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  1. MP1

    Electronic Stethoscope

    Why would he want to change anything if it is working? Tomah, I introduce you to audioguru, one who has not built this circuit but has made the statement that the project will not work without his specified changes. I guess he was wrong. MP
  2. MP1

    LM317 Variable power supply

    Have you double checked the pin out of this regulator? It is different than the others. The pin out does not match the schematic symbol. MP
  3. MP1

    0-30 Vdc Stabilized Power Supply

    audioguru, are you building this supply or just using others on this forum to test your theories? MP
  4. MP1

    Grounding circuit

    There is a catch to this, though...years ago all houses had metal pipes all connected together and going into the ground. Many newer homes in some places have plastic water pipes between the faucet and the main pipes. I have seen some with metal braiding on the flexible pipe, but the nut is...
  5. MP1

    Blinking LED

    quantum, when using a mechanical relay, you will charge a coil which will move the switch contact. In a solid state relay this is achieved with LEDs and Phototransistors or a similar solid state type of device. When using microcontrollers, you do not want to source or sink a lot of current, so...
  6. MP1

    inductors and arching

    Switch bounce. The inductor would still allow the voltage to swing negative. It is not directional. MP
  7. MP1

    digital answering machine

    This is very close to your request. It is using the Atmel AT90LS8535. I think the instruction set is the same and you can adapt the pinout. MP
  8. MP1

    low pass filter

    6 db per stage is pretty much the standard. In most cases Q=Fc/BW or BW=Fc/Q, where BW is bandwidth, Q is amplitude and Fc is the cutoff frequency (or center frequency if the filter is band pass). As you can see, you have to give up bandwidth or Q. Cascading several low order stages produces a...
  9. MP1

    LM317 Variable power supply

    Hi Jeff, You should have no problems with this transformer. MP
  10. MP1

    Electronic Stethoscope

    Tomah, Thank you for the confirmation. The project also simulates well in Electronic Workbench as Shiva has told us. It is normal to see more posts from those who need help on a project than from those who have no problems with a project. I really appreciate to hear from those who have success...
  11. MP1

    Simple Circuit Concept

    Probably looking for a RS Latch. Once set, you have to pulse the reset line to change state. There are chips available, or you can build one with gates. Hope it is helpful. MP
  12. MP1

    Servo Throttle Control

    I agree. A stepper will be faster than a window motor. If it is still not quick enough for a punch, you could add an actuator to punch the throttle. mbedford, if visual basic is your language of choice, you are in luck. You can program AVR microcontrollers in a visual basic type IDE. There is a...
  13. MP1

    Blinking LED

    Here is also a PIC based blinking LED project. This one is based on Basic Stamp: http://users.minet.ca/tcumming/public_html_renamed/Electronics/circuits/lightdir.html MP
  14. MP1

    environmental test chambers

    unfortunately, all chambers are built differently. You should try to find the manual for the one you will be using. Mine uses a keypad input where I have several set points with hold times. I can set several different temperature levels and ramp up or down over a specified period of time...
  15. MP1

    Led display Digital Voltmeter question

    Benz, you cannot power any digital voltmeter from the supply you are measuring. You have to provide an unchanging supply voltage to the meter. There are a few ways to do this. Primarily, you will want to pull the supply off the secondary side of the transformer somewhere and not from the...
  16. MP1

    darlington optocoupler

    ginji, I also tried an e-mail to an engineer at TI, but he replied a few minutes ago that TI does not have a replacement for that part and he did not know where you would find one either. Looks like you might have to settle for "close". MP
  17. MP1

    Help please, Need 12 V DC Power Supply for ATX Mainboard

    Here is also a thread at otherpower.com regarding this: http://www.fieldlines.com/story/2004/5/29/104638/719 Here is also an article on using a solar array to power a laptop: http://www.homepower.com/files/laptoppv.pdf MP
  18. MP1

    Help please, Need 12 V DC Power Supply for ATX Mainboard

    Yes, 3.3V is also needed for some. Look at the following link. This might be what you are looking for... http://www.mpegbox.net/ MP
  19. MP1

    What is K/W from heat sinks?

    Capricious, in case you are interested: The Kelvin temperature scale is the base unit of thermodynamic temperature measurement in the International System of measurement. It is defined as 1/ 273.16 of the triple point (equilibrium among the solid, liquid, and gaseous phases) of pure water. The...
  20. MP1

    Capacitor

    There is no substitute for experience in soldering. But until then, you can use a heat sink to be sure ;) Actually, I have been certified in soldering techniques for years and I still use one for fragile parts. Especially for small expensive parts. One example is thermistor beads. So, you...
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