Search results

Search Forums New Posts
  1. C

    Suggestions for building a PIC dev. board?

    "relying on a transistor to sink a current for each output." ????????????????????? You always need a buffer device when the current is more than 25mA.
  2. C

    Suggestions for building a PIC dev. board?

    PIC Lab-1 Pick Lick-1 P1 P2
  3. C

    Suggestions for building a PIC dev. board?

    When you got the larges electronics wensite on the net, of course it is hard to navigate. That why I have an alphabetical index with Start here with PIC12F629 http://www.talkingelectronics.com/FrameworkPages/cont13-Pic629.html
  4. C

    Smoothing Capacitor/Vripple

    " Seagulling threads again, Colin? You need to start reading from the beginning otherwise you might embarrass yourself. That's taken care of by the factor of 2 in the formula (which is 1 for a half-wave rectifier) as Claire explained in post #1:" And yet is post #4 she still says"I know that...
  5. C

    Smoothing Capacitor/Vripple

    "I know that from the paper the full wave bridge rectifier has a 50Hz frequency." The input may be 50Hz but the output is 100Hz.
  6. C

    PIC programming

    "I'm planning on using a PIC16F8X as a simple frequency counter" It has already been 2 weeeeeeks for a reply from you. This is going to take you 4.56 years to get a programming working, at this rate.
  7. C

    Suggestions for building a PIC dev. board?

    I have a very simple PIC12F629 development board. This is where you start if you want to get into PIC programming. I also teach assembly programming and have a library of routines.
  8. C

    electronic cycle counter

    How many cycles do you think?
  9. C

    Smd test tweezers

    The tweezers are 100% accurate. The inaccuracy comes from the surrounding components.
  10. C

    How to select proper rating fuse!!

    It depends on the current capability of the transformer. If the transformer is capable of delivering 500mA, the fuse will never blow. You have to fit a 315mA fuse and turn the circuit on and off 100 times with 5 minutes between. Look at the fuse and see if it "dips."
  11. C

    How to select proper rating fuse!!

    A 500mA slow-blow is far to high to provide protection. The only time this type of fuse will blow is when the project has short-circuited. In fact you cannot protect a 150mA circuit. Even a 315mA will only blow when the circuit has shorted. Any small rating fuse will just bend when the...
  12. C

    Need help with circuitboard design

    I can add it to my panel, which I get made every week. I get 10 panels.
  13. C

    Help with LED strobe

    If the load is open the OR gate will see high current through the base. But the load is not open. I see what you mean. The collector can only rise to 8v and the 2k2 will take up the difference between the base voltage and the output of the OR gate. The approx 3v across the 2k2 will allow just...
  14. C

    Help with LED strobe

    The the transistors are emitter-followers so you don't need the 2k2 resistors.
  15. C

    Multiple led fading circuit with 555 timer

    Just parallel them up.
  16. C

    Multiple led fading circuit with 555 timer

    Here are two up/down fading LED circuits:
  17. C

    Transistorise frequency divider

    Here is a UPB1508 3 GHz ÷2 Prescaler chip for $8.00 posted from eBay http://www.ebay.com/itm/UPB1508-3-GHz-2-Prescaler-chip-NEW-Divider-uPB-1508-/150412885235?pt=LH_DefaultDomain_0&hash=item23054e7cf3 . . . just what you want . . . . ...
  18. C

    Transistorise frequency divider

    Getting a multivibrator to work at 500MHz is very difficult.
  19. C

    Resistance of Primary Winding of a Transformer

    smart-prototyping is even cheaper than Elecrow
  20. C

    Type of relay

    You will need 2 relays. One to provide power to the second relay and the second relay to provide the forward/reverse to the motor.
View older results
Top