[sdiy] lm317t diferential input output voltage

[Jay Schwichtenberg]

For the standard LM317 and LM337 you need at least 3 volts head room.

It's in the data sheet somewhere.

Jay S.
-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of dragons
Sent: Sunday, February 23, 2014 1:32 PM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] lm317t diferential input output voltage

Hi,
I just wondered if anyone knew what the lowest difference between the 
input and output voltage should be on a Lm317T ?
I'm working on a piece of equipment that I haven't got the correct mains 
transformer for, and it seems that the temporary transformer I'm using 
is slightly too low in voltage, causing the dc input too be slightly too 
low, which causes ripple on the regulated output, therefore causing hum 
and noise on the audio.
regards Peter B

( P.S. I did look at the data sheet but couldn't find any figures, maybe 
I wasn't looking carefully enough )



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