First One - mosFET amplifier module

[Baloothebear4]

Hey put me down for 2x FO -Ms when will they come in? Thanks


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[Inproof]

Someone stole Andrej.... No where to be found...

Maybe someone has an M 1.4 module for sale ?

 

[Lazy Cat]

Hey put me down for 2x FO -Ms when will they come in? Thanks

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Someone stole Andrej.... No where to be found...

Maybe someone has an M 1.4 module for sale ?

FO M in production, will be announced here when available.

FO L only 20 modules left on stock, hurry if like to make best power amp.

Four new FO L ready to travel the world.

Regards, L.C.

 

[Erlend Sæterdal]

FO L

Number 9 and 10 Modules on it;s way for me.

 

[poseidonsvoice]

And F.O. S ?

Best,
Anand.

 

[Lazy Cat]

Number 9 and 10 Modules on it;s way for me.

Nope, nr. 29 & 30

 

[Lazy Cat]

And F.O. S ?

Best,
Anand.

FO S is based around ALF08NP16V5 mosfet which is happen to be unobtainable, any suggestions?

 

[poseidonsvoice]

FO S is based around ALF08NP16V5 mosfet which is happen to be unobtainable, any suggestions?

Only suggestion then is the F.O. M but at a lower PS rail. What is your advice?

I certainly don't need/want 160w RMS/ch.

Best,
Anand.

 

[Erlend Sæterdal]

Nope, nr. 29 & 30

You now I have built 6 x M modules and will finnish 2 x L modules mono in few days.

 

[maxidcx]

FO S is based around ALF08NP16V5 mosfet which is happen to be unobtainable, any suggestions?

yes, do same as FO M but with 8amp devices and 100ma bias, as this is the major concern to multiamping I d say. cost wise this is few euro less only but ok you can make a lower price for such S version...
just remember one could find a pair of LJ L7 mosfet for 40 euro so if we go FO there is a reason.

 

[Erlend Sæterdal]

yes, do same as FO M but with 8amp devices and 100ma bias, as this is the major concern to multiamping I d say. cost wise this is few euro less only but ok you can make a lower price for such S version...
just remember one could find a pair of LJ L7 mosfet for 40 euro so if we go FO there is a reason.

L7 is dangerous and with Fake components.

 

[Erlend Sæterdal]

Preadjusted DC?

Looks like the L modul are Preadjusted. With 55 Vdc on power supply there is almost no Dc.

 

[Mark Verhoeven]

They should be all preadjusted!

 

[Erlend Sæterdal]

Think I killed the Large modul at once by adjustment. A spark at TP 3 and now there is 9.84 vdc between TP3 and TP4

 

[Erlend Sæterdal]

Think I killed the Large modul at once by adjustment. A spark at TP 3 and now there is 9.84 vdc between TP3 and TP4

Between TP3 and 4 no measureable connection. Between 1 og 2 10 ohm.

 

[Lazy Cat]

Think I killed the Large modul at once by adjustment. A spark at TP 3 and now there is 9.84 vdc between TP3 and TP4

Spark? Where did it came from? FO L worked perfectly on my test bench.
TP1-TP2 also TP3-TP4 resistance should be 10 Ohm.

 

[Erlend Sæterdal]

Spark? Where did it came from? FO L worked perfectly on my test bench.
TP1-TP2 also TP3-TP4 resistance should be 10 Ohm.

Well it was running for 20 hours before I started adjustment. There was 45 mv at TP 3- 4. Can not see any 10 ohm resistor. Anything I can do?

 

[Lazy Cat]

Well it was running for 20 hours before I started adjustment. There was 45 mv at TP 3- 4. Can not see any 10 ohm resistor. Anything I can do?

Nothing really much you can do now, there's full bunch of SMD parts on bottom of PCB. TP1-TP2 mV adjustment should be trivial, can not imagine how a spark came into equation. Was multimeter set to A instead mV?

I consider myself experienced in this regard but I always approach to setup adjustments with max caution.

Did you like the sound in that 20 hours session or it was just powered without the signal?

 

[Erlend Sæterdal]

Measuring Voltage TP 3 - TP 4 the leads from multimeter is right at the base of T 16. I do not like that situation. Would be Nice with a resistor in between.

 

[Erlend Sæterdal]

Measuring Voltage TP 3 - TP 4 the leads from multimeter is right at the base of T 16. I do not like that situation. Would be Nice with a resistor in between.

Collector?