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| To: | <[email protected]> |
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| Subject: | Re: LF: TA condx last night |
| From: | "Alan Melia" <[email protected]> |
| Date: | Fri, 13 Jan 2012 13:08:38 -0000 |
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| References: | <CABP+t7a4HJpEJhtih2HLchjFeXaM_HX0THRdVaL4tFCytzbuRw@mail.gmail.com> <[email protected]> <[email protected]> |
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Hi Joe you need to be careful with the 4427 as well. If you remove the drive from some of this family the output all go permanently high. So the "two Dave's" keyed their designs by keying the supply to the 4427. Alan ----- Original Message ----- From: <[email protected]> To: <[email protected]> Sent: Friday, January 13, 2012 12:27 PM Subject: Re: LF: TA condx last night On Fri, 13 Jan 2012, Stefan Schäfer wrote: > There are a few possible reasons why the PA blows up. I am more and more > convinced that it comes from the drive stage. Late in the night i got the I've been thinking along these lines too. I fried an IRF640, replaced it with an IRFP260, and was heartbroken when that fried too. I put another 260 in and half-fried that one -- it still puts out a bit of RF, but the input is a triangle and not a square so the gate impedance is way down. The TX is a class E driven with a juction transistor totem pole. The plan is to replace this with a fet driver eg: 4427. 73 Joe VO1NA This electronic communication is governed by the terms and conditions at http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2011.php |
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