[Garbz]

I'm still trying to get my digital volume control working properly. It's based on 2x DS1802, controlled by a Rotary Quadrature encoder, and an LS7083 which converts the quadrature signal into low going pulses down and up on different pins.

Fairly simple really encoder feeds A/B pins, as it turns the LS7083 (not 7183 as the schematic says) puts out pulses for the DS1802's volume up / down pins. Also R7 is 10Mohm atm with still no luck.
That's the theory anyway and I've been debugging it for days.

I need your opinions on this if i'm reading these datasheets correctly:
http://pdfserv.maxim-ic.com/en/ds/DS1802.pdf The DS1802 states on page 15 that the minimum pulse on the pushbutton input is 1ms.
http://www.kollar.com/observatory/dome/parts/ls7083.pdf The LS7083 however shows graphs for RBIAS on fig 4/5 page 4.

If I am reading this correctly the LS7083's maximum pulse is 30us? I think that makes the decoder and the DS1802 completely uninterfacable unless anyone can come up with some bright sugestions.

Any help?

 

[skilpad]

Hi, it would seem that you have to stretch the pulse,
There are all sorts of tricks to do this you could use normal logic inverters and a RC delay (often used as a de-bounce circuit on mechanical switches)
or you could use a one-shot with adjustable delay (similar to what they use inside the LS7083).
Both will sadly add complexity to the circuit
Google for the above, I’m sure there will be plenty results
Hope this helps