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...
Just re-thought my idea...........the dual supply was a pain and achieving excellent results with an LM386. Basically feeding the output back to the input with an RC network. May be not the best way of doing the job but it works! I'll revisit the op-amp method at a later date. Many thanks again...
Many many thanks again for you're knowledge. It's wonderful that you are able to share it with me in your own time!!!!
The reason I ask about op-amps in the first place is cos I'm building this:
http://www.electro-music.com/forum/viewtopic.php?highlight=lm741&t=3489
It's the hand drawn...
Hi,
Sorry if this is a bit vague:o
I'm looking round for a schematic for a VCF (easier the better). In short I want a LPF that is controlled by a oscillator outputing sine, square, sawtooth waveforms. I want to be able to control the rate of the oscillators.
Any advice would be great!