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@hctc.com>
To: "Carl" <km1h@jeremy.mv.com>; <dezrat1242@yahoo.com>;
<amps@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@jeremy.mv.com>
> To: <dezrat1242@yahoo.com>; <amps@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@yahoo.com>
>> To: <amps@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@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
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
> --------------------------------------------------------------------------------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.702 / Virus Database: 270.14.58/2493 - Release Date: 11/09/09
> 11:40:00
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|