Re: Need Triac

From: Bill Jeffrey (wjeffrey_at_TAKE-THIS-OUTalum.mit.edu)
Date: 06/17/04 

Date: Thu, 17 Jun 2004 16:19:47 GMT

I'll try again here.

First, the link to American MicroSemi does indeed bring up ST2 as a
diac. It seems to be a small two-lead glass diode package, which
doesn't sound like what the OP is asking about, since he is talking
about riveting it down.

The ST2 data *** on the same site
http://www.americanmicrosemi.com/information/spec/?ss_pn=ST2
calls the ST2 a general purpose silicon rectifier diode, 160 amps at 400
volts. This doesn't sound like like what the OP is asking about, either.

The Mouser catalog search on ST2 also leads to diacs, but the ST2 is
again a small two-lead glass diode.

A further Google search leads to
http://www.kelvin.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=K&Product_Code=620135
where the ST2 is a triac, with three leads and a tab to rivet it down.

My conclusion is that there is more than one part out there with the
nomenclature ST2. Be careful what you order.

Bill Jeffrey
====================
.
> handyman@c---------.com wrote:
>
>> I have a Black and Decker reciprocating saw. It's a variable speed
>> type, and has a Triac. It quit working, and when I opened it, I found
>> one of the terminals broken off the triac (right at the body, so I can
>> not solder it). Otherwise the saw works fine.
>>
>> Two questions
>>
>> 1. Can I wire the motor directly to the line (120VAC), thru the switch
>> of course. I need to use the saw and dont care about variable speed
>> for the moment, I need full speed?
>>
>> 2. Does anyone know where I can buy a GE ST2 triac? B&D parts wants
>> to sell me the whole switch assembly for more than what I am willing
>> to pay for this old saw. I dont need the switch, all I need is the
>> triac and a pop rivet to mount it. I know most places these days have
>> a minimum order amount. I just need this one part.
>>
>> To reply by email, handyman AT centralpets DOT com
>>
>
> GO to:
> http://www.americanmicrosemi.com/products/newitem/index.php?t_id=31
>
> They call this item a Diac. It is used to trigger a Triac, not
> replace one!! If you bypass this device I would expect more damage to
> your saw.
>

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