(originally called "two-transistor dual- led flasher.") This is a circuit that's used in RC cars, radio controlled things (if it fits), ETC.......,
it basically is a police light flasher. for some reason i had to re-do this circuit like 3 time or something, but it worked out GREAT!!!!!!!!!
This circuit will work off of a 3v or 6 v battery ONLY! 4.5 or 9.0 volts cannot be used because 9 volts changes the led "flippige", and 4.5 volts speeds it up at a really fast rate.
*NOTE*- this is not my circuit, i got it from Radioshack's electronics learning lab, i do not take any credit for this circuit.-*NOTE*
(but it was fun to build!!!!!)
Step 1: Parts List........
2) 470 OHM Resistors ($1)
2) 100 KOHMS Resistors ($1)
2) 10 uF Capacitors ($1.19)
2) Leds (of any color) ($1.59)
This circuit won't work if either of the PNP transistors are backwards
*NOTE* to change the speed of the flashing, change the capacitor values and the 2 resistor values, not the led resistors though!
Step 2: Schematic-assembaly
I made this on smart draw 2009, sorry for the bad quality.
Step 3: Turn Out.
(if anyone knows a circuit that allows you to time someone?, or a police siren! THANKS!!!!!!!!!!)