Discussion in "General help Guidance and Discussion" started by    prajwalsnh    Oct 27, 2013.
Sun Oct 27 2013, 05:31 pm
#1
Hi everyone,

I want to do the AC Motor Speed Controller Project. I downloaded the Documents from download section. I have few doubts to be clarified.

Can we use MOC3021 in place of MOC3011? Because here in my place

MOC3011 is not available. Also any alternatives for BT138 and 2N3904

transistor?? I have not asked about it's availability in the local electronics shop yet. If its

not available then which else can i use? Instead of Motor Load i'm planning to use Lamp

load. I hope the load doesn't matter whether its Motor or Lamp. In schematic

the diode to be used for rectifier section is not mentioned. Can i use 1N4148 or

1N4007?? Also the R & C value to be connected across BT138 is not mentioned in

schematic. Please need help regarding the above questions


[ Edited Sun Oct 27 2013, 05:51 pm ]
Tue Oct 29 2013, 12:53 pm
#2
Just compare characteristics of components you're trying to replace. Make sure they all match. I believe moc should be ok to replace but confirm. Diode should also be fine to replace. Regarding rc circuit I will ask experimenterUk to help.
Tue Oct 29 2013, 01:10 pm
#3
@Ajay Bhargav

OK sir. But comparison of what in particular among the two IC's?
Tue Oct 29 2013, 01:48 pm
#4
Basically electrical characteristics of IC. Like input voltage, maximum ratings etc.
Tue Oct 29 2013, 04:53 pm
#5
@Ajay Bhargav

Sir i checked the datasheet of both the IC's They are similar to each other. Their Electrical characteristics are also same.
Wed Oct 30 2013, 09:19 am
#6
Than you can use them in place of original IC without any problem.
Wed Oct 30 2013, 11:26 am
#7
@Ajay Bhargav

K sir. But i think BT138 is not available in my place Please can you suggest some alternative for that? Or some site where i can buy it??
Wed Oct 30 2013, 08:37 pm
#8


But i think BT138 is not available in my place Please can you suggest some alternative for that? Or some site where i can buy it??

prajwalsnh


The BT138 is just a general purpose triac.
You can use any triac with a voltage rating of 400 volts or above and a high enough
current rating for the lamp you are using.
Lamps can draw high currents when cold, so choose a triac rated at about 3 times the
running current of the lamp.

This is an example of a snubber network you can use.
(from ankitbajaj01's "Current Sensing of AC motor " thread)
For a small lamp you probably don't need a snubber network at all.



[ Edited Wed Oct 30 2013, 08:41 pm ]
Wed Oct 30 2013, 10:04 pm
#9
@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.
Wed Oct 30 2013, 10:07 pm
#10


@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



It will handle a 60W lamp easliy...

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