Led driving circuit for pulse oximeter probe nellcore ds100a

[Asadkh21]

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.

 

[BradtheRad]

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).

 

[Asadkh21]

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.

 

[BradtheRad]

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.