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Led driving circuit for pulse oximeter probe nellcore ds100a

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Asadkh21

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Hi everyone,

I need anyone to assist me in the designing of the LED driving circuitry for Pulse Oximeter Probe Nellcore DS100A.
There is a specific pattern under which the both LEDs glow at a certain frequency and duty cycle.

Anyone can upload the driving circuit schematic or any alternative that can directly be utilized on my project.
Thanks.
 

Have you considered using the 555 timer IC as a pulse generator?

It will provide up to 200 mA to your load. It is inexpensive and easy to use.

- - - Updated - - -

Sample configuration of 555 as a pulse generator.

The resistors and capacitors at left determine the frequency.

By altering volt level on the pin marked 'ctl', you can obtain a range of duty cycle. (Iit also affects frequency).

 
Have you considered using the 555 timer IC as a pulse generator?

It will provide up to 200 mA to your load. It is inexpensive and easy to use.

- - - Updated - - -

Sample configuration of 555 as a pulse generator.

The resistors and capacitors at left determine the frequency.

By altering volt level on the pin marked 'ctl', you can obtain a range of duty cycle. (Iit also affects frequency).


Thankyou sir. Sir I don't want the frequency to change. THankyou anyways.
 

Then you can use two 555 IC's.

The first produces your desired frequency at a very small duty cycle.

Then you adjust the second 555 to produce a pulse of your desired length, each time an incoming pulse triggers it.
 
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