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  1. Audioguru

    What type li-ion battery use in cordless power tool protected or unprotected

    I answered on the other website.
  2. Audioguru

    Home made battery packs

    The light in the toy also uses battery power. Make the circuit turn it off after a short on time.
  3. Audioguru

    Home made battery packs

    It takes a lot of battery power to activate that antique relay. The last time I used a relay was 50 years ago. A Mosfet for a DC load or a Triac for an AC load activates with a much lower current. The receiver circuit draws 6mA which is high for today.
  4. Audioguru

    Home made battery packs

    Few products today use huge C and D size batteries so if you find a store that has them then the batteries might be many years old. Cheap batteries have very poor quality and are probably 60-years-old-technology "Super Heavy Duty type but marked Alkaline. The Chinese receiver needs 12V, not 9V...
  5. Audioguru

    What music do you like?

    I do not think RAP is music. It is a bunch of pots and pans (as drums) banging in the background and a guy reading a book out loud in the foreground.;
  6. Audioguru

    Cell phone detector circuit

    The circuit in this thread does not work because it was designed or copied by a kid in India who has not learned any electronics yet.
  7. Audioguru

    Heat batteries

    A Lithium battery is sealed and over-charging or over-discharging it is dangerous because the heat produced causes pressure to build up inside it. Then Ka-BOOM!! Why don't you use the battery or its charger to power a heater instead??
  8. Audioguru

    Diy generator

    This Instructable is too dangerous for kids. There is a possibility of electrocution with the high voltages developed with these high voltage motors that are used as generators. Instead, use little batteries in series to double the voltage.
  9. Audioguru

    555 to CD4013: Direct Connection?

    The thread starter's first post here was about a "555". Maybe he does not know about its antique problems and does not know about a Cmos 555. Intersil shows than an old 555 has a 400mA (!) shoot-through current each time it switches and the datasheet for an old 555 says that its decoupling...
  10. Audioguru

    555 to CD4013: Direct Connection?

    Why is the CD4013 not connected to the power supply? Why is the +5V missing a decoupling capacitor? Why are you using an old 555 instead of a new Cmos 555 in the Cmos CD4013 counter circuit?
  11. Audioguru

    555 timer ic problem

    Different input impedance, different minimum supply voltage and different switching speeds.
  12. Audioguru

    555 timer ic problem

    There is a huge difference between an old LM555 and a new Cmos LMC555.
  13. Audioguru

    Mini hi voltage generator dc input or ac input?

    Buy very cheap, get very cheap.
  14. Audioguru

    Mini hi voltage generator dc input or ac input?

    The description of the voltage converter has such a bad translation that it makes no sense. Your video shows the output being shorted which they say is not allowed. Then you have damaged it.
  15. Audioguru

    Replacement LED for Guitar Effects Pedal (Ibanez Tone-Lok CF7)

    It is a good idea to measure the voltage fed to the LED when it should be turned on.
  16. Audioguru

    Replacement LED for Guitar Effects Pedal (Ibanez Tone-Lok CF7)

    You can test the LED with only one of its wires disconnected from the circuit. Heat the solder joint then lean the LED away from it for one wire to be disconnected.
  17. Audioguru

    Replacement LED for Guitar Effects Pedal (Ibanez Tone-Lok CF7)

    Your photo shows it with its switch already set to "diode test". If the diode is "the correct way around" then its anode is the red meter lead and the cathode is its black meter lead. It will show the "forward voltage" of a diode and hopefully for an LED.
  18. Audioguru

    Replacement LED for Guitar Effects Pedal (Ibanez Tone-Lok CF7)

    Why do you think an ordinary red LED cannot replace it? An LED has polarity so it must be connected "the correct way around".
  19. Audioguru

    electro static actuator attempt

    Lots of amps and lots of volts make it extremely inefficient and produce plenty of heat (melt it?). Will it produce enough force to do anything?
  20. Audioguru

    power supply to 1,5v (clock) AND 3v (LED)?

    What color is the LED? I think a tiny little SOT-223 surface-mounted LM317 (plus a couple of ceramic capacitors) can make the 1.5V and a resistor can light the LED.
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