Does anyone have a simple circuit to control a tone using a 0-9 volt signal?
I tried using a 555 timer circuit and small speaker. I can get a tone but I
can't get the voltage signal to vary the tone. The circuits I found where
complicated VCO/synthesizer circuits. Just looking for a simple low current
(under 10 milliamp range) circuit. Thanks for any help.

Apply a control voltage on pin 5. This will vary your tone.

"js1180" wrote in message
...
Does anyone have a simple circuit to control a tone using a 0-9 volt
signal?
I tried using a 555 timer circuit and small speaker. I can get a tone but
I
can't get the voltage signal to vary the tone. The circuits I found where
complicated VCO/synthesizer circuits. Just looking for a simple low
current
(under 10 milliamp range) circuit. Thanks for any help.