I have a question as shown in my title.
I am able to get radial choke coil inductors of 1mH,3mH and 5mH.
But, I couldn't get the datasheet of these inductors.

Is any expert here can help me to choose a suitable inductor which can withstand my input battery of 12V,1.2A??

The inductor i bought is exactly same like
http://www.findtheneedle.co.uk/products/3075199-radial-coil-inductors.asp
Without any codes on the inductor...

Thank you in advance.

 

It depends on the use.

Do you have schematic of the circuit?

 

yaya.. I upload it now... Please change to inductor into 1mH...
Inductor has become a huge problem for me Lack of experience in using it.


Question:
1. Do I think to put a capacitor at front end of this circuit ( as i have seen from other page but I don't know why do I need to)

2. Can I use an NPN 9018 in PIN 5 of my 555timer instead of 2N222?

Thanks

 

Why are you making the circuit?

It sounds like you have little understanding of the operation of the circuit. Maybe you need a commercial kit or commercial power supply to make it easier for yourself.

 

Why are you making the circuit?

It sounds like you have little understanding of the operation of the circuit. Maybe you need a commercial kit or commercial power supply to make it easier for yourself.

it's an assignment
the input must be a batteries...

 

Then I suggest you do your homework on basic boost converter operation and component value design - you will get more marks for describing the design equations involved. There are plenty of good hand-holding design reference around - try some of the commercial controller ICs that are tyrpically used.