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  1. MP1

    Electronic Stethoscope

    shiva, what simulation program are you using? MP
  2. MP1

    BCD 74HC390

    Hi geeko, Here is a link to a frequency counter project using this chip. Hope it helps. http://alternatezone.com/electronics/freq.htm MP
  3. MP1

    Connecting Motor makes circuit go loopy

    rpter, This should actually have been posted in the microcontroller area for best responses. Why don't you post your circuit and question there? Just so you know, a PIC cannot source much current. MP
  4. MP1

    Digital radar speedometer

    Actually, I do. I have attached it in PDF format. Good luck with the project! Let us know how you did on it. MP flip_flops_and_momentaries.pdf
  5. MP1

    Programmable Dot Matrix Display System

    Perhaps you would not mind sharing the end result with the community. I am sure there are others here who would also be interested in such a project. MP
  6. MP1

    was Re:Ir-remote Now is: Op Amp discussion

    yes, audioguru, everyone who disagrees with you is me in disguise. Of the 2330 members now on this forum, I hold 2326 of the user names... You will have to guess who the other three true identities are ::) MP
  7. MP1

    digital audio controls

    savage, what problems are you refering to? I can only find two posts regarding the DS1669 and one is saying he cannot get it in his country. Are you only refering to the one post? MP
  8. MP1

    Digital radar speedometer

    ante, Radar is a bit out of my area of knowledge, but it seems like any reflection of the laser would cause you to lose accuracy when the signal bounces back. From the description in the project, it will only be accurate if you are directly in front of the object and it is moving toward you...
  9. MP1

    Programmable Dot Matrix Display System

    If you just want to line the bits up into a parallel port you can use a microcontroller. In this case, you would strip the additional bit in the program and send the data bits to an 8 bit port. MP
  10. MP1

    was Re:Ir-remote Now is: Op Amp discussion

    Wired, welcome to the community. Please feel free to ignore audioguru. We had a similar conversation about Darlingtons. Sorry that you are getting so much opposition from your first two posts. I hope it does not give you a bad taste. MP
  11. MP1

    Digital radar speedometer

    Just a quick look, but it looks like two sets of 7404 setup as oscillators. One is flashing the laser diode and the other is "anded" with the return signal, then this is processed and a calculation is made of the difference. Not much, but hope it helps. MP
  12. MP1

    555 timer help

    I have moved the posts by SOHAIL to the microcontroller area since it was a request for a microcontroller based timer. Please find it here: http://www.electronics-lab.com/forum/index.php?board=10;action=display;threadid=913;start=0 SOHAIL, this will give you better exposure and I hope that you...
  13. MP1

    CAD Program opinions

    I came across this article regarding the use of Microsoft Word for drawing schematics. I was wondering if anyone has heard of this or is using Word for schematic draw. I have attached the article from EDN magazine. MP Schematics_in_MS_Office.pdf
  14. MP1

    usb connection with micro

    There was some discussion of USB in the microprocessor area. It seems to me that you have to pay a licensing fee to develop such hardware. Why not use serial port? MP
  15. MP1

    was Re:Ir-remote Now is: Op Amp discussion

    audioguru, when you add offensive or insulting comments in your posts I will delete them. I am not going to waste my time editing your posts. As an adult, you should be able to handle this concept. But I have seen that you understand this already, since you always re-post with the offensive...
  16. MP1

    0-30 Vdc Stabilized Power Supply

    MonSSter, if you want to build a bipolar supply using LM317, LM337 with 5A, you can use the output of the 317 or 337 to control the base of power transistors. The following post might give you some ideas...
  17. MP1

    Introducing my newbiness :)

    hgb, there is also a projects section on this site. Look for it at the top of the page. There are many circuits in this section and most have explanations of how they work. Welcome and have fun! MP
  18. MP1

    UPS Question..

    Rhonn, VR1 is the adjustment for the charge. This is not the type of regulation normally used with lead acid batteries, though. What are your comments, ante? MP
  19. MP1

    was Re:Ir-remote Now is: Op Amp discussion

    None of them are like the IR project. But several are not using a set of resistors biasing the input of a pin with 2 resistors between V+ and GND as you have described is necessary. Also note that none of them are passing a digital 40 KHZ signal. Biasing an op-amp determines the zero crossing of...
  20. MP1

    UPS Question..

    Can you tell what the charging voltage is? (The regulator cut-off?)You might be ok. If not, you can build a regulator. I would be surprised if this unit did not already have one in it. In this case, you could adjust it if it is not where you want it. MP
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