Search results

Search Forums New Posts
  1. (*steve*)

    Upload code from pic

    I guess that with Harvard architecture, this becomes somewhat easier.
  2. (*steve*)

    Voltage Divider vs Series Resistor

    That's somewhat misleading.
  3. (*steve*)

    Upload code from pic

    The microcontroller may have the security set so that you can't read from it, and even if you can, you'll get hex code, not readable source.
  4. (*steve*)

    Pin 7 of 555 timer doesn't discharge

    Possibly :-) What are you trying to do? The solution may need to be tailored to it. Practically speaking, it may be simpler to use a microcontroller. A PicAXE can be obtained in a package the same size as a 555 and probably do what you want with no external components! (other than a couple...
  5. (*steve*)

    Why DC motor draws more current with friction?

    no, but we understand what's happening. it would also be useful to know where you're measuring the voltage. and how you're measuring the peak current. there are no spooky actions which will allow a motor to tell a power supply to reduce the voltage.
  6. (*steve*)

    Why DC motor draws more current with friction?

    Can you measure the DC resistance of the motor and remind me again what voltage you're running it from. Then use ohms law to determine the stall current. Is this < 5A? Was the power supply set to have current limiting?
  7. (*steve*)

    Why DC motor draws more current with friction?

    This is the fault of the power supply not the motor. I can't say why it happened (maybe the motor demanded more than 5A?) but that's the reason.
  8. (*steve*)

    Pin 7 of 555 timer doesn't discharge

    Aaaah, long periods and the 555. I'm sure we have a resource about that. The 555 is really not suited to it. There are other, better methods.
  9. (*steve*)

    Digital Potentiometer and Power Supply

    your resistors require 3V to draw their rated current. Keep the voltage close to 3V x the number of resistors in series. I recommended 2 in series, so have pairs of batteries in series. this is not a trivial question. There are many variables.
  10. (*steve*)

    Pin 7 of 555 timer doesn't discharge

    what is the value of the cap marked as 22kufd? if it is greater than some small value (it is mentioned in the datasheet) then you risk destroying the discharge transistor in the 555. I suspect this may be the cause of your problem.
  11. (*steve*)

    Digital Potentiometer and Power Supply

    and with that, I simply repeated the answers you got in another thread. try not to do that.
  12. (*steve*)

    LED Signal Dummy load

    one really good option is to place a red LED in parallel with 4 silicon diodes (in series). Two of these can then be placed in inverse parallel. This can indicate current flow between mA and amps with little change in the brightness of the LED.
  13. (*steve*)

    Pin 7 of 555 timer doesn't discharge

    can you post your circuit diagram.
  14. (*steve*)

    Digital Potentiometer and Power Supply

    if the strings are not the same length you can't put them in parallel without the shorter string hogging current. You might end up with a fiery hot stomach and barely warm chest and back. a simplistic calculation of power is that each battery can provide 3.7 x 4.8 Wh of energy. The heat pack...
  15. (*steve*)

    LED's and constant current

    I agree, "should". But find me one that does, or even better, one that refuses to offer this as a solution :(
  16. (*steve*)

    Why would signal get reflected without proper ohmic termination?

    Excellent video from the time before the world was in color.
  17. (*steve*)

    LED strip light not powering up after installation.

    an open circuit will cause the lights following it to turn off. A short anywhere can cause all to go off, but it does depend on the resistance of the wire. A short will also overload your power supply.
  18. (*steve*)

    Partially shaded solar panels

    some panels are described as having a certain number of diodes. These apparently allow part of the panel to be shaded, however Murphy will always ensure you don't have the right parts shared. Another option is "micro inverters" where each panel (or sometimes each pair of panels) has its own...
  19. (*steve*)

    LED strip light not powering up after installation.

    bell wire is solid core and it is possible there is a break in it. Stranded wire would be better. its also possible you have a poor connection or an intermittent short.
  20. (*steve*)

    Low voltage cutout help

    you will need to use this transistor as a high side switch with a pull up on the output of the 339. The emitter goes to +ve, collector to the relay, base, via a resistor (around 1k) to the output of the 339. The base should also be connected to +ve via another 1k resistor. The other end of the...
Top