??? 02/13/06 13:33 Read: times |
#109834 - Opto with capacitor Responding to: ???'s previous message |
You can use a capacitor as an impedance to control the current into an opto-isolator. It doesn't dissipate any power as it's a reactive impedance. 100 to 220 nF is a suitable range. Remember to put a reverse diode in parallel with the opto LED or to feed the LED through a bridge rectifier because otherwise you will blow it up. |
Topic | Author | Date |
monitoring mains voltage | 01/01/70 00:00 | |
Opto with capacitor | 01/01/70 00:00 | |
re opto with cap | 01/01/70 00:00 | |
Some protective components required | 01/01/70 00:00 | |
Fire risk | 01/01/70 00:00 | |
Transformer | 01/01/70 00:00 | |
thats the best chioce | 01/01/70 00:00 | |
There's nothing wrong | 01/01/70 00:00 | |
Space | 01/01/70 00:00 | |
please do not go aargh | 01/01/70 00:00 | |
Opto isolator = LDR + Neon? | 01/01/70 00:00 | |
10mA? | 01/01/70 00:00 | |
Hmmm | 01/01/70 00:00 | |
Why not... | 01/01/70 00:00 | |
Neon + Photodiode | 01/01/70 00:00 | |
Loosing brightness | 01/01/70 00:00 | |
Transformer isolation is needed! | 01/01/70 00:00 | |
Previously, on 8052.com | 01/01/70 00:00 | |
Safety first | 01/01/70 00:00 | |
Transformer | 01/01/70 00:00 | |
Sorry | 01/01/70 00:00 | |
two places to look | 01/01/70 00:00 | |
Annoying, isn't it?! | 01/01/70 00:00 | |
Thanx! | 01/01/70 00:00 | |
maybe Amveco 6200 series? | 01/01/70 00:00 | |
Transformers | 01/01/70 00:00 | |
Could also be used | 01/01/70 00:00 | |
an Idea | 01/01/70 00:00 | |
The simplest ideas are the best | 01/01/70 00:00 | |
Poor dads | 01/01/70 00:00 | |
Tainted food | 01/01/70 00:00 | |
Yes, but... | 01/01/70 00:00 | |
Low current | 01/01/70 00:00 | |
Exactly! | 01/01/70 00:00 |