24 Volt DC to 5 Volt DC - need help constructing a simple
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24 Volt DC to 5 Volt DC - need help constructing a simple

 
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danfman



Joined: 09 Dec 2005
Posts: 2
Posted: Sat Dec 10, 2005 1:36 am    Post subject: 24 Volt DC to 5 Volt DC - need help constructing a simple Reply with quote
It's been a few years since I had an electronics course, so I need help
with a relatively easy question.

I need to reduce 24 volts DC to 5 volts DC. I think it's just a matter
of a couple resistors but am unsure. The amperage is relatively low
(not sure exactly).

Can anyone help? Details would be much appreciated.

Thanks,
-Dan

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Ignoramus17480
Guest
Posted: Sat Dec 10, 2005 1:36 am    Post subject: Re: 24 Volt DC to 5 Volt DC - need help constructing a si Reply with quote
On 9 Dec 2005 13:38:46 -0800, mulletteeth@yahoo.com <mulletteeth@yahoo.com> wrote:
Quote:
It's been a few years since I had an electronics course, so I need help
with a relatively easy question.

I need to reduce 24 volts DC to 5 volts DC. I think it's just a matter
of a couple resistors but am unsure. The amperage is relatively low
(not sure exactly).

Can anyone help? Details would be much appreciated.

Look up a voltage divider circuit. It is made with a couple of
resistors


+24V ---------------------------
|
<
Quote:
R1

|-------------- +5V

<
Quote:
R2

|

0 -------------------------------------------- 0

i
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John B
Guest
Posted: Sat Dec 10, 2005 1:36 am    Post subject: Re: 24 Volt DC to 5 Volt DC - need help constructing a simpl Reply with quote
On 09/12/2005 the venerable mulletteeth@yahoo.com etched in runes:

Quote:
It's been a few years since I had an electronics course, so I need
help with a relatively easy question.

I need to reduce 24 volts DC to 5 volts DC. I think it's just a
matter of a couple resistors but am unsure. The amperage is
relatively low (not sure exactly).

Can anyone help? Details would be much appreciated.

Thanks,
-Dan

7805L regulator. Costs about 50 cents and comes in TO92 package.

--
John B

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Fred Bloggs
Guest
Posted: Sat Dec 10, 2005 5:35 pm    Post subject: Re: 24 Volt DC to 5 Volt DC - need help constructing a si Reply with quote
Quote:
It's been a few years since I had an electronics course, so I need help
with a relatively easy question.

I need to reduce 24 volts DC to 5 volts DC. I think it's just a matter
of a couple resistors but am unsure. The amperage is relatively low
(not sure exactly).

Can anyone help? Details would be much appreciated.

Yeah - details are what's needed- the "amperage" is all important so why
don't you find out what it is before your ask your dumb question.
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John B
Guest
Posted: Sat Dec 10, 2005 5:35 pm    Post subject: Re: 24 Volt DC to 5 Volt DC - need help constructing a simpl Reply with quote
On 10/12/2005 the venerable Dope mcSmoke etched in runes:

Quote:
John B wrote:
On 09/12/2005 the venerable Dope mcSmoke etched in runes:


It's been a few years since I had an electronics course, so I need
help with a relatively easy question.

I need to reduce 24 volts DC to 5 volts DC. I think it's just a
matter of a couple resistors but am unsure. The amperage is
relatively low (not sure exactly).

Can anyone help? Details would be much appreciated.

Thanks,
-Dan


7805L regulator. Costs about 50 cents and comes in TO92 package.


But it might get hot fed with 24V

Yes it might, that depends on the current consumption. But it won't get
any hotter than the dropper resistor in a potential divider and the
output will more stable.

If in doubt use a standard 7805 1A regulator bolted to Mr mcSmoke's
dope tin.

--
John B
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Dope mcSmoke
Guest
Posted: Sat Dec 10, 2005 5:35 pm    Post subject: Re: 24 Volt DC to 5 Volt DC - need help constructing a simpl Reply with quote
John B wrote:
Quote:
On 09/12/2005 the venerable mulletteeth@yahoo.com etched in runes:


It's been a few years since I had an electronics course, so I need
help with a relatively easy question.

I need to reduce 24 volts DC to 5 volts DC. I think it's just a
matter of a couple resistors but am unsure. The amperage is
relatively low (not sure exactly).

Can anyone help? Details would be much appreciated.

Thanks,
-Dan


7805L regulator. Costs about 50 cents and comes in TO92 package.


But it might get hot fed with 24V
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danfman



Joined: 09 Dec 2005
Posts: 2
Posted: Sun Dec 11, 2005 1:35 am    Post subject: Re: 24 Volt DC to 5 Volt DC - need help constructing a simpl Reply with quote
Fred Bloggs wrote:
Quote:
It's been a few years since I had an electronics course, so I need help
with a relatively easy question.

I need to reduce 24 volts DC to 5 volts DC. I think it's just a matter
of a couple resistors but am unsure. The amperage is relatively low
(not sure exactly).

Can anyone help? Details would be much appreciated.

Yeah - details are what's needed- the "amperage" is all important so why
don't you find out what it is before your ask your dumb question.



Ooohh such anger, now I know who the '40 Year Old Virgin' was based on.
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Don Foreman
Guest
Posted: Sun Dec 11, 2005 1:35 am    Post subject: Re: 24 Volt DC to 5 Volt DC - need help constructing a simpl Reply with quote
On 10 Dec 2005 15:01:16 GMT, "John B"
<spamj_baraclough@blockerzetnet.co.uk> wrote:

Quote:
On 10/12/2005 the venerable Dope mcSmoke etched in runes:

John B wrote:
On 09/12/2005 the venerable Dope mcSmoke etched in runes:


It's been a few years since I had an electronics course, so I need
help with a relatively easy question.

I need to reduce 24 volts DC to 5 volts DC. I think it's just a
matter of a couple resistors but am unsure. The amperage is
relatively low (not sure exactly).

Can anyone help? Details would be much appreciated.

Thanks,
-Dan


7805L regulator. Costs about 50 cents and comes in TO92 package.


But it might get hot fed with 24V

Yes it might, that depends on the current consumption. But it won't get
any hotter than the dropper resistor in a potential divider and the
output will more stable.

If in doubt use a standard 7805 1A regulator bolted to Mr mcSmoke's
dope tin.

If you're talking about more than 100 mA, consider a Simple Switcher
from National Semiconductor. Check out LM2678-5.0. It won't need
a heatsink for currents up to 2 amps or more. The website "web
bench" will design the circuit for you, including giving you a parts
list.

http://www.national.com/appinfo/power/webench/
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