Im building the AVT 471 headphone amplifier, but cant understand the manual, so im hopeing for some help from you polish fellow DIY:ers
I want to use this amp with low impedance earphones (grado 32ohm)
So im planning to lower the gain from 10 to 5 by lowering R5&R15 to 4.7k
Im also changeing the R2&R12 to about 100k, which should be good when used with 100k log potentiometer.(?)
Has anyone here experience with this amp and low impedance phones, what does the manual say?
How important is +-10V? Is it possible to use higher/lower rail voltage?
Not knowing the total mA used, would it be any idea to try 2x9V batteries?
Thank you for your help!
/kasra
Manual:
http://www.ep.com.pl/pobierz.php?id=11747
Schematic:
http://www.cyfronika.com.pl/kityAVT/AVT471sch.HTM