[Amps] B- questions

[Hardy Landskov]

The 1N4007 is actually manufactured as a PIN diode. It is the only one in 
the 1N400X series that is and I don't know why. I worked at another division 
for 26 years before I retired.
73 Hardy N7RT

----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Jim Carr" <n7fcf at hctc.com>; <dezrat1242 at yahoo.com>; 
<amps at contesting.com>
Sent: Monday, November 09, 2009 6:41 PM
Subject: Re: [Amps] B- questions


>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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