On Mon, 19 Mar 2007 12:23:07 -0500, Bob Simon
wrote:

My wife's reading lamp failed. I replaced the 100W 120V halogen bulb,
which did no good so I pulled out the dimmer circuit. I know nothing
about these but after googling for light dimmer I found this:
http://www.epanorama.net/documents/l...mmer.html#120v

The "typical 120V AC dimmer circuit" uses almost the same components
that are on my dimmer:
two diodes
cap
resistor
pot
diac
triac

The diodes test good one way so I wonder if either the BT137F triac or
the DB3 diac are the problem. Can these be tested with a VOM?

I went to the local parts store and they did not have either the triac
or the diac. They did have a TNE5646 "Triac with Internal Trrigger
Diac", which I purchased. This is also a 600V device and it handles
10A.

Can I simply install this in place of the BT137F and jumper between
the two holes on the circuit board for the missing diac?