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  1. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    @BradtheRad , @schmitt trigger thanks you for all the support, and a great success speech for me :wink:. i will keeep your word in my mind @schmitt trigger.
  2. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    yes i will post the scope trace :-o
  3. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    oh.. great news... its working. you where correct @BradtheRad & @Audioguru the noise are from the source only the very 1st design worked when i powdered it up using 9V battery & 7805, i am getting correct & 5v level output... Thank you all.:thumbsup:
  4. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    will it this can work please see the link... **broken link removed**
  5. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    i am powering it using arduino 5V
  6. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    I got this output waveform, Do you think i will get the pulse rate after including a band pass filter of 1Hz to 3Hz. since now its giving 50.xx Hz. i am using the above LED & LDR pair. Please refer the images
  7. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    ok. i will try this also... one thing i want to conform with you all, please suggest me what will be the proper way to placing the LED and LDR... i tried both option... 1. at same plane. i.e. receiver transmitter at same direction. and placing finger on it 2. receiver and Transmitter...
  8. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    hello. i tried your design... but i think there some problem 1. i am not able to see any changes in output. 2. this may be due to the gain is 1. but i connected the resistor of 100K between pin 7 & pin 6. but no result. 3. i have made this design please tell me is this correct to get the...
  9. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    what changes should i have to do in resistors value if i want to run this it 5V - - - Updated - - - if you don,t mind, please explain the diagram, i am not able to understand the working of diagram. and what changes should i have to do in resistors value if i want to run this it 5V?
  10. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    What can happen if i use LDR instead of Photo diode
  11. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    Please sagest me what to use and how to do.
  12. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    I am using LM358N dual opamp only. ... i am using 5V supply. and at the 1 stage of opamp i am getting 0.82V. and this waveform finger not placed finger placed... and 0.1V at PIN 1... you were correct... i am not getting 5V at PIN1 there is some misunderstanding i was seeing at pin8 which is...
  13. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    now i have made this changes... 1. D3 is glowing. there is some waveform it PIN7, but its not clear 2. PIN 1 is by default at 5V 3. Sorry i missed to change the supply voltage in diag. but now i ma running all the things on 5V i have uploaded the video because here its not allowing to...
  14. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    @Audioguru thanks for your precious time please look into this This is also not working. i don't understand where i am wrong. i am very new in this opamp things. i don't know how to design as will as debug. 1.. i am getting supply 9V on pin 5 of above diagram. 2.. as per the document the led D3...
  15. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    Here are the images.... images 1 when i removing the finger... image 2 is when i am passing the finger over the sensor. images 3 is when i keep my finger covering the sensor and the changes is schematic... Please reply...
  16. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    Here are the images.... images 1 when i removing the finger... **broken link removed** image 2 is when i am passing the finger over the sensor. **broken link removed** images 3 is when i keep my finger covering the sensor **broken link removed** and the changes is schematic... **broken...
  17. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    OK. I never know that photo diode is more sensitive to IR. i just want see the led is getting lighted or not, since i was not getting the correct waveform, there for i replace IR to red led. but the o/p is still not there... Ok i am changing that red led to IR one... one more thing i have...
  18. ismbn

    [SOLVED] Photo led and Photo Detector of Specific responsive Frequency

    Thank you for all your response @FvM, @berry, @BradtheRad. Thaks for your precious time. Sir BradtheRed According your feedback. 1. These are the feather detail. I am using the 5V as Vcc over all for pulling led & diode and also the source of opamp. The transistor is just for switching i...

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