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Recent content by israel_Y

  1. I

    inverting output of opamp to MCU adc in differntial mode

    Dear juan, Thank u so much. is the drawing at the positive input of the opamp?? (or could u draw the circuit with the opamp)? have u simulated the circuit? Thank you
  2. I

    inverting output of opamp to MCU adc in differntial mode

    Hi Juan_zo, Thank you for your answer. but i am avoiding adding any opamp or ADC buffer.. i was looking a way around simply
  3. I

    inverting output of opamp to MCU adc in differntial mode

    Hello, can i connect an inverted opamp output (0 to -3.3V output) to ADC of microcontroller (stm32) configured in differential mode. From The MCU datashet it says [In differential input mode, the analog voltage to be converted for channel “i” is the difference between the external voltage...
  4. I

    problem with APD biasing

    The circuit i am planning to adopt is just the one mentioned earlier. One i got from previous edaboard post (https://www.edaboard.com/threads/279515/) and from LT application note. I have attached the images here.
  5. I

    problem with APD biasing

    Thank you for your reply, so to get output 140V, if i use 1M and 8.9Kohms, will it give the right result. and do i have to change the other components?
  6. I

    problem with APD biasing

    I am trying to bias APD at about 130-140V I have found schematics from this forum ( vout = 160V) aswell as from Linear technology application note (http://cds.linear.com/docs/en/application-note/an118fa.pdf) page 7, figure 17, Vout 200. My problem is that i don't quite understand how the...
  7. I

    Need suggestion for constant current and temperature compensated LED driver

    My question is related to thread https://www.edaboard.com/threads/244722/. but since the thread is old i am starting a new one. I want to build a sensor using LED so i need a constant brightness and temperature compensating driver (so no drift in wavelength with T) with a good precision. I...
  8. I

    frequency counter (using timer1 and CCP module)

    ow yes, sorry, i jst did. [almost 4am here forgive my overlooking] i get a frequency reading, its great but not very accurate. fr f = 800Hz i get 7.096e-1 KHz; for 3kHz, output = 2.75, for 11.2k output = 11.57k. for higher frequencies its good i guess.. can u pls share the code, or what...
  9. I

    frequency counter (using timer1 and CCP module)

    its built-in function under the "_Lib_Delays.c" [Mikroc V.6.0.0] the excerpt for Get_Fosc_kHz() code is: unsigned long Get_Fosc_kHz(){ return Clock_kHz(); } i have tried using a constant in place of the 'clk =Get_Fosc_kHz(); but gave me no difference.
  10. I

    frequency counter (using timer1 and CCP module)

    ok, i hv attached the project files. thank u
  11. I

    frequency counter (using timer1 and CCP module)

    Dear jayanth.devarayanadurga, I have attached the code and proteus files here. thanks for your time. Dear shatruddha, when i check with Proteus, it seems, the interrupt isr is never initiated. but i dont know what i am doing wrong.
  12. I

    frequency counter (using timer1 and CCP module)

    i hv tried with proteus, and also with mikroc's own debugger tool, and output frequency is always =0.
  13. I

    frequency counter (using timer1 and CCP module)

    I have modified the code like you said, clearing the CCP inturrupt, and also made some changes, but still with no luck // Define LCD module connections. sbit LCD_RS at RD1_bit; sbit LCD_EN at RD0_bit; sbit LCD_D4 at RD4_bit; sbit LCD_D5 at RD5_bit; sbit LCD_D6 at RD6_bit; sbit LCD_D7 at...
  14. I

    frequency counter (using timer1 and CCP module)

    I m writing frequency counter for 16f877A using mikroc: my code is seen below. please guide me where it is wrong as it doesnt give any output when i run it in proteus. // Define LCD module connections. sbit LCD_RS at RD1_bit; sbit LCD_EN at RD0_bit; sbit LCD_D4 at RD4_bit; sbit LCD_D5 at...
  15. I

    Parametric simulation with orcad capture- transient analysis unreliability

    Dear LvW, the sensor has very high R resolution (deltaR) even less than 1 ohm thats why . you might be right for actual implementation, the opamp might give me some offset and mismatch problem... but for simulation sake only, the UIC option helped perfectly.. if u have any suggestion to read...
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