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| | |-+  Has anyone built their own Kleinulator kit		 « previous next »
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Author Topic: Has anyone built their own Kleinulator kit  (Read 3701 times)
hywelg
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« on: November 29, 2008, 09:39:48 PM »
I'm doing that at the moment, building it into a rack chassis. According to Nik I need to adjust the trimmer to bias the FET. How do you do that? Simple instructions appreciated Embarrassed

He gave figures of 20-22Vdc though I think he must mean mV surely?

TIA

Hywel Harris
« Last Edit: November 29, 2008, 09:43:28 PM by hywelg » Logged
erwin_ve
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« Reply #1 on: November 29, 2008, 11:37:33 PM »
You should bias the Fet with half the voltage of the power supply.
Edit: I build an old "public domain" model. I think the commercial design is different.
« Last Edit: November 29, 2008, 11:46:09 PM by erwin_ve » Logged
hywelg
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« Reply #2 on: November 30, 2008, 12:07:44 AM »
How do I measure the bias voltage? All I know is that the FET has 3 pins and a flat on the body. Do I measure pin to ground or pin to pin? I know sod all about the electronics of these things I'm afraid so I'd be very grateful if you could be very specific.

Thanks

Hywel Harris
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erwin_ve
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« Reply #3 on: November 30, 2008, 02:09:35 PM »
The bias voltage is measured from drain to ground. So you measure between,  from the trimpot lug going to the fet, and ground. Hope this helps.
Mind; I build the public domain version; I don't know how the commercial is build. Maybe a different approach to both FET.

Quote from: hywelg on November 30, 2008, 12:07:44 AM
How do I measure the bias voltage? All I know is that the FET has 3 pins and a flat on the body. Do I measure pin to ground or pin to pin? I know sod all about the electronics of these things I'm afraid so I'd be very grateful if you could be very specific.

Thanks

Hywel Harris
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