Search results

Search Forums New Posts
  1. Alec_t

    Is this schematic correct?

    How do you arrive at that figure?
  2. Alec_t

    Online PIC Course Legal question

    You would think Microchip would be only too pleased for you to promote their products. Perhaps they're doing their sums to work out how much they are going to pay you? :D
  3. Alec_t

    Circuit that sends 1 pulse when input goes high, 2 pulses when input goes low

    Output pulse amplitude and polarity?
  4. Alec_t

    Power output from a mobile phone aux socket

    Not good for your street cred though :D.
  5. Alec_t

    What are the components required for a paper circuit for transmitting data to android mobile?

    The principle of operation of the touchpad is that of a potentiometer, with your finger acting as the wiper to pick off a fraction of the voltage applied between corners of the resistive sheet defined by the graphite layer. Problems include 1) non-uniformity of the layer, 2) wear and tear of...
  6. Alec_t

    Is this schematic correct?

    What are the voltages between T1 base and ground, and between T1 collector and ground? Changing the R1 value may be helpful in getting oscillations started. Experiment.
  7. Alec_t

    Is this schematic correct?

    Do you have access to an oscilloscope? What are the voltages at T1 base and collector? Are you using the exact transformer shown? Have you tried reversing the polarity of the winding that drives T1 base?
  8. Alec_t

    Trying To Determine Potentiometer Needed For Grizzly G8691 Lathe

    You can still measure the resistance. Measure from end to end of the track (or from end to end of each arcuate chunk, if it's broken; then add the resistances).
  9. Alec_t

    Trying To Determine Potentiometer Needed For Grizzly G8691 Lathe

    So tiz. The image had scrolled off my screen :oops:
  10. Alec_t

    Shaded Pole Fan Motor - Speed Control Question

    If the motor shaft is a standard size perhaps you could find a non-OEM fan blade of better quality?
  11. Alec_t

    Trying To Determine Potentiometer Needed For Grizzly G8691 Lathe

    At the centre of that 'pot' there seems to be an operating tag for what could be a rotary switch. Can you post a pic of the other side of the 'pot' to verify ?
  12. Alec_t

    Need Help for find suitable IC chip

    Looks like one of these.
  13. Alec_t

    Newbie anomaly

    Welcome to EP. The MCU is pulling the voltage down to 1V. No. It would be 2.3V only if the diode were conducting (which it isn't, because the cathode voltage is higher than the anode voltage).
  14. Alec_t

    Benchtop PWM Generator

    Lots of bells and whistles there. A simple analogue PWM generator, with frequency and duty cycle separately controllable with respective potentiometers, could be built cheaply using a TL494 ic.
  15. Alec_t

    Shaded Pole Fan Motor - Speed Control Question

    The vice jaws acted as a magnetic shunt, so that less magnetic flux passed through the rotor. I don't think two separated steel additions would have the same effect.
  16. Alec_t

    TL 494 buck converter

    What is pin 13 connected to? How are the error amplifiers configured? Are any pins floating?
  17. Alec_t

    How do you use a 12v 10a capacitor as a momentary backup battery for bridge

    Might be simpler to diode-OR the three supplies , if the load can tolerate a supply slightly less than 12V (say 11.4V).
  18. Alec_t

    Moving head to camera pan tilt head

    Welcome to EP. Can you post a pic of the one you intend using?
  19. Alec_t

    Simulators?

    I second LTspice. There is a Yahoo LTspice User Group which offers free additional model libraries and support.
  20. Alec_t

    Remote socket control

    Welcome to EP I don't know about sockets with wi-fi links, but there are plenty of remote-controlled sockets available, e.g. these.
Top