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 Forum index » DIY Hardware and Software » Thomas Henry designs
SN voice frequency range
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andrewF



Joined: Dec 29, 2006
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PostPosted: Sat Oct 06, 2007 5:13 am    Post subject: SN voice frequency range
Subject description: set by capacitor?
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I want to explore different settings on the freq range of my 2nd SN-Voice.
Can I do this by changing C13 (currently 0.022 uf) coming from pin17 of the sn76477? cheers
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State Machine
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Janitor


Joined: Apr 17, 2006
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Location: New York
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PostPosted: Sat Oct 06, 2007 10:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, you can. It may effect how the high frequency compensation for the 1V/Octave operates but that may not matter to you.

The VCO frequency is expressed by the following:

Minimum Freq=(.64/(Rvco x Cvco))

The maximum frequency is a 10:1 ratio and thus is expressed:

Maximum Freq = 10 x (Minimum Freq)

I forget exactly what the upper limit frequency is on the IC but the VCO goes beyond the audable range of human hearing.

In addition, the VCO control resistor, Rvco, must be no less than 7.5K in accordance with the datasheet.

I believe it was also discovered that the SLF frequency can be made much higher than the published data so you do a bit of experimenting there as well if you so wish.

Bill


Hope this helps .........
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andrewF



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PostPosted: Sat Oct 06, 2007 6:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks Bill
will have a play with it soon.
I read the SLF can attain 20kHz, not very super low freq for synth people.
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