A Few Simple Questions

[Fraser, Colin J]

> -----Original Message-----
> From: Roman Sowa [mailto:rsowa at WizjaTV.pl]
> Sent: 09 March 1999 15:16
> To: synth-diy at mailhost.bpa.nl
> Subject: ODP: A Few Simple Questions
> 
> You can make a good DAC
> 	yourself - it may suffer small linearity problems, but 
> will be very
> fast.
> 	HC241 (for example) as a buffer and R-2R resistor ladder. Worked
> fine
> 	for me many times.

A 40174 buffer and R-2R network of 0.1% matched 100k resistors is used as
the DAC in the tb303.
Discrete DACs always output a more squelchy 'acid' cv 

;-)

On the same subject, has anyone tried using a one-bit dac for generating cvs
?
There is an AVR microcontroller with inbuilt UART and several output lines
that might make a very simple multichannel cv convertor - you could use 4
outputs as bit stream DACs, and 4 as gates...


Colin f