hum

Jul 18, 2004 2 Replies
M

=_NextPart_000_0034_01C46D21.5D6205F0 Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: quoted-printable



Hi,



I've build the riaa preamp from here:

formatting link
and the dual power supply that feeds it from here:
formatting link
(I've used 7809 and 7909 instead of the 15v regulators)



If I feed the preamp with two 9v batteries, all is ok. However, using the above power supply there's a strong hum noise.



Anyone can help ?



Thanks!



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M

=_NextPart_000_016D_01C46D75.D78734A0 Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: quoted-printable

Hi,

I've build the riaa preamp from here:

formatting link
and the dual power supply that feeds it from here:
formatting link
(I've used 7809 and 7909 instead of the 15v regulators)

If I feed the preamp with two 9v batteries, all is ok. However, using the above power supply there's a strong hum noise.

Anyone can help ?

Thanks!

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J

I read in sci.electronics.design that Marius Kaizerman wrote (in ) about 'hum', on Mon, 19 Jul 2004:

See my other reply. Have you taught it the words, though? (;-)

Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
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