pins 2 and 3 dead

by adafruit_support_bill on Wed Aug 13, 2014 5:59 am

Congratulations!

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Re: Minty-boost USB connector pins 2 and 3 dead

by clarkj on Thu Oct 09, 2014 1:12 pm

Hi Ray!

FWIW, analog meters (i.e., most ones with a needle to indicate the reading) have relatively low "impedance" -- that is, they can load down the circuit that you're trying to measure. Fortunately, digital meters tend to have a much higher impedance. If you're located in the continental U.S., find out of there's a Harbor Freight Tools near you. Watch their ads -- you can often see coupons to get a basic Digital Multi Meter for free with any purchase (sometimes even with no purchase). It's not a great meter, but hey, the price is right, and in my experience, they're good enough for about 95% of the hobbyist uses.

Clark

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Re: Minty-boost USB connector pins 2 and 3 dead

by kucher on Sun May 19, 2019 7:56 pm

I too have pins 2 and 3 (to pin 4) almost dead. Only getting 0.09 volts from 2 to 4 and 3 to 4 of the USB pads. I am getting 4.98v across pines 1 and 4. Using fully charged Eneloops producing 2.7v (in two pack) or 5.5v (in 4 pack).
Attachments
minty_boost - 3.jpg
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minty_boost - 1.jpg
minty_boost - 1.jpg (174.3 KiB) Viewed 505 times

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Re: Minty-boost USB connector pins 2 and 3 dead

by adafruit_support_bill on Mon May 20, 2019 5:58 am

@kucher -
I am getting 4.98v across pines 1 and 4

So the boost circuit is working correctly. If the voltage on pins 2 and 3 is not correct, it is a problem with how you have installed the resistors. Measure the voltage drop across each of the 4 resistors: R1, R2, R3 and R4.

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Re: Minty-boost USB connector pins 2 and 3 dead

by kucher on Mon May 27, 2019 2:57 pm

hello,

thank you for the quick reply. Please excuse my tardy response.
Here are the readings.

I hope I am doing them correctly:

From + to R1 0.03v 2.75v
R2 0.03v 2.23v
R3 0.03v 2.75
R4 0.03v 2.23v

From - to R1 0.09v 0.0
R2 0.09v 4.99v
R3 0.09v 4.98v
R4 009v 4.98

Thank you for looking into this.

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Re: Minty-boost USB connector pins 2 and 3 dead

by adafruit_support_bill on Mon May 27, 2019 3:08 pm

That sounds half right - but the other half sounds impossible.

For each resistor, measure the voltage between the two ends of the resistor..

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Please be positive and constructive with your questions and comments.