SV: Re: [sdiy] integrator / capacitor leakage

[karl dalen]

You can do a discrete very high speed NCO by using regular
logic, a simple 16 bit unit wouldent need many, about 5 IC's,
look in the Hal chamberlins book , chapter digital oscillators,
complete schematic, easy to controll, place a EPROM in front
for tuning table if you wish, can easily do octature whatever,
just phase shuffle the sinus prom by tapping of the counter at
differen positions.

Use whatever DAC you need PCM56/54 are fairly cheap, less
then 10euro in units. One NCO/ACCU does many oscillators.
Pyshically larger then a DDS chip but has the great feature
of not distrurbing JH's analog brain with digital numbers 
and opcodes and instructions, assemblers,101001110101, etc! ;-)

KD (whos brain are bananalog too). 

--- jhaible at debitel.net skrev:

> > If you're really just needing sine waves - which are easy to make 
> > digitally without aliasing - it's hard to come up with a solid reason that 
> > analog is necessarily better in that application.
> >
> 
> I'm already convinced. 8-)
> 
> Are there chips out there which do this? I don't want to start 
> programming, so the obvious solution, DSP with on-chip ADCs and 
> DACs, won't help me much.
> 
> JH.
> 
> -------------------------------------------------
> debitel.net Webmail
>