Search:

Type: Posts; User: Allen6502

Page 1 of 5 1 2 3 4

Search: Search took 0.03 seconds.

  1. Replies
    35
    Views
    1,651

    Closed: Re: High Frequency using 8051

    With a max voltage of only 60V, I would try to avoid using IRFZ44N with an operating voltage of 24V DC.

    Here's my sim of your circuit using 60KHz 50% pulses and it looks quite acceptable.

    You...
  2. Replies
    2
    Views
    308

    Closed: Re: Source of resistors without buying bulk

    I used to buy 1/4W leaded resistors from element14. They are in paper tapes and quantity was 50+, 100+, 250+ and 1000+.

    I paid about 1 MYR (USD 0.25) for 4 pieces of resistors. I have bought in...
  3. Replies
    8
    Views
    824

    Closed: Re: Wireless door bell Sender not working

    The Tx PCB looks fine to me. I normally would suspect a bad push button. But as you said the LED lights up OK, then it should be fine too.

    The inductance are printed on the PCB and I couldn't...
  4. Closed: Re: light emitting diode control differ controls

    What if both the switch and the PWM are ON?
  5. [SOLVED]Closed: Re: How to collect parallel data from one port of microcontroller and show to 7segmen

    Yes, I converted it to HiTech C. Now it works on my proteus 7.80 too. Thanks

    133901

    Allen
  6. [SOLVED]Closed: Re: How to collect parallel data from one port of microcontroller and show to 7segmen

    Your RN1 is pulling high with the dipsw also connected to high.
    Your RN2 should be 330 ohm instead of 10k.

    Still waiting for your program codes. Thanks.

    Allen
  7. [General]Closed: Re: What Is Compiler and Programmer (Hardware) For MC68HC705 & GAL16V8D

    Here are 3 68HC705 MCU from eBay. 2 of them have quartz windors and the other one does not.

    So the one doesnt have is either OTP or EEPROM inside.:razz:
    ...
  8. [General]Closed: Re: What Is Compiler and Programmer (Hardware) For MC68HC705 & GAL16V8D

    Does the 68HC705 has a quartz window for UV to erase the program inside? If not, it is an OTP mcu and can only be programmed once.

    Both the 68hc705 and GAL need dedicated programmers. Some...
  9. Replies
    18
    Views
    1,588

    Closed: Re: Bicycle gadget speed detector

    I bought this from eBay and mount it on my bike and my friend's bike as well. If you want to make your own customised one, you can keep the guts and use the magnet and reed detector.
    ...
  10. Replies
    5
    Views
    747

    Closed: Re: how to compile BAS file in MIKROC

    I dont have that BASIC so I cant help you. I try your program with PICBasic Pro but looks like PBP doesnt like your program.

    My best bet is either get some one who has that BASIC compiler to...
  11. Replies
    5
    Views
    747

    Closed: Re: how to compile BAS file in MIKROC

    On the link site, it says that he was using Oshonsoft Basic. The Hex file there was also deleted...

    So just get hold of a copy of that Basic and compile it.

    Allen
  12. Replies
    31
    Views
    4,195

    [General]Closed: Re: Table tennis scoreboard

    Nice work and congratulations. Next step would be designing the display board with display LEDs 10x bigger. ULN2003A should be able to handle the bigger current if each segment not exceeding 60mA....
  13. Replies
    31
    Views
    4,195

    [General]Closed: Re: Table tennis scoreboard

    Wow, that must be a lot of work designing that PCB.

    My only doubt is whether 16F628 has enough program space to do all the stuffs you intended. What is the purpose of the RF transmitter? ...
  14. Replies
    7
    Views
    1,054

    Closed: Re: help with timer circuit

    The circuit seems OK and it works on the proteus sim. To trouble shoot, I would use a watch to compare the basic clock pulse time from the 4001 osc. is correct.

    For easy calculation, I set it to...
  15. Replies
    2
    Views
    781

    Closed: Re: Atmega16 Software enquiry

    Could it be BASCOM-avr ?

    http://mcselec.com/index.php?option=com_content&task=view&id=14&Itemid=41

    Allen
  16. Closed: Re: why this converting analog sin wave to square wave does not work ?

    Your're right. After adding C5 and C8, the square wave looks much better.

    Allen
  17. Closed: Re: why this converting analog sin wave to square wave does not work ?

    I used Proteus and introduced a single kick start pulse and the osc starts to oscillate. pic 1 & 2.

    Then I replace LM324 with LM393 comparactor and I was able to get a nice square wave. pic 3.
    ...
  18. Replies
    13
    Views
    4,269

    Closed: Re: scroll message on LCD assembly code ?

    Like Genovator said....... if I gave you the complete solution on a silver plate, you would not be bothered to study and understand how the program works.

    But still I think I have given you 99%...
  19. Replies
    13
    Views
    4,269

    Closed: Re: scroll message on LCD assembly code ?

    Try the codes here...



    ORG 0H
    RS EQU P2.0
    RW EQU P2.1
    EN EQU P2.2
    PDATA EQU P1
  20. Replies
    87
    Views
    9,895

    Closed: Re: Why this is not working ?

    I dont have proteus 8 so I am simulating using proteus 7.8 and that's what I got. Sorry if that's not the problems you have.

    Allen
  21. Replies
    13
    Views
    1,005

    Closed: Re: Question about NPN Transistors

    Hi AG,

    I think you might be wrong this time. As quoted from the site:



    I think the author was using Japanese transistors where the collector is in the middle and the base is on the right...
  22. Replies
    87
    Views
    9,895

    Closed: Re: Why this is not working ?

    It seems that the pulses at RD0 are at both peaks of the AC wave. An ZC should be generated at the crossing of the zero axis so I think your ZC detection is problematic. See my simulation graph.
    ...
  23. Closed: Re: [Moved]: Problem with 74ls148, voltage dropping below 5

    I simulated your circuit and it does work. I use 3 push buttons with a 10K resistor to represent your sensor.

    Since this is a priority encoder. Only the highest number would be shown at the...
  24. Replies
    2
    Views
    835

    [PIC]Closed: Re: decimal to bcd converting

    If you must run "CALL DECIMAL" as the first instruction, then do it like this:



    call decimal
    goto end
    decimal
    ...... your program here.....
    return
    end end
  25. Replies
    9
    Views
    1,363

    Closed: Re: Proteus schematic, help needed please

    So, you didn't even read the datasheets of 74LS123 when designing your circuit?

    Read page 2 of the datasheet that I attached, carefully and you'll know what I meant...

    Ask any question you dont...
Results 1 to 25 of 121
Page 1 of 5 1 2 3 4