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the out put wave form will have about 24 V peak, so in series will do. and he intended doing this with 1.5 v battery, so i tried to boost the voltage (like in a joule thief)Also note that magnatro's schematic shows the LEDs wired in series - you would need to wire them in parallel.
Andrew
yeah, that's right.. but when i designed this, i designed it in parts. and that was a mistake of me connecting the Vcc and reset pin.Do bear in mind that this will have the fraction of the power of a regular camera flash.
50 of those white LEDs have a combined input power of about 3.5W (not including resistor losses). A typical camera flash has an input of around 45w per flash. I think you'll find that while quite bright, those LEDs would not light a room to the same degree, or to the same effect (LEDs are much more directional), as a xenon flash.
Also note that magnatro's schematic shows the LEDs wired in series - you would need to wire them in parallel.
Also for the LEDs you have chosen, you will need a 12v supply.
- Pin 4 of the second 555 must be high for it to work - the best way to do this is connect it straight to pin 3 of the first, then connect pin 8 of the second to V+. With pin4 floating, the circuit won't work.
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Andrew
'you activate a switch (needs to be off when pressed, up when on) and this then sets off either a 5 second or 10 second timer, Simultaniously it also charges a camera flash capacitor. After 5/10 seconds the timer fires the flash along with a buzzer. After the flash and buzzer have sounded it needs to switch off until you press a reset button.'
That sounds to me like two monostables would be needed - one for the delay, then that activates the second monostable which sends a brief pulse of power to flash the LED and buzzer.