hi!
i already searched A LOT around the forum but couldn't find something specific.
i'm going to build an amp for my subwoofer with about 150 watt into 8 ohms. class b or ab with a fet design.
with chipamps it was easier for me to find something because there are a few popular chips. but with solid state it's really difficult to choose something(n-fet, mosfet, hexfet, bipolar fets .....). to this end i hope someone of you can help me
what i want:
- 150 W / 8 ohms
- 30V or 55V power supply (i can't get any powersupplies between these values or above 55V). i think 55V would be ok?
- good efficiency because it's better with cooling and i also don't need a huge power supply. also costs are not so high then.
- no kit ...
perhaps someone knows a design for me(perhaps also with a pcb layoud)?
aussieamps or project 68 (sound.au.com) seems interresting to me... but i don't know if they would have a little much power for me. 180 watt or so would also be ok
thx
greez
i already searched A LOT around the forum but couldn't find something specific.
i'm going to build an amp for my subwoofer with about 150 watt into 8 ohms. class b or ab with a fet design.
with chipamps it was easier for me to find something because there are a few popular chips. but with solid state it's really difficult to choose something(n-fet, mosfet, hexfet, bipolar fets .....). to this end i hope someone of you can help me
what i want:
- 150 W / 8 ohms
- 30V or 55V power supply (i can't get any powersupplies between these values or above 55V). i think 55V would be ok?
- good efficiency because it's better with cooling and i also don't need a huge power supply. also costs are not so high then.
- no kit ...
perhaps someone knows a design for me(perhaps also with a pcb layoud)?
aussieamps or project 68 (sound.au.com) seems interresting to me... but i don't know if they would have a little much power for me. 180 watt or so would also be ok
thx
greez
hm....i think i would rather use a non-bridged thing.
i also think 55V supply is better for that application?!
this amp will get a monoblock for active driving the sub
i also think 55V supply is better for that application?!
this amp will get a monoblock for active driving the sub
30 volts is only good for less than 100 watts/8 ohm.
Without a second powersupply the max you can expect with a fet output stage on a 30 volt supply is 70-75 watts.
With a 55 volts powersupply 180 watt will work, or a bit more.
Depends on the size of the transformer.
Without a second powersupply the max you can expect with a fet output stage on a 30 volt supply is 70-75 watts.
With a 55 volts powersupply 180 watt will work, or a bit more.
Depends on the size of the transformer.
You can try Rod Elliots new p101
www.sound.westhost.com
thats a mosfet amp which at 55v+- dc should get you about 150 watts.
also, if you can reach him, Anthony Holton's av400 would suit you as well
www.aussieamplifiers.com
but i don't know if he's receiving emails right now...good luck
-Matthew K. Olson
www.sound.westhost.com
thats a mosfet amp which at 55v+- dc should get you about 150 watts.
also, if you can reach him, Anthony Holton's av400 would suit you as well
www.aussieamplifiers.com
but i don't know if he's receiving emails right now...good luck
-Matthew K. Olson
ta get 150W(sinus) on 8ohm you need 63V (unregulated) rail voltages, made by a 90V-CT trafo.
+/-55V is enough for 115W(sinus) on 8ohm.
there is no hearable difference between a 115W and 150W power, so you can do the trick with the +/-55V rails.
+/-55V is enough for 115W(sinus) on 8ohm.
there is no hearable difference between a 115W and 150W power, so you can do the trick with the +/-55V rails.
first of all thx to all of you
hm....should be ac.
115 is a little bit low. i thought of some spare watts. so 150 or a little bit more would be fine.
has anyone tried these amps at 55/30 volts? bcause i'd really like a design that works..... i don't really like the try(trail) and error principle
greez
hm....should be ac.
115 is a little bit low. i thought of some spare watts. so 150 or a little bit more would be fine.
has anyone tried these amps at 55/30 volts? bcause i'd really like a design that works..... i don't really like the try(trail) and error principle
greez
hi!
you, wrote that your psu's are giving 30 and 55volts.
so:
-are these values AC voltages of a trannys secondaies?
-or are they stabilised psu's?
-or they coming after a graetz-bridge and filter caps?
you, wrote that your psu's are giving 30 and 55volts.
so:
-are these values AC voltages of a trannys secondaies?
-or are they stabilised psu's?
-or they coming after a graetz-bridge and filter caps?
eeeer sorry .... i misspelled it. there was a little short in my english.
i meant i can only get 30V or 50V transformers
sorry for that
i meant i can only get 30V or 50V transformers
sorry for that
aaaaaaand i misspelled it again .... seems that i'm a little bit confused at the moment
now the last time and this time the correct values
toroid transformers
rated 2x55V and 2x30V
i'll take a 225VA type 160VA would be too small i think
now the last time and this time the correct values
toroid transformers
rated 2x55V and 2x30V
i'll take a 225VA type 160VA would be too small i think
matth said:
Although recommending something with obsolete output devices might be less than optimal perhaps?
Not obsolete, still have a couple of 135/50.
They are easilly available, but very pricy.
That 47uF cap looks ancient though !
They are easilly available, but very pricy.
That 47uF cap looks ancient though !
O.K. what about about the Holton lateral amp for something a little more up to date. Heres my take:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=19042
http://www.diyaudio.com/forums/showthread.php?s=&threadid=19042
You must be loaded, those Exicons are for millionair diy-ers.
Is that my fav Young One on your avitar ?
Is that my fav Young One on your avitar ?
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