Salas hotrodded blue DCB1 build - Page 284 - diyAudio
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Old 2nd March 2013, 09:47 PM   #2831
mantha3 is offline mantha3  United States
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I thought I've seen others running some LED power indicator bulb from the VOUT. The specs on this kit that the DC 10 volt is to just power the LED lights in the VU meters

I supose I could just build and then listen... Try this kit connected and see if I hear any difference?

I'm pretty new to this. I'm not sure what pollute the power feed means.. I was just thinking the 100VA transformer, all the caps in the power supply.. That the power supply would be able to handle just a bit more load.
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Old 2nd March 2013, 09:50 PM   #2832
Salas is online now Salas  Greece
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Just experiment with it. Hook it up on various power feed points described and see if its detrimental at all. If it is we may throw a couple of ideas.
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Old 2nd March 2013, 09:53 PM   #2833
mantha3 is offline mantha3  United States
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Quote:
Originally Posted by Salas View Post
If that circuit ain't a burden creating too much heat on the 7812 for the relay, take a +12V auxiliary line from there. So not to mess with the audio PSU. Can also tap off from the positive side filter caps with a twisted pair to an additional LM7812 for the meters circuit. With 0.1uF caps across the chip reg's input and output for its stability.
For the "take a +12V auxiliary line from there" How do I ID the spot on the PCB where you are talking about?
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Old 2nd March 2013, 10:04 PM   #2834
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Sorry for the noob question here... I am about to place an order with the Canadian toroidal transformer company "SumR". His transformer come with a 117V primary. I understand that Canada has 110V line voltages. My wall voltage ranges from 116-122. I can get him to wind a 120V primary version. Just wondering if this is an issue...? I am planning to get the 80VA, 2X15V toroidal with all shielding. Thanks in advance
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Old 2nd March 2013, 10:07 PM   #2835
Salas is online now Salas  Greece
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Quote:
Originally Posted by mantha3 View Post
For the "take a +12V auxiliary line from there" How do I ID the spot on the PCB where you are talking about?
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Old 2nd March 2013, 10:09 PM   #2836
mantha3 is offline mantha3  United States
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Ah, thanks salas!
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Old 2nd March 2013, 10:16 PM   #2837
mantha3 is offline mantha3  United States
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How much can you pull from that spot before it gets to be too much?
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Old 2nd March 2013, 11:50 PM   #2838
Salas is online now Salas  Greece
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120mA with 15VAC trafo and no 7812 sink. Having the relay and the LED to cater for already, say 100mA spare.
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Old 3rd March 2013, 12:06 AM   #2839
mantha3 is offline mantha3  United States
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I think this may work then... "Power out for backlight 10-15VDC 50mA" in the listing.
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Old 3rd March 2013, 02:43 AM   #2840
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Originally Posted by madisonroberts View Post
Sorry for the noob question here... I am about to place an order with the Canadian toroidal transformer company "SumR". His transformer come with a 117V primary. I understand that Canada has 110V line voltages. My wall voltage ranges from 116-122. I can get him to wind a 120V primary version. Just wondering if this is an issue...? I am planning to get the 80VA, 2X15V toroidal with all shielding. Thanks in advance
The nominal line voltage in Canada is 120V. I am on the same power grid as SumR. I just measured a few sockets in my house and it varied from 118-120.5V. Just take the stock unit.
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