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D4D Step 2 Failure

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

Adam Rong
 

Colla,

Sorry for replying late. Check if you have swapped Q5 and Q6. 2N3906 and 3904 are very similar looking.

Thanks,
Adam

在 2019年10月14日,上午7:48,Dr. Pedro E. Colla (LU7DID) <lu7did@...> 写道:

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

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