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  1. 5

    pcb DRY DILM problem

    ii have big problem with dry film i buy from china negative dry film. i use soduim carbonate to developing dry film . after developing i see the copper good when i put pcb in ferric chloride to etching it. the some pcb area is not etching because there are an Transparent layer protect copper...
  2. 5

    pcb DRY DILM problem

    are there problem in dry film ?
  3. 5

    pcb DRY DILM problem

    Re: pcb DRY fILM problem this photo the pcb in the ferric chloride and the pcb copper not etching and copper still shiny
  4. 5

    avr timer interrupt problem

    thank you the problem is solved the problem because i use delay_ms with timer interrupt and this corrupted delay_ms time. thank you
  5. 5

    avr timer interrupt problem

    i use mikroc compilier when i use timer interrupt . when is there timer over flow the timer interrupt function is work. but when avr cpu is return from interrupt function it's not return to the last programm adress(when intterupt is done) but it start from beganing from the main code and...
  6. 5

    pcb DRY DILM problem

    pcb DRY fILM problem i buy from china negative dry film. i use soduim carbonate to developing dry film . after developing i see the copper when i put pcb in ferric chloride to etching it. the pcb is not etching because there are an Transparent layer of dry dry film " i use a correct layer...
  7. 5

    strange problem pic16f877a

    i use this circuit but without diode and i use 4mhz crystal. when i remove 4mhz crystal from my circuit the pic16f877a is work but slow" see post 1# " . it's means pic16f877a clocked by internal osc.
  8. 5

    strange problem pic16f877a

    #7 i set clock in mikroc at 4mhz. #8 yes delay_ms is software generated delay. #9 post code in post 5# , i use simple circuit pic + reser resistor + crystal and 2 cap i try 22p and 15p and no capictor and problem still #10 i try 3crystal and problem is still...
  9. 5

    strange problem pic16f877a

    i try this code and the problem is still. - - - Updated - - - yes i do this
  10. 5

    strange problem pic16f877a

    mikroc pro 4.6 chip pic16f877a crystal 4mhz xt void main() { TRISD=0x00; // TRISD OUTPUT while(1){ portd=1; delay_ms(500); portd=0; delay_ms(500); } } work in simulation . but in my real circuit delay is 10 sec no .5sec
  11. 5

    strange problem pic16f877a

    i use xt 4mhz crystal and i try long time and no solution. the problem is. i make simple loop. on and off an led with 500ms delay . it work in simulation . but in my circuit it's take about 10sec to flashing led. :?:
  12. 5

    avr usb asp programmer help

    ok thank you . i think problem in my programmer
  13. 5

    avr usb asp programmer help

    avr usb avr programmer i build avr usb programmer . but i have problem i have 6 usb port in my pc . my programmer work only with 2 port. and when i connect it with other 4 port give me this "device not recognized"
  14. 5

    s3c2440 maximum gpio speed

    what is s3c2440 maximum gpio io pin speed in mhz . i need gpio speed. not cpu core speed.
  15. 5

    help to buy fm oscilloscope

    what is minimum oscilloscope sample rate .to read fm transmitter signal
  16. 5

    help to buy fm oscilloscope

    hii friend i want to buy oscilloscope for fm transmitter circuit. what is the features of oscilloscope to buy .
  17. 5

    smps zener make me crazy

    hiii, i have a cheap smps running by one transistor. and i want to increase voltage . this transistor controlled by zener diod. but when i replace the original diod with another one. the led power in circuit make flashing. i think it flashing because i changed the zener value. when i replace...
  18. 5

    i want pic programmer circuit.

    i see the schematic in this link https://www.edaboard.com/threads/238522/ and it's can't work with usb to serial conversion. there are some circuit use pic16f628a with tx and rx from pc. i want this circuit
  19. 5

    i want pic programmer circuit.

    thank you for helping me :grin:
  20. 5

    i want pic programmer circuit.

    thank you pickit2 use pic18f2550 and it's price 5$ and above. usb to serial convertor chip about .5$ . jdm circuit not work with usb to serial.

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