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I was wondering if anyone had any site or diagram for a cheap (and preferably small) for a circuit for a 60 to 80khz frequency generator.

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    \$\begingroup\$ do you mean a tone generator? or a function generation? do you need a square wave, sine wave or saw tooth? \$\endgroup\$ – jsolarski Mar 10 '11 at 3:09
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    \$\begingroup\$ They are usually called oscillator circuits, so try searching for that term. \$\endgroup\$ – Martin Mar 10 '11 at 10:50
  • \$\begingroup\$ Im trying to build an ultrasonic pest repeller.Im assuming that it will generate a tone at 80 KHz constantly. Im not sure if the shape of the wave matters. \$\endgroup\$ – user3322 Mar 11 '11 at 16:28
  • \$\begingroup\$ What are you using to emit sound? Piezo or regular speaker? \$\endgroup\$ – endolith Apr 29 '11 at 20:43
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This relaxation oscillator must be the most simple you can find:

enter image description here

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  • \$\begingroup\$ Should be mentioned that the symbol in the inverter means it has a Schmitt trigger input. It won't work otherwise. \$\endgroup\$ – endolith Apr 29 '11 at 20:41
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My version of Jesper's MiniDDS will give you a variety of waveforms at 60 kHz to 80 kHz. It can be built for about £10.

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  • \$\begingroup\$ Im trying to build an ultrasonic pest repeller. Would this circuit work for an applicaion like that? I don't know why my science professor wants me to make it up to 80 KHz though... \$\endgroup\$ – user3322 Mar 11 '11 at 16:24
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    \$\begingroup\$ Leon's solution is overkill for what you need, but I presume he posted it before he knew exactly what your application was. \$\endgroup\$ – stevenvh Apr 29 '11 at 6:41
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You could probably use a Hartley oscillator or a Colpitts oscillator. If you know some basic electronics, you could easily design your own RLC circuit.

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  • \$\begingroup\$ Im trying to build an ultrasonic pest repeller. Would this circuit work for that? This is for a science project at school. Thanks for your help! \$\endgroup\$ – user3322 Mar 11 '11 at 16:26

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