Re: supply voltage aleph-x
I would like to use +/-18V olso...so any toughts what to change ???
Chois¢â said:Hi
This is my second project about aleph.
I want to change the supply voltage +/-22V to +/-18V.
What parts should I change on circuit?
Thanks
I would like to use +/-18V olso...so any toughts what to change ???
Banned
Joined 2002
Nixie said:Since the IRFP240 flanges are coinnected to the drains, can I mount all on one side and half to copper bus bars without insulation, and put the insulation between the copper bus bars and heatsink?
NO don't do that.. You should buy some ceramic isolation pads. Do you want a pic of what they look like ?
Jase
Banned
Joined 2002
Banned
Joined 2002
That still doesn't answer my question, what exactly is wrong what I suggested? If I have 12 devices per channel, the drains of the four 3x pairs are all connected together in the schematic. So why do you think they flanges should not make contact with each other through a piece of copper bus bar (that's itself insulated from the heatsink)?
Nixie said:. . . having the paralleled ones on the same bus (3x). They're already connected at the drains anyway.
You would hardly see what is wrong.
I wonder how you are going to plan the electrical insulation
and thermal conduction between the bars and the heat sink.
If you have any solution to this question. . . why not. . . ?
Getting started...transformers and boards
I have two 1000VA 35v secondary Plitron transformers at home that I bought about five years ago. I took them out recently and decided that I would like to build a power amplifier with them. I searched the forums and have done quite a bit of reading over the last four weeks on the SKA, Aleph-X, and various ChipAmps. I haven't found anyone using the transformers that I have with the Aleph X but would like some guidance as to how appropriate they are for the job as well as a possible source for boards to ease construction. if they are not going to work, perhaps a suggestion as to what project to build as it seems a waste to not use my big beautiful heavy chunks of copper for something.
Thanks!
I have two 1000VA 35v secondary Plitron transformers at home that I bought about five years ago. I took them out recently and decided that I would like to build a power amplifier with them. I searched the forums and have done quite a bit of reading over the last four weeks on the SKA, Aleph-X, and various ChipAmps. I haven't found anyone using the transformers that I have with the Aleph X but would like some guidance as to how appropriate they are for the job as well as a possible source for boards to ease construction. if they are not going to work, perhaps a suggestion as to what project to build as it seems a waste to not use my big beautiful heavy chunks of copper for something.
Thanks!
Re: resistors
uncommon?
nope- common values in 1% metal film - E48 (is it ?) nomenclature
tenderland said:Hello , Pardon me for this rudementary question. I am in the process of digesting Grey Rollins original 15v Aleph x schematic and was wondering about some of the resistor values... 392 ohm,221 ohm, 68.1k ohm. How do you obtain these uncomon values?
J
uncommon?
nope- common values in 1% metal film - E48 (is it ?) nomenclature
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