Hello -
We have had a lot of break-ins in my neighborhood, and although I do have a home alarm system I'd like to setup a single red LED to blink in the windows, to give a visible cue that I have an alarm system to would-be burglars.
I found this circuit design:
http://pigeonsnest.co.uk/stuff/picprog/single-cell-led-flasher-two-year-battery-life.html
And it appears to fit the bill perfectly for what Im looking for. Few parts, long life, could be built very compactly.
The question I have regards some of the parts listed:
LED Flasher Partlist:
100k resistor (1)
1M resistor (1)
10k resistor (1)
4k7 resistor (1)
1M8 resistor (1)
100 resistor (1)
27k resistor (1)
1u capacitor (1)
100u capacitor (1)
2u2 capacitor (1)
BC557 transistor (1) where can I find this? Or suitable replacement?
ZTX869 transistor (1) http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ZTX869-ND
Is digi-key the best place to get the ZTX869? Looks like I can get 20 of them for about 30 bucks. A little high, but I can live with that.
As for the BC557, it looks like they may not be made anymore? Is there a replacement I can get for this?
I'm a bit of an electronics newb, but I do know a little so I apologize for any beginner questions or mistakes I might make (Ive made my own solar yard lights with a diode, PNP transistor & solarcell & LEDs, but my knowledge doesnt go much beyond that). I appreciate any help/tips you guys can provide. Thanks!!
We have had a lot of break-ins in my neighborhood, and although I do have a home alarm system I'd like to setup a single red LED to blink in the windows, to give a visible cue that I have an alarm system to would-be burglars.
I found this circuit design:
http://pigeonsnest.co.uk/stuff/picprog/single-cell-led-flasher-two-year-battery-life.html
And it appears to fit the bill perfectly for what Im looking for. Few parts, long life, could be built very compactly.
The question I have regards some of the parts listed:
LED Flasher Partlist:
100k resistor (1)
1M resistor (1)
10k resistor (1)
4k7 resistor (1)
1M8 resistor (1)
100 resistor (1)
27k resistor (1)
1u capacitor (1)
100u capacitor (1)
2u2 capacitor (1)
BC557 transistor (1) where can I find this? Or suitable replacement?
ZTX869 transistor (1) http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ZTX869-ND
Is digi-key the best place to get the ZTX869? Looks like I can get 20 of them for about 30 bucks. A little high, but I can live with that.
As for the BC557, it looks like they may not be made anymore? Is there a replacement I can get for this?
I'm a bit of an electronics newb, but I do know a little so I apologize for any beginner questions or mistakes I might make (Ive made my own solar yard lights with a diode, PNP transistor & solarcell & LEDs, but my knowledge doesnt go much beyond that). I appreciate any help/tips you guys can provide. Thanks!!