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 Forum index » DIY Hardware and Software
supersimple quadrature funk-tion generator
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g.gabba



Joined: Nov 29, 2008
Posts: 365
Location: berlin
Audio files: 23

PostPosted: Wed Jan 03, 2018 2:52 am    Post subject: supersimple quadrature funk-tion generator
Subject description: triangle (simulation) added, inculding vco and TZVCO
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hi guys!
and happy new year party!

Some months ago i have realized that a square wave produced of a triangle osc and the square wave produced of a comparator processing the triangle wave of the same osc ... has a 90° phase difference.
I thought this could be usefull in a frequenzyshifter application. But recently the friendly voice in my head told me how it could be used for "supersimple triangle-ish quadrature funktion generator".

attached the concept of the 90° squarewave, the whole quadrature circuit and the evidence scope from the breadboard test.

cheers, bb, gabbagabi


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Last edited by g.gabba on Mon Aug 06, 2018 9:37 am; edited 1 time in total
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PHOBoS



Joined: Jan 14, 2010
Posts: 3975
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PostPosted: Wed Jan 03, 2018 11:31 am    Post subject: Reply with quote  Mark this post and the followings unread

neat Very Happy

I got a bit confused at first as I thought it used one of those standard dual opamp sqr/tri oscillators. Maybe something
similar can be done with one of those which would result in linear slopes. I guess C1 & C2 should be matched for best
results. Stereopotmeters already have some tolerance too of course. Maybe using seperate pots and mixing the waveforms
together could get some interesting results as they are created from 1 oscillator so it would not be drifting in/out of phase.

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g.gabba



Joined: Nov 29, 2008
Posts: 365
Location: berlin
Audio files: 23

PostPosted: Wed Jan 03, 2018 11:51 am    Post subject: Reply with quote  Mark this post and the followings unread

thx,

i have simulated some things with the standard tri/sqr VCO, but there the output tends to drift away from the 0V line.
until now i did not found a solution for that.

till now the relaxation osc it works fine.
the tolerances of the caps and pots are only resulting in amplitude differences.

i will try it the "normal" tri/sqr osc tomorrow.

cu
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g.gabba



Joined: Nov 29, 2008
Posts: 365
Location: berlin
Audio files: 23

PostPosted: Mon Aug 06, 2018 9:36 am    Post subject: Reply with quote  Mark this post and the followings unread

hi gang,
after finishing the sequencer thing (i need to post the schemo, sometime), i have layed down the soldering iron, and the friendly little voice in my head told me that it is time to quit.
but iam full of positive memories, especially of those moments when a circuit have worked Very Happy .
It will always be a part of me, and iam 100% shure iam getting back to it one day, and of course follow this wonderfull forum and may i give my 2 cents from time to time (always hoping it will be usefull), and, like now, completing unfinished task like now.

long story short. while cleaning the HD i came accros a book that i had never read, and there was written the answer to the drift problem. the answer is: a feedback resistor, which is stabilizing the amplitude of the 45° integrator.
And if ther is a generator there should be an oscillator, and if there is an oscillator it should go thru zero.

hope someone will enjoy it
keep in mind it is a simulation and play with the cap and integrator resistor values to make it more low or high frequency. To accomplish full quadrature u need to add some inverters.

cu,
gabbagabi


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StephenGiles



Joined: Apr 17, 2006
Posts: 503
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PostPosted: Mon Aug 06, 2018 1:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Aha, one of these is used in the Electroharmonix Flanger Hoax!
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g.gabba



Joined: Nov 29, 2008
Posts: 365
Location: berlin
Audio files: 23

PostPosted: Mon Aug 06, 2018 1:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

dont know that, do u have a link to the schemo?
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