On my obligatory lunch break, wondering if an idea could work...
I measured the ripple on the filament dc to the 300b's and measured about 550mv..
have some 1 ohm dropping resistors about to go in to reduce the 6.2 to 5v so will need to recheck but point is i have a little voltage to play with if needed...
if the 5v windings in the ps were out of phase with each other by 180, and converted dc combined, in theory shouldn't the ripple cancel itself leaving a smooth(r) 10v ?
If so, could a voltage divider be used to supply a now more ripple free 5v to each of the heaters??
First chance I get i plan to ac couple both heaters on the o-scope and verify the phase... i already know there's no center tap for the heater winding and dont share a common natural so to speak, imagine that simply revesing the ac conn to the bridge rectifier on one side could work..
Curious what more experienced minds think of all this...
I measured the ripple on the filament dc to the 300b's and measured about 550mv..
have some 1 ohm dropping resistors about to go in to reduce the 6.2 to 5v so will need to recheck but point is i have a little voltage to play with if needed...
if the 5v windings in the ps were out of phase with each other by 180, and converted dc combined, in theory shouldn't the ripple cancel itself leaving a smooth(r) 10v ?
If so, could a voltage divider be used to supply a now more ripple free 5v to each of the heaters??
First chance I get i plan to ac couple both heaters on the o-scope and verify the phase... i already know there's no center tap for the heater winding and dont share a common natural so to speak, imagine that simply revesing the ac conn to the bridge rectifier on one side could work..
Curious what more experienced minds think of all this...
No: if you use FW rectification as normal, there will be no change, and with half wave you will simply turn the ripple into 2*Fmains instead of Fmains. Nothing to be gained, unless you use a 90° phase-shifter, which requires... additional reactive components. There are no free lunches in engineering
That still gets 5V but the ripple is of the opposite phase. Needs separate transformer LV windings,
But the same p-p ripple is still on each heater. Still worth a test, the ripple may be cancelled in the OPT if the amp is PP.
But won't help for SE. Refer to the very good article on this problem when AC is used authored by Steve Bench.
Nope: with a bridge rectifier, the output of phase-reversed inputs is identical (unless the mains has severe even order distortion, which is unlikely)