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  1. C

    Android tablet s Oscilloscope

    Android tablets should support usb on the go powering the oscilloscope, I have a quad 1.4ghz in my tablet so cpu power is barely even an issue It's possible via usb otg.
  2. C

    Battery Voltage Drop

    That or the charger has failed...
  3. C

    Best Speaker To Use As Microphone

    Amplifying the signal then feed it into line in ? What's wrong with a normal mic? The diaphragm should pick up low frequencies as well
  4. C

    If the source voltage is the same as LED voltage, is a resistor necessary?

    There's conflicting Information here.. Does a resistor act as a safety device? Kinda in regard to LED's, one important fact is diodes, leds, zener, etc are all effected by heat, the foward voltage will drop and rise. The resistor simply limits the current (ohms law). The LED's foward voltage...
  5. C

    Help charging lead acid battery

    You need a higher voltage, 14.2v will be fine, then the current draw will be much higher, supplying the voltage at 12v wont do much at all.
  6. C

    HELP - Please Identify This, BUG?

    There's no antenna, and that ic would not have much storage space to record with... Even if it was a spy device disguised as a annoyer circuit... when has a bug ever given it's location away lol
  7. C

    Driving the base of a transistor with the output of a 4017

    Not without maxing out the current from 4017 from each pin
  8. C

    Photoelectric switch help

    It's not faulty.... When you trigger the relay, you need to supply 5v not 12v (most transistors that size handle 6v max on base)
  9. C

    New to electronics, 555 help

    RIP 555
  10. C

    Water damaged projector fixable?

    maybe, some of the components can trap water underneath where it's hard for the water to evaporate totally...
  11. C

    Water damaged projector fixable?

    Chances are there's still water/moisture in hard to reach places, get the washing up liquid out, scrub it all down rinse... and leave out to dry for a few days, or maybe use a hotplate on very low and leave it to dry out... Another way might be to use liquid isopropyl and soak it before drying...
  12. C

    New to electronics, 555 help

    Wired up wrong, but be warned it only takes a few seconds to kill a 555. Picture?
  13. C

    555 timer and speaker

    You need a transistor on the output of pin 3.
  14. C

    basic transistor ckts can produce audio?

    http://www.talkingelectronics.com/projects/200TrCcts/200TrCcts.html
  15. C

    555 timer and speaker

    I've never bothered with a cap in series from a 555 as it should be a clean on/off signal...
  16. C

    Plasma TV turns off

    Maybe there are more bad caps.. But, it sounds like a heat issue and the relay is dropping out.
  17. C

    pir motion sensor

    Not really..... not without modification of the ir sensor/pcb
  18. C

    Testing 555 timers

    A 555 is not the most efficient ic to begin with. Connecting the + and gnd rails should not make it heat up.
  19. C

    How to make my fan spin faster?

    Higher voltage, basically... you could use PWM to vary the speed to suit your needs.
  20. C

    Can anyone tell me what this is called?

    It's a high frequency transformer... You having problems with fluro tubes? They usually drive them in older LCD monitors.
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