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  1. audioguru2

    ElCheapo PSU

    Hi Staigen, He, he. They should never put Whats ratings on audio equipment. ;D ;D If the rectifier diodes have a quick reverse recovery rating, then I don't think they would cause mains buzz. The slow ones are still conducting when they should be shut-off. ??? Maybe it is the opposite. The...
  2. audioguru2

    Sequential Timers with PWM Motor Speed Control

    Hi Ante, Bluetooth would be a perfect way to transfer files between my cell phone and my PC. But I don't think they have it.
  3. audioguru2

    LM78XX & LM79XX questions

    No. The transformer isolates the circuit ground from the mains ground. No. The transformer isolates the circuit ground from the mains ground. If your mains power socket was wired by a drunk electrician, I wouldn't trust it to be wired correctly. Turn off the mains power, take off its cover and...
  4. audioguru2

    Opinion on a brand of solder wire

    I have never seen "no clean" solder.
  5. audioguru2

    Soft start on a 555 timer

    Hi Mr. Heckles, Your transistor doesn't have base current so it won't do anything. Sorry, but I think your idea is backwards. If you look on the datasheet for the 555, its frequency increases when the voltage at its pin5 control pin is low. You might be able to do it with a PNP transistor as...
  6. audioguru2

    ElCheapo PSU

    Hi Staigen, You have a good point! ;D I agree with you.
  7. audioguru2

    Equalizer ...

  8. audioguru2

    ElCheapo PSU

    Don't just use a single wire from the heatsink to the common point of the pcb and assuming that their cases and tabs are properly connected together on the heatsink. Solder each one's common terminal to the pcb or use a separate wire from each one to the pcb.   You might have a small "ground...
  9. audioguru2

    Sequential Timers with PWM Motor Speed Control

    Hi Alun, How do you "do dat"? To post a URL that opens right on this page. If I do the same thing with that video then maybe it will play on this page? Let me try adding its URL on this page: http://www.putfile.com/media.php?n=HydroFoam EDIT: Nope, it didn't work, I guess because I can't find...
  10. audioguru2

    BENCH POWER SUPPLY

    Hi Um...Me, Try the LM317 project with your little heatsink to learn about Volts times Amps. Set it to about 5V output with about a 1A load. When the LM317 trys to dissipate about 26 Watts then it will simply shut-down when it gets too hot. Then try blowing your fan on the little heatsink to see...
  11. audioguru2

    Sequential Timers with PWM Motor Speed Control

    Hi Alun, Where do I find a free hosting service? I'll see if my ISP has it. Electronics-Lab here doesn't allow videos to be posted, and I wouldn't want to cheat by changing the file-name. Your illpostit charges $$$money$$$ for hosting stuff. Did you get the "boat" video to work? It's a blast! ;D
  12. audioguru2

    Equalizer ...

    Yeah, Mukhalled built the "22 Whats per channel amp" in our projects section then had a problem with distortion when he turned up the volume and bass. He learned from me that it really only produces a few watts into 8 ohm speakers and a little more into 4 ohm speakers when using his car battery...
  13. audioguru2

    Equalizer ...

    Hi Mukhalled, Here is a very good article about how to make an equalizer, called a graphic equalizer. The same kind of audio filters can be used to make a real-time-analyser which is also called a graphic analyser. I don't think the author of this graphic equalizer has made a graphic analyser...
  14. audioguru2

    Sequential Timers with PWM Motor Speed Control

    No, that isn't my video. I just looked at it again at its huge "800" size. Maybe hi-speed internet is required to see it since I can't figure out how to download it. Those electric "boats" are pretty cool, aren't they, and their pilots must be experts to control them like that. I can't find my...
  15. audioguru2

    Opinion on a brand of solder wire

    Hi Autir, Thanks for the reminder, I better stock-up on solder with lead in it too. ;D I've never heard of your brand, I guess it is not sold here. I use Ersin (I think it is British) because it works very well and I like its smell. I hate Kester (American) because it stinks and its flux...
  16. audioguru2

    Equalizer ...

    You can purchase an equalizer with built-in real-time-analyser fairly cheaply. They are mass produced by robots. If you make one yourself then about the only thing with a discount for quantity are the LEDs. :(
  17. audioguru2

    supplying power to 12v 1.4a, 3v 3a with a diy power supply

    That multi-output voltage transformer is designed to provide a single output. If you take multiple outputs from it then maybe its primary might be overloaded. 1) 12VAC when rectified and filtered is barely enough input voltage for a 7812 regulator. If the transformer or the mains voltage is a...
  18. audioguru2

    Equalizer ...

    I think he wants us to translate his request. "Diodes" are probably LED arrays that indicate signal strength at the same frequencies as the equalizer, you know, a real-time-analyser. An equalizer plus a real-time-analyser certainly won't be simple. If he made them, then the equalizer would...
  19. audioguru2

    Sequential Timers with PWM Motor Speed Control

    Hi guys, My plane crashed and broke some more since the last time. I ran out of glue so now I am using 5 minutes epoxy. Check out this very long video of an amazing fast electric "boat": http://www.putfile.com/media.php?n=HydroFoam
  20. audioguru2

    BENCH POWER SUPPLY

    1) Transformers all by themselves produce an AC output. An AC-DC adapter has a transformer, a rectifier and a filter capacitor inside to produce a DC output. 2) Use a rectifier bridge with ratings more than needed. More than 30V, more than 2A. 3) The LM317LZ is a tiny thing rated for 100mA. It...
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