[TechAssist] ***** Zener or Avalance diode? *****

Gentlemen,
Surprise!
In short form:
Below  6 volts the Zener affect is in force.
At 6 volts both are in affect.
Above this voltage, only the Avalanche affect comes to play.
If you want to understand the Zener/Avalanche principal, fallow this lead:
http://www.deas.harvard.edu/courses/es154/lectures/lecture_2/breakdown/break
down.html
The address is all one line.

Ty

Tiberius (Ty) Kraemer
Blue Star Electronics
3312 Silverton Rd.NE
Salem, OR 97303-2753
Phone: 503 391 1491
E-Mail: ty1k(at)attbi.com


----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, August 29, 2002 7:28 AM
Subject: [TechAssist] Re: Sony KV32S25--Zener or Avalance diode?



Bob,

Thanks for that information.  I will file that away for my next Fulton
order.

Still, it doesn't answer the basic questions--"What is the difference
between a zener and an avalanche diode?" and "Will an NTE570 sub for
D648?"

My understanding is that an avalanche and a zener are the same animal.
The NTE web site provided little help for either question.

Since D648 is used as a crowbar (protection) only,  the diode is
essentially out of the circuit UNLESS the regulator ckt fails.  For that
reason, I always replace IC643 (DM-58, 8-749-012-13) whenever I find D648
shorted.

I used an NTE570 to replace D648 a while back when I found I was out of
the original and no time for an order.  Time will tell.


Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL  32563
850-934-8324 (Voice) 850-932-0819 (Fax)


On Thu, 29 Aug 2002 07:34:38 -0400 "Gemini Computer & TV"
<geminitv@xxxxxxxxxxxxxxxx> writes:
>
> I am working on the exact same model right now. D648 is a 150 volt
> zener,
> (generic# EZ0150AV1), Sony part # 8-719-057-52.
>
> Bob Waterman, CET #RI-28
> Master Technician License #9109
> Service Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
>
> ----- Original Message -----
> From: "Hugh at Main TV" <maintv2002@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, August 28, 2002 7:37 PM
> Subject: [TechAssist] Sony KV32S25--Zener or Avalance diode?
>
>
> >
> > Power surge hit set--replaced 2SC4834s, all small diodes in
> Swmode, C609
> > & C610 caps,
> > R607 0.1 ohm,  all 22 ohm res. in power, then found D648 shorted.
> No
> > sub as per Sams or NTE,
> > symbol on Sams looks like zener--- part # is EZ0150AV1---- I put
> in an
> > NTE570 Avalance diode--set seems to work ok... Question I have is
> what
> > is difference between a 150 zener and 150 v avalance diode?
> Would they
> > both work as protection on 135v power line?
> > Hugh
> >
> > --
> > Hugh Thornley
> > Main TV
> > 636 Main St.
> > Longmont, Colorado 80501
> > 303-776-6955
> > maintv2002@xxxxxxxxxxxxx
> >
> >
> >
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