Search:

Type: Posts; User: trastikata

Page 1 of 2 1 2

Search: Search took 0.00 seconds.

  1. Closed: Re: 2 e-i transformers to one e-e transformer

    Hi,

    I don't want to sound rude, but I think my question is quite specific - the addition of the "I-elements" with the purpose of equalization of the core sizes as presented on the drawing.

    The...
  2. Replies
    9
    Views
    2,690

    Closed: Re: Nichrome Wire Circuit

    12v / 5A = 2.4 Ohms and you are connecting 2.2 Ohms load, so you are trying to draw more current than what the supply is capable of delivering.

    The strip is rated 2.2 Ohms but at what temperature?...
  3. Closed: 2 e-i transformers to one e-e transformer

    Hi,

    I have two E-I MOTs with slightly different sizes of the magnetic cores and I would like to rewind them to a single E-E transformer.

    Thus my question is - given the difference in the...
  4. Replies
    4
    Views
    367

    Closed: Re: PIC18F and PWM problem

    I see what you mean, thanks a lot.
  5. Replies
    4
    Views
    367

    Closed: Re: PIC18F and PWM problem

    Thank you Brian.

    The first thing I tested was to see if the PIC is resetting by using another pin held high - the PIC is not resetting. Also the watchdog is disabled.

    What I find strange is...
  6. Replies
    4
    Views
    367

    Closed: PIC18F and PWM problem

    Hi,

    I am trying to implement a PWM on a PIC18F6585. After setting up the PWM registers I get to control the PWM Period and PWM Duty Cycle successfully.



    'PWM_SETUP
    TRISC.2 = 1 ...
  7. Replies
    4
    Views
    353

    [SOLVED]Closed: Re: P-channel fet driver problem

    Thank you indeed that was the problem. I drew the PCB using the wrong model - 2N2222A instead of MMBT2N2222A - looks like their collector-emitter pins are switched.

    Anyway, the TIP122-TIP127 are...
  8. Replies
    4
    Views
    353

    [SOLVED]Closed: P-channel fet driver problem

    Hello,

    I am trying to figure it out why the following circuit is not working properly in reality while in theory should work. It is a P-CHANNEL FET driver shifting the gate voltage within the...
  9. Closed: Proteus - How to speed up zone regeneration?

    Hello,

    I am working on a large PCB with lots of traces and copper fill as ground plane. My PC has an 8-core AMD at 4GHz, 16GB RAM and fast NVIDIA GPU. In the display options I am using hardware...
  10. Replies
    4
    Views
    1,643

    Closed: Re: Pulse Peak Track Hold And Reste circuit

    Thank you, much appreciate your feedback and help!

    - lowered the input capacitor value as you suggested.
    - missed the fact that the comparator is an open drain - I eliminated the FET switches....
  11. Replies
    4
    Views
    1,643

    Closed: Re: Pulse Peak Track Hold And Reste circuit

    Thank you for your suggestions Klaus.

    My question is - is there a principal error in the analogue design that I miss and could cause problems?
  12. Replies
    4
    Views
    1,643

    Closed: Pulse Peak Track Hold And Reset circuit

    Hello,

    I want to measure the peak value of short pulses (close to Gaussian form and about 0.5 - 1 usec duration) spaced at least 50 - 100 usec from each other.

    I came up with the attached...
  13. Replies
    5
    Views
    1,393

    [SOLVED]Closed: Re: Buffering negative voltage through OPAMP?

    Thank you for your help barry but I don't know how to.



    Does the potential difference between the supply terminals (18v vs 9v) affect the "stability" of the output with regards to fluctuations...
  14. Replies
    5
    Views
    1,393

    [SOLVED]Closed: Buffering negative voltage through OPAMP?

    Hello,

    I am buffering a -5v reference with an OPAMP and I have a split power supply +9v and -9v, referenced to ground. So I was wondering if in this case it would make any difference if the...
  15. Replies
    1
    Views
    847

    [SOLVED]Closed: 16x2 LCD - 3.3v modification IC?

    Hi,

    I have some 16x2 LCDs and want to modify few of them to 3.3v specifications. The only difference between the 5v and the 3.3v version is the missing U3, C1, C2 and disconnected J1.

    So any...
  16. Closed: SIM900 - Solution found to random reseting or not detecting the SIM

    Hi,

    I am just sharing some information with the hope that it could be useful to people having this common problem with the SIM900. After fighting with the random restarting of the SIM900 module...
  17. Replies
    28
    Views
    3,585

    Closed: Re: Stable 5 Volt supply

    Ok, it is 10v nominal, but with 350ma load (as you said) this could drop bellow 7.5v - that's why asked you to measure the supply voltage under load.


    If the supply voltage is 10v, output is 5v...
  18. Replies
    10
    Views
    1,234

    [PIC]Closed: Re: Problem in RTC with PIC16F877A controller

    Looking at your schematic I presume that the power supply to the RTC is 5v and the backup is 3v (not 12 as shown)?

    You don't need external load capacitors but you have to make sure that the load...
  19. Replies
    28
    Views
    3,585

    Closed: Re: Stable 5 Volt supply

    1. 7805 and 1117 regulators are LDO regulators and the 7805 needs at least 2.2v difference in the voltage, where the 1117 has about 1.5v dropout. Are you sure that your main supply can keep 7,2 (6.5)...
  20. Closed: Re: Transceiver RX/TX on the same pin with external LNA and PA?

    Please let's stick to the technical part and not go in discussion about the legal issues. I am not in Europe and where and how I will be using the devise is my responsibility.
  21. Closed: Re: chronometer didnot work in real prototype but simulation work (protues)

    As shown on your schematic the load capacitors for the crystal C1=1nF and C2=1nF are too high. They should be between 15 pF and 27 pF.
  22. Closed: Re: Transceiver RX/TX on the same pin with external LNA and PA?

    The device I am making is not going to pass any certification nor has a commercial purpose. Besides I am going to use it far from any civilization so this is not going to be an issue :)
  23. Closed: Re: RF receiver bothered by high current flows

    If the power supply is 5v and your module allows for 3.3v operation, you can add a 3.3v LDO regulator with few caps and run the RF module and the PIC (most PICs either have a LF series for the same...
  24. Closed: Re: Transceiver RX/TX on the same pin with external LNA and PA?

    The band is 433 MHz where the modulation is FSK.


    In my case the data from a sensor will be transmitted once in a minute and the rest of the time the device will be waiting for instructions....
  25. Closed: Transceiver RX/TX on the same pin with external LNA and PA?

    Hi,

    I am trying to make a RF transceiver with an external LNA and PA while sharing the same antenna. This transceiver module has one RF input/output and the software registers switch the pin...
Results 1 to 25 of 37
Page 1 of 2 1 2