Simple sawtooth generator schematic simulation question

[Lucky-Luka]

I've tried to play a bit with the passives values of this circuit and I obtained max 2kHz freq signal.
Do you think that using this circuit I can obtain a 70kHz signal?
Would you suggest another kind of simple circuite for the purpose?
Thanks

 

[AnalogKid]

Or higher charge / discharge currents.

ak

 

[crutschow]

OMG... I have never told that I don't want to use a smaller cap... c'mon...

c'mon what?
That makes little sense.
Do you know what determines the frequency of that circuit?

 

[schmitt trigger]

Or higher charge / discharge currents.

ak

Or a smaller peak to peak voltage.

The equation says it all:
I * t = C * V, and since t= 1/f, then:
f = I /(C * V)

 

[Lightium]

Where did the OP get this schematic? I doesn't work to begin with.

 

[Lightium]

I reduced the voltage to 6, reduced the timing resistor and used diff. transistors. Works now at 387Hz. I think to reach 70KHz this circuit is gonna have to change a-lot.