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Old 8th December 2010, 05:06 PM   #71
Tea-Bag is offline Tea-Bag  United States
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Wester151,
The gnd is all common.
Don't need to populate all relays. Correct.
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Old 8th December 2010, 05:56 PM   #72
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Old 9th December 2010, 10:06 AM   #73
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Another perhaps silly question, but one that is perplexing me, albeit I have come up with an answer in my own mind, but want to check.

The question is around how to wire the rotary switch for the relays.

With a non relay design then I'm comfortable with wiring the inputs to a rotary switch. However as the inputs from the RCA's are directly connected to the relays, the standard pole/way wiring will have to be different.

The solution as I see it is with the 2 pole/6 way switch is to have connections from each of pole A's "ways" connected to selector inputs 1-6, and have a ground wire from pole B connected the Grnd input of the selector.

Is that a sensible/working solution?

Thanks
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Old 9th December 2010, 10:34 AM   #74
AndrewT is offline AndrewT  Scotland
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I'm not sure I understand your description.
The relay needs a supply to pull in.
Take a supply from the regulated relay supply.
Attach this to the centre pole of the 6way switch.
Connect one of the switched poles to the relay coil pad.
The return route back to the supply is in the PCB routing.
This brings the relay supply through the switch to the relay coil and then back to regulator.
Each switched pole goes to a different relay pad.
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Old 9th December 2010, 02:18 PM   #75
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Thanks Andrew.

I understand what you're saying, but am confused how that translates to the Mezmerize board.

I've included an image of the area that is currently causing me confusion - the area on the board titled selector. How would I translate your explanation into wiring the rotary switch using the "selector" area on the board? Would I still need to take a feed from the 12V regulated relay supply (I'm using a 12V relay), connect that to pole A on the switch, and then run a wire from Way 1 to the input at selector 1, a wire from Way 2 to the input at selector 2, and so on?

If so, what is the purpose of GND in the Selector inputs? Each of the relays allows you to connect left and right "live" inputs from the RCA's, plus the "ground" from each of the RCA's. For example, IN 1 in the top left corner of the image has three through holes - one for the left input "live", one for the right input "live" and the third, middle one, connects to the centre tap connection via the PCB rails and a small jumper. This I have assumed is for the signal input grounds to go to earth.

Thanks

Last edited by westers151; 9th December 2010 at 02:22 PM.
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Old 9th December 2010, 02:23 PM   #76
Salas is online now Salas  Greece
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Its all ready there for you. There is 12V supply on board -connected as it should, you do nothing- and there are 1...6 positions for the steps pins and gnd for the switch's output pin. Half a stereo switch does the trick.
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Old 9th December 2010, 04:18 PM   #77
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Thanks Salas - that's what I was talking about originally.
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Old 10th December 2010, 02:56 AM   #78
ramallo is offline ramallo  Europe
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Quote:
Originally Posted by Salas View Post
Yes. It can bring somewhat lower voltages than average by not driving the LEDS as hard, but its of no real consequence.
Hi Salas,

For the unmatched 170's, if I use GR type, what are the better idss values? (I have a bunch over 5mA)

And for the matched 170's, I saw here that on this case you prefer the 7mA values over the 8 to 10mA values, but the build guide shows that the 8mA to 10mA values are the preferable, what is the right value?.

Best Regards
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Old 10th December 2010, 08:19 AM   #79
Salas is online now Salas  Greece
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Use from your GRs those over 5mA so they turn on the LEDS good. We were getting many BL 8-9-10mA in batches back then and we put that in the BOM. Its not written in stone, 7mA will work as well only a little cooler and a bit less wilder for differences to find matching easier. Not really different, maybe a bit more easier for those having that region.
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Old 10th December 2010, 08:40 PM   #80
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Next question, the BOM says a decoupling cap of 150nF is required next to the BC517, yet there is nothing on the board for this.

Where does it go? Is it in the space near to the BC517 marked 100uF, and if so why does the BOM say 5 x 100uF are required? If it isn't the 100uF slot, where does it fit?

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