Electronics Forum: blown (Page 1 of 12)

transistor blown up

Electronics Forum | Wed Jan 02 04:49:44 EST 2019 | robl

Either the extra current draw to overcome inertia on the motor start up, or back EMF from the motor?

transistor blown up

Electronics Forum | Sat Dec 29 01:28:48 EST 2018 | emmamillathompson

We are using a smps for our comm pcb , a relay and a current sensor, which uses 4.2v, 12v and 5v respectively. We are controling one phase of a three phase 5hp water motor. Also smps circuit and relay output are in parallel so output load doesnt effe

Parts being blown out of place during reflow

Electronics Forum | Mon Sep 19 05:54:47 EDT 2011 | kenneth0

Hi Jim, Any ceramic components nearby?

Parts being blown out of place during reflow

Electronics Forum | Sat Sep 24 08:48:53 EDT 2011 | emeto

Try to run it on the mesh. It might help as it will be far rfom the top blowers. Emil

Parts being blown out of place during reflow

Electronics Forum | Sat Sep 24 10:51:04 EDT 2011 | jtownsend

This is a penalized board, 21 up. I tried rotating it 90 degrees and got better results but still had more than have blown out of place. We are looking in to getting the option of speed control for the fans. That is a good suggestion to run on the me

Parts being blown out of place during reflow

Electronics Forum | Fri Sep 16 14:12:23 EDT 2011 | jtownsend

Anyone have experience or advice to help prevent SMT reed switches from being blow out of position during re-flow? We are using a Heller 1707 MK 3. Is it possible to adjust air flow in the oven or do we need to glue before placement??

Parts being blown out of place during reflow

Electronics Forum | Fri Sep 16 19:46:55 EDT 2011 | jlawson

I have seen this on Heller1707 machines also for LED devices. The same job was run on anthoer brand oven (Rehm) and no issue. I think Heller Blower velocity can be a little on higher side as is a low inertia heating system and they have to make up f

counterfeit parts, blown up FETs, part marking removal

Electronics Forum | Wed Jan 09 10:46:17 EST 2019 | rvines1

I've recently seen some TO-220 FETs that appear to be counterfeit parts that have had the marked area resurfaced and remarked with a false part number. I don't know much about semiconductor manufacturing, and I just want to know if there is a type o

counterfeit parts, blown up FETs, part marking removal

Electronics Forum | Wed Jan 09 12:13:38 EST 2019 | robl

Yep, lots of ways to do it and lots of ways to check it. Immediately blacklist the supplier who sent them in to your business. Manufacturers don't need to do this. I've heard excuses such as remarked due to automotive qualification, but normally di

Unknown Reference Designator

Electronics Forum | Wed Mar 18 11:39:06 EDT 2009 | chrisgriffin

Greg, You guys are right, it was a thermistor. I believe the machine was powered up with the wrong voltage. Here is what gets damaged if the transformer is tapped for 230 and you apply 480: 1. Both CPU modules on the MX100 PLC's blown. 2. Both col

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