[sdiy] Help with sawtooth convertor

[Tim Ressel]

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