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  1. MP1

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

    audioguru, I gave you a mixed variety. Some do and some do not. Look at all the op-amps, not just some of them. One simple use that I have not shown is a simple buffer/follower. I know that you will not be convinced, even with the elaborate explanation that I gave you. It's rather funny, because...
  2. MP1

    Electronic Stethoscope

    ...as soon as CDAK reports his successful changes. Your changes are based upon your theory, which I have seen fail you in other posts. You have not built the circuit, and therefore do not have a grumble in my opinion. MP
  3. MP1

    Ir-remote

    For the discussion on bias voltage to op-amp that was started here, go to: http://www.electronics-lab.com/forum/index.php?board=13;action=display;threadid=906 I have moved it since it is a subject unto itself. MP
  4. MP1

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

    The last post was part of the fron end of a well known Fender Bass amp. The one before that is a well known guitat effect. Here I have added another well tested and favored guitar effect. Although you will see different configurations, you will note from the examples that all op amp uses do not...
  5. MP1

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

    ...and here:
  6. MP1

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

    audioguru, the term "floating input" refers to nothing connected. Any 741 or similar type op-amp will have an input impedance of approximately 2 MegOhms on an input when the other input pin is connected to ground. This would tell most that the input is not floating. You also have a resistance...
  7. MP1

    Electronic Stethoscope

    audioguru, CDAK made the project work without making this list of changes. I hope that we can hear from him soon. MP
  8. MP1

    CAD Program opinions

    Good link for Eagle Tutorial. I will also add two. Anyone got any others? It is nice to have as many sources as possible. http://www.interq.or.jp/japan/se-inoue/e_eagle.htm http://www.precma.com/informatica/tutorial.htm MP
  9. MP1

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

    Op amps have an input impedance of approximately 2 Meg ohms to ground. The input of an op-amp is not floating. This is an application where you want a high input impedance. I have not tried this circuit and I cannot tell you if it functions as is without a little bench work. But if you are...
  10. MP1

    UPS Question..

    Actually, Deep Cycle batteries have their own inherent problems. I would stick with the common less expensive automotive battery if you must use a lead acid battery. LDanielRosa is correct that the automotive battery does not take well to discharge. You should make sure that the battery is kept...
  11. MP1

    Electronic Stethoscope

    shiva, another group member with user name CDAK also made this unit and also had some problems with it. He has made some modifications. I am awaiting the final changes. If you will look through this thread, he describes the changes he has made. MP
  12. MP1

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

    An op-amp does not require an input bias voltage. I see no problem with the circuit "as is". MP
  13. MP1

    knight rider led modifications????

    As audioguru has suggested, you should post the specs for the 12V relays. Also, what are you using for a power source? Right off, I do not see diodes across the relay coils to protect the chip against spiking when the relay activates. It is also not a good idea to connect a chip directly to the...
  14. MP1

    TTL inverters

    Thanks, ante. I saw the link for the inverter chip. I thought you were discussing an inverter schematic which used this chip in it. My mistake. MP
  15. MP1

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

    The red line with a ground marker on the bottom of it which is tied to the power supply low side output indicates that this line is grounded. If he was only indicating where the zener connects, he used the wrong symbol. MP
  16. MP1

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

    ante, 7924 is a negative voltage regulator. Is this what you mean? MP
  17. MP1

    Unknow current in transformer

    Nishi, The other guy that you are agreeing with mis-read the original post. The original post was not about voltage ratio. It was about current. There are formulas for this. Winding resistance has everything to do with current. If you have an unknown transformer, you are going to run a voltage...
  18. MP1

    TTL inverters

    would someone like to post a link or schematic of theTTL inverter you are talking about so that the rest of us can follow? Thanks. MP
  19. MP1

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

    I did not mean to sound critical. I was responding to your above request. It is my opinion that the higher transformer will not work with this circuit because of the current limiting devices used. One example: Q3 and U3 have a critical role in the current limiting circuit (why I pointed you to...
  20. MP1

    Drilling IC holes in a PCB

    My drill is also 30,000 RPM and I have noticed that if the bits are new then it is how you have described. But if you plan on using them a number of times, you will get the walking problem. Even on my CNC I see this problem. Only the walking causes the bit to break. Besides, you are dulling your...
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