Orlando,

How can you choose the most electrically efficient LED easily? I spent a week going over hundreds of LED specs to calculate the results, and I do not plan to do this again when the next wave of new LEDs hits the industry.

Thanks ahead of time.

E

Hello Orlando.

I need to buy an Incremental Optical encoder in order to control a DC motor.

I need it to be cheap and indeed i found some encoders but they all have mechanical "ticks" (like the feeling of a volume control in a digital radio used in any car)  which make them suitable for dashboards but not to motion control.

all the "smooth spinning" encoders i found cost about or more than 100$.

Is there any cheap option (roughly about the same price than the "tick" encoders) in farnell or any other small quantities vendor?

The motor i'm talking about does not spin very fast therefore max RPM as well as PPR are not very critical parameters.

The supply voltage must be 5v or similar.

could you supply me also with a part number  for a matching mechanical axis coupling?

Best Regards

hi shivang, i  think i understand your problem, but not sure what the best solution is.:

are your forcing the current from all 8 leds trough one resistor?

is so, you are increasing the voltage drop on that paticular resistor alowing less voltage for the leds to shine. in other words, you´re "choking the current".

the more leds turned on in one row, the less voltage each led will have. thus less current, less shine.

i would eliminate the resistor and connect directly to ground and relay on fast switching times to avoid excess current / led burnout.

in other words, turning  leds on and off rapidly should do the trick, i started with on-times of .5ms and off-times of 100 ms and gradually increased the on-times to give more brightness.

like i said, this works, but not sure if it is the best solution.

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