How change the Frequency of a 555 timer with another circuit ?

[crutschow]

Is that true ? Will this chip run at that freq ?

Depends upon whether you are driving will emit noise from the pulses.
Below is the circuit operating at 20kHz.

 

[ramussons]

Hello,

If I wanted change the frequency of a 555 using a processor or some other logic circuit, how would I configure that circuit ? Can I just use some switching transistors to short or change resistance value on the 555 ?

Any help is appreciated.
Thanks

You can change the frequency of a 555 by changing the voltage on pin 5.