D4D Step 2 Failure
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Dr. Pedro E. Colla (LU7DID)
Hi,
Building the D4D at Step 2 WITH the MOD on pag 25 implemented when testing the step upon powering the circuit the relay clicks but the amber LED goes and stays on. On previous STEP 1 testing the green LED went ON correctly. Any hint? 73 de Pedro, LU7DID
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Adam Rong
Colla,
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Sorry for replying late. Check if you have swapped Q5 and Q6. 2N3906 and 3904 are very similar looking. Thanks, Adam
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Dr. Pedro E. Colla (LU7DID)
Hi Adam,
Thank you for your quick response. It turned out to be a cold soldering point on R16 GND side. 73 Pedro, LU7DID
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