Moskido - Hybrid Aikido/MOSFET amplifier

[beau2317]

btw there are atually two almost identical threads. Long story. But the longer thread is

Moskido - Hybrid Aikido/MOSFET amplifier

You might want to check it out.

I got the MOSFETs from RS Components. But you can get them on ebay

[planet10]

Originally posted by beau2317
btw there are atually two almost identical threads. Long story.

I got the MOSFETs from RS Components. But you can get them on ebay

Yes, i just figured that out, and have merged the 2 threads. beau2317 you are not supposed to start 2 threads with the same title & same post or you end up with confusion as we just had here- i deleted the post with which you started the 2nd thread .

There may be some posts that are no longer relevant... mail me with the post numbers 7 i'll clean it up

dave

[marsupialx]

There is a guy in England that is selling 4 Buz900 for 10pounds.
With shipping it came out to $30 for 4. - Jeffrey Hill (marsupialx)
Ebay item number: 170121491649
http://cgi.ebay.com/4-x-Magnatec-BUZ...QQcmdZViewItem

[hallthom]

Hi all,

has anyone a good shematic for a power supply, from the mosfet- section for JBs aikido hybrid amp ?
thanks a lot !


best regards

Thomas

[tubee]

Originally posted by hallthom
has anyone a good shematic for a power supply, from the mosfet- section for JBs aikido hybrid amp ?
thanks a lot !

I guess simple PS with big toroid, Hexfred rectifier and Panasonic or BC components caps. And not to forget a zobel, aka snubber.
I will replace the standard 15A bridge with hexfreds and add snubber on my hybrid's current PS.

[beau2317]

That's pretty much what I did. The circuit I used is on page 3 of this thread. I forgot to put in 0.1uF caps across each diode on the bridge.

That seems to work OK. The amp is very quiet (apart from when music is being played

[tubee]

Originally posted by beau2317
forgot to put in 0.1uF caps across each diode on the bridge.

And leave it that way, no caps across diodes. I tried that with the standard 15A rectifier, and removed it after a 1/2 hour listening.
The added diodes will create a hf-pass from toroid to DC PS, not the best imo. Better is to filter HF away on the +/-DC voltages with (the before mentioned better) lytics and maybe some small film caps extra.

[tubee]

http://www.diyaudio.com/forums/attac...amp=1180584014

I wonder if the rather high resistor value's from the C-R-C filter doesn't raise the PS impedance too much.
I only used two 0.1 or 0.2 ohm resistors in AC line before bridge to dampen diode noise. But will add 0.12 in DC line when i fit the hexfreds/snubber.

The lytic i used are only 10000uF Panasonics, cheap and good. I don't like very high lytic cap value's: Have rebuild a EL84 SE tube amp with bigger caps. It never sounded as it did with 25uF/channel! This was a tube amp though, and for high currents in solid state the greater values are needed.

The common mode RF filter on filament ps is interesting!

[beau2317]

I figure that the PS impedance is dominated by the last caps. Down side is it's wasteful, but class A amps are wasteful anyway.

Advantage of larger R is that the filtering is more effective..swings and roundabouts I guess.

The common mode RF filter on filament ps is interesting!

That seemed to help. Also my friend put on on his version and was also surprised at the improvement.

[ece]

Any chance of posting a complete list of components with power ratings?

regards

Paul