Quote:
Originally Posted by Jazper
The voltage reference given in P-A's stock part list is LM431, he says the LM329 is better, so based on that, that's what I'm going to use.
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First we are talking about industrial parts so if the industry wants to pay more for something it must add a certain value.
So in the case LM329 and LM431 there are differences'
LM329, 199, 399 is no precision part when it comes to absolute accurecy. The major good parameter is low noise and it's also mentioned and specified in the datasheet although pretty rough, 7-100 uV! The very good thing about LM329 is very low temperature coefficient which is rather unimportant in audio.
The bad thing (sometimes) is that it can't be adjusted.
LM431 hasn't got any noise data but it is higher, still in real life with LP-filter the regulator has pretty low noise, way better than needed in most cases.
So if you want more than 6.9 volt and a very temperature stable output voltage LM329 is OK. If you want to save same money and in the same time want voltages från 2.5 V and up and also want to be able to tune the voltage in an easy way LM431 is to prefer.
Strict technically LM431 together with some additional parts is way better than any regular 3-pin regulator which is normal in high-end!
.... so if you want more than 6.9 volt LM329 is excellent but LM431 is quite enough.