Re: Need Triac

handyman_at_c---------.com
Date: 06/18/04 

Date: Fri, 18 Jun 2004 13:26:52 -0500

On Thu, 17 Jun 2004 16:19:47 GMT, Bill Jeffrey
<wjeffrey@TAKE-THIS-OUTalum.mit.edu> wrote:

>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.
>>

Thanks for all help....

OOPS, Sorry, I read the schematic wrong. You are correct, the ST2 is
a diac. They had it labelled right next to the triac, and the triac
was not given a part number. However, after scraping off the silicone
or whatever it is, from the triac, the part number on the triac is a
G.E. SC146D.
I contacted Black & Decker, and this part is not available, since they
said the saw is obsolete. However, they said they could sell me a
universal speed controlled switch, which would fit the saw, but would
cost nearly as much as a new saw.

This saw worked perfectly, it's just that one of the pins broke off
the triac, right at the case, so there is no way to solder it. (I may
have broken it when I opened the case to lubricate the gears, since
the silicone was pulled loose too).

Anyone have any specs / replacement part suggestions for this triac,
and know where I can buy one without having to order $50 (or more)
worth of stuff. I wonder if Radio Shack might have a replacement,
then I can buy it directly and eliminate all the mail order hassles.

THANK YOU

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