Search found 2 matches
- Sat Nov 23, 2002 5:45 pm
- Forum: General Discussion
- Topic: Question on which LED to use
- Replies: 2
- Views: 1884
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...
- Fri Nov 22, 2002 4:55 am
- Forum: General Discussion
- Topic: ac grid sensor needed
- Replies: 3
- Views: 2782
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...