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  1. MP1

    2N278

    Thanks! I appreciate the specs. MP
  2. MP1

    Pulse Width Modulation

    sure, it would take some modification for more current. This is stated in the project. However, this is a step in the right direction from the one in the earlier post. So, instead of only pointing out what you feel will not work, have you considered posting a link to the forum of a circuit...
  3. MP1

    REQUIRED PDF FILE ON FREQUENCY MULTIPLIER CKTS&IC'S

    Here are a few links. You were not specific and there are many methods of frequency multiplication for different purposes. You should be more specific as to what you want exactly. http://www.discovercircuits.com/F/freg-multi.htm http://users.otenet.gr/~athsam/frequency_doubler_with_4069.htm...
  4. MP1

    IC HELP: FOR Tx Design

    Not sure if this is what you are looking for since I never design anything in the radio frequency range: MC13175 IC AD6411 IC PBR941 UHF Transistor Hope it is helpful. MP
  5. MP1

    Pulse Width Modulation

    s0225, Here is a little more for you. 12 or 24 volt operation.The complete article is here on this site in our projects section at: http://www.electronics-lab.com/projects/motor_light/003/index.html MP
  6. MP1

    Winding your own Transformer?

    Is anyone on this list building their own transformers? It seems that Jan is a little hard to find these days. Does anyone have some good sources for parts for building the transformers? I would like to find some good sources as I am now in a project that will require a specific transformer that...
  7. MP1

    lcd

    vedran, I am sure I have one here that I can send if you do not mind paying the postage and any other fees that might come up. Please send me the details in a private message. Just so you are aware, the last package I shipped via Internatioanl standard postal service took 4 to 6 weeks to get to...
  8. MP1

    Problems with opamp circuit

    Wellington, what audioguru did not explain is that your pin out of the LM386 is wrong on your schematic. Pin 8 is not a ground pin as your schematic shows. It is for gain. I would guess that you used the correct pin out on your first circuit and used this pin out on your second circuit. You...
  9. MP1

    Our "DC Motors" article

    whatever. ::) Don't read them. MP
  10. MP1

    Problems with opamp circuit

    Wellington, since the first circuit works, you can quit trying to redesign it in your head. Besides, the LM386 is not an opamp. It is a power Amp. I would look for a mis-wired component or possibly you swapped some components. This is easy to do. If you have checked and you are sure that nothing...
  11. MP1

    Winding your own Transformer?

    Kevin, You do not have to guess. http://www.electronics-lab.com/articles/transformers/xformer3.htm MP
  12. MP1

    Led display Digital Voltmeter question

    This has already been answered here on the site. You just need to search. It was either in the digital voltmeter discussion or it was in the 0-30 Volt Power Supply discussions. I recall seeing a diagram posted to use the digital voltmeter for both volts and amps. If you cannot find it, let us...
  13. MP1

    2N278

    Looking for data sheet for a 2N278 or equivalent transistor. I searched National and it would not come up. I think it is actually considered a Delco part. It is a PNP power Transistor. Thanks, MP
  14. MP1

    Free sample chips!

    There is a company named "small parts" in the US that gives (or used to give) free samples of small gears, etc. For motors, I would also like to know where to get free samples. I have not heard of it. MP
  15. MP1

    Our "DC Motors" article

    1. Torque is directly proportional to current. 2. If you take the strain off a motor, it will move faster. 3. A gear train will not change current requirement. It will only shift the load. 4. Look at the torque/power formulas for motors. I have read the article. There is nothing wrong in it. MP
  16. MP1

    DIO Protection

    Why don't you use an MOV, which are used to protect against voltage spikes and lightning strikes? Another alternative would be to use a resistor and a zener. MP
  17. MP1

    Latch triggering

    Skimping on the voltage will put it in the unknown region. How have you handled switch bounce? Perhaps you are seeing some switch bounce when it seems very sensitive. MP
  18. MP1

    Our "DC Motors" article

    I think it is the way you read these things. I see nothing wrong in this article. If your motor is drawing too much current, then it is slowed down. When you add the gear train, it does speed up the motor because of the shift of the load. Again, if you do not have enough current, then adding an...
  19. MP1

    Our "DC Motors" article

    George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta, Georgia 30332-0405 I see nothing strange about this article. It reads like a basic textbook "motors 101" course. Sorry you do not agree with it, but it is a good article. MP
  20. MP1

    3-Axis Stepper Controller

    Most production shops use a light oil for cooling and not water since water will cause the parts to rust. However, the answer is yes. You can use one of the switches to be activated whenever the position is not at home. When the switch is activated, you could use this signal from the switch to...
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