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Higher current Switching triac

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gaspode42

Member
Hi

You forgot to attach the circuit, but try something like this.
 

gaspode42

Member
I may be incorrect but according to the data-sheet the BT136 will handle up to 4A, so a 100W bulb should work as is I think.
 

kurrodu

New Member
I connected one 60 watt bulb and one 40 watt in series which are dim when lit. Do you think I can use BT 136 replacing BT 139 in the circuit ?
 
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ericgibbs

Well-Known Member
Most Helpful Member
I connected one 60 watt bulb and one 40 watt in series which are dim when lit. Do you think I can use BT 139 replacing BT 169 in the circuit ?

hi,
The BT169 triac is only rated at 0.5Arms, whereas the BT139 is 4Arms.
 

mdorian

Member
Yes , you can , change R10 and R9 to 1..2 Kohm , at least 1W because BT139 need four times gate trigger current than BT136.
 

ericgibbs

Well-Known Member
Most Helpful Member
Sorry Ericgibbs, I meant replacing Bt 136 with Bt 139

The BT139 is a 16Arms triac.

What are you planning to control.?

The latching and holding currents for the BT139 are approx double that of the BT136.

EDIT:
If you use the BT139, you may have to reduce the 5.6K on the MOC3021 to approx 3.9K.
The MOC and BC547 will be OK.
 
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Jirka46

New Member
I connected one 60 watt bulb and one 40 watt in series which are dim when lit. Do you think I can use BT 136 replacing BT 139 in the circuit ?

Of course they are dim. If you want full power you have to connect them in parallel.
Jirka
 
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