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  1. audioguru2

    Remote Controlled on/off, reset and eject for computer

    Its a good idea to use a car remote. Simply use a small piece of wire to replace the clutch or brake switches so that it will think that is safe to "start" your computer. I'm sorry if this is too complicated.
  2. audioguru2

    Its about AC power distribution...

    Thanks, MP, But we are talking about using LED-driven, solid-state triacs here, not mechanical relays.
  3. audioguru2

    RJ45 network card to IR

    I agree with you, Kevin: 1) Why is the IR photodiode FORWARD biased? Most photodiodes are REVERSE biased, so that there is a very small leakage current when dark, but IR radiation causes much more leakage current. An IR photodiode project is here...
  4. audioguru2

    Power Supply +5v with Zener

    Kevin, A zener diode regulates voltage well because it has a LOW dynamic impedance. Therefore if you vary the current through it, the voltage across it won't change much. See the spec sheet for a 1N5231 (I couldn't find one for a 1N5338) 5.1V zener diode here...
  5. audioguru2

    Its about AC power distribution...

    Ante, Good idea! And its not complicated .
  6. audioguru2

    Its about AC power distribution...

    Hi and welcome, Your attachment doesn't show up, I tried once and it didn't work either. It sounds like your project needs a circuit-breaker (disconnects when current is exceeded) with its own reset button, for each outlet. It also sounds like you need these outlets to be powered sequentially...
  7. audioguru2

    6 Channel Auto Reverse Sequential Running Lights

    Congratulations for your win in the contest! And thanks for listening.
  8. audioguru2

    Posts

    Wath out guys, I'm gaining quickly.
  9. audioguru2

    6 Channel Auto Reverse Sequential Running Lights

    Your 4017 pin numbers do not seem to be in the proper order for the lights to be sequential. For example, 4017 pin3 should feed the 1st light, but you have pin1, pin 4 should feed the 3rd light, but you have pin 2 etc. Don't you have them mixed-up? And the diodes? You don't talk about the switch...
  10. audioguru2

    6 Channel Auto Reverse Sequential Running Lights

    On your schematic, I can't see where the diodes connect to. I built a similar Knightrider circuit that uses only LEDs and it clearly shows the diodes: http://www.electronics-lab.com/projects/motor_light/035/index.html Please compare its diodes to yours. Thanks
  11. audioguru2

    6 Channel Auto Reverse Sequential Running Lights

    On the schematic, R3 should connect to the LED anodes, but not to T1 as shown.
  12. audioguru2

    varible voltage, current limiting, power supply

    Rob, You have selected a challenging project, designing a power supply. Many details must be observed, and perhaps you have overlooked this one: The LM317 and its higher current cousins will current-limit when the input-output voltage exceeds 15V. This is for their Safe Operating Area in order...
  13. audioguru2

    Two-way Crossover, Audio Project

    Hotwaterwizard, The notch is very noticeable when you are fairly close to the loudspeaker. But if you are far away in a reverberant room, then reflections partially fill-in the notch, which sounds better. Thanks for your link about the crossover calculator. The car-stereo guys probably use...
  14. audioguru2

    Need help making a headphone amplifier

    Why doesn't your CD player have a headphone jack? I thought that they all have.
  15. audioguru2

    Who is using the oldest computer?

    SleepN2zero9, You are still surfing at 14.4K? If you value your time then you should upgrade. MP, You have quite a quantity of PCs. Yhe last XT that I saw was also an EPROM burner.
  16. audioguru2

    Batteries Charger & PSU - for Cameras

    D. Sandor, Thanks for correcting your schematic on the projects page, which is here: http://www.electronics-lab.com/projects/power/035/index.html But you have also changed the transformer to 15V AC, which will give more than 19V DC. So now there will be more heating, but it has enough voltage to...
  17. audioguru2

    Flasher?

    Hearse, The 4027 will not flip and flop without an oscillator. The oscillator determines the flash rate (number of flashes per second). Since you need an oscillator, you don't need a flip-flop circuit since the oscillator can drive one LED driver, and an inverted oscillator signal can drive the...
  18. audioguru2

    Batteries Charger & PSU - for Cameras

    Dsander, Thank-you for admitting that you missed drawing an important wire on your schematic. So then the 7805 will be a current regulator. I am glad that you realise that the supply voltage is too low for a 7805 current regulator to charge 4 batteries. If you use a 12V AC transformer then you...
  19. audioguru2

    Diodes Diodes and more diodes!

    Junk? No Way! I use the little 1/10W resistors that I can't buy anywhere, that come from fried telephones, answering machines and AM-FM clock radios that I salvage from the curb on each garbage-day following a lighning storm. But I hate surface-mount. When my arms became too short, I showed some...
  20. audioguru2

    Who is using the oldest computer?

    Hotwaterwizard, you're right, the viruses stay away from me. I've never had one and don't run any anti-v software. But I do update and run a little virus-scanning program that I got from my ISP every month. Microsoft won't let me into their Update Center because my IE 4.01 browser is so old (it...
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