[sdiy] Fwd: An Improved Sine Shaper Circuit

[Ben Stuyts]

Here is David’s message including the gifs. Sorry about the problems.

> Begin forwarded message:
> 
> From: David G Dixon [mailto:dixon at mail.ubc.ca <mailto:dixon at mail.ubc.ca>] 
> Sent: Tuesday, April 21, 2020 1:25 PM
> To: 'Donald Tillman'; 'Renจฆ Schmitz'
> Cc: 'synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>'
> Subject: RE: [sdiy] An Improved Sine Shaper Circuit
>  
> I just simulated the Thomas Henry transistor-pair sine shaper, and compared the output to a 90-degree phase shifted pure sine wave of equal amplitude.  It is virtually impossible to tell the two apart จC THD = 0.57% -- light blue is the pure one, orange is the shaped one.
>  
> 
>  
> Hereกฏs the sine shaper circuit Iกฏm simulating จC this is exactly the circuit I build into all my VCOs (transistors are 2N3904, opamp is TL07X จC the 11k resistors get me closer to 10Vpp than 10k):
>  
> 
>  
> In what way does the output of the diff pair not look like a sine wave?
>  


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