Help - not getting high voltage / not detecting

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Dellinite
Posts: 1
Joined: Tue Jun 02, 2015 9:37 pm

Help - not getting high voltage / not detecting

Post by Dellinite »

I have tried all the troubleshooting topics first

Checked connections reflowed solder
Checked component installation
TP1 to ground gives single click + red led flash
No click or red led flash if I short across the Geiger tube

I was getting a weird triple? click red led flash once a second if I shorted the negative terminal of the Geiger tube to the second pin to the right on the serial jumper

Any ideas?

Can I exchange for a working board?
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mightyohm
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Joined: Fri Apr 03, 2009 10:29 pm
Location: Seattle, WA
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Re: Help - not getting high voltage / not detecting

Post by mightyohm »

Can you hear a whine from the speaker?

Have you checked the voltages on the 555 (U1)?
Examples here: http://www.mightyohm.com/forum/viewtopi ... t=10#p5489
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