You mean 1 ohm resistors? Not my design, only following a scheme. Maybe they are there to help split supplies and lower noise or hum, huh?
The problem with this design is that the current will return from the left ground to the right ground via the amp circuit. Expect hum.
The 1 ohm resistor at each amp supply ground is TERRIBLE.
These are all approximations to grasp a magnitude idea of what we are getting into:
Suppose left amp is putting 40V peak into a 4 ohm load, that means 10A peak, which will discharge its capacitorsa certain amount.
Then in the next charge cycle transformer and rectifiers will have to recharge caps to earlier level, so we can assume a charge pulse in the order of 10A too.
Capacitors do not create current, just deliver what has been put into them.
So left 1 ohm resistor will drop a 10A*1 ohm peak voltage of 10V 😱
Which will inevitably be coupled into right channel ground, so into everything.
Same problem applies to Right channel in the symmetrical case .... terrible.
From experience, having a single transformer winding feeding two amps each with their own filtering causes hum problems very hard to correct, precisely because pulses charging two "ground separated" capacitor banks drop significative voltage across the wire or track resistance joining both, injecting said voltage into respective grounds (and this power supply does that ON PURPOSE 😱 ), I have usually solved it by joining all caps, both halves, into a single large capacitor bank, calling its ground node "THE" system ground, and returning all grounds to it: amp grounds, speaker returns, and specially transformer center tap.
These are all approximations to grasp a magnitude idea of what we are getting into:
Suppose left amp is putting 40V peak into a 4 ohm load, that means 10A peak, which will discharge its capacitorsa certain amount.
Then in the next charge cycle transformer and rectifiers will have to recharge caps to earlier level, so we can assume a charge pulse in the order of 10A too.
Capacitors do not create current, just deliver what has been put into them.
So left 1 ohm resistor will drop a 10A*1 ohm peak voltage of 10V 😱
Which will inevitably be coupled into right channel ground, so into everything.
Same problem applies to Right channel in the symmetrical case .... terrible.
From experience, having a single transformer winding feeding two amps each with their own filtering causes hum problems very hard to correct, precisely because pulses charging two "ground separated" capacitor banks drop significative voltage across the wire or track resistance joining both, injecting said voltage into respective grounds (and this power supply does that ON PURPOSE 😱 ), I have usually solved it by joining all caps, both halves, into a single large capacitor bank, calling its ground node "THE" system ground, and returning all grounds to it: amp grounds, speaker returns, and specially transformer center tap.