I have a sony bullet camera and when I move the power adapter
(switching) far away by extending the wire, It can,t power up the
camera. Is voltage drop really an issue with such a small device? if
yes, where do I find the formula for 12v stuff.

What distance are we talking ???
Tell us more .

"NN" wrote in message
ups.com...
I have a sony bullet camera and when I move the power adapter
(switching) far away by extending the wire, It can,t power up the
camera. Is voltage drop really an issue with such a small device? if
yes, where do I find the formula for 12v stuff.

Measure the resistance of your power cable and use ohm's
law to determine how much voltage you'll lose. You're
probably using wire much too small for the purpose.

NN wrote:
I have a sony bullet camera and when I move the power adapter
(switching) far away by extending the wire, It can,t power up the
camera. Is voltage drop really an issue with such a small device? if
yes, where do I find the formula for 12v stuff.

"NN" wrote in news:1155153647.457201.225090
@i3g2000cwc.googlegroups.com:

I have a sony bullet camera and when I move the power adapter
(switching) far away by extending the wire, It can,t power up the
camera. Is voltage drop really an issue with such a small device? if
yes, where do I find the formula for 12v stuff.



Well, yes, evidently the camera is drawing enough current that the voltage
drop is too large with the wire size you're using. Just try a larger size
wire. For an application like this, the wire can be too small, but it
can't be too large.

M Berger wrote:
Measure the resistance of your power cable and use ohm's
law to determine how much voltage you'll lose. You're
probably using wire much too small for the purpose.

NN wrote:
I have a sony bullet camera and when I move the power adapter
(switching) far away by extending the wire, It can,t power up the
camera. Is voltage drop really an issue with such a small device? if
yes, where do I find the formula for 12v stuff.

Do you get a reliable reading without the load. I know that it applies
to batteries charged but I not sure here. I guess it could be just as
easily measured with the carmera attached.

Jim Land (NO SPAM) wrote:
"NN" wrote in news:1155153647.457201.225090
@i3g2000cwc.googlegroups.com:

I have a sony bullet camera and when I move the power adapter
(switching) far away by extending the wire, It can,t power up the
camera. Is voltage drop really an issue with such a small device? if
yes, where do I find the formula for 12v stuff.



Well, yes, evidently the camera is drawing enough current that the voltage
drop is too large with the wire size you're using. Just try a larger size
wire. For an application like this, the wire can be too small, but it
can't be too large.
Ok , all points to needing larger guage wire, I have a lot of phone
wire with 4 strands, can I use two strands per connection to double the
size? For example, does a 6 gauge wire behave the same way as two
insulated 3 gauge wires use together?

"NN" wrote in
oups.com:


Ok , all points to needing larger guage wire, I have a lot of phone
wire with 4 strands, can I use two strands per connection to double
the size? For example, does a 6 gauge wire behave the same way as two
insulated 3 gauge wires use together?

Yes, but the other way around. (6 gauge wire is *smaller* than 3 gauge
wire.) Two 6 gauge wires connected in parallel will give the same
voltage drop as one 3 gauge wire. (Assuming American Wire Gauge.)

However, your telephone wire is likely to be more like 26 or 28 gauge,
fine for carrying telephone conversations, but very small for carrying
current to your camera. Try something a lot larger, like 18 gauge (the
wire for an electric lamp) or 16 (an extension cord) or 14 (house
wiring).

Jim Land (NO SPAM) wrote:
"NN" wrote in
oups.com:


Ok , all points to needing larger guage wire, I have a lot of phone
wire with 4 strands, can I use two strands per connection to double
the size? For example, does a 6 gauge wire behave the same way as two
insulated 3 gauge wires use together?

Yes, but the other way around. (6 gauge wire is *smaller* than 3 gauge
wire.) Two 6 gauge wires connected in parallel will give the same
voltage drop as one 3 gauge wire. (Assuming American Wire Gauge.)

However, your telephone wire is likely to be more like 26 or 28 gauge,
fine for carrying telephone conversations, but very small for carrying
current to your camera. Try something a lot larger, like 18 gauge (the
wire for an electric lamp) or 16 (an extension cord) or 14 (house
wiring).
Yes , I got it the sizes reversed.


Thankyou for all the help leading to the solution

NN wrote:
Jim Land (NO SPAM) wrote:
"NN" wrote in news:1155153647.457201.225090
@i3g2000cwc.googlegroups.com:

I have a sony bullet camera and when I move the power adapter
(switching) far away by extending the wire, It can,t power up the
camera. Is voltage drop really an issue with such a small device? if
yes, where do I find the formula for 12v stuff.

35 feet... youve just answered your own question. Try using mains
cable, phone wire wont be much use.

NT