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-   -   bobby the 60w mosfet (http://www.diyaudio.com/forums/solid-state/88011-bobby-60w-mosfet.html)

johndiy 10th October 2006 05:29 AM

bobby the 60w mosfet
 
2 Attachment(s)
bobby the 60w mosfet

edl 10th October 2006 08:38 AM

The miller cap is in the wrong place on the schema.

On the margin what is this thread about?!

lineup 10th October 2006 10:33 AM

looks like it can work
it is a basic concept for simple power amplifier
that has been used a very long time in many designs

See for example Elliott Sound Products
project 36
the wellknown DoZ simple amplifier
http://sound.westhost.com/projects-1.htm

Now,
you are far from a good amplifier just by a basic topology
- components has to chosen, like a Lateral MOSFET complementary pair
- components values has to be set in a good way
- finally, the practical circuit has to be built
- together with a power supply, that is suitable for this circuit

But a good start
and
when you have not made up your mind for any details
then not many details can be questioned
and not much to add a comment about
;)


Regards
lineup

latala 10th October 2006 10:35 PM

I did something like this about 20 years ago and was not impressed (Hitachie mosfets) . To me a waste of good devices !
This circuit or a very near design is also featured in a B,banie publication "see the maplin cat "To me the worry is that of driving the output devices capacitances with this driver stage config
Regards Trevor

johndiy 10th October 2006 10:42 PM

Hi thanks
glad you like it
the design can build a real good amplifier

cheers

john

latala 10th October 2006 10:53 PM

You need to have a larger than normal driver stage current in order to drive the out put devices your drawing is only that some values would assist greatly in aiding .
Going back to the driver stage I think you need about 25 mA in order to look after the gate capacitance
also I have not noted any gate protection for the output devices
this could be most imprtant
You will also require some gate stopper resistors on the output devices approx 220 ohm or your amplifier could oscillate and self destruct !!!

regards Trev

johndiy 10th October 2006 10:59 PM

thanks trev for your constructive suggestions
glad you like the circuit

Leolabs 11th October 2006 02:55 AM

Why still go for single supply???

johndiy 11th October 2006 02:59 AM

simplicity and offset issues etc

glad you like it, is good!

Wavebourn 11th October 2006 03:09 AM

Hello to your amp from 1977! :)

There was my famous Swinik, it could work great with FETs, but they were not available yet... :(

http://wavebourn.com/images/pyramid/swinik.gif


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