- Joined
- May 24, 2009
- Messages
- 53
- Points
- 8
im looking for the best way to set current and volts for my ttl driver. it is a diy poject and i got confused over in the laser torch area as how to set my current to the diodes i plan on using "just fry'd one ttl driver good thing it was only 5 bucks"
this is what i have :
Computer power supply output 4.93v wired to a homemade Adj Lm317
voltage regulator tuned to an output to 2.83v as directly tested with digital multimeter for volts. The curcuit is similar to this:
This 2.83v is fed to my constant current driver:
I then tested the output of the constant current driver for voltage with multimeter ( 2.8v) Not much of a drop but no load just multi meter.
Next i adjusted the current pot to output of 180ma (no dummy load) just meter.
Questions:
1. Does my current needs to be adjusted while using a dummy load?
suppose to supply up to 600ma but i cant get past 180ma
2. is the diode geting 2.8v or actually less ? as i have measured
no voltage drop. But then again im not measuring things correctly.
i tried to supply my driver with 5v I got more current but i killed it LOL.
If anyone can suggest a better ttl driver for red diodes let me know.
Any help is greatly appreciated
Thanks in advance
dudley
this is what i have :
Computer power supply output 4.93v wired to a homemade Adj Lm317
voltage regulator tuned to an output to 2.83v as directly tested with digital multimeter for volts. The curcuit is similar to this:
This 2.83v is fed to my constant current driver:
I then tested the output of the constant current driver for voltage with multimeter ( 2.8v) Not much of a drop but no load just multi meter.
Next i adjusted the current pot to output of 180ma (no dummy load) just meter.
Questions:
1. Does my current needs to be adjusted while using a dummy load?
suppose to supply up to 600ma but i cant get past 180ma
2. is the diode geting 2.8v or actually less ? as i have measured
no voltage drop. But then again im not measuring things correctly.
i tried to supply my driver with 5v I got more current but i killed it LOL.
If anyone can suggest a better ttl driver for red diodes let me know.
Any help is greatly appreciated
Thanks in advance
dudley