[Amps] B- questions

[Carl]

A reverse connected 1N4007 or any similar rectifier diode can be considered 
a zener also and they are used that way in amplifiers to set the operating 
bias. An off the shelf zener conducts at a much higher voltage for their 
lowest values. Ive used Schottky's in a meter protection experiment but 
didnt see any added benefit over a 1N400x. Both always protected the meters 
tested.

Carl
KM1H



----- Original Message ----- 
From: "Jim Carr" <n7fcf at hctc.com>
To: "Carl" <km1h at jeremy.mv.com>; <dezrat1242 at yahoo.com>; 
<amps at contesting.com>
Sent: Monday, November 09, 2009 6:47 PM
Subject: Re: [Amps] B- questions


> Carl,
> Another one how about reverse parallel zeners? RCA used a system of 
> reverse parallel zeners accros the 105v 120 cycle signal from the 
> diferential anplifiers to the printed circuit motors of their computor 
> tape drives to saw off the noise spikes rideing on the waveform.
> Jin
> N7FCF
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: <dezrat1242 at yahoo.com>; <amps at contesting.com>
> Sent: Monday, November 09, 2009 7:34 AM
> Subject: Re: [Amps] B- questions
>
>
>> The term I learned in industry is reverse parallel. Anti parallel seems 
>> to
>> be a ham invention and likely European in origin in line with anti 
>> clockwise
>> (-;
>>
>> Carl
>> KM1H
>>
>>
>>
>> ----- Original Message ----- 
>> From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
>> To: <amps at contesting.com>
>> Sent: Monday, November 09, 2009 3:51 AM
>> Subject: Re: [Amps] B- questions
>>
>>
>>> ORIGINAL MESSAGE:
>>>
>>> On Sun, 08 Nov 2009 22:35:36 -0500, Roger <sub1 at rogerhalstead.com> 
>>> wrote:
>>>
>>>> (I really dislike the term anti parallel...which logically
>>>>means series, but is used to mean "parallel diodes of opposing polarity"
>>>>and requires a expanded definition)
>>>
>>> REPLY:
>>>
>>> I don't like the term "anti-parallel"  either, but it is an ancient term
>>> going
>>> way back, and it is quite clear once defined. I'm open to suggestions 
>>> for
>>> something better.
>>>
>>> To me, the logical opposite of parallel is non-parallel, but to each his
>>> own.
>>>
>>> 73, Bill W6WRT
>>> _______________________________________________
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>>
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>
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