3 ms·
Can anyone comment on what's going on with the ground channel in the circuit here? Seems like you would want to tie the input ground to the virtual ground betw
by twtw 8y ago
Can anyone comment on what's going on with the ground channel in the circuit here?
Seems like you would want to tie the input ground to the virtual ground between the two 9Vs and then maybe buffer the output ground, but this circuit doesn't do that - it just replicates the L/R chains twice between grounds.
Also, what's the point of adding the two 9Vs and then splitting them again with the two 1k resistors? Why not just pull ground from in between the two 9Vs?
- s800 8y agoDoesn't make any sense to me either. He's burning 2ma for no reason.
- deleted 8y ago[deleted]
- opencl 8y agoThe duplicated amplifier as ground design is pointless and pretty much strictly worse than using a normal ground, but has somehow become semi-popular among certain misguided parts of the audiophile community. Good article about it here[1]. The problem with just using the middle of the batteries as ground is that it creates a potentially headphone-damaging DC offset if the batteries drain unevenly for whatever reason. The resistor bridge is the simplest way to avoid this problem, though there are lots of ways to create a dual rail power supply with various tradeoffs[2]. [1] http://nwavguy.blogspot.com/2011/05/virtual-grounds-3-channel-amps.html http://nwavguy.blogspot.com/2011/05/virtual-grounds-3-channe... [2] https://tangentsoft.net/elec/vgrounds.html https://tangentsoft.net/elec/vgrounds.html