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  1. MP1

    High Voltage Stun Gun !

    N4, if you have a good quality voltmeter, you can measure the voltage directly. Most will measure 1000 and some better quality will measure 2000 volts. Check the specs on the one you are using. You might be surprised to find you already have everything you need. MP
  2. MP1

    grounding problem on sensor circuit

    You need the same ground or you will have different voltage potentials for the two sections of the circuit. Check the voltage difference between the commons. There should be no voltage difference. It should be "Common" to both parts of your circuit. MP
  3. MP1

    Need to design a filter to allow only voice frequencies

    sundar, You did not mention how much attenuation/rejection is needed. If you need to eliminate the frequencies above and below these set points, you will need a high order filter. Neither of these designs are high order. They will give you some attenuation, but not rejection. Will this work for...
  4. MP1

    Low-pass Filter?

    xerex, The 4047 is only giving clock signals of 50 or 60 hz which are complimentary to each other. If you cannot find a 4047, the same could be achieved with a 555 and an inverter chip. MP
  5. MP1

    Voltage controlled filter

    Yes. There are several ways to do this. Voltage control has to be built in as part of the circuit. It is rarely an add-on. In the most basic type of this design, you can use the bandpass section of a state variable filter and use a voltage variable resistance instead of a pot. Can you post the...
  6. MP1

    DIODE QUERY

    I have never seen one of them. I don't mean to take this off-topic, but if you happen to still have one or more of these magazines, it would be amusing to see some of these joke articles. Of course, it should appear as a new topic. MP
  7. MP1

    DIODE QUERY

    sarma, Thanks for the elaboration, but I was actually making a joke based on the old electronics addage that all electronic components have smoke in them and if you let the smoke out, they will stop working... of course, we all know that this is not where the smoke comes from. MP
  8. MP1

    DIODE QUERY

    However......if the diode is in-circuit and powered up when you short it, you run the possibility of letting the smoke out....  ;D MP
  9. MP1

    Audiogurus opinion of inverter

    You are really a paranoid person, talking about secret emails and replacing projects. The inverter project that I corrected was on this site long before you first appeared. It was still on this site when I fixed the lines which were drawn badly by the author. You should seek professional help...
  10. MP1

    Audiogurus opinion of inverter

    Mik3ca, First, you should understand that I did not design this inverter. I only corrected the mistakes in the schematic. There were lines that were crossed and connected, and decimal places wrong in values. They were simple fixes. The design is still the work of the original author. Secondly...
  11. MP1

    Working of invertor - HELP REQUIRED

    Ante, There were some lines connected wrong or crossed and the decimal of the cap and resistor for the clock were off. Very minor fixes. I cleaned it up and uploaded it. As far as the "open forum" questions, no, Projects Q/A is not an open forum. It is reserved for questions and answers to get...
  12. MP1

    Working of invertor - HELP REQUIRED

    Theory discussion regarding inverters has been moved from this thread to the theory forum MP
  13. MP1

    PCB making

    I have used both Lexmark i3 and X1100 series. Just print on best quality black and the transparency looks good. I have actually retired the i3 to the workbench since this model runs the paper straight through without bending it. I hope to get some time to examine it and see if it is possible to...
  14. MP1

    PCB making

    idevices, That used to be the case. I did exactly the same many years ago. However, Inkjet technology has changed. You can use the darkest available setting on a high resolution inkjet and it is much darker than laser printer transparency. I think the problem is not the technology used, but is...
  15. MP1

    Stepper motor driver

    You should post your schematic and board layout if you have it. If you know the specs on the steppers, please also post that. All of this information is needed to properly answer the question that you are asking. MP
  16. MP1

    usb powered device

    As additional information for those who were interested in the serial port information: The Lynx technology transmit and receive chips use 3 Ma typically and actually 1.5 mA on average. Since I would never take up two ports on the computer to run one device, I would look for a low current...
  17. MP1

    usb powered device

    ...of course, the answer is yes. He can certainly use the USB power pins as a power supply. There is no association between the power pins and the data transmission lines. They are just on the same connector so that they can power the device connected. Current limiting with a resistor is a good...
  18. MP1

    transformer problem

    No. It is not. MP
  19. MP1

    usb powered device

    You can actually tap the voltage you need from the serial port unless you need a lot of current. AtMega chips only require micro-amps. It is the additional circuitry that requires additional. Here is a schematic of a 5 volt tap from the serial port. MP
  20. MP1

    popular electronics

    yep....later there was a merger. Then they went out of business altogether. MP
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