555 Timer, Astable Oscillator Help

[Gifters]

I'm trying to use a 555 timer to output a specific frequency for an
indefinite period of time, no more than a minute, for the application
I need it to output 2 signals at about 28 hertz (with some fine
tunning) independent of each other, I have a circuits I setup (that I
found online) now that seems to work fine except its running in the 3
to 6 hertz range it seems to output both at the same frequency for an
indefinite amount of time, I'm new to 555 timers and I've tried
looking online for equations but I'm failing to see relation between
their circuit and my circuit, here is link to a diagram of the circuit
I have

http://picasaweb.google.com/Gifters/555TimerHelp/photo?authkey=o6LPg8PSSZg#5129763849743544274

Thanks for your help in advance

Gifters

 

[John Fields]

I'm trying to use a 555 timer to output a specific frequency for an
indefinite period of time, no more than a minute, for the application
I need it to output 2 signals at about 28 hertz (with some fine
tunning) independent of each other, I have a circuits I setup (that I
found online) now that seems to work fine except its running in the 3
to 6 hertz range it seems to output both at the same frequency for an
indefinite amount of time, I'm new to 555 timers and I've tried
looking online for equations but I'm failing to see relation between
their circuit and my circuit, here is link to a diagram of the circuit
I have

http://picasaweb.google.com/Gifters/555TimerHelp/photo?authkey=o6LPg8PSSZg#5129763849743544274

---
If you want two separate output frequencies you'll need to use two
separate timers wired as astables, and if you want to have them both
running/stopped for the same time you'll need another timer wired as
a monostable in order to do that.

What's the range of trim you require for the 28Hz, and what's the
range of ON time you need?