Ajutor cu un volum digital cu DS1802

[mosfet]

L-am terminat acum mai mult timp, l-am abandonat insa cand am vazut ca nu merge. E atat de simplu ca e greu de gresit ceva, eu am reusit insa

 

Probat cu un mp3 player si un amp, am sunet, distorsionat insa iar potentiometrul nu are absolut niciun efect.

 

Comutatorul e asta - http://www.tme.eu/html/RO/intrerupatoar ... pelny.html

 

Cu masa nu sunt sigur, daca vin separat cele doua mase, analog si digital, sau daca sunt comune (intrarea/iesirea si alimentarea). In schema vad ca sunt marcate cu simboluri diferite.

 

Vreo idee?

[danzup]

Se pare ca nu ai inteles datasheetul .Uite cum trebuie sa faci schema.Nu poti folosi un encoder pentru up si down (de fapt ti-am mai zis asta atunci )!!!!Numai switch uri obisnuite !!!!!

[mosfet]

Schema nu-mi apartine, initial am gasit-o pe site-ul unui sarb cred (Pedja logic, ceva de genul) si de acolo s-a tot raspandit pe net si din moment ce a fost preluata de atatia, am presupus ca e corecta.http://circuit-zone.com/index.php?electronic_project=70 - cu tot cu explicatia de ce a ales alimentare simetrica

The DS1802 is the dual audio 45kOhm (typically) pot with 65 steps (64x1dB and mute), known around for its possibility to be controlled by its own pushbuttons instead of, usually needed, certain logic circuitry. It is available in DIP package and hence seems very appealing for DIY. Most of the digital potentiometers (there are exceptions like WM8816 and X9312) can not accept signals much beyond their supply voltages. For DS1802, 0.5V below the potential at its Gnd pin is the bottom, and 0.5V above the Vcc (whose safe maximum is 5.5V above the Gnd pin) is the upper limit. There are a few ways to center the signal inside these boundaries and Dallas recommends Wheatstone Bridge circuit (see App Note 161). I decided to shift the supply rather than signal, thus with one more regulator I could keep the signal path clean. So, DS1802�s Gnd pin went down to -2.5V and all the other pins of DS that normally should go to ground went to this pin: Agnd, Zero-Crossing (enabled) and Mode (stereo), as well as the Up/Down buttons. Resistive networks themselves are connected straightforward. The DS1802�s pin layout appeared almost ideal for such application.

Comutatorul ala nu e encoder - sau cel putin asa am inteles eu - e switch, comutator mecanic, exact ca doua butoane pt sus si jos. Intr-o vreme pe site-ul tme aparea si o schema electrica unde erau reprezentate contactele ca la un releu cu doua contacte, ceva de genul.Edit: http://www.adelaida.ro/product_info.php ... 81a941c0e9 - asta era schema electricaMai gasisem un proiect tot cu DS1802 care folosea un comutator care arata EXACT ca asta, doar ca autorul nu spunea producatorul, nu dadea nici datasheetul..

[danzup]

A ! Ok daca ala e doar un device cu 2 switchuri obisnuite . Ok si cu schema respectiva daca ai maxim 5,5V alimentare la circuit .Ce semnal introduci in el ?

[mosfet]

Dintr-un mp3 player portabil. Am incercat si cu volumul player-ului la minim si la maxim.Am incercat si sa scurt-circuitez pinii comutatorului in mod repetat, in ideea ca o fi encoder de fapt, astfel incat sa simulez un push-button si nimic.