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Cliffliao
4
Apr 1, 2021
checkVerified Buyer
Warning: The circuit layout was incorrect, use it with your own risk.
I purchased this AMP in last year but start to use it since last month. There always have a POP noise while the AMP power on, this is normal because the circuit output have a 1000uf capacitor. I decide to void my warranty and add a switch to avoid the POP noise. Open the case, remove the 3.5MM jack then start the trace the signal path.
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I found there is a PCB layout error exist in one the channel. The hand drawing line are the error in that channel. Can't tell what will happened to your headphone ! If you have solder tool, this can be easy to fix. (I assume you have basic electric know how). Cut the point B resister feet, move to point C then solder it. Anyway, the warranty will expired after April. For those who still interest this AMP, please ask DROP to force the supplier fix this error and better add a output delay circuit on next version. Enjoy ! Cliff
Recommends this product? No
Alberto_T
7
Jul 2, 2021
CliffliaoCould you please put how it was finally?, thanks
Cliffliao
4
Jul 2, 2021
Alberto_TDROP keep on telling me that:
  1. I can't replace my unit because out of the return windows.
  2. I can't get the warranty because I tear it apart.
But I didn't ask for that, all I need is that DROP should talk to the supplier and ask them fix this error and please add an replay circuit on next version. For this request, DROP didn't response.....................................
Rectifier
31
Nov 30, 2021
CliffliaoUnfortunately, your mod instructions are clear as mud.
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