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Old 3rd June 2003, 10:14 PM   #1
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Default Le Monstre Fet connection!

Hi Monstre DIYers,

I want to build two Le Monstre Monoblock's but don't know how to connect the Fet's at the input.
Are the drains connected to the 100 ohm pot or the source?
Or the source from the upper and the Drain of the lower fet or the other way around?

Thanks in advance!

Audiofanatic

P.S. look at the arrows and the dots!
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Old 3rd June 2003, 10:42 PM   #2
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Hi,

People like Ralph and Jam might be able to help you out....

I'll need to browse my books if they fail to respond.
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Old 3rd June 2003, 10:56 PM   #3
rickpt is offline rickpt  Portugal
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Hi

You can reverse the source and the drain without any problem; just make sure the gate is in the right place

http://www.rason.org/Projects/jfetamp/jfetamp.htm

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Old 3rd June 2003, 11:28 PM   #4
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Default J-fets

2SK170 Fet's drain connect to 1K at + power supply, 2SJ drain to 1K at - power supply.

2sk170 - n channel j-fet. In "normal" mode ( called saturation ) drain is positive respect to gate, and gate is negative respect to source.

Or, drain is positive respect to gate, source is positive respect to gate but less than drain is. Result drain is positive respect to source.


2sj74 p-channel drain is negative vs gate, source is negative vs gate, drain is negative vs source.
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Old 4th June 2003, 01:46 AM   #5
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Default Re: Le Monstre Fet connection!

Quote:
Originally posted by Audiofanatic

Are the drains connected to the 100 ohm pot or the source?

The sources must be connect to the 100 Ohms pot!!!

Cheers
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Old 4th June 2003, 02:11 AM   #6
jam is offline jam  United States
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The sources are connected to the 100ohm pot, like the Tube Dude says, be shure the color or rank of both fets are the same. Check for correct bias on the output stage.

Good luck!

Regards,
Jam
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Old 4th June 2003, 02:14 AM   #7
jam is offline jam  United States
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Talking Long live Silicon!

Frank,

I see that you have been trolling the solid state forums again.....

Regards,
Jam
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Old 4th June 2003, 02:21 AM   #8
jam is offline jam  United States
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Forgot the pic....
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Old 4th June 2003, 09:08 AM   #9
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Hi DIYers,

Thank you very much for your help.
I didn't expect so much reaction on this thread.
I'm realy thankfull to you all! I'll report a.s.a.p. to you guys when my two Le Monstre's are ready.

To Frank, ik vind het heel attent van je dat je bereid bent/was mij hiermee te helpen. Dankje wel!

Frendly greetings,

Audiofanatic

P.S. If I succeed in making new PCB's I'll post it eventually on this thread.
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Old 4th June 2003, 03:42 PM   #10
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Default Re: Long live Silicon!

Hi,

Hi Jam,

Long live Silicon Valley?

Trolling? Qui? Moi?

You know that when I see something like Kaneda, Le Monstre or Hiraga I just have to subscribe to the thread...if only to prevent you guys from making mistakes.

Hi Audiofanatic,

Quote:
To Frank, ik vind het heel attent van je dat je bereid bent/was mij hiermee te helpen. Dankje wel!
Thank you, I actually didn't do anything...yet.
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