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  1. MP1

    Making PCBs with magazine's paper

    Billy, that is a very clean looking board from press-n-peel. I tried this method when it first came out and it was not very good. It appears that it is working much better than what it used to. Nice board! MP
  2. MP1

    LM317 Variable power supply

    Jandro, Did you find a solution? MP
  3. MP1

    Who is using the oldest computer?

    I used to have an old Texas Instruments computer that had no storage such as hard drive. Everytime you wanted to run a program, you had to write it, then compile it and run it. It was a TI-99A. Ever seen one of these? MP
  4. MP1

    Who is using the oldest computer?

    I have several different vintages myself. A couple of XTs, one 286/20 MHZ, a 386/40 MHZ, a 486 not in use as it is too troublesome, one 586/133MHZ, which came out just before the Pentium, a Pentium 200MHZ,then I have the P2/300MHZ, P3/450 MHZ and the one I use the most is a P4/3 GHZ. The XTs are...
  5. MP1

    Power Supply +5v with Zener

    1N5338 is a 5.1 Volt Zener rated at 5 Watt. (5 volts X 1 Amp = 5 Watts) You have to go with 5.1 or 4.7 volts. You cannot get 5 volt exactly. Also, note that this has a 5% tolerance. You will have better current availability if you use the zener to control the base of a power transistor. (in...
  6. MP1

    ttl or gate

    ...except with this TTL circuit you are not worried about slew rate as the response time is only dependent upon the response of this transistor at saturation. This is plenty fast enough for TTL switching. MP
  7. MP1

    Impedance matching

    You will also have to provide the gauge of the wire to determine the resistance. Resistance can be determined with these two known values (thickness or gauge and length). MP
  8. MP1

    Remote Controlled Lawn Mower

    I think any kind of remote controlled device is pretty cool. If you can make it self powered without the cord, that is even better. MP
  9. MP1

    Smart card PC emulator

    You should post a link to the project in your post so that we do not need to leave the forum to go look. Otherwise, we will have to log back on and find your post again. MP
  10. MP1

    Flasher?

    http://www.cadsoftusa.com/ You can download the free version. It will output to a graphic image file. MP
  11. MP1

    LED Flasher (very Interesting.............)

    yourwins, the article mentions the knight rider lights, so I would assume that it is what you want. In a little more searching I find there is also a knight rider circuit on our site: http://www.electronics-lab.com/projects/motor_light/035/index.html Then also here...
  12. MP1

    Convert 0-30V 3A PSU to 5A or more

    Yes, ante brings up a good point. A good addition would be an isolation transformer. A 1:1 transformer or a similar circuit that would not change your voltage but which would guarantee that you are isolated from the mains. This isolation might even help with the problem you are seeing, depending...
  13. MP1

    Capacitor variety

    Here is a link I have found regarding making your own capacitor. All done on a breadboard. It is very introductory but causes one to form other ideas as well. Have fun! http://www.doctronics.co.uk/owncap.htm MP
  14. MP1

    0-30 Vdc Stabilized Power Supply

    Ian, newbie questions are always welcome. MP
  15. MP1

    0-30 Vdc Stabilized Power Supply

    Ian, do you really need this old technology? Mixos has posted a diagram of the current meter and voltmeter connection on page 2 of this post. This is with the 7107 IC, which will give you a much better digital display. Just a suggestion. MP
  16. MP1

    Remote Controlled Lawn Mower

    John, I am sitting here chuckling as I visualize the mower running over the power cord... ;D Oddly enough, most people have this problem with an electric push mower while they are pushing it. Perhaps we will see some ideas for the remote control version. Is it a gas mower or electric? A gas...
  17. MP1

    Lasersound

    saileshkrishna, in fiber optics many signals are multiplexed together then sorted out at the other end by a few different methods. One method is digitizing the signal and demultiplexing at the other end. Another method is to use different color filters at the other end to separate the different...
  18. MP1

    LED Flasher (very Interesting.............)

    It is here: http://www.aaroncake.net/circuits/chaser.htm MP ;D
  19. MP1

    produce electricity using quartz cristals...

    Hi ante. To add to this: Yes, this is mostly dependent upon the voltage available. (but of course voltage does not move without current) As we see in a solar panel charging a 12 VDC car battery, there is not much current coming from the solar panel, but the voltage is normally around 20 VDC when...
  20. MP1

    about "25w mosfet audio ampfilier"

    There are many reasons you might have noise. Do you have the schematic? Sometimes a picture of the circuit is also useful. MP
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