hi.help please!

[kourosh]

I am kourosh and I am from Iran...
I am doing robotics for some years and ...
At the moment I am going to make a robot for a big match and I need your help(because I have no partner!)
My main problem is electronics.I can not decide for the circuit of nurture
Would you please help to have a good nurture circuit?
many thanks

[chelmi]

I am kourosh and I am from Iran...
I am doing robotics for some years and ...
At the moment I am going to make a robot for a big match and I need your help(because I have no partner!)
My main problem is electronics.I can not decide for the circuit of nurture
Would you please help to have a good nurture circuit?
many thanks

Hi Kourosh!

What do you mean by nurture circuit? (I've never heard of this)
Do you mean power supply circuit? Anyways we need more detail about your bot (size, power requirements, ...)

Michel.

[kourosh]

thank you Michel!

Yes.I mean power supply circuit(sorry I think" nurture circuit" is a little Persian!) 
My robot is a janitor rescuer.I have a 16V battery so my motors are 12V and I need 5V for the micro chip,etc.

[Joker94]

You will be able to get this through a simple linear voltage regulator. I attached a pic to show how easy it is as i could not think how to explain it.

I hope this is what you were after.

[kourosh]

 
thanks,but I knew these things.I need something a lot more professional.

[Dont_Taz_Me_Bro]

thanks,but I knew these things.I need something a lot more professional.

Perhaps you could take a look at the circuit for the 50 dollar robot tutorial. It has the use of a voltage regulator. Couple links should interest you.......

Scroll through the page to see how the circuit is built...perhaps you can copy the idea for your robot:

http://www.societyofrobots.com/step_by_step_robot_step3B.shtml

Also, a really good schematic/pdf was made by a member for the previous example which you might also find helpful:

http://www.societyofrobots.com/robotforum/index.php?topic=3292.msg25198#msg25198    (click on the attachment to the 1st post)

[kourosh]

thanks for your kind reply!
But I had made  some robots like 50$ !
I said something at first"I am going to have a great mach"
I think I'd better not use any 78**

[billhowl]

Perhaps you could take a look at this circuit, The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version. It offers a high-efficiency replacement for popular three-terminal linear regulators like the 78XX. Requires only 4 external components.
http://www.national.com/mpf/LM/LM2576.html

If you need higher currents to drive your motors this LM2678 series of regulators are switching regulator capable of driving up to 5A. Available in fixed output voltages of 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions
http://www.national.com/pf/LM/LM2678.html
http://www.siongboon.com/projects/2005-08-07_lm2576_dc-dc_converter/

[kourosh]

Thank you sooooooo much! I think that's what I was looking for.
I have an other question: Could "78XX TO-3" be useful ?

[kourosh]

I think you didn't understand what I mean.So please look at this to get it better.

[kourosh]

no one understand what I mean?

[waltr]

Thank you sooooooo much! I think that's what I was looking for.
I have an other question: Could "78XX TO-3" be useful ?

To answer simply:
Yes, a 7805 in a TO3 can can be used to drop the battery's 16V to 5.0V. It is a know as a three-terminal linear regulator.
Look up the data sheet for recommended connections and bypass caps.