LFO mod help

[tilde]

Hi

I'm attempting to build the LFO mod as illustrated at casperelectronics (http://casperelectronics.com/finished-pieces/speak-n-spell/speakspell-bending/).

The toy that I am using is only powered by 3v (2x AA) battery which does not seem sufficient to power the LFO. Can anyone suggest what modifications I need to make in order to make it compatible  -  changing capacitors, resistors etc?

It's my first attempt at building one of these so please excuse me if I'm missing something obvious.

Thanks

[Circuitbenders]

it depends what 555 you're using, but the minimum supply voltage of most 555's is around 4.5v.

I doubt it'd work on 3v no matter what changes you made.

[tilde]

Thanks for the reply

I didn't know there were different flavours of 555.  I've now ordered some TS555CN low power versions and will try them out tomorrow.

Learning new stuff everyday!

[Circuitbenders]

I suspect that even with a low power CMOS version, you'll probably have an issue with not being able to get a very wide sweep using a 3v supply. It can't give you a pulse at a higher voltage than the supply voltage and the output current it can deliver is virtually nothing.
http://www.talkingelectronics.com/projects/50%20-%20555%20Circuits/50%20-%20555%20Circuits.html#G1

You might as well give it a go though. 

[tilde]

Wow a 555 bible - fantastic resource!
I'll give it a try and get back to you folks