[sdiy] Triangulation rant!

[harry bissell]

Grant Richter wrote:
> Take a positive and negative saw and combine with a max(a,b) function. 
> Very smooth.

will still glitch during the sawtooth retrace, yes ???

The best thing would be a really really fast reset time...

H^) harry
>
> On Aug 21, 2006, at 7:11 PM, Ken Stone wrote:
>
>> Try an op-amp based precision rectifier.
>>
>>
>>> Im looking for a very well defined triangulation method, in saw to 
>>> triangle
>>> converters the diodes cuses a glitch (even if the diode is made out 
>>> of a
>>> trannie)
>>> wich usually is compensated by a cap, is there any other methods 
>>> that temp
>>> variation and amplitude variations and glitch could be kept to an 
>>> absolute
>>> minimum?
>>> Even if i have to go as far as keeping the triangulation cirquit in 
>>> a oven!
>>>
>>> My problem is that i need several separate suboctave triangles, 
>>> there is
>>> several
>>> approaches for this however im looking for near or close to absolute 
>>> amplitude
>>> uniformity from  60Hz to 14KHz wich might look trivial but in a 
>>> deeper look at
>>> it it's
>>> not! The symnetry however does not have to be perfect slight leaning 
>>> is Ok as
>>> long
>>> i dont get any glitches or under/over shot's!
>>>
>>> Im starting to incline/batter towards an precision saw osc and creating
>>> suboctave saws and switch them periodically with the aid of a phase
>>> positionable PW  to generate the triangels and to overcome the glitch
>>> in the switch for overlapping and cancelling sawtoth's.
>>> Or by using clamping op amps wich is quite expencive but would
>>> give top notch performance (wich i dont need, geee)!
>>>
>>> What op amps can withstand input clamping without phase reverse?
>>> ie, lets asume a input voltage of +/-10V and a supply of GND and +15V
>>> the opamp is supposed to clap the negative portion of the inputssignal!
>>>
>>> Any ideas folks?
>>>
>>> KD
>>>
>> _______________________________________________________________________
>> Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
>> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
>
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