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DS1802 Help

post #1 of 10
1/22/11 at 3:25pm
Thread Starter 

I got a couple of the DS1802 Digital volume controls to play

around with and was wondering what others have come up

with for their applications. I see that you can either use it

single ended or with dual rails. I would like to use the dual

rail solution. How have you created the +/-2.5 volt supply?

 

I look forward to your comments...

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post #2 of 10
1/23/11 at 1:52am

 

See here: http://web.archive.org/web/20060717211152/http://www.pedjarogic.com/spot/index.html

I was planning to do this a long time ago, but somehow it fell of the radar. I still have my chips though. Play with it and let us know!

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post #3 of 10
1/23/11 at 9:44am
Thread Starter 

Thanks, that was pretty much exactly what I was thinking of.

I will already have a well regulated power supply to tap into

so the local regulation does not have to be anything spectacular.

 

Any recommendations for a Rotary Encoder?

I'm probably just going to stick with a simple switch

for the prototype.

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post #4 of 10
1/23/11 at 5:27pm
Thread Starter 

Here is what I have so far...

 

I haven't decided whether to use board mounted

jacks or just wire pads and I haven't picked the

switch yet either.

 

DS1802.png

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post #5 of 10
1/25/11 at 8:02am
Thread Starter 

I decided to just go with wire pads so I could

locate the sub board where ever it needed to be.

 

Any errors? Comments?

 

Volume Sch.png

 

Volume Brd.png

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post #6 of 10
2/5/11 at 3:07pm

I came across some of my notes on this chip.  Seems that a pulse rotary switch Alpha SR10030 can be used instead of push buttons.  I have not tested this yet, but its available at Mouser .

 

http://www.mouser.com/catalog/specsheets/TW-700001.pdf

 

pricey at $6.40 though...

 

Any updates on your experiment?

 

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post #7 of 10
2/5/11 at 3:26pm
Thread Starter 

I'm just getting an order ready for Digi-Key...I'll have to see if they have that

or anything similar. Looks promising, thanks for the tip!

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post #8 of 10
2/5/11 at 3:35pm
I'm using a pair of DS1802 in my DAC (it's balanced so that's why I need two). As for a switch, I use a very old two decks, three positions, break before make rotary switch. I think it started its life as an input selector in a vintage amp. It was free, works perfectly for me and allowed me to use a big comfortable knob. I'm using the rotary as you would use push buttons : turning it to the left reduces volume, turning right increases, center is neutral. I mostly use it by letting it make contact for more than 1 sec in either direction though. The DS1802 interprets a long contact by changing the volume by 1 step every 1/10sec until you stop contact. It works for me, a rotary encoder would give a more analog feeling.

It is important to note that those DS1802 work best if followed by a very high impedance. 1meg or above is ok. They also don't swing much voltage (I wouldn't use those for more than 1Vrms) so don't use them after a CDP line out or add a 47K resistor inline to limit what goes in.
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post #9 of 10
2/5/11 at 3:40pm
Thread Starter 

I didn't see anything at Digi-Key.

 

Here is the link to the part at Mouser.

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post #10 of 10
2/5/11 at 4:16pm
Thread Starter 

Thanks 00940.

 

Both of the projects I want to try with this have JFet inputs.

 

My USB DAC has a pretty low output and I can lower the

output from my PCM1793 DAC so the volume control

does not clip. I have read about that nasty little trait

it has. It's too bad they could not have made it with

a little more voltage headroom...

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