[sdiy] Help with sawtooth convertor

[David G Dixon]

Why not just use a JFET?  I use 2N5485 for this, and it works a treat. 

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On 
> Behalf Of Tim Ressel
> Sent: Thursday, January 03, 2019 6:15 PM
> To: SYNTH DIY
> Subject: [sdiy] Help with sawtooth convertor
> 
> Hi,
> 
> Once again my ignorance bites be. I have a triangle to saw 
> convertor that works very well:
> 
> https://imgur.com/a/CutQtVC
> 
> But the DG448 is smt (and  pricey) and I need a pth solution. 
> The DG448 is just shorting the op amp pin to ground. I have 
> seen circuits using npn transistors and stuff like 2N7000 but 
> I cannot get that to work. The signal at that spot is up to 
> +/- 10 volts. Does anyone know how to do this?
> 
> Thanks!
> 
> 
> --
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
> 
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