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  1. BobK

    Op Amps

    Not if you exceeded the GBP. Bob
  2. BobK

    ultra miniature am radio

    Great. To make it smaller, I would use and IC audio amp instead of discrete transistors. Bob
  3. BobK

    ultra miniature am radio

    http://www.vk2zay.net/article/116 Bob
  4. BobK

    Op Amps

    Off the top of my head: Oscillators (sawtooth, square wave, sine wave) Audio preamp Active filters Tone controls Scaling and offsetting a voltage Constant current sources Voltage regulators Voltage to current / current to voltage converters Schmitt trigger Ideal rectifier Ramp generator Driver...
  5. BobK

    Converter Circuit

    The next question is why you are trying to use an inappropriate meter for the signal that you have? Burning perhaps 100W of power to make a measurement seems quite ridiculous. Bob
  6. BobK

    DC-DC Converter

    On the other hand, be aware that the peak input current will be higher than the output current. Bob
  7. BobK

    What exactly Is voltage drop and how Is It detected?

    Maybe this will help. Think of holding a bowing ball above your head. It has a lot of potential energy. If you drop it, it will do a lot of damage (work). Now lower it to 1 inch off the floor. It now has much less potential to do work (damage) if dropped. This is just what happens to...
  8. BobK

    Wanting to use a new microcontroller with Arduino software

    There are bootloaders available for PICs, for free even. But that will not allow you to use Arduino software, it will only allow you to download a new PIC program over USB or serial. Bob
  9. BobK

    Motor to drive closed loop drawstring for blinds

    You can buy gear motors. Torque is the product of a radius and a weight. If you need 8 pounds of force on a pulley 1/2 inch radius pulley, that would be a torque of 4 inch pounds. Bob
  10. BobK

    Looking for assistance - Please help

    For an off the shelf solution, a Raspberry Pi + a load cell should do it. The rest is programming. Bob
  11. BobK

    Car USB charger problems

    When the car is running it is more like 14V. Bob
  12. BobK

    What am I not getting about LED's

    I am sorry, but you do not understand series and parallel circuits if you could make the statement in the first quote. My conclusion is that you had confused them. I was wrong. The correct conclusion was that you gave us incorrect information in the OP. I also prefaced my post with "If it...
  13. BobK

    What am I not getting about LED's

    If it is working like that, you are not putting them in series, you are putting them in parallel. Series means connect the cathode of one to the anode of the other, and then connect the other cathode and anode just like that of a single LED. And by the way, if you measured the current by...
  14. BobK

    Reducing the Voltage to a square root of itself

    You could use a log amp, divide by 2 then an exponential amp. Bob
  15. BobK

    555's are terrible, no they're not, yes they are, no they're not

    Hey, I am a hobbyist hacker and I made a servo controller with a 555 30 years ago, when I knew practically nothing, and it I designed it myself, and it worked. It would have been a stretch for me at that time to do it any other way. Now, however, almost anything that could use a 555, I would...
  16. BobK

    design circuit

    Waveform? Why are you so stingy with information? That is not the way to get help. Bob
  17. BobK

    circuit simulation software

    Well, LTspice will plot voltage at any net or current into any node, so that is much like an oscilliscope or multimeter. I reccomend it as well. Bob
  18. BobK

    design circuit

    3V is a constant DC value and has no frequency. Did you mean that you wish to output some AC waveform at 3V p-p or RMS? Bob
  19. BobK

    Motor limit switch circuit?

    I need to build one of those! Bob
  20. BobK

    Which PicBasic Software To Use?

    My day job is working on a C/C++ compiler, so it doesn't look so unnatural to me! C, that is, I think C++ is pretty much evil, and by far prefer Java for object oriented programming. Our compiler team allows only limited use of C++, because we know better. Bob
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