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  1. audioguru2

    scalar beamer

    It runs off a little 9V battery? I would think that you would need a coil with thick wire and many turns, in order to modulate the extremely strong field of the magnets. Of course, that coil will need a lot of current, more than a little 9V can provide. What do you think about a power amp to...
  2. audioguru2

    Problem w/ j/k flip flops?

    (slightly off-topic) Man, those were the days. I remember them well. Long ago when I was designing very complicated circuits with transistors, SCRs and relays, then 7400 series, then 74LS00, then CMOS and 74HC00, we still had an ozone layer and no terrorism (but had to watch-out for those...
  3. audioguru2

    Problem w/ j/k flip flops?

    Hi Kevin, Xerxes's circuit doesn't have a decoder connected yet. So his LEDs will simply flash, on-off-on, etc., with each divider flashing at half the speed of the one before it. With a decoder, he can make any sequence that he wants, but I think that he will probably make a sequential chaser...
  4. audioguru2

    scalar beamer

    Hi Steven, A small pot will quickly burn with that high current. Go "high-tech" and use PWM instead. Or simply use the volume control on your power amplifier.
  5. audioguru2

    Improvised movement triggerd switch

    Just be safe when you improvise, and don't use the points and a float in your gas tank! (What if it is a diesel?) But I don't think that it would always go BANG. If the float is set too high, there won't be enough air in the tank for the vapour to burn. Also, if the float is set too low then the...
  6. audioguru2

    scalar beamer

    Hi Steven, The "wire wound thing" is a coil of wire that is wrapped around the magnets to modulate the magnetic field. Try using an oscillator, pulse generator or pink-noise generator with a power amplifier for the modulator, instead of the electric motor with noisy brushes.
  7. audioguru2

    Improvised movement triggerd switch

    Sure, you can even use the points with a float to turn-off a water pump, instead of a micro-switch, or instead of the fuel-level-sensor from the gas tank of your old Holden.
  8. audioguru2

    Problem w/ j/k flip flops?

    Hi again, Xerxes, I lost my 7400-series text book about 25 years ago but I will still try to help you. There are many ways to sequentially light 16 LEDs at only 5Hz, using a 9V battery for power. I don't know why you selected 74LS76 dual JK flip-flops to make your counter when they need a...
  9. audioguru2

    See what I make?

    Hi Ante, Thanks for the movie. What caused that HUGE spark? Hey Steven, Did you see that!!!!!?
  10. audioguru2

    ultrasonic mosquitoes repeller

    Hi Trigger, Welcome to our forum. You've found a product with a very simple circuit. Before you took it apart, did it actually repel mosquitoes?
  11. audioguru2

    scalar beamer

    It sounds like "baloney" to me, and I don't want my wine to get stale while being bombarded with "magnetic pulses", but I'm interested to hear about other proven effects.
  12. audioguru2

    Problem w/ j/k flip flops?

    Hi Xerxes, Welcome to our forum. Your circuit has a few problems: 1) I hope that your "counter" ICs are not SN7476, which operate at 5V, and you are using 9V. An SN74C76 is fine with 9V. 2) You don't have a syncronous counter. Your circuit is called a ripple counter since the clock signal...
  13. audioguru2

    Passive audio filters

    Hi Vainajala, That high-end speaker manufacturer who sold me inductors that were marked with the wrong value and used them in their own speakers, make very expensive speakers with graceful curves and a magnificent finish. They made 4 mistakes: 1) One value of inductors that they make was marked...
  14. audioguru2

    Improvised movement triggerd switch

    he he. Up here, the Fords rust away before they can be scrapped for parts. Before they rust away, their engines seize because they leak so much oil. Their owners say," I parked my Ford in my driveway last night, but now all that's left is a puddle of oil with rust floating on top". he he. How...
  15. audioguru2

    Improvised movement triggerd switch

    Yes Steven, I'm harmless too. The telephone cable repair guy found a very old car part that was burried in my yard. If the world ever came to war then I will keep digging if I need the remainder of that car for my survival. Then we can throw LEDs, resistors and capacitors (charged ones) at the...
  16. audioguru2

    fast switch-off for transistor switch

    Hi Sid, The diode is needed at the emitter to be certain that the transistor turns-off. Without that diode, if the voltage drop of the input diode is less than the voltage drop of the transistor's base-emitter junction, or if the input voltage doesn't reach exactly 0.0V, then the transistor will...
  17. audioguru2

    Passive audio filters

    Hi Vainajala, I use long cables with my desktop computer, and a speaker manufacturer's program that I copied. Speaking about speaker manufacturers: I used a portable octave-band LED real-time-analyser (with built-in pink noise generator) to show the local high-end speaker manufacturer that the...
  18. audioguru2

    Improvised movement triggerd switch

    Hi Steven, Big sparks and explosives? Wow, you're a dangerous guy! ;D
  19. audioguru2

    Help a newbie out!!!!!

    Hi Nest, Do you want to step-up the voltage of your battery? I will add to Harsh's reply with an example: A camera's flash needs a high voltage, but has only a low-voltage battery. You know the whining sound that the camera makes just after one flash but before the next? That sound (not the film...
  20. audioguru2

    fast switch-off for transistor switch

    Hi Vajirkar, Welcome to our forum. Never mind trying to speedup the transistor. It is already over 1000 times faster than a mechanical relay. The protection diode across the relay coil is very important, even though it slows the release of the relay. Without having this diode, the collector of...
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