| Electronics > Projects, Designs, and Technical Stuff |
| I am at a loss as to figuring out how to track down this short. |
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| Hextejas:
Re the LM3886 to heat sink to chassis connection, is that correct or not ? The picture seems to say yes, yet I am thinking that you folks don't think so. I am totally lost. |
| Doctorandus_P:
You've bolted the heat sinks with angle irons to the Chassis. I would replace the angle irons with some plastic blocks, Acrylly, Nylon, or 3D print something. Also make sure the sides of the heatsinks can not contact the (side off the) chassis. It may not be absolutely nessacarry to do this for correct operation, but it lessens the probability that horrible things happen when you are poking around with measurement equipment. Alo: A label on the heatsink to remind you that is has a live voltage can be usefull. |
| kripton2035:
you have the chance to have one working unit: use it ! use a multimeter in diode mode, put the red plus probe on the ground of one board, and note the value in different parts of the board then do the same on the bad board, and you will have a better idea of where the problem is, where the values read are different. |
| David_AVD:
Why not just install a mica or silicone insulator pad (with insulating bush) and be done with it? Leaving the heatsink isolated from chassis but "live" is asking for trouble. |
| Hextejas:
--- Quote from: David_AVD on January 26, 2019, 08:25:24 am ---Why not just install a mica or silicone insulator pad with insulating bush) and be done with it? Leaving the heatsink isolated from chassis but "live" is asking for trouble. --- End quote --- I will do that David and thanks for the suggestion. This electronic stuff is very new to me. Could you or anybody tell me how one amplifier board works fine yet the other one produces a short ? They both have the heatsink connected to the chassis. |
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