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  1. MP1

    Theory discussion moved from Q/A

    uh....yeah.... I am sure they are just doing that to fool the noobies.... ::) MP
  2. MP1

    A novice in this forum

    Claudio, I have much more trouble with Portugese when I am in Brazil than what you seem to be having with English on this forum. Welcome to the forum! MP
  3. MP1

    How can I make a guitar fuzz effect

    yeah....whatever....  ::) ...guess it was just luck that got me my Engineering degree.... you technicians could teach us a lot. MP
  4. MP1

    How can I make a guitar fuzz effect

    Well, I just got back from a business trip and found your post. No. I am not wrong. Some of the guitar effects which use a 1K input resistor to the op-amp are: Ibanez Graphic EQ MXR Flanger Ross Stereo Delay Ibanez TS9 Tube Screamer Ibanez TS-808 Tube Screamer MXR Hot Tubes Distortion MANY...
  5. MP1

    Knight Rider with Halogen Bulb

    Not always. They are used both ways...which is another example of situations that do not require this resistor. MP
  6. MP1

    How can I make a guitar fuzz effect

    Don't use an LM386 as a pre-amp. It will be too much for your guitar amp. MP
  7. MP1

    How can I make a guitar fuzz effect

    R3 has no direct effect on the impedance of the guitar pickup. The value of R3 is selected to provide two things: 1. amplification with respect to the feedback resistor and 2. Filtering as per calculation with C1. You guys missed the input cap. Jesus and Aaron win the prize with the effect that...
  8. MP1

    How can I make a guitar fuzz effect

    Jesus, There is nothing wrong with the design of your fuzz circuit. In fact, it is an older classic fuzz circuit from the 60s or 70s as I recall. I recommend that you check for mis-connection. Also, I would recommend that you replace the 1N4001 diodes with 1N914. You could even replace these...
  9. MP1

    PROBLEms of LM317

    You just need to make sure your negative lead on the power supply output is 1.2 volts lower than the common connection of the LM317. The output of the power supply does not have to have it's zero potential connected to the "ground" pin of the LM317. Does that help? There are a number of ways to...
  10. MP1

    Knight Rider with Halogen Bulb

    There are many applications where a resistor between base and emitter is not needed on a transistor. "Always" is certainly an exaggeration. Also note, protection from radio waves requires filtering. A resistor does not protect against radio interference. MP
  11. MP1

    Not Gate

    Perhaps this drawing makes it more clear? MP
  12. MP1

    Did anyone information about ...

    Mohammadamirbazr, Please ignore those who want to argue about religion. Have you looked at Atmel AT43USB353M? It might be what you are looking for. MP
  13. MP1

    Led display Digital Voltmeter question

    These are all good tips no matter what project you are working on. Thanks for sharing with everyone. MP
  14. MP1

    parallel port in win 2000

    It is my understanding that allowio is part of porttalk. Just download porttalk. You can find several links through google. MP
  15. MP1

    MOVED: 4W FM transmitter (two transistor)

    This topic has been moved to Circuit/General Requests. http://www.electronics-lab.com/forum/index.php?topic=6263.0
  16. MP1

    checking for proper earth grounding of wall outlets

    There will be no voltage between the third prong (Uninsulated or Green wire) and the return (White Wire). Also, you should have full potential between the Hot (Black Wire) to Return (White Wire) and also see full potential between the Hot (Black Wire) and the Ground (Green or uninsulated Wire)...
  17. MP1

    Moderators only

    I agree. Have you asked Mike about this? I will notify him of this topic. MP
  18. MP1

    PCB Manufactuers!!

    You should post a location since International shipping would not be worth while. MP
  19. MP1

    Voltage Regulator Question

    I assume you are trying to use as little board space as possible? I design with "surface mount" tantalums instead of "through hole" Electrolytics in such a case. Solves many other problems as well. I would not recommend metallic or ceramic caps for power supply bypass. Hope that is helpful. MP
  20. MP1

    Led display Digital Voltmeter question

    Hey gogo, Sorry for the late reply. I was on a business trip in Asia for the week and just got back this morning. Here are the eagle files for both schematic and board. Feel free to make any changes you need. This zip has a parts list for the LEDs used in the design if you would like to use...
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