hi,
i'm planning to do a multi-supply-psu, and want to use a voltage doubler for 44v and 48v, in conjunction with a 28v ac xformer and a TL 738 or LM317HV as V.reg's. (i had actually started another thread for this, but with much more general questions (and not too many answers really), so this is what it actually comes down to)
the doubling circuit i want to use is an adaption of the quadroupling circuit ("double doubling") used in the gyraf g9 psu section: http://www.gyraf.dk/gy_pd/g9/g9_sch.gif
(sorry, can't find a url of a "single" doubling circuit, but it should become clear what i mean)
now my questions are
1. how big should the caps in the doubling section be for 400 to 500 mA? the larger, the better? or is a large charging cap (the one that sits right at the input of the v.reg) all that matters?
2. is a voltage doubler suitable for that much current at all (in terms of stability, unloading the caps, etc.), or should i rather use a xformer which puts out the appropriate voltage in the first place
3. should i use tl738 (like i read, no cap on the reg. leg) or lm317hv?
thanks a bunch people :thumb:
i'm planning to do a multi-supply-psu, and want to use a voltage doubler for 44v and 48v, in conjunction with a 28v ac xformer and a TL 738 or LM317HV as V.reg's. (i had actually started another thread for this, but with much more general questions (and not too many answers really), so this is what it actually comes down to)
the doubling circuit i want to use is an adaption of the quadroupling circuit ("double doubling") used in the gyraf g9 psu section: http://www.gyraf.dk/gy_pd/g9/g9_sch.gif
(sorry, can't find a url of a "single" doubling circuit, but it should become clear what i mean)
now my questions are
1. how big should the caps in the doubling section be for 400 to 500 mA? the larger, the better? or is a large charging cap (the one that sits right at the input of the v.reg) all that matters?
2. is a voltage doubler suitable for that much current at all (in terms of stability, unloading the caps, etc.), or should i rather use a xformer which puts out the appropriate voltage in the first place
3. should i use tl738 (like i read, no cap on the reg. leg) or lm317hv?
thanks a bunch people :thumb: