....bipolar electrolytics can be used "either way around" and are often=20
used to AC-couple (i.e. block DC) in audio applications.  Nichicon and=20
panasonic make them, and I'm sure many others do too.  Useful to have in=20
the 'junk drawer'.

J


Bob Blick wrote:
>
>
> On Tue, 08 Mar 2011 00:50 -0500, "V G"  wrote:
>> The output from my ECG (instrumentation amplifier) has somewhat of a DC
>> bias
>> to it.
>>
>> I would like to get rid of that DC bias and apply a low frequency high
>> pass
>> filter of about 0.3 Hz to it.
>>
>> However, filters for such extreme values tend to require high ceramic
>> capacitor values of 1 or 10 uF to avoid impedance issues and I'm
>> SERIOUSLY
>> having trouble finding these capacitors at a reasonable price anywhere.
>> Or
>> is there ANOTHER type of capacitor I can use (not ceramic)?
>
> You can use electrolytic capacitors. Just make sure you put them in the
> right direction or they will conduct.
>
> Cheerful regards,
>
> Bob
>

--=20
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