[sdiy] ACCU osc

[karl dalen]

Page 596.
describes a 8 bit version,two 7483A feeding two 74175
(registers)who in turn feeds the 7483A (simple counter IC)
the clk output from 7483A goes to 74161 clk input
74175 clk input and 74161 CET and CEP inputs get 
the master clock, and thats about it. Actually you 
dont need the 161!

Now you can build!

Sorry i ment the ACCU osc not the
plain NCO who dont use bin adders.

KD


--- "JH." <jhaible at debitel.net> skrev:

> 
> > 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.
> 
> 5 ICs for 16 bit sin/cos sounds good! I don't have the  book, though ...
>  
> > 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! ;-)
> 
> 8-)
> 
> JH.
>