555 timer frequency change problem

Hero999

Banned

• Mar 30, 2010

• #21

This circuit will be fine as long as the power supply voltage is below 6V.

When powered from 6V it will produce as much ultrasound as the 555 circuit does when powered from 12V.

I assume the piezo doesn't use much power? The maximum output current of this circuit is 50mA.

 

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Thunderchild

New Member

• Mar 31, 2010

• #22

something like that, a fully integrated counter will give you a 1000 division with flipflops you will have to use a number of IC's to get the same result

 

Hero999

Banned

• Mar 31, 2010

• #23

Why would you need a counter? He wants 40kHz, the circuit uses a 40kHz crystal, only one IC is needed.

 

Thunderchild

New Member

• Mar 31, 2010

• #24

in the event he uses a higher frequency cystal, but I hope he gets a 40 KHz one

 

I

i12know

New Member

• Mar 31, 2010

• #25

yup, i assume they have a 40kHz one here as well. But will only get one after the long weekend which starts tomoro!! Thanks a lot guys for all the feedback, really appreciate that!