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 Forum index » DIY Hardware and Software » Thomas Henry designs
Yet another SN76477 question...
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Pehr



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PostPosted: Sun May 20, 2007 1:20 am    Post subject: Yet another SN76477 question...
Subject description: VCO pitch control of the SN-voice...
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In the TH&SS SN-voice the processed CV inputs is connected to pin 18 of the SN-chip, but I read in the SN76477 datasheet that it is pin 16 that controls VCO pitch Confused Question and that pin 18 is for "VCO control resistor"...

Is the SN-voice schematic correct? or should I do like the datasheet?

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Thomas Henry



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PostPosted: Sun May 20, 2007 2:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

The SN-Voice schematic is correct.

Actually, pin 18 is a control current input, while pin 16 is a control voltage input.

Thomas Henry
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Pehr



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PostPosted: Sun May 20, 2007 3:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks! Very Happy
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PostPosted: Fri Jun 22, 2007 2:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Is it possible to run the SN-voice on +/-12V instead of 15? are there any modifications I have to do for that? Confused
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PostPosted: Fri Jun 22, 2007 4:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Is it possible to run the SN-voice on +/-12V instead of 15? are there any modifications I have to do for that?


It seems like you could operate from those voltages and not have any trouble. With 12V/-12V things would clip earlier as the operational amplifiers output can only go about 1.5 volts from the rail, but you will not even approach that point so it's a not an issue.

Bill
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Pehr



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PostPosted: Sun Jun 24, 2007 1:42 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks! Very Happy
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