rds
Headphoneus Supremus
- Joined
- May 4, 2008
- Posts
- 2,045
- Likes
- 31
Any idea why we don't see (buffered) precision shunt regulators being used to create virtual grounds?
Any idea why we don't see (buffered) precision shunt regulators being used to create virtual grounds?
It would seem that the advantage of the TLE2426 or the resistor divider is that they track the rail as it droops on battery. If you have stable rails on line power, it would seem fine to use a shunt. But then again, if you are on line power, I don't see why you just don't use a dual rail power supply.
You mean like the TL431?
Maybe we are too used to using TLE2426 or
just a pair of resistors....
With a battery powered portable I would be very cautions about anything that makes the amp less efficient. Unless you can prove that its an improvement (class-A biasing opamps for example) its probably just wasteful.
For stationary stuff, regulators are nice. I guess the question becomes why not do away with the battery and regulate an inefficient, but VERY well thought out wall power supply? When you look at it from a truly maximum effort standpoint battery power supplies are simply cheaper than solving the problems of building a real power supply.
TLV431 is not rated for particularly high maximum voltage (7V absolute max, 6V recommended). It wont work in most headphone amps.
I think as mentioned people have historically used the TLE2426 or resistor divider because it splits the rails symmetrically every time. I happen to think people place far too much emphasis on maximum voltage swing, but symmetrical rails gets you the most swing out of most push-pull SS circuits.
TLV431 is not rated for particularly high maximum voltage (7V absolute max, 6V recommended). It wont work in most headphone amps.