Chime transformer orentation? t500

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harryf

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Chime transformer orentation? t500
« on: 21 Nov 2009, 09:41 pm »
Ok i have gone through everything in my chime build.I found a couple other errors i fixed.
I'm down to t 500.I have gone over the data sheet and the schematic.
I'm checking t 500 right now as the problem.I hAVE IT INSTALLED WITH tap 1 and 3 towards the front of the chassis.Tap 3 and 6 towards the rca's.
Is this the proper orentation?
If it was backwards would it blow a fuse?
I can't see under the board without pulling it out.
I think i have it in right but who knows maybe the identification on the top is installed backwards.

harryf

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Re: Chime transformer orentation? t500
« Reply #1 on: 22 Nov 2009, 12:21 am »
Pulled it put a new one in.tap 1 and 3 go down toward selector switch.
tap 3 and 6 go towards the rca's.
The dot on the circut board corrisponds to the same one on t 500.
I'm not getting any change from moveing the selector switch.That's my next area i'm checking.
I have litterally gon thru every part except the selector switch and the hag usb.I check voltages every time they are correct.
It's got to be one of them unless i messed up the chip on the board.
Unless windows vista does not in the default mode spit out 44.1.
or my dvd player(I think this one must be higher)or my old playstation 1.Surely it must put out 44.1.
I'm wondering why one rca goes on green still.It's always green which means a valid cd signal.
The only problem is nothing is hooked up lol!

dnewman

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Re: Chime transformer orentation? t500
« Reply #2 on: 23 Nov 2009, 09:05 am »
It's got to be one of them unless i messed up the chip on the board.

If Windows sees your Chime as a USB device, then the USB section of your Chime is likely working.  Not having used Windows since ~1999, I don't know offhand where to tell you to look to see what all active USB devices Windows is seeing.

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Unless windows vista does not in the default mode spit out 44.1.

You do have to conjure up the audio control panel and tell it to use the USB device for audio output (as opposed to using, say, your PC's sound card and attached speakers).

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or my dvd player(I think this one must be higher)or my old playstation 1.Surely it must put out 44.1.

Of course, DVD audio is not 44.1kHz.  However, if your DVD player will play vanilla (redbook) audio CDs, then it should output audio CD as 44.1kHz out its coaxial S/PDIF output.

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I'm wondering why one rca goes on green still.It's always green which means a valid cd signal.  The only problem is nothing is hooked up lol!

Folks have in the past reported off-by-one errors with the input selector switches. That is, what they thought was say 11 o'clock was 12 o'clock, etc.  So, it's conceivable that you're not selecting the input you think you are.  Furthermore, my CD player and my Squeezeboxes all output a base S/PDIF signal when powered on regardless of whether or not they are sending any audio signal.  So, when even when my CD player has no disc inserted, I will get a green light when it is selected at the Chime and the CD player is turned on.  Of course, a gotcha with the selector switch is installing the jumper correctly.  (See the third note in Section 2.4 of http://mtbaldy.us/~dnewman/chime/#S24.  And both those Chimes are still up and running and I listen to them most every day.)

Regards,
Dan

WGH

Re: Chime transformer orentation? t500
« Reply #3 on: 23 Nov 2009, 02:55 pm »
The audio output for DVD players has to be set to PCM for the HagUSB section to work. Bitstream output is only for Dolby Digital and DTS.

dnewman

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Re: Chime transformer orentation? t500
« Reply #4 on: 23 Nov 2009, 03:56 pm »
I'm wondering why one rca goes on green still.It's always green which means a valid cd signal. The only problem is nothing is hooked up lol!

Of course, if it's green regardless of the selector switch setting when *nothing* is hooked up -- no RCA, no USB -- then odds are the LED is soldered in in the wrong orientation.  Since the (common) cathode is the middle lead of the three leads, if you put it in rotated 180 degrees from the correct orientation, then you will get green when you should get red and vice versa.

Dan

harryf

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Re: Chime transformer orentation? t500
« Reply #5 on: 23 Nov 2009, 05:19 pm »
Your  kidding there is a orentation to the led?So its concevable that both are in backwards and my chime is a ok and i just need to find a 44.1 source.

dnewman

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Re: Chime transformer orentation? t500
« Reply #6 on: 24 Nov 2009, 06:23 am »
Your  kidding there is a orentation to the led?So its concevable that both are in backwards and my chime is a ok and i just need to find a 44.1 source.

All diodes have an orientation.  Sometimes, you get them in packages which can only be oriented one way (e.g., surface mount zeners in sot-23 packages). With these three lead bi-color LEDs with all leads in a plane and the cathode in the center, you won't kill them putting them in wrong, but you may not get the desired color behavior either.  You need to look at the package carefully from it's top side or bottom: look for the indentation or flat side to the otherwise circular cross section.  Then see if the board has an indicator.  (I seem to recall it having an asterisk.)  The indentation or flat likely lines up with the board's marking.

Failing a marking on the circuit board, you can pull the manufacturer's spec sheet.  (For some reason, Digikey doesn't have a link to it....  Just a one page dimensional drawing.)  From the spec sheet, you can figure out which lead is the red and which is the green.  Then look at the schematic and then at the circuit board and work out the orientation.

Dan