Unknown symbol on board
Unknown symbol on board
(OP)
Working on fixing a small 120v dimmer, and it has a fairly simple circuit, but there's a component I've never seen before.
I think it's some form of diode, but the symbol is like 2 diodes facing each other, IE ->|<- and the part is labeled "DB3"
I need to know how i'd check this component for function. The circuit is just a cap, the DB3, potentiometer, "j1" (transistor?) which I also don't know if i can check, and because of the arrangement of the board, I can't read the numbers on.
Suggestions?
I think it's some form of diode, but the symbol is like 2 diodes facing each other, IE ->|<- and the part is labeled "DB3"
I need to know how i'd check this component for function. The circuit is just a cap, the DB3, potentiometer, "j1" (transistor?) which I also don't know if i can check, and because of the arrangement of the board, I can't read the numbers on.
Suggestions?
Byron Morgan - Tupelo, Mississippi
1947 Mayline
SolidWorks 2012





RE: Unknown symbol on board
Why?
RE: Unknown symbol on board
The diac symbol looks close (on wikipedia) although the sidac looks closer, except the triangles are both closed. I googled DB3 and it seems to be a "bidirectional trigger diode"...
working on drawing the thing. I'm not an EE obviously, so I'm slow.
Byron Morgan - Tupelo, Mississippi
1947 Mayline
SolidWorks 2012
RE: Unknown symbol on board
The many examples will help you to sort through the one you're dealing with. They're all mostly the same.
RE: Unknown symbol on board
PS: ...and then click on Google Images.
It's a gold mine.
RE: Unknown symbol on board
The DB3 is from ST Microelectronics.
Cheers,
Benta
RE: Unknown symbol on board
Attached is the layout of what I have here. The potentiometer I'm not sure how to represent correctly. there are 2 terminals on bottom and 3 from the edge. The edge center and "high" side are used along with the 2 bottom. Sorry for the roughness of it. Wondering if I would be just as well to build one of these with the diac/triac on perfboard.
dimmer is mine
http:
lamp dimmer is one i might be able to build?
h
Byron Morgan - Tupelo, Mississippi
1947 Mayline
SolidWorks 2012
RE: Unknown symbol on board
Probably not easy if it's the potentiometer.
RE: Unknown symbol on board
Gonna guess that the DB3 Diac isn't polarized, right?
Byron Morgan - Tupelo, Mississippi
1947 Mayline
SolidWorks 2012
RE: Unknown symbol on board
Triac bt134 600e
Diac db3 c502
The capacitor only has 333J and 400V on it, it's a dark orange part. What value would that be? 333uF?
Byron Morgan - Tupelo, Mississippi
1947 Mayline
SolidWorks 2012
RE: Unknown symbol on board
333uF @ 400v would be a physically very large capacitor. It's probably 33 x 10^3 pF = 33nf = 0.033uF (many orders of magnitude smaller than your guess).
RE: Unknown symbol on board
Thanks for all the help, and hopefully will have good news in a day or two (or next year)
Byron Morgan - Tupelo, Mississippi
1947 Mayline
SolidWorks 2012