waveshaping

[Martin Czech]

> I have a subharmonic generator I would like to shape into a sawtooth with the minimum number of parts.  Has anyone got a tested circuit?
> 
> Cheers,
> 
Depends ;->

Does your generator have some saw at all?
I guess your divided frequencys are based on sqares 50% duty cycle?

If so you just need to add your 1x saw to your 1/2,1/4, 1/8 and so on square.
try it on a piece of paper. The odd numbers are a bit more diffcult,
but I think there is a similar way.

If your divider products are pulse shaped, you could divide them by 2.
To compensate you could let the main counter count on both edges of
the incomming clock.

If you don't have a saw at all, well then you need a charge-run down network,
basically this is a hard synced saw osc. Of course you get tracking problems etc.
But this would only affect amplitude, which may be not harmfull for your application.

It is hard to notice 10% amplitude drop.

Oskar Sala`s Trautonium uses hard synced saw oscillators (Thyratron tubes)
for subharmonics.

m.c.