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Old 24th September 2009, 01:49 AM   #1021
Tham is offline Tham  Malaysia
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Had been trying to get a response from Rhys about the status of my Phonoclone 3 part kit but receive no reply.

My order is still in the Not Ship list in the wiki and would like to know if the kit is now with P-A. I would like a refund if it is not.
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Old 24th September 2009, 04:01 AM   #1022
pchw is offline pchw  United States
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By any chance, we will see the missing OP27 or partial refund??
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Old 24th September 2009, 04:37 AM   #1023
Electrons are yellow and more is better!
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I'm working for that all people should get their stuff or get a refund
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Old 24th September 2009, 04:41 AM   #1024
Electrons are yellow and more is better!
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Quote:
Originally Posted by Tham View Post
Had been trying to get a response from Rhys about the status of my Phonoclone 3 part kit but receive no reply.

My order is still in the Not Ship list in the wiki and would like to know if the kit is now with P-A. I would like a refund if it is not.
Right now I have two incomplete Phonoclone kits. That's all I have at home right now. Depending on how much money I'll get from Rhys I'll maybe buy the parts myself.
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Old 24th September 2009, 04:49 AM   #1025
Tham is offline Tham  Malaysia
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Thanks P-A . Let me know how it goes then.
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Old 29th September 2009, 04:17 PM   #1026
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Any updates on that second box from Rhys?
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Old 1st October 2009, 02:47 PM   #1027
Electrons are yellow and more is better!
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Unfortunately not. Rhys was on his way to the post office when I called him (he was outside at least) but some made that the package/letter never got sent. It should have been at my place last Friday. I have tried to call him every day since a few days back and the phone is on but he doesn't answer. A few minutes ago the phone was switched off (batteries could be discharged also). When you have a mobile phone you can't say that you haven't seen 5-10 missed calls so he is fully aware of I have called. It's possible that there is a possible explanation.
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Old 1st October 2009, 05:51 PM   #1028
shmulik is offline shmulik  Israel
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Quote:
Originally Posted by tryonziess View Post
PA,


Anyone finish there bpa300 projects yet?

Tad
I'm in process of building 4 PA150. I connected to the power supply. 3 boards remained cool. one fried! I don't know at the moment what caused it but the second you connect it to power one of the LMs is smoking while the others are EXTREMELY hot. I'm trying to take the smoking one out but it is far from simple. I will have to have his pins cut. Luckily I ordered more than the 12 required to complete the project. However, I don't have a clue yet to the cause of this.
I cannot spot any shorts to ground on the output.
After the offending LM is taken out, the other two are still getting warmer than those in the other boards (somewhat hard to compare though, because all other LMs are attached to a massive heatsink while the examined LMs only reside near it).
I now have two things to consider:
was the offending LM faulty from packing or is there something in the PCB (other component, hidden short) that wrecked it?
have the other two co-LMs suffered damage due to the ill behaving one and should be also replaced (hard work and potential damage to the PCB)?

your thought and ideas are welcomed.
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Old 1st October 2009, 08:15 PM   #1029
Electrons are yellow and more is better!
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My advice here is to omit the output resistors and test all the three LM3886 unconnected. And after power up measure the output offset voltage. The real cautious person should solder one LM3886 at the time and test each one. It's extremely important to make sure the gain is exactly the same for all three LM3886. My guess is that you may have missed to place the passives correctly.

How do they get hot? Do you have currents in the series resistors?
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Old 1st October 2009, 09:31 PM   #1030
shmulik is offline shmulik  Israel
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P-A,
After removing the burned LM, I run the circuit with only two LMs and even brought the CD offset of one of them to 0V using the trimmer. however, being worried by the rising temperature (one can touch the chip but I did not want to wait to the point it gets hot beyond touching - lost my nerves here!), I switched the PS off after that.
you are absolutely right about working step by step. However, as one who is coming from the software world, and being impatient, I used the "success oriented" approach. in software you burn no components, only your time in searching for a bug you just wrote. obviously here this approach does not apply. I did my best to compare the placement of the passives to the scheme, mask and other PCBs. at least all resistors are in correct places. the capacitors are impossible to identify so I don't know.
I don't know how to tell if the other LMs are damaged. the only evidence I have that something is abnormal is the temperature. I also somewhat reluctant to solder the output resistors as it took a fair amount of heat to melt the solder beneath it. I need a way to make sure the circuit is working without connecting it
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