I need to build a PSU for a 4-channel leach amp that will run 4-ohm loads. Leach amp is rated 120W into 8-ohms per channel
Suggested capacitors is one 12,000uF per rail for one channel
It seems that I will need 12,000 uF x 2 x 4 channels = 8 12,000 uF caps?
Do I need to add more caps if I want to run the leach amp into 4-ohm loads?
Main Question - what is the least expensive cap setup (eg. 3 x 4000uf) - I don't mind soldering a lot of caps together.
Suggested capacitors is one 12,000uF per rail for one channel
It seems that I will need 12,000 uF x 2 x 4 channels = 8 12,000 uF caps?
Do I need to add more caps if I want to run the leach amp into 4-ohm loads?
Main Question - what is the least expensive cap setup (eg. 3 x 4000uf) - I don't mind soldering a lot of caps together.
Larger caps will help in transients but they won't save your amp the grief of running continuously into 4 ohms if it wasn't designed for it.
the leach amp was design to handle loads down to 2-ohms. Although not recommended. So I suppose 4-ohms is fine.
I still don't know whether I should have a seperate toroid and psu for each of the 4 channels
I still don't know whether I should have a seperate toroid and psu for each of the 4 channels
"Main Question - what is the least expensive cap setup (eg. 3 x 4000uf) - I don't mind soldering a lot of caps together."
When I've tried to resolve that, it turned out that going either way cost about the same - at least so long as I worked from a catalog such as Mouser or Digikey. If, I could find the right values at tyhre local sdurplus shop then a bunch of smaller caps was somewhat cheaper. What the choice usually comes down to is the height of the enclosure - large screw mount caps have a smaller footprint, I use them is the enclusure is tall enough for them as it make the rest of the component easier ti squeeze in.
"I still don't know whether I should have a seperate toroid and psu for each of the 4 channels"
That may end up being decided by the VA ratings. If you are planning to be driving 4-ohm loads, you may find locating the right size transformer to use for all four is a problem. In which case you will be forced in to using at least two.
I suspect that pratical concerns with respect to the size of the enclosure may play a bigger role than just audiophillic concerns. I keep re-dioscovering that no matter how well I plan a larger enclosure would have been easier to work with.
When I've tried to resolve that, it turned out that going either way cost about the same - at least so long as I worked from a catalog such as Mouser or Digikey. If, I could find the right values at tyhre local sdurplus shop then a bunch of smaller caps was somewhat cheaper. What the choice usually comes down to is the height of the enclosure - large screw mount caps have a smaller footprint, I use them is the enclusure is tall enough for them as it make the rest of the component easier ti squeeze in.
"I still don't know whether I should have a seperate toroid and psu for each of the 4 channels"
That may end up being decided by the VA ratings. If you are planning to be driving 4-ohm loads, you may find locating the right size transformer to use for all four is a problem. In which case you will be forced in to using at least two.
I suspect that pratical concerns with respect to the size of the enclosure may play a bigger role than just audiophillic concerns. I keep re-dioscovering that no matter how well I plan a larger enclosure would have been easier to work with.
- Status
- Not open for further replies.