Society of Robots - Robot Forum
|
Robot Tutorials
|
FAQ
|
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email
?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
News:
Squirrels have fuzzy tails.
Home
Help
Search
Login
Register
Society of Robots - Robot Forum
»
Electronics
»
Electronics
»
Converting 24v to 12v
Print
Author
Topic: Converting 24v to 12v (Read 5720 times)
0 Members and 1 Guest are viewing this topic.
dsesmg
Robot Overlord
Posts: 128
Helpful? 0
Converting 24v to 12v
«
on:
October 09, 2009, 06:32:57 AM »
Hi, is there any way to convert 24v dc voltage to 12v?
I have a 24v dc power supply and I hope I could utilize this voltage to get 12v dc without having to buy another commercial power supply.
Please help me.
Logged
SmAsH
Supreme Robot
Posts: 3,959
Helpful? 75
SoR's Locale Electronics Nut.
Re: Converting 24v to 12v
«
Reply #1 on:
October 09, 2009, 04:10:00 PM »
Although very wasteful, you could use a 12v regulator.
How much current do you intend to pull from the 12v source?
Logged
Howdy
dsesmg
Robot Overlord
Posts: 128
Helpful? 0
Re: Converting 24v to 12v
«
Reply #2 on:
October 09, 2009, 05:05:34 PM »
Hi, how are you?
it is less than 100mA. It is a photo detector.
Logged
SmAsH
Supreme Robot
Posts: 3,959
Helpful? 75
SoR's Locale Electronics Nut.
Re: Converting 24v to 12v
«
Reply #3 on:
October 09, 2009, 06:20:17 PM »
Ahh ok, then a 12v regulator like the 7812 will do fine.
Logged
Howdy
dsesmg
Robot Overlord
Posts: 128
Helpful? 0
Re: Converting 24v to 12v
«
Reply #4 on:
October 10, 2009, 03:40:12 AM »
Hi, thanks a lot.
Do I need to put capacitors before input(24v) and output(12v) pin?
According to the datasheet
http://www.datasheetcatalog.org/datasheets/150/44435_DS.pdf
it seems I don't need extra components.
«
Last Edit: October 10, 2009, 03:41:51 AM by dsesmg
»
Logged
SmAsH
Supreme Robot
Posts: 3,959
Helpful? 75
SoR's Locale Electronics Nut.
Re: Converting 24v to 12v
«
Reply #5 on:
October 10, 2009, 04:45:46 AM »
Maybe a small cap on the output to smooth things out but it is not necessary...
Logged
Howdy
Soeren
Supreme Robot
Posts: 4,672
Helpful? 227
Mind Reading: 0.0
Re: Converting 24v to 12v
«
Reply #6 on:
October 10, 2009, 10:38:28 AM »
Hi,
Yes, you
need
capacitors on both input and output!
It is very foolish to use a voltage regulator without the caps mounted, almost whatever the load.
Logged
Regards,
Søren
A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives
dsesmg
Robot Overlord
Posts: 128
Helpful? 0
Re: Converting 24v to 12v
«
Reply #7 on:
October 11, 2009, 02:50:38 AM »
Hi, How are you?
Thank you for your advise.
Then, how much capacitor value should I use in this case?
Is there any fomular to calculate the required value of capacitors?
Logged
waltr
Supreme Robot
Posts: 1,944
Helpful? 99
Re: Converting 24v to 12v
«
Reply #8 on:
October 11, 2009, 08:09:48 AM »
The Regulator data sheet usually gives recommend cap values. Different regulators could have different cap values.
In general a 0.1uF ceramic cap on the regulars input and output pins.
One reason for these caps is that if there are long wires the regulate could oscillate.
Logged
Soeren
Supreme Robot
Posts: 4,672
Helpful? 227
Mind Reading: 0.0
Re: Converting 24v to 12v
«
Reply #9 on:
October 11, 2009, 01:33:34 PM »
Hi,
I'd use 220nF on the input and 22µF on the output - mounted as close to the terminals of the regulator as possible.
waltr <- you don't need long wires for an uncapped regulator to oscillate, just a little bad luck. Even without oscillations, you still want caps to dampen noise.
Logged
Regards,
Søren
A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives
waltr
Supreme Robot
Posts: 1,944
Helpful? 99
Re: Converting 24v to 12v
«
Reply #10 on:
October 11, 2009, 02:05:15 PM »
Good point Soeren.
Logged
dsesmg
Robot Overlord
Posts: 128
Helpful? 0
Re: Converting 24v to 12v
«
Reply #11 on:
October 11, 2009, 07:09:52 PM »
Thank you.
Logged
Print
Society of Robots - Robot Forum
»
Electronics
»
Electronics
»
Converting 24v to 12v
Get Your Ad Here
data_list