[sdiy] Microphonic PCB

[Tom Bugs]

Sorry, by current caps I mean the ones currently in place rather than 
current in electronic terms!
Cheers, Tom

On 04/02/2011 10:57, karl dalen wrote:
> Wierd!
> Gain should be fairly high to amplify ceramics.
> When you say current caps what do you exactly
> mean by that? The function?
>
> regards
> KD
>
>
>
>> Hi all,
>>
>> I'm scratching my head and wondering if anyone has some
>> insight to help.
>>
>> I have a prototype made up using mainly standard SMD parts
>> (the main components used are: 0805 resistors, 0805&
>> 1206 ceramic multilayer caps, MLL34 silicon diodes and some
>> dual shottkys, and SOIC TL074s)
>>
>> I am able to tap the PCB and hear it!
>> (obviously not very good)
>>
>> Recently I was informed by Mr.G.Richter that SMD ceramic
>> caps tend to be microphonic - you won't tend to notice it
>> unless there is some amplification going on.
>> Well, as the first stage of the PCB offers amplification I
>> figured I should swap out the current caps and solder in
>> some poly-box ones (no, it doesn't look all that neat!)
>> The microphonics still remain..
>>
>> Are other parts microphonic?
>>
>> Cheers for any insight!
>> Tom
>>
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>> UK company No. 07199808
>> VAT No. GB 988 2629 57
>> 1 Ninetree Hill
>> BRISTOL BS1 3SB
>> United Kingdom
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>>
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>
>
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-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk