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  1. audioguru2

    fm tranismiter

    Hi Prateek, Your FM receiver will receive it clearly but it might be illegal in your country without a licence.
  2. audioguru2

    CMOS power use?

    Cmos doesn't have a fanout spec. Its inputs don't draw any current since they are the inputs to Mosfets. A single ordinary gate can easily drive 50 or more other Cmos inputs and is limited only by the capacitance of the wiring if the speed is high.
  3. audioguru2

    Electronic Stethoscope 2

    Someone will take pics of it and post them. Maybe even 'scope pics and a simulation.
  4. audioguru2

    TELEVISION

    Hi Shahriar, TV high voltage isn't just static. It is about 25,000V at about 100W. It is regulated so while it is zapping you, it boosts its power. If the shock doesn't kill you, when it throws you you might get hurt badly. Many TVs are also dangerous to work on because they don't have power...
  5. audioguru2

    help on voltage amplifier

    Hi Warhorst, I'm glad you found good Instr Amps. They have an excellent common mode rejection of 100dB (100,000), so you probably won't have to worry about it unless your gain is about 90dB (31,000) or more. Your gain is going to be only about 1500.
  6. audioguru2

    help on voltage amplifier

    Hi Warhorst, For your differential amp circuit that uses ordinary opamps you need extremely well matched resistors that are impossible to find. Semiconductor firms make real Instrumentation Amplifier ICs with those well matched resistors inside! They also have accurate gain-determining resistors...
  7. audioguru2

    fm tranismiter

    In Google, enter Stereo Micromitter. The whole Silicon Chip magazine project is linked for free. The project is crystal controlled and very stable. It has 14 station frequencies and one is selected with Dip switches. I designed and built a simpler one recently. It sounds great and doesn't drift...
  8. audioguru2

    Need help for a heartbeat detector!

    Hi Guys, Here's some details about this project:
  9. audioguru2

    CMOS power use?

    Hi Cliff, Cmos draws power only when it is driving something with current (like LEDs), when it is linear (the input Mosfets of your 4093 oscillator) and during switching, or when it is switching at a high frequency (charging and discharging internal and stray capacitance). You could spend weeks...
  10. audioguru2

    detector prototype

    Hi Badai, What are you doing with Eagle? Haven't you seen the project?
  11. audioguru2

    Need help for a heartbeat detector!

    Hi Bird, Here's the entire project with pics and adjustment explanations: http://private.addcom.de/KeithWilson/Projects/hemon.htm Her's a pic from there showing a light-screen and where a finger is placed:
  12. audioguru2

    help on voltage amplifier

    Hi Warhorst, Motorola says the maximum voltage for their MPX10D sensor is 6V that you have. Any more voltage and it produces errors due to self-heating. The typical voltage is only 3V. Its range of output voltage is only 35mV, and its offset voltage is also near that. An ordinary opamp also has...
  13. audioguru2

    Electronic Stethoscope 2

    Who simulated it? Not Doctor Emad, he was too busy making them. Not me, I only fixed the original defective one. I don't have a simulator. Many people made the Electronic Stethoscope 2 project. It needs only 2 small ICs so should be simple to make without any pictures or parts layout. If I...
  14. audioguru2

    Need help for a heartbeat detector!

    Hi Bird, Go and see one at a drugstore (chemist?).
  15. audioguru2

    probe

    Hi Carlton, Put a few turns of insulating tape around a piece of the high voltage wire. Wind 2 or 3 turns of hookup wire around the wire over the tape. You will get about 10V to 20V pulses from the hookup wire.
  16. audioguru2

    Circuit Design Help

    Google has 27,100 articles about "digital to analog converter" and this is just one of them: http://www.play-hookey.com/analog/d2a_converter.html
  17. audioguru2

    detector prototype

    Hi Badai, You are correct, the posivive end of R13 and the positive terminal of the 9V battery connect to pin 4 of the IC. Again you are correct, the grounded components should be connected together to pin 11 and to the negative terminal of the battery. You might put an on-off switch between...
  18. audioguru2

    VGA splitter - cropper

    Hi Nikolas, I should work fine when you send a small high resolution image with the sync you created, to each other monitor that have their resolution reduced to make the picture fill their screen.
  19. audioguru2

    detector prototype

    Hi Badai, On a schematic a BFR 90A looks like any common NPN transistor. On a pcb layout, use its package number and pinout as on its datasheet.
  20. audioguru2

    FM WAVE PROPAGATION

    Hi Prateek, I don't know why there are unused frequencies on your radio bands. My AM and FM dial is full of stations, some with different languages. I am having diffuculty finding a frequency to test the little FM transmitter I built a few days ago.
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