[sdiy] Divide down question

[David Moylan]

This was done in the Paia Strings n' Things.  Schematics are floating 
around on the net.

Dave

Tom Wiltshire wrote:
> One thing that you can do to get pulse waves is to start with a standard 
> square-wave divide-down scheme, but then run pairs of square waves at 
> octaves into AND gates. If you feed a square at frequency f and one at 
> 2f into an AND, you get a 25% pulse wave out the far end. You could use 
> 4f and have 12.5% if you prefer. Given that you've already got all the 
> octaves you need, this seems like the easiest way to get divided-down/up 
> pulse waves.
> 
> T.
> 
> On 25 Aug 2009, at 09:55, Scott Nordlund wrote:
> 
>>
>> It could be done with sawtooth waves too:  use a comparator to make a 
>> square wave, invert it, amplify the sawtooth by a factor of two, and 
>> mix the two.  Of course the comparator's threshold has to be adjusted 
>> properly, or there will be asymmetric pulses and sub-harmonics 
>> sneaking in...
>>