Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



WTB: SMT SMD low Ohm Current Sense Resistors

TheMonk

New member
Joined
Aug 29, 2007
Messages
750
Points
0
I am looking for some SMD 1206 or 0805 resistors
0.15 Ohm
0.39 Ohm

anyone want to sell me a few? or knows where to buy those for cheap. I could not find them on eBay or
http://www.vakits.com/index.php?cPath=111_112.
 



TheMonk

New member
Joined
Aug 29, 2007
Messages
750
Points
0
I try to modify the existing drivers with these valus.

The Dorcy driver puts out 340mA using the 0.33 Ohm resistor, after I replaced the 0.33 Ohm with 0.25 Ohm it puts out 360mA. I would like to see the Dorcy puts out 420mA for Open Can diode and maybe 250mA for 16x diode.
 

BlueFusion

New member
Joined
Aug 15, 2007
Messages
1,880
Points
0
so, you don't actually want them for current sensing... you want them to adjust current. If you don't know whether a particular resistor exists, not being able to find it is probably an indication that it doesn't exist. Try a pot somewhere or maybe even combine a few resistors (just google 'parallel resistor calculations') to get the desired result.
 

TheMonk

New member
Joined
Aug 29, 2007
Messages
750
Points
0
BlueFusion said:
so, you don't actually want them for current sensing... you want them to adjust current. If you don't know whether a particular resistor exists, not being able to find it is probably an indication that it doesn't exist. Try a pot somewhere or maybe even combine a few resistors (just google 'parallel resistor calculations') to get the desired result.

These resistors do exist, but the kits cost $50. The pot would be ideal if they can do 0.1 Ohm ~ 1 Ohm. I still need low Ohm resistors to run them in parallel.
 

toked323

New member
Joined
Sep 1, 2007
Messages
1,591
Points
0
hey monk try www.mcminone.com or digikey or buy the new dorcy's they put out around 415ma
 

TheMonk

New member
Joined
Aug 29, 2007
Messages
750
Points
0
toked323 said:
or buy 0 ohm smd resistors they are really 0.2 ohms
I removed a 0 Ohm resistor from DVD circuit board and measured using digital Ohm meter set to 200 Ohm (lowest settings) I got 0.1 Ohm. I then used an analogue meter set to RX1, I got 0 Ohm.
 

toked323

New member
Joined
Sep 1, 2007
Messages
1,591
Points
0
there is no such thing as 0 ohm though it just has extremely low resistance that it doesn't really make a difference mine measure 0.2ohms
 




Top