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Open Music Labs Forums • View topic - VCO

VCO

VCO

Postby michaelmartin2758 » Fri Aug 09, 2013 11:30 pm

hi

I wonder if anyone can help please
I'm using the VCO sketch.(arduino uno) When it loads it immediately puts out a sine wave at 554hz without a control voltage attached to the left channel input. when i send a voltage to the input and change the voltage it changes the frequency for a second then settles back to 554hz. I have tried both libraries.

ps the control voltage is being sent from another DAC /buffered using a separate Arduino uno

pps all other sketches work fine

ppps What did the zero say to the number eight ? ....................Nice belt

thanks for reading
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Re: VCO

Postby guest » Sat Aug 10, 2013 12:50 pm

its actually a hardware thing. the input is AC-coupled, so it always drifts back to 0. apply your signal at the IN_R or IN_L header, and it should work fine. but, be very sure that you are only applying a signal between 0V and 3.3V. what is the signal coming from?
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Re: VCO

Postby michaelmartin2758 » Sun Aug 11, 2013 6:35 am

thanks for that ...........i should have known it

i obviously had a bit of a brain freeze but i'm very old

everything's working now
i'm using a separate dac mcp4728 to generate control voltage to feed into the shield.......I've restricted the voltage with a diode circuit stuff ............so nothing above 3.2v is getting near it ......

thank you again
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Re: VCO

Postby guest » Sun Aug 11, 2013 1:35 pm

awesome, glad to hear its working. and good idea with the diode protection.
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Re: VCO

Postby michaelmartin2758 » Tue Aug 27, 2013 9:24 am

michaelmartin2758
 
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Re: VCO

Postby michaelmartin2758 » Tue Aug 27, 2013 10:26 pm

michaelmartin2758
 
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Re: VCO

Postby guest » Wed Aug 28, 2013 7:37 am

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