The simplistic Salas low voltage shunt regulator - Page 435 - diyAudio
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Old 4th October 2011, 09:20 PM   #4341
Salas is offline Salas  Greece
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What's NMOS?
It's what your avatar is.
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Old 4th October 2011, 10:18 PM   #4342
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Quote:
Originally Posted by merlin el mago View Post
What's NMOS?
There are two types of Mosfets:
Tipo nMOS: Substrato de tipo p e difusões de tipo n.
Tipo pMOS: Substrato de tipo n e difusões de tipo p.
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Old 5th October 2011, 11:50 AM   #4343
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Originally Posted by Salas View Post
It's what your avatar is.
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Originally Posted by RCruz View Post
There are two types of Mosfets:
Tipo nMOS: Substrato de tipo p e difusões de tipo n.
Tipo pMOS: Substrato de tipo n e difusões de tipo p.
Thanks guys
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Old 5th October 2011, 12:26 PM   #4344
RCruz is offline RCruz  Switzerland
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I bought some cheap IRF640 from a locar distributor.

I can not identify the OEM

It reads IRF640 Y03K AB

Is it possible these are fakes ?
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Old 5th October 2011, 12:35 PM   #4345
Salas is offline Salas  Greece
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They are widely made. Any photo?
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Old 5th October 2011, 10:08 PM   #4346
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For the REFLEKTOR, could we made a MJE variant for 3.3v Vout as for the SSLV by simply replacing the mosfet shunt ?
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Old 5th October 2011, 11:01 PM   #4347
Salas is offline Salas  Greece
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The output impedance would be very uninspiring in that case.
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Old 6th October 2011, 12:41 AM   #4348
RCruz is offline RCruz  Switzerland
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Just finished the Reflektor and it fired ok. Looks promising. very stable on the bench with a 1kr load.

Very easy to set voltage out.

Strangely, I set it to 10.00Vout and it is loosing voltage with time... 10.00 ~9.99 ~9.98.... As it heats up.

I will let it running for a while now.

My choice of 3r3 // 10r for R1 was spot on.... It is running at 250mA.
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Old 6th October 2011, 12:43 AM   #4349
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It seems the IRF640 are ok after all... I got them from a local distributor (Robert Mouser). This guy is German so I guess he only sells good stuff.
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Old 6th October 2011, 12:48 AM   #4350
Salas is offline Salas  Greece
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As it heats up some things change a little, like Vgs, Vbe(s), let it come up and then fix it with the trimmer.
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