Search:

Type: Posts; User: Javid.zare.s

Page 1 of 4 1 2 3 4

Search: Search took 0.01 seconds.

  1. Replies
    4
    Views
    403

    [SOLVED]Closed: Re: driving a relay (5v supply)

    yep, I found that out. I searched before posting new thread but I couldn't find out the wiring diagram of my relay.
  2. Replies
    4
    Views
    403

    [SOLVED]Closed: driving a relay (5v supply)

    hi, I was planning to drive a relay for a small ldr project but I don't know why the relay does not turns on
    the voltage is only 5 volt for now and I'm planning for 9v for later( if it don't blow...
  3. Replies
    2
    Views
    295

    Closed: Re: Solder tip sizes (need smaller tip)

    soldering microusb port is a little tricky and I don't know how thick is your soldering iron, if you think you have to change it then buy a replacement tip, I bought my self an ironing tip last few...
  4. Replies
    5
    Views
    516

    Closed: Re: Fan transformer repair, help needed

    Ive connected them randomly and the motor is spinning for now!
    but its slower,for now my max speed is like the min speed.
    tried all possible configuration and all the same,
    now my question is does...
  5. Replies
    5
    Views
    516

    Closed: Re: Fan transformer repair, help needed

    no I don't have that thing, just a multimeter
    a new fan is a waste of money for me, I should repair it no second option
  6. Replies
    5
    Views
    516

    Closed: Fan transformer repair, help needed

    Hi there, hope everyone has a good time.
    I'm repairing my desk fan which seems 3 wires are torn (or more)
    I carefully took them out for welding. but the thing is I don't know which two should be...
  7. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Re: Tip41c/42c arrangement problem

    no I don't buy stuff from ebay ali.... it is not cause I don't want to ,actually they are unavailable here in Iran, all for government and economical sanctions...
  8. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Re: Tip41c/42c arrangement problem

    -it was the cheapest so definitely fake, but operating fine just like original.
    -yes I did measure 100 ohm res and is 100 ohm
    -do they really do such a thing? I mean replacing transistors with...
  9. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Re: Tip41c/42c arrangement problem

    1)exactly 13.7 v to be accurate
    2)timer pins order is right and circuit operating at 120volt at output
    3)yes they are
    -I have no idea for that heat, maybe the timer chip is faulty and I need to...
  10. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Re: Tip41c/42c arrangement problem

    in my last post i said i reassembled everything and attached them on project board for now , so forget about that messy welding . everything works well before connecting a load which generates heat...
  11. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Re: Tip41c/42c arrangement problem

    this circuit is supposed to be used with a solar panel when camping, the output of it is regular ac to charge different devices such as flashlights phones etc, thats the load (adapter) that im...
  12. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Re: Tip41c/42c arrangement problem

    hi again, I've desoldered everything and rearranged them on project board, circuit works ,i used a transformer which gives 120volt ac at output.
    there's no thermal issue until I connect a load which...
  13. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Re: Tip41c/42c arrangement problem

    what? 5 watt only? no I was thinking about at least 20watts
    I wanna use it for our camping where we need to charge flashlights and cell phones
    so there will be at least 2 devices charging at the...
  14. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Re: Tip41c/42c arrangement problem

    LoL, I wasn't expecting much heat from it so there's not much space for cooling department.
    but beside all terrible soldering and stuff... is the transistors wired right?(legs are not shorted for...
  15. Replies
    38
    Views
    1,788

    [SOLVED]Closed: Tip41c/42c arrangement problem

    hi, im rebuilding a dc to ac converter which I was able to build last year
    after that I just disassembled everything from project board. now I'm trying to build that same design but It's just making...
  16. Closed: Re: whats the waveform icon on multi-meter

    the u-manual is not accessible, so im askin here.
    does sqare wave refers as "digital signal?"?
    if my signal is square it means it can measure its frequency?
  17. Closed: whats the waveform icon on multi-meter

    hi , as you know there are many buttons on digital multimeter and I have the cheapest one.
    I've read some articles and I'm wondering that does this button also shows the frequency?
    if yes, why it...
  18. Replies
    5
    Views
    494

    Closed: Re: simple proximity sensor, help needed

    tnx mr Brian!
    so is this the right configuration?
    153505

    if this works I'll try to do something about ambient light as you said to.
    my problem is pulling the trigger for now
  19. Replies
    5
    Views
    494

    Closed: Re: simple proximity sensor, help needed

    so this means it cannot be modified to perform my task?
  20. Replies
    5
    Views
    494

    Closed: simple proximity sensor, help needed

    hi everyone, I got free time and I want to build a circuit similar to the design of this site,
    https://circuitdigest.com/electronic-circuits/ir-detector-circuit
    as described in the website it...
  21. Replies
    7
    Views
    1,145

    Closed: dc to ac coverter circuit not working

    hello guys, I ve designed a coverter from a premade schematic which by the way did work fine last time (1 year ago on project board ) now ,I reassembled it and can't make it work again

    I don't...
  22. Closed: Building a heat gun out of hair dryer?

    hi fellas, since I know how a heat gun works and I have an extra hair dryer in house, im wondering if it possible to turn that into a heater that can be used to solder ---->SMD & chips<----
    its...
  23. Replies
    16
    Views
    1,254

    Closed: Re: efficient led driver circuit?

    oh not for indication or anything else, I wanna use it as flash light, here's how they look, voltage across each led is 2.5 volts
    152270
    my arrangement is calculated by this website :
    152271


    ...
  24. Replies
    16
    Views
    1,254

    Closed: Re: efficient led driver circuit?

    thanks for the reply, I don't know much about electrics, there are 6 leds and honestly I don't know how to put them together, In parallel or series? I configured into 3 groups of parallel and in each...
  25. Replies
    16
    Views
    1,254

    Closed: efficient led driver circuit?

    hi, since my powerbank didn't come with leds im planning to add 6 leds on it but the problem is that using them with resistors generates a lot of heat and I feel uncomfortable about this, so im...
Results 1 to 25 of 89
Page 1 of 4 1 2 3 4