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 Post subject: Re: PCB orders
PostPosted: Fri Dec 05, 2008 1:38 am 
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Joined: Tue Dec 14, 2004 12:26 pm
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Location: Lisbon, Portugal
Does Philips sound weird in there?
They had to go Magnavox and Signetics...
How unfortunate to be associated with lamps, a company that makes so much stuff...

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 Post subject: Re: PCB orders
PostPosted: Wed Jan 14, 2009 12:48 am 
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Joined: Mon Dec 13, 2004 3:29 pm
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Location: The Labour Exchange....be seeing you!
Someone needed a few of these really, really bad, so I made a small (very small!) run.

I have contacted 2 guys that I think might want some. There may or may not be any available for others. Keep an eye here to know.

Anyway, there have been some small changes:

Output transistor can be TO-220.
Pads for a 1206 SM resistor in series w/the base/gate.

"Gate? I thought this was BJT."

Yes, but I tested it with a MOSFET.

"Why?"

Uh............say someone wants to power a chip that takes a lot of current. A MOSFET is easier to drive, and the extra 2-3 V should give the error amp more stand-off from the rail.

"But aren't MOSFETs noisy?"

Yeah, but if you are powering a filter chip, I don't think the extra bit of noise will hurt. Considering how much noise will be on the supply rail anyway.

So, I made provisions for a small (10R-100R) resistor for the gate. You can use a base resistor, or short across it. Your choice.

Oh..........I made some measurements the other day. I stuck 180 uF on the output, w/o any noticeable noise peaking or ringing.

Jocko

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