[Amps] CB Amps or full spectrum???

[jeremy-ca]

I find it strange that you condemn a circuit without even knowing its 
details.

Carl
KM1H


----- Original Message ----- 
From: "Tom Rauch" <w8ji at contesting.com>
To: <amps at contesting.com>
Sent: Wednesday, October 10, 2007 2:03 PM
Subject: Re: [Amps] CB Amps or full spectrum???


>> BTW, a 1N5408 on top of an output transistor makes a fair
>> temperature
>> regulator. Not perfect but its cheap and simple as a
>> retrofit of an existing
>> brick.
>
> Measure the voltage regulation of that method when you drive
> the amp with rated drive power and most people's opinion
> will change. It's a crummy system at more than a few watts.
>
> As the base is driven with RF it tries to move negative. In
> order for the bias to remain anywhere near to stable the
> current through the diode has to be at least ten times the
> peak base current. You'll fry that little 1N5408 trying to
> get that much current in any amp that runs more than a few
> mA of base current.
>
> 73 Tom
>
>
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