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

The link you posted is not good--maybe try again?
Thanks for input.
Hugh
Main TV

Ty Kraemer wrote:

>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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>
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>

-- 
Hugh Thornley
Main TV
636 Main St.
Longmont, Colorado 80501
303-776-6955
maintv2002@xxxxxxxxxxxxx




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