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  1. audioguru2

    New Server

    Hi Guys, Our new server or our site seems to breakdown for many hours every day. "Cannot find server, DNS error" or "Web site found, waiting for reply". It is very frustrating! When it works it's great! Compounding the problem is that the home page's "Recent Topics Details" doesn't work. So...
  2. audioguru2

    Re: Alun's low voltage alarm

    Hi Alun, I'm glad that you are learning here. 8) You have a very good idea to use the sagging supply voltage to help with hysteresis. I keep thinking of circuits with a regulated supply, but this application uses a non-regulated battery supply. Circuits with slowly changing inputs that use...
  3. audioguru2

    Low Voltage Alarm?

    Hi Guys, Here is a little test for you with a circuit that I found and it might even be one of our projects. What is wrong with it? Here is the project: http://www.aaroncake.net/circuits/lowvolt.htm Here is its schematic:
  4. audioguru2

    Our Site Doesn't Open

    Lately I have had great difficulty getting into our site's home page, projects page or even replying to replies. I notice that in the last 24 hours only 15 posts have been made, so I guess I am not the only one. My browser tells me that it cannot find the server, that it found the server and is...
  5. audioguru2

    Posting Instructions

    I am receiving instant messages from newbies asking about the very basics of how to post. I had the same problem when I joined our forum and still don't know all the details. Does anyone have detailed instructions including all the YABBC tags? Thanks ???
  6. audioguru2

    MOVED: Microcontrollers

    This post is moved to the Microcontrollers forum. http://www.electronics-lab.com/forum/index.php?board=10;action=display;threadid=2599
  7. audioguru2

    6V Ultra-Bright Chaser

    Hi Guys, I have been making a bunch of this project: http://www.electronics-lab.com/projects/games/004/index.html hasn't anyone else? I have also been converting all my 3V chasers into this circuit, modified for 3V as in the project's text, they look more interesting and their battery lasts...
  8. audioguru2

    Site's Clock

    Hi Mixos, Thanks for fixing the internet problems on your wonderful site. I have a small request for you, if you have a little spare time. That's it! The time. The site's clock is about 20 minutes fast, so i receive e-mails about replies that my clock says haven't even occured yet. Thanks...
  9. audioguru2

    Plants Watering Watcher-2 project

    Hi Guys, Update: The project is here: http://www.electronics-lab.com/projects/science/018/index.html The AAA alkaline battery cells on the first two units that I made more than 5 months ago have dropped below 1.0V each. The units were still flashing brightly. The batteries didn't last as long...
  10. audioguru2

    Re-called Light Bulbs

    Hi Guys, A local light bulb importer is re-calling millions of Chinese-made compact-flourescent light bulbs. Apparently, many are failing and although are properly made with fire-extingueshing plastic, they melt all over the place! Ouch if you're under one! Adding to the problem is that the...
  11. audioguru2

    3V LED Chaser project

    Hi Guys, The project is here: http://www.electronics-lab.com/projects/games/003/index.html I have a pic of my Veroboard layout. It has 47 (!) trace cuts which takes my drill-press about 2 minutes to do. It has 21 jumpers, a few under the ICs, that takes me abut half an hour to cut, bend and...
  12. audioguru2

    Re-chargeable Batteries

    Hi Guys, I have been shopping for high-capacity Ni-Mh re-chargeable batteries. I know that the AA cells have a capacity that is about 4.4 times what the old Ni-Cads had, but I need more. In the good old days, a D cell Ni-Cad had 8 times the capacity of an AA cell. So I thought that a D cell...
  13. audioguru2

    60W Linear Amplifier

    Nice new project. http://www.electronics-lab.com/projects/rf/027/index.html Sorry, but I am not a ham radio operator and are just curious. Others will be curious too. What frequency or band does this amplifier operate at? Are its output power and harmonics legal?
  14. audioguru2

    Extra Parts

    Hi Guys, In another post we have discussed that components of a project are not needed but someone disagreed. This circuit consists of 741 opamps U2 to U4. U3 is "supposed" to buffer the output of U2 from the loading effect of R11 which is 2.5K. R9 is "supposed" to limit the current from the...
  15. audioguru2

    Low-pass Filter?

    Hi Guys, In another post we have discussed why this part of a project doesn't work as a low-pass filter that is described in the project's text, and produces severe distortion and noise. The original part of the schematic is on the left side, and I re-drew it on the right side to make it easier...
  16. audioguru2

    Opamp or Power Amp?

    Hi Guys, In another post we have discussed why this part of a project doesn't work at all, or produces severe distortion and noise. This audio amplifier's input is near line level, and its output load is an earphone, 8 ohms or more, from a cell phone, home stereo or Walkman. Why doesn't this...
  17. audioguru2

    Car subwoofer and amplifier

    Hi Guys, My son just got a subwoofer and amplifier from E-Bay. We installed it with 4 paralleled 20A fuses! The amp is 350W RMS. I kept telling him to turn it down for proper balance but he likes it so that the bass kicks you really hard. My clothes were shaking with the beat! It is so loud that...
  18. audioguru2

    REALLY High Voltage Arcs

    Hi All, Ante posted one before, but here is a link to pics and movies of high voltage disconnecting arcs and other disasters. They have detailed descriptions: http://205.243.100.155/frames/longarc.htm#Disconnect
  19. audioguru2

    Pulse Width Modulation DC Motor Control

    Hello, I have been researching circuits for PWM speed control of DC motors and found our project here: http://www.electronics-lab.com/projects/motor_light/033/index.html Has anybody tried it? What does it do? It appears to be a simple adjustable-frequency "Classic" 2-inverter CMOS oscillator...
  20. audioguru2

    New, Nite Rider lights, Project

    Hi Guys, Nice new project. Lotsa ICs. This project is here: http://www.electronics-lab.com/projects/automotive/011/index.html Automotive catagory? No wonder I couldn't find it. For those of you who build this project, I recommend adding a capacitor across the power supply, and replacing the 555...
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