Hi,
After the mains supply 120 to the diodes for rectification the dc voltage goes by qnty 2 100K 3 watt resistors to ground. Then travels to qnty 2 power caps valued at 40uf/ 450 volts. If these two 40 uf caps are wired in parallel what value does the B+1 receive? 80uf? How is the voltage of each 40uf/450VDC cap affected? Reduced?
I am wondering why Ken use two 40uf/ 450VDC caps here rather then qnty one 80uf/450VDC cap.
Thanks!
Decko
Question - Express Schematic:Power caps in Parallel to B+1
Moderators: pompeiisneaks, Colossal
Re: Question - Express Schematic:Power caps in Parallel to B+1
Somebody will have to clean up my answer to you, but here goes....
For starters, the rectifier is not seeing 120VAC, that is going to the primary. The diodes look at the secondary, which is a much higher voltage (depends on which PT you have).
The two 40 mic caps supply a total of 80 mics @ 450 volts.
Why 2 caps instead of 1. That is where I fall short. Price, availability, footprint/space on the chassis, more efficient charge/discharge time? I do not know if the SS diodes care how much filtering they stare at or not. Like I said, somebody with knowledge will have to help you with that.
For starters, the rectifier is not seeing 120VAC, that is going to the primary. The diodes look at the secondary, which is a much higher voltage (depends on which PT you have).
The two 40 mic caps supply a total of 80 mics @ 450 volts.
Why 2 caps instead of 1. That is where I fall short. Price, availability, footprint/space on the chassis, more efficient charge/discharge time? I do not know if the SS diodes care how much filtering they stare at or not. Like I said, somebody with knowledge will have to help you with that.
Re: Question - Express Schematic:Power caps in Parallel to B+1
It's probably what Ken had/would fit. There is also some "mojo" in the surface area of a cap (or two caps in parallel). Physically larger caps seem to sound better than small ones.