dislocations
- Feb 21, 2012
- 25
- Joined
- Feb 21, 2012
- Messages
- 25
Hi,
Hope u are all well since my last visit here (2 years ago?).
I'm looking for a bit of help with a circuit I'm building. It's a siren based on a 555 which is familiar to many of you. I'd like to make the rise and fall quite long, around 10 seconds from low to high and back to low. I would like to make this a sine wave.
I also thought of using a 40106 instead of a 555 as I prefer the ease of use. If I did it that way I would use 2 40106's......one modulating the second.
In the past I've sort of acheived this kind of thing by putting a large cap from the output of the first to ground. I realise this is not the best way? I'd also like to be able to alter the frequency of the first.
Thats probably as clear as mud? Sorry!!!
Hope u are all well since my last visit here (2 years ago?).
I'm looking for a bit of help with a circuit I'm building. It's a siren based on a 555 which is familiar to many of you. I'd like to make the rise and fall quite long, around 10 seconds from low to high and back to low. I would like to make this a sine wave.
I also thought of using a 40106 instead of a 555 as I prefer the ease of use. If I did it that way I would use 2 40106's......one modulating the second.
In the past I've sort of acheived this kind of thing by putting a large cap from the output of the first to ground. I realise this is not the best way? I'd also like to be able to alter the frequency of the first.
Thats probably as clear as mud? Sorry!!!