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  1. audioguru2

    led lamp

    Of course. The LED uses battery current for the duration it is lighted. When it blinks then it is off for much of the time. In my LED projects I blink the LED for a very short time so the battery lasts for a very long time: http://www.electronics-lab.com/projects/games/003/index.html...
  2. audioguru2

    led lamp

    Hi Iceman, You can't do that! An LED or a bunch in parallel have a 3.3V voltage drop. If you put a 12V battery across them like that then the current will be enormous and either the LEDs will burn out or the battery will be killed. The circuit I posted steps-up the voltage of two AA cells high...
  3. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Sure there is! We found ways to make a really good inverter by discussing these things. It will work exactly like a class-D "digital" amplifier. ;D
  4. audioguru2

    basics of electrical supply

    Yesterday my son touched a 120VAC live wire and felt a small shock even though he wasn't grounded (lucky for him!). I guess some current flowed through his capacitance to ground. He asked, "Why don't the birds get shocked when they perch on a high voltage wire?" I explained that they are small...
  5. audioguru2

    0-30 Vdc Stabilized Power Supply

    Hi Sallala, My Microsoft IE6 browser opens pics using my ACDSee viewing program that shows many file types. See second-breakdown below. What is T3? What happened? (shorted or open) If you have a fuse for the output, it should be inside the negative feedback loop to keep the good voltage...
  6. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    OK guys, Mixos should have a contest. We can combine the last few posts which have all the ingredients to make a powerful, efficient, voltage-regulating pure-sine-wave inverter. Like the Compact Fluorescent Driver, it can even have a ground-fault interrupter built-in. It can use any of the SMPS...
  7. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Hi Sasi, You have a very powerful-looking square-wave inverter with PWM voltage regulation. How many kW? You can see any of Silicon Chip's projects for free if you find them in Google. I entered Silicon Chip Compact Fluorescent and found a link to their whole project for free:
  8. audioguru2

    led lamp

    Which LED lamp circuit? The schematic for this one is posted above.
  9. audioguru2

    LED driving

    UV isn't light, it is radiation at a frequency higher than visible light. It makes things like some laundry detergent "floress" or make their own light. Florescent light tubes have a white phosphor that glows when the UV inside radiates on it. "Black light" bulbs have a black filter to try and...
  10. audioguru2

    led lamp

    Other companies make the 7660 IC. They have their own letters as a prefix like the ICL7660. Look on the web at www.farnell.com who have an Australian site. G'day mate! ;D Yes.
  11. audioguru2

    Electronic Stethoscope

    Hi Duke, Recently, I discovered that the FET in an electret microphone doesn't have a very high output impedance but it is about 4.3k ohms. It is in parallel with the 10k bias/load resistor R1 and results in a total resistance into the opamp of 5.2k. Therefore the gain of U1a is 9.0 and is what...
  12. audioguru2

    LED driving

    Hi Um...Me, You and your suppliers are mixing up technical terms. 90mW is power. 940nm is wavelength which is frequency which is colour. 10m, 20m and 100m could be anything, but not distance. Maybe "red glow" LEDs operate at a high IR frequency close to the frequency of red light. UV LEDs...
  13. audioguru2

    My new project

    Hi Glen, The RG-11 is a phone jack to connect to a serial port on a PC. The company that makes X-10 modules will sell you a book about how to program a pc to control them. They don't provide technical support for your programming. Good luck.
  14. audioguru2

    My new project

    I Googled X10 Theory and got lots of technical stuff. "Theory" is a majic word.
  15. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Hi Alun, You and I don't think it is possible to produce a sine-wave inverter having many voltage steps without wasting a lot of power. I think the only way is by using only 3 voltage steps to get 230VAC RMS out:
  16. audioguru2

    led lamp

  17. audioguru2

    led lamp

    Hi Alun, I looked at a Cmos 555 IC as a voltage doubler, but the loss of two rectifier voltage drops is much too high. Also, Cmos 555 ICs like the one you posted, LMC555 and TLC555 don't have much output current at a supply voltage of only 3V and 2V. The LMC555 and TLC555 are guaranteed to...
  18. audioguru2

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Hi Alun, Of course I know that a PWM class-D amplifier isn't truely digital with 1's and 0's. It isn't truely analog either, it is a switching type. My extremely low distortion sine-wave generator uses varying step heights like MP's idea. It uses a CD4018 Johnson walking ring counter driving 4...
  19. audioguru2

    basics of electrical supply

    If your electrical wiring didn't have a ground, then it might spark all around your house during lightning storms, causing your house to catch on fire.
  20. audioguru2

    MICRO ANTENNAS

    I carry my FM Walkman in my pocket. The cord to its earphones is its antenna. I don't know much about the new microwave satellite music transmissions because they charge a high price for a subscription.
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