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  1. audioguru2

    Re:how does this add YABBC tags

    Hi Oldratech, To add a picture, I just "attach" it from the file on my hard drive. The file must have the "allowed types" extension, and is limited to 3MB. Click the Browse button, navigate through your hard drive and double-click your file. Your file will be copied to the Attach window, then...
  2. audioguru2

    Our "DC Motors" article

    Who writes that stuff, anyway? According to the article, in the 1st "Common Motor Applications Problems", if you take a tiny little low-torque DC permanent-magnet motor, and use additional batteries in parallel, then its torque will be increased! Oh yeah? Not only that, but in the 2nd Problem...
  3. audioguru2

    Power MOSFETs

    Power MOSFETs have a very low resistance from source to drain when switched on. But they also have a high gate capacitance. They can swich very quickly if their drive charges their gate capacitance fast enough. Is it true that the chip is simply thousands of little MOSFETs connected all in...
  4. audioguru2

    was Re:Ir-remote Now is: Op Amp discussion

    Hotwaterwizard, Our project's receiver has an opamp without an input bias voltage. The receiver will probably be a lot more sensitive if pin3 is biased to half-supply with a couple of 2.2M resistors.
  5. audioguru2

    "Notify of Replies"

    Mixos, I always want notification of replies to my posts. But frequently I get e-mails about replies, then I have to go there to find that the reply was the one that I just finished. Can "notify of replies" exclude my own reply? The "notify of replies" e-mail shows the thread, which is good...
  6. audioguru2

    Re:Transistors discussion

    Ante, Wow, the AD149 brings fond memories. It was the 1st TO3 transistor that I have ever seen! Without wading through Google, I have a Philips 1969 transistor databook beside me (Philips was my 1st job), and that PNP germanium transistor's base-emitter junction did not avalanch (but the...
  7. audioguru2

    "Power?" Inverter

    Hi Guys, Why is this simple multivibrator inverter included in the Projects Section of this high-quality site? It is here: http://www.electronics-lab.com/projects/power/018/index.html The author claims that it will deliver 300W as shown. Has anyone built it? Unfortunately, it has problems: 1)...
  8. audioguru2

    "Cannot Connect", again and again

    Is anyone else having this frequent problem, when I try to get to this site, or posting or going back a page: "Cannot connect to server, connection cannot be established", or "Web site found, waiting for reply", then waiting and waiting. ??????????????
  9. audioguru2

    TV: High Definition, Progressive Scan

    Hi Guys, Now that the American high-definition TV and progressive-scan DVD players are available here (Canada), I need to clear up some misunderstandings: 1) The TVs are still too expensive. Aren't many being purchased? Many DVDs are being rented/sold and I don't think that most are viewed on...
  10. audioguru2

    6 Channel Auto Reverse Sequential Running Lights

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

    Two-way Crossover, Audio Project

    Man! That translation gave me a hard time. The project is here: http://electronics-lab.com/projects/audio/002/index.html If wired as shown, then this project produces a notch filter at the crossover frequency. Due to phase shifts of 2nd order filters that are used, sounds at or near the...
  12. audioguru2

    Batteries Charger & PSU - for Cameras

    Hi Guys, I was wondering, how can this project charge four NI-MH batteries from only 5V in series with a diode, and how can a resistor in series with a voltage source supply "constant current"? The AA size NI-MH batteries that I have charging right now at 150mA, which is less than their...
  13. audioguru2

    Timezone

    I hope that this hasn't been posted before, the Search didn't work this time. The "date and time posted" shows as GMT timezone. Since I am in the Eastern North American timezone then it shows postings sometimes tomorrow and is very confusing. Does this board have a preference-entry for me to let...
  14. audioguru2

    Who is using the oldest computer?

    Hi Guys, Many people say that I should upgrade my computer. But even though it is nearly 10 years old, it does almost everything that I need. It has been downloading reliably for years from the internet at 350KB/s to 1MB/s (thats bytes, not bits like a 56Kb modem) on cable (they say it is...
  15. audioguru2

    Car stereo amplifier output ratings

    Hello all, Looking for a car receiver or amplifier and saw 200W? Well it has 4 channels so each one delivers 50W, right? Maybe, but what kind of watts? If you measure a car battery to be 14.15V when charging, then use it to power an amp that incorporates the very latest low-saturation FETs...
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