Discussion in "General help Guidance and Discussion" started by    prajwalsnh    Oct 27, 2013.
Thu Oct 31 2013, 07:55 pm
#11


@ExperimenterUK

Thanks for your reply sir. The BT138 has ON-state RMS current of 12 A. Coming to lamp, what wattage lamp should i use? I'm planning to use a normal 60W lamp used in homes.

prajwalsnh


12 Amps is the maximum it can handle, not a requirement.
You might have a 2 gallon/10Litre bucket but you don't have to fill it.

For 60Watts any triac that can handle more than one amp is okay.
Thu Oct 31 2013, 10:48 pm
#12
@ExperimenterUK

Thank you sir.Then I will buy the components soon and update you.
Fri Nov 01 2013, 03:33 am
#13


@ExperimenterUK
Thank you sir.Then I will buy the components soon and update you.

prajwalsnh


The triac must rated for at least 400volts of course
Wed Nov 13 2013, 07:57 pm
#14
@ExperimenterUK

Sir i got BT136 instead of BT138. I have not rigged up the circuit yet. Can i use BT136? The repetative off state voltage of BT136 is 600V. Also in power supply circuit can i use 12-0-12 transformer instead of 9-0-9?
Sat Nov 16 2013, 12:31 am
#15


Sir i got BT136 instead of BT138. I have not rigged up the circuit yet. Can i use BT136? The repetative off state voltage of BT136 is 600V.
Also in power supply circuit can i use 12-0-12 transformer instead of 9-0-9?

prajwalsnh


A BT136 is rated at 4 amps which is fine for a 60 watt bulb.
It should be okay for say 150 watts.


Also in power supply circuit can i use 12-0-12 transformer instead of 9-0-9?

prajwalsnh



The diagram shows 0-9 volts not 9-0-9.
If you use a 12-0-12 connect between 0 and one of the 12 volt connections.
Check with a meter that you get about 12 volts, it will probably be more like 14 volts ac.

Use capacitors rated at at least 50 volts in the input to the regulator.
(to the left of the LM7805)
Increase the capacitors to the to the right of the LM7805 from one uF to 100uF,
with at least a 10volt rating.
Check the temperature of the LM7805 when running, if it gets hot
add a small heatsink.

There is mains voltage in this project.
Be very careful with the wiring !!!
Check with a meter for that there is not 240 volts ac between the low voltage side
and earth. (that's mains earth )
This would mean a wiring fault.
Add a connection from the circuit 0 volts to mains earth.





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