i am testing your design, i make my PCB with your design but i get only a noisy sound, it has sound at the spdif output but with a high pitch noise, the noise is bigger than the music
wich capacitor gives problem to you?
Attached is the schematic of the VDO CDC(with analog audio input) simulator with Atemga8L.
Any answers to my questions (see here), please?
Mmmh, I'm not the author of this schematics, but let's see if I can help...Quote:
Originally Posted by azarazaga
Yes / YesQuote:
Followin are my doubts:
A) "Do not mount C1 (pin 1-3)". I guess it refers to pins 1-3 of MAX232 according to MAX232 datasheet. Should I mount the remaining capacitors (C2, C2, C4 & C5)?
If you have the exact MAX232 and not a variant, see top of page 17 of the data-sheet.Quote:
B) Which pin number of the MAX232 should I use here?
C) Which pin number of the MAX232 should I use here?
D) Which pin number of the MAX232 should I use here?
E) Which pin number of the MAX232 should I use here?
B is a Tx input, so use T1in on pin 11
C is the output of the same Tx, so use T1out on pin 14
D is a Rx output, so use R1out on pin 12
E is the input of the same Rx, so use R1in on pin 13
I have ideas on this, but I'd prefer Ale to explain this to be sure not to fry anything... Ale ?Quote:
F) I don't understand GP23. What does it mean?
G) "MAX232, V+ connect to 12V battery when programmin PIC". Can I use a stabilized power supply (with and 78L12 voltage regulator) instead of a 12V battery?
Many thanks for your help, Vicne. Still waiting for Ale...
Marry Christmas and Happy New Year 2007 to everybody :-)
Hi happy new year to All!
Sorry for the long absence!
F) the GP23 is a small alcaline battery of 12V that I use for programming PIC. In this circuit I use a MAx Tx driver to convert 0-5V of the LPT1 to a 0-12V signal needed by the 16F688 to enter the programming mode.
It need at least 10.5-11V on pin MCLR(pin4) to enter programming mode, and the internal voltage doubler of MAX232 give less than 10V, so I tied the V+ pin to this battery, and the doubler capacitor C1 is not needed anymore.
G) Sure the regulator 78L12 can be used insead of the battery without problem.
In normal running mode the MCLR is left open, the internall pullup provide the correct +5V level.
Thank you very, very much, Ale.
Have anyone thaught of using a divx player instead of portable computer? It has SPDIF out, it is low cost and it can be easily controller by simulating remote controll.
I think I found another way to enable "input" in Cabasse TunerList amplituner.
Car Radio Digital Signal Processor Philips Saa7708H used in this unit, has two digital spdif inputs. Spdif1 (pin25) is used by additional cd changer and, as we all know to eneble it we have to have cdc or an adapter. But spdif2 (pin24) is used by internal cd drive of HU, and this one input is always enabled when compact disc is inserted. So we can use the same circuit with relay like Vince used, but we don't need cdc and any cdc emulators.
I would like to add some pictures, but I don't where is this option at this forum.