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  1. audioguru2

    Help needed selecting a chip for my project

    Ante, That's nice, then James can see the display blinking to the pulses. But you don't know if the receiver can give enough power output. C, H and L? How about 2, 3 and 4?
  2. audioguru2

    isolated motor feedback circuit

    Bob, Most DC motors stall with a HUGE current, just measure its resistance then use Ohm's Law. Isn't that why your circuit has current-limiting? So maybe you need just a decision: a) No current. The motor has burned-out. or b) Normal current. All is well. or c) Current-limit. The motor...
  3. audioguru2

    detector prototype

    Badai, You can build an EMI detector to prove to your crazy lecturer that only OPERATING appliances emit EMI, and maybe get bonus marks (or get expelled). You need a very-low-frequency AM receiver circuit. A normal AM broadcast band receiver will pick-up a bit of EMI when tuned to a quiet spot...
  4. audioguru2

    Generators

    Steven, Are they in parallel or in series? Since you like loud bangs then BE VERY CAREFUL and try powering-up a big electrolytic 1000uF/100V connected backwards to a high-current supply. If you are not injured too badly and can still hear, then you'll be cleaning it up for months.
  5. audioguru2

    Who is using the oldest computer?

    Kasamiko, I think that you will find that your 3Kb to 6Kb is actually 3KB to 6KB, which is a mistake that I made when I replaced my built-in 14.4K modem with the 56K one. Windows gets the "b" and the "B" mixed-up sometimes. 1Kb in 15 minutes calculates to about 1.1Kb/sec, which does not agree...
  6. audioguru2

    Generators

    Steven, If all those capacitors are in parallel, instead of in series, then the "POP" sound is from them breaking-down, before you short them. Do you expect to have more than 14,490 volts (23 X 630)?
  7. audioguru2

    8 SOIC to DIP adapter

    Yes, look at how neat and tidy his soldering is. He must have good eyes (or magnifying glass), steady hands and a small-tipped iron, or a tiny helper with those gifts.
  8. audioguru2

    Question on the Plants Watering Watcher circuit

    Ante, Didn't you see my post?: Why re-invent a new circuit when this one will work fine with the addition of only ONE capacitor? For JLB and others who build this project, and want it to work at all with new batteries, or to have it continue functioning when its batteries are running down, and...
  9. audioguru2

    Light Switch

    Siddharth, You can't use a regulator as an on-off switch. It operates exactly the way that I said: With the base of the transistor high, then the regulator is floating and therefore will be a piece of wire from its input (15V) to its output, as in my quote #2 above. "The lights will be bright"...
  10. audioguru2

    Who is using the oldest computer?

    Kasamiko, Actually, my 486 runs on twisted rubber bands! Yes, on cable I'm getting 1MB/sec, and the router for my LAN doesn't seem to slow it down, and even faster by using download-accelerator software. A 1MB PDF-file (nearly 200 pages) downloads so quickly that I can't read the speed on the...
  11. audioguru2

    Question on the Plants Watering Watcher circuit

    The point of this discussion is not about the LED brightening (dimming in reverse) when the soil gets drier and drier, as the project's description says that it will. When looking at the LED today, can you determine whether its brightness is more than it was yesterday (I noticed that the LED was...
  12. audioguru2

    "Notify of Replies"

    Mixos, thanks. I will double-check the index page when notified (since I am sent to it anyway) to see if it reports me as making the last post in that whole index. Perhaps you misunderstood my 2nd concern: Having the e-mail notification linking directly to the last-posted message of a thread...
  13. 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...
  14. audioguru2

    "Cannot Connect", again and again

    Mixos I just now got that same error, twice. It has more information for you: Warning: file(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /home/electronics-lab.com/www/footer/linkman_0.php on line 30 Warning...
  15. audioguru2

    "Cannot Connect", again and again

    Mixos, Thanks for fixing the Fatal Error. Now (last 24 hours) I am getting this new error each hour: An Error Has Occurred! 2: file(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution (/home/electronics-lab.com/www/footer/linkman_0.php ln 30)
  16. audioguru2

    Question on the Plants Watering Watcher circuit

    Do we have ANY projects that work properly? (2 inverters, 30V power supply, stethoscope, IR detector, 6-channel disco lights, batteries charger, roadrunner, etc. and now this one). The authors of the above claimed that their circuit works. I had fixes for them all.
  17. audioguru2

    Question on the Plants Watering Watcher circuit

    Ante, JLB's constructed project does not work and he believes (as I do) that the circuit cannot dim its LED. If the dimmer knob for your car's dashboard didn't work, wouldn't you complain and wonder why-not? Your eyes' response to light is the same as your ears' response to sound: Logarithmic...
  18. audioguru2

    Who is using the oldest computer?

    ZomBiE, Your Commodore still works, great!
  19. audioguru2

    attenuator cord for taping off a scanner

    This attenuator reduces the speaker or earphone level from the scanner to the microphone level of the recorder. Use shielded cable.
  20. audioguru2

    Question on the Plants Watering Watcher circuit

    Designing another circuit? No. Just add one capacitor. That will fix JLB's complaint. Replacing several other components? No, the opposite. After replacing IC1, eliminate D1 and R2. Replacing the main IC? Why not? Most of the original ICs don't work with new batteries and they all won't work...
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