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  1. MP1

    remote control using radio freq

    Here is how it can be done for LEDs: http://users.cableaz.com/~cappels/dproj/ledpage/leddrv.htm MP
  2. MP1

    Designing a computer based voltmeter

    Just thought I would post some ideas for you: Depending upon the range of input voltage, you could use a voltage divider to scale the voltage down to 0-5. This would limit the range you would be able to measure due to resolution limitations and you would want to use precision resistors with a...
  3. MP1

    Low-pass Filter?

    Yeah, if you can't get it to work, much easier to design another one from scratch than find the fix. Hostile attacks on you? Whatever ::) Sounds like a little paranoia there. MP
  4. MP1

    KVM switch circuit / Multi-pole double throw switch

    How are you getting bidirectional from this snippet of schematic? I do not see that. I see input and output clearly stated. Author states he is trying to light LEDs with the switch. MP
  5. MP1

    8pins IC holder datasheet

    I just posted the answer to your other post. It looks like you are duplicating posts. Either IC package will be fine and yes pin 1 to pin 1, 2 to 2, etc. MP
  6. MP1

    eagle drawing(SOIC to DIL socket 8pins)

    That is correct. The only differences I can see in those two IC packages is the silk screen on the component side. You can use either one. Also correct, just connect pin 1 to pin 1, pin 2 to pin 2, etc. MP
  7. MP1

    to know what topics i have posted

    Including this one, you have made 5 posts. Is it that hard to keep track? ;D But seriously, if you would like to keep track of replies, you can click the "notify" button on the page and you will be e-mailed a notification when someone has posted a reply to your post. Is this what you are...
  8. MP1

    KVM switch circuit / Multi-pole double throw switch

    switching and multiplexing chips are highly dependent upon the impedance of the circuit. Something like the CD4053 is pretty common for the family of CMOS switches. Any answer you get here will depend upon the rest of the circuit which you have not posted. Ohm out the devices you are switching...
  9. MP1

    temp sensor cooling system

    darrins, LM35 for degrees C. MP
  10. MP1

    atx power supply for robot

    They are idiots. I have a CNC drill machine that I built years ago which uses a computer power supply to control 3 steppers. This unit runs for hours at a time. I originally used a linear supply but I did not like the heat it generated or the losses in the conversion. You will not have any...
  11. MP1

    Low-pass Filter?

    The theory section is the perfect place for you to post this, since: a. You have not attempted to build this project b. You do not know the intentions of the original author for the separate stages c. The circuit works fine in several different simulator programs (with simple schematic...
  12. MP1

    8pins IC holder datasheet

    If you still need help with this in eagle, let me know the two library parts you want to combine and I will help you with it. MP
  13. MP1

    Designing a computer based voltmeter

    ...and how were you going to run 12 VDC into the ADC of a PIC? Better figure this into the design, cause the ADC is not going to like more than 5 VDC. MP
  14. MP1

    3-Axis Stepper Controller

    I agree. Both of these items could cause your steps to fail. On the other side of the spectrum, if your pulses are too fast you would get the same result. In this case, all you would need is to slow down the steps in the software. Hope it is a simple fix. MP
  15. MP1

    led display digital voltmeter

    C6 and C7 are bypass caps for the supply lines. Depends upon how you are powering this device as to whether you need them or not. You can leave then out in the initial design and add them if needed. No harm will come to the circuit without them. The value will depend upon how much filtering is...
  16. MP1

    3-Axis Stepper Controller

    Usually when the chip goes bad, the holding torque also goes away. How are the pulses on the step pin? MP
  17. MP1

    LM317 Variable power supply

    Use better filtering and do not put more voltage through the regulator than needed. MP
  18. MP1

    IC based FM receiver / Transistor

    absolution, did you ever get home? MP
  19. MP1

    An authorized dealer of high quality electronic kits in USA.

    There is a buy-sell area on this site. Why do you disrespect this site with ads in other areas? MP
  20. MP1

    8pins IC holder datasheet

    It is much better when you can make your own. In eagle, you create a blank schematic, then use EDIT, and ADD to retrieve a library part. Put both parts on the schematic and run the wires from pins on one to the other. Pin 1 to Pin1, Pin 2 to Pin 2, etc. After this, there is an icon at the top...
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