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  1. Hero999

    BLINKING LEDS help!!!

    It depends on the 9V battery, a little PP3 battery isn't large enough to provide enough power for very long.
  2. Hero999

    manifesting inductor behaviour

    All I can say is do your own homework. The simplest way is to see the waveform is simulate it using LTSpice otherwise build it, although the latter isn't possible as there will be some resistance in the circuit.
  3. Hero999

    Need datasheet for ali M3501 and ---

    Care to provide more information? What do they look like? Do you have a picture? My guess is they're power transistors, just replace the M with 2N and Google, see example linked below...
  4. Hero999

    timer to trigger latch

    So why not just buy it? If you spent the amount of time you've spent trying to come up with an inferior design yourself working you'd have the money to buy it by now. Anyway for educational purposes I'll take a look at what you want. So you need the output to go high after 15 seconds from...
  5. Hero999

    Powering a Canon A470?

    THey don't, you have to build your own by connecting two in series. Fortunately you can buy dual D cell holders. I don't know, 3.6V might be too much, and if you're talking about a Li-ion cell which is 4.2V when fully charges, then it almost certainly is. The only way to know for sure is to seek...
  6. Hero999

    Powering a Canon A470?

    You need a DC-DC converter to get 3V from the higher input voltage. Have you measured the current drain of the camera? If it drains two AAs in 2 hours 1A is probably a good estimate but the peak current demand could be higher. Perhaps you should use a couple of D cells instead? It should last...
  7. Hero999

    BLINKING LEDS help!!!

    Why have you got a battery with the voltage set to 0V wired in series with a 24V battery? The intensity of the LEDs is not the same because the current flowing through them is different. Google for the formula to calculate the series resistor for the forward current you desire. The 555 timer...
  8. Hero999

    Advice Needed for Switching ~1000W Voltage Sources to Inverter

    Assuming the minimum operating voltage is 10V and the current is 100A, the 93,000
  9. Hero999

    Need Help for this simple Relay Driver Circuit

    Why are you using a transformer, rectifier and capacitor to power a 6V relay? It's a silly idea, get rid of the transformer and use a relay with a 240VAC coil.
  10. Hero999

    Where do i go?

    You haven't provided enough information such as voltage, temperature, contract duration, deadlines and cost.
  11. Hero999

    Need Suggestion for replacing Capacitors

    The capacitor doesn't actually increase the voltage, it just allows current through the filaments which heats them up to help initiate the discharge. Once the arc has struck the voltage and frequency falls (the Royer converter circuit normally used to power fluorescent tubes will produce a...
  12. Hero999

    what is the purpose of Up/Down Digital Counter

    You can asnwer that yourself, if you actually bother to read the description on the website.
  13. Hero999

    which resistors are used in stopwatch circuit?

    What do you mean? If you can't read the part numbers use your browser's zoom function..
  14. Hero999

    simple voltage detect - wide range

    Then that's easyly done with a constant current source powering the LED from the high voltage side.
  15. Hero999

    which resistors are used in stopwatch circuit?

    It's a really badly drawn circuit which shows ICs as DIPs and resistors with colour codes rather than the propper symbols. The resistor values can be deturmined by reading the colour code which can be found using Google.
  16. Hero999

    simple voltage detect - wide range

    It's still not clear what you want to do. Do you simply want to detect the presence of a voltage or do you want to measure the actual voltage? Just Google for constant current source if you don't know what it is. I was suggesting building one from transistors to limit the current through the...
  17. Hero999

    simple voltage detect - wide range

    You should use a constant current source rather than a load of relays, that way there's not need to switch ranges.
  18. Hero999

    BLINKING LEDS help!!!

    I don't have Livewire so I can't view the schematic. You'll get more help if you post the schematic in a format which everyone can read.
  19. Hero999

    Carnival wheel with LEDs

    How good is your programming? You need to use a microcontroller. That's what the Velleman kit uses anyway, except it's already comes programmed for you. That kit has very little educational value apart from soldering practice. You'll learn nothing about electronics by assembling it. Children...
  20. Hero999

    Replacement for 2sk1058

    Care to post the schematic? It's a power transistor which is totally overkill for a preamplifier and might have too higher gate capacitance anyway. You can probably use a small signal transistor such as the 2N7000 but without seeing the schematic, I can't be sure.
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