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-   -   HAL SYMFET (http://www.diyaudio.com/forums/solid-state/202948-hal-symfet.html)

OnAudio 21st December 2011 06:13 PM

HAL SYMFET
 
2 Attachment(s)
Hi RSK,

Here it is. Let members comment for a while then you can build.

kind regards,

Harrison.

OnAudio 22nd December 2011 03:07 PM

Quote:

Originally Posted by OnAudio (Post 2829576)

Here it is.

The statement in the schematic that reads "Replace R37 and R38 with a 2k precision trimmer" should read "Replace R37 and R38 with a 1k precision trimmer".

OnAudio 22nd December 2011 04:50 PM

2 Attachment(s)
a few more graphs inorder

dadod 22nd December 2011 09:08 PM

Quote:

Originally Posted by OnAudio (Post 2830710)
a few more graphs inorder

Strange way to do square wave test, only positive swing???

OnAudio 23rd December 2011 01:57 AM

Quote:

Originally Posted by dadod (Post 2830988)
Strange way to do square wave test, only positive swing???

Hi Dadod,

Not so strange :rofl:

kind regards,

Harrison.

OnAudio 23rd December 2011 01:59 AM

gate protection diodes
 
I wonder how much heat the gate protection diodes on these output devices can take ?

Nico Ras 23rd December 2011 04:08 AM

Quote:

Originally Posted by dadod (Post 2830988)
Strange way to do square wave test, only positive swing???

Is it not? I mentioned it in his previous design.

Nico Ras 23rd December 2011 04:19 AM

Quote:

Originally Posted by OnAudio (Post 2831249)
I wonder how much heat the gate protection diodes on these output devices can take ?

Why? the device is rated at 150 degrees centigrade, it would be silly if they rated the diodes at any less.

Nico Ras 23rd December 2011 04:27 AM

Why use a Vbe multiplier with Lateral Mosfets, that whole arrangement including precision pots can be replaced by a single resistor.

What are the purpose of D9 & D10, the double diode Vdrop will remain the same regardless of the additional noise introduced by the zener.

dadod 23rd December 2011 06:35 AM

Quote:

Originally Posted by OnAudio (Post 2831247)
Hi Dadod,

Not so strange :rofl:

kind regards,

Harrison.

OK show us +- swing, or you don't know how to do that?
Use of the bias spreader with laterals is recommended because when trimer loses conntact there is no danger of possible distraction of laterals. Trimer should be connected between base and emitter and bias transistor should not be thermaly bonded with laterals.
dado


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