Search found 2 matches

by max
Sat Nov 23, 2002 5:45 pm
Forum: General Discussion
Topic: Question on which LED to use
Replies: 2
Views: 987

Question on which LED to use

Ive chosse to use a 12 vdc relay run buy a wall wort, now to keep this a small package Id like to run the led and or pizzo buzzer from a 9 vdc battery. And what if I could put a 555 chip in it to make the buzzer and or light flash on and off. Anyone got any suggestions on which led to use and how to...
by max
Fri Nov 22, 2002 4:55 am
Forum: General Discussion
Topic: ac grid sensor needed
Replies: 3
Views: 1527

ac grid sensor needed

I need to build a small circuit to sense my 110 grid power. I want to know when the power goes out. The circuit should sense 110 ac and when no ac is present open another circuit dc (9vdc) and light up a bright led light and another circuit seperate to run dc to a pizzo buzzer to alert me so I can t...