How much cap per one amp.....seems like 2mf for every amp....
it is a unregulated power supply i am building out of two matching transformers of seventy amps each at 14 volts......so i need how much cap for this project of mine. 140 amps I hope will power eight 2879"s. best i can remember the volts will go up a little when changing to dc.
I have this type of power supply built in my dave made 2x4 base amp. It has worked out great.
new info: I listened to bob and put 12 23000 caps in. When I FIRE it up will post again.
Using twin (my dave made uses three smaller ones)transformers at 75amps ac each. I also have the option of 220 primary that will do even more and taps to dial it in just right. I want 20 volts or so because it being unregulated it will drop 3-5volts at key up.
something else to consider is your house wiring. I ran a 12-2 from my breaker box to my dave made 2x4 and that amp came alive. If you shack is far from the box go to 10 gauge. all I use this outlet is my amp. I will always put an voltage meter on my base amps power supply from now on. I can.t see why they charge about a dollar a watt for most powersupplys. I took two old rack mount units and stripped them .....bolting and rivetting them together. all the dc runs in parallel. the ac on my rectifers is two groups ...each trans has four of them per transformer in parallel. the caps are just parallel at the end of the circuit and guess what......dc.......oh yea i put a 100disk cap and a reisistor across each rectifers two ac connectors(this keeps the ac slightly loaded. the only thing not in parallel is the recitfires are in two groups not letting the seconary ac mix from each transformer before it becomes dc.( bob if you read this you can explain it better than I)....heat paste and bolted to a large alum. shelf in my case.......we may make fire but my son is a fireman.
I found several transformer places......this is where you save your money. I hope the only battery I have to look at is in my car....not under my bench. sorry about my rambling...i am tired and will edit it later. I am going to share everything like this to anyone that wants it. I had to dig and dig and ask questions. out of here.............................davis
once again thanks for helping
davis
it is a unregulated power supply i am building out of two matching transformers of seventy amps each at 14 volts......so i need how much cap for this project of mine. 140 amps I hope will power eight 2879"s. best i can remember the volts will go up a little when changing to dc.
I have this type of power supply built in my dave made 2x4 base amp. It has worked out great.
new info: I listened to bob and put 12 23000 caps in. When I FIRE it up will post again.
Using twin (my dave made uses three smaller ones)transformers at 75amps ac each. I also have the option of 220 primary that will do even more and taps to dial it in just right. I want 20 volts or so because it being unregulated it will drop 3-5volts at key up.
something else to consider is your house wiring. I ran a 12-2 from my breaker box to my dave made 2x4 and that amp came alive. If you shack is far from the box go to 10 gauge. all I use this outlet is my amp. I will always put an voltage meter on my base amps power supply from now on. I can.t see why they charge about a dollar a watt for most powersupplys. I took two old rack mount units and stripped them .....bolting and rivetting them together. all the dc runs in parallel. the ac on my rectifers is two groups ...each trans has four of them per transformer in parallel. the caps are just parallel at the end of the circuit and guess what......dc.......oh yea i put a 100disk cap and a reisistor across each rectifers two ac connectors(this keeps the ac slightly loaded. the only thing not in parallel is the recitfires are in two groups not letting the seconary ac mix from each transformer before it becomes dc.( bob if you read this you can explain it better than I)....heat paste and bolted to a large alum. shelf in my case.......we may make fire but my son is a fireman.
I found several transformer places......this is where you save your money. I hope the only battery I have to look at is in my car....not under my bench. sorry about my rambling...i am tired and will edit it later. I am going to share everything like this to anyone that wants it. I had to dig and dig and ask questions. out of here.............................davis
once again thanks for helping
davis
