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Old 16th October 2011, 02:40 PM   #61
avr300 is offline avr300  Denmark
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Coris, you have to remember, that when you're in Vendor Forums, the vendor has the moderation right. They do pay for being there.

Why don't you post your power supply problems over at TP own support forum. Someone might help you over there.

Sorry for polluting your threat.
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Old 16th October 2011, 03:19 PM   #62
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Coris, I don't mind answering questions when posted with a good attitude, you just need to be much more respectful in your approach and tone. Part of that means not posting off topic. We have threads on placid. We also have a support forum.

First, neither of the power supplies you tested are stock. Second, the compensation scheme for both is designed with a capacitive load in mind. Try again with say47-100uf at the outputs. The reason for this is because of they are designed to work with our modules which will present such a load.

The non-HD placid is especially also *not* designed for the load you were testing it under. It was designed for < 250ma use. It can be used for more, but requires some component changes to do so.

A little respect and etiquette will take you a long way toward getting answers.

Cheers!
Russ
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Last edited by Russ White; 16th October 2011 at 03:31 PM.
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Old 16th October 2011, 03:22 PM   #63
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But anyway... I look forward to "hear" about your new experiments with different decoupling ways, caps types, and so on...
Me too.
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Old 16th October 2011, 05:19 PM   #64
Coris is offline Coris  Norway
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Originally Posted by Russ White View Post
Coris, I don't mind answering questions when posted with a good attitude, you just need to be much more respectful in your approach and tone. Part of that means not posting off topic. We have threads on placid. We also have a support forum.

First, neither of the power supplies you tested are stock. Second, the compensation scheme for both is designed with a capacitive load in mind. Try again with say47-100uf at the outputs. The reason for this is because of they are designed to work with our modules which will present such a load.

The non-HD placid is especially also *not* designed for the load you were testing it under. It was designed for < 250ma use. It can be used for more, but requires some component changes to do so.

A little respect and etiquette will take you a long way toward getting answers.

Cheers!
Russ
Sorry, but you can not talk to me about my missing respect to the TPA team, when you just delete quite systematic my posts. This is much unrespectful then my trying to get an explanation about a sold TPA product which did not function as expected.
You could very well answer to my post like you did here (except the "respect" chapter...), and maybe add that is not right place to post such subject on Buffalo 3 thread... Without just delete at once that post (as many before). There was many time before, many posts in the Buffalo thread which didn`t belonged exclusively to the Buffalo 3 theme. Nothing was deleted, but answered, explained.
I think you misunderstand what you name it "etiquette". As usually, are they who run a business, they who show first respectfulness for they who benefit of that run it business... This as a quite old principle world wide... No way to teach me about this.

I just had all the time a very good attitude, I trusted your way to do it in this field, and had full respect for your work. But unfortunately I have to experience your quite inappropriate way to accept the critic, or somebody else opinion.

I do not understand very well what you mean by "non stock" Placid. The assembled kits you have seen in my pictures was bought from TPA, and was assembled without any modification exactly as the kit provided. What do you actually mean "are non stock"? It is not TPA who made/sell this kit?

About the capacity on the PSU output (in the system/device) may be very clear précised about in the respective manual. When I came with the idea to use quite large decoupling capacities, so at least on the output of shunt regulators, you react immediately and almost called that a silly/stupid idea...
You have to know that I just assembled the Placid kits for use it to supply the Buffalo board. This problem I`ve came on with Placid oscillations was in direct connection with Buffalo use and not about any other experiments.
Sorry, but I had to tested Placid PSU before connected to Buffalo module... You may accept this procedure...

Last edited by Coris; 16th October 2011 at 05:35 PM.
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Old 16th October 2011, 05:48 PM   #65
Coris is offline Coris  Norway
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Originally Posted by avr300 View Post
Coris, you have to remember, that when you're in Vendor Forums, the vendor has the moderation right. They do pay for being there.

Why don't you post your power supply problems over at TP own support forum. Someone might help you over there.

Sorry for polluting your threat.
Thanks for your explanation... I can well understand this. The only problem in this case is that the moderation have to be quite moderate... I`m not any concurrent who target to destroy that Vendor`s business...

Else, this problem with an bran new kit which oscillate after it is assembled is clear that is not only my problem... The information about one have to connect an important capacity on output or have this in the supplied device, have to be very clear précised.
The another Placid which I`ve claimed about in my posted post, had more than 20mV noise on output (with load) and more than 400mV without load... This could definitively not be my fault...

Last edited by Coris; 16th October 2011 at 06:10 PM.
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Old 16th October 2011, 06:20 PM   #66
avr300 is offline avr300  Denmark
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Quote:
Originally Posted by Coris View Post

I do not understand very well what you mean by "non stock" Placid. The assembled kits you have seen in my pictures was bought from TPA, and was assembled without any modification exactly as the kit provided. What do you actually mean "are non stock"? It is not TPA who made/sell this kit?
To me it looked like you have capacitance on both sides of the PCB. Definitely not stock.

I could be wrong. Though I did see that you have nice measurement gear.
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Old 16th October 2011, 06:29 PM   #67
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This is very definitely not a stock placid.
Attached Images
File Type: jpg PLACIDv2.0.1b.jpg (159.0 KB, 430 views)
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Old 16th October 2011, 09:36 PM   #68
Coris is offline Coris  Norway
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This is very definitely not a stock placid.
Yes, I can agree that this board do not looks very well now, like a new stock one. This do not mean that is modified the design on it or changed the components values. There was a space/place problem and few caps are replaced with the same value but ceramic type. This Placid do not oscillate, but have a quite big noise level on output (27mV-300mA load/400mV-no load).
The another one is the big problem. Placid HD is very stock one. Build it as the kit provided. Only have a double filter capacitor on input (20000µ). This one have 5vpp/250Khz on output... With/without load. This is happen on low output current, and up to 400mA (set-up VR1), on 5,5v.
I will try to find out why...

Anyway the main aspect in all this was another one... The explanation, which I`ve asked in my (deleted) post, and can come out of this case can be maybe usefully for other members here... So I can hardly see the meaning with a very quick deleting of that post...
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File Type: jpg PlacidHDb.jpg (156.7 KB, 400 views)
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Old 16th October 2011, 09:40 PM   #69
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Awaiting your post in the support forum...
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Old 16th October 2011, 10:41 PM   #70
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Quote:
Originally Posted by Coris View Post
Yes, I can agree that this board do not looks very well now, like a new stock one.
Yet you said it was...

Quote:
I do not understand very well what you mean by "non stock" Placid. The assembled kits you have seen in my pictures was bought from TPA, and was assembled without any modification exactly as the kit provided. What do you actually mean "are non stock"? It is not TPA who made/sell this kit?
So what are we to make of this?

Your posts would have been welcomed in the correct forum or even in our vendor forum under the right thread.

Now I must say after your clear fabrication I am not sure you are welcome at all.

If you indeed have good will, you must more clearly demonstrate it.
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