Hi,
push pull presumably?
+-22Vdc rails will give about 17W into 8ohm at 60 phase angle. The output bias current needs to be about 1100mA (24W/FET) for full classA into 8r.
It will go to 25W into 4r at 55 degree phase angle but most of this is classAB, unless you increase the bias to 1800mA (40W/FET, very hot!).
Try a simple ClassAB design modified to high bias. If you like the sound you will only have to change the voltage amp PCB for another and the cost will be quite low. The big cost is in the PSU, sink and case.
At these very high temps it might be worth thermally coupling the bias control to the output sinks. Even using radiation coupling might be enough to start cutting back on the bias as the temps come up. I have 400mA on a resistive bias control and it appears OK.
push pull presumably?
+-22Vdc rails will give about 17W into 8ohm at 60 phase angle. The output bias current needs to be about 1100mA (24W/FET) for full classA into 8r.
It will go to 25W into 4r at 55 degree phase angle but most of this is classAB, unless you increase the bias to 1800mA (40W/FET, very hot!).
Try a simple ClassAB design modified to high bias. If you like the sound you will only have to change the voltage amp PCB for another and the cost will be quite low. The big cost is in the PSU, sink and case.
At these very high temps it might be worth thermally coupling the bias control to the output sinks. Even using radiation coupling might be enough to start cutting back on the bias as the temps come up. I have 400mA on a resistive bias control and it appears OK.
Search for "zenquito" here in the forums.
I´m pretty sure somebody built a HT amp with it.
You can adjust power output and bias by choosing your voltage rails.
See here:
http://perso.wanadoo.fr/jm.plantefeve/sche.html
I´m pretty sure somebody built a HT amp with it.
You can adjust power output and bias by choosing your voltage rails.
See here:
http://perso.wanadoo.fr/jm.plantefeve/sche.html
Hi,
for all your transistor needs in the UK, start your enquiry with http://www.dalbani.co.uk Excellent pricing, enormous range and good service.
for all your transistor needs in the UK, start your enquiry with http://www.dalbani.co.uk Excellent pricing, enormous range and good service.
Linear Systems of the US is now making these
LSK170 and LSK389
Check their web site.
http://www.linearsystems.com/
Look at dddac.de.
He has made several very nice things and a mosfet amplifier wich can be used as a poweramp, or a integrated amp (then use a tube !!!) Yes it is a hybride amp. At the moment I am playing with a tube preamp (just finished the latest version) and the mosfet-poweramp.
Look alos at my site at the TUMOS-project (sorry it is written in dutch but the pictures show everything).
Oh and DDDAC is selling also PCB (without profit just for diy'ers)
for TUMOS see this link: http://dddac.de/op06.htm
succes,
and happy newyear and al the best for 2006
He has made several very nice things and a mosfet amplifier wich can be used as a poweramp, or a integrated amp (then use a tube !!!) Yes it is a hybride amp. At the moment I am playing with a tube preamp (just finished the latest version) and the mosfet-poweramp.
Look alos at my site at the TUMOS-project (sorry it is written in dutch but the pictures show everything).
Oh and DDDAC is selling also PCB (without profit just for diy'ers)
for TUMOS see this link: http://dddac.de/op06.htm
succes,
and happy newyear and al the best for 2006
Smooth240 said:
www.Pacificsemi.com
www.richtechparts.com
Both in Vancouver, both sold me genuine Renesas parts.
www.digikey.ca is carrying the as well but usually has no stock and its more expensive.
nina said:
Here is Mark's
Class A Mosfet Amplifier Project. There have been a few of these built now. You could use the 2SJ162 instead of the resistor.
This Zenquito amp looks interesting. I already have some MOSFETs which might be suitable since in Rod Elliots P101 amp they are substitutable. The Exicon 10N16 and 10P16, which are T03 devices; I have 9 pairs which I got for 84p 
. Any ideas if they would work in this too? Also is there much chance of it working properly on stripboard (or at least low level on stripboard and power devices on copper clad board)? I think as a tweeter amp in an active 3 way, 10W class A then into AB to give 40-50W maximum, should be good
. Any ideas if they would work in this too? Also is there much chance of it working properly on stripboard (or at least low level on stripboard and power devices on copper clad board)? I think as a tweeter amp in an active 3 way, 10W class A then into AB to give 40-50W maximum, should be good - Status
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