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Old 3rd March 2013, 02:16 PM   #2851
Tea-Bag is offline Tea-Bag  United States
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This is the unit I now ship with the kits.

6237BG - Board level heatsinks

Some people use non at all on the 7812. I have not heard of one blowing up.

I have updated the BOM on page 1 to reflect this. There are sometimes part substitutions as kit stock as I order it is not available.
Often if one vendor runs out, they all might.
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Last edited by Tea-Bag; 3rd March 2013 at 02:20 PM.
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Old 3rd March 2013, 02:26 PM   #2852
mantha3 is offline mantha3  United States
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Cool...

I was planning to do two sets of output using the Salas advised "100 Ohm buffer resistors Y split" This VU board has a R/L channel input...

So would I do the Y split on the two sets of RCA outputs and then run a 3rd set of outputs to this VU board I think

So I'd have for a channel output off of the DCB1 3 lines out. I'd Put 100R in line with each output RCA. Think I should run a line direct from the DBC1 to this VU board or should I put a 100R inline here to the VU as well?
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Old 3rd March 2013, 04:50 PM   #2853
stajo is online now stajo  Sweden
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A question about CCS differences due to PMOS/NMOS Vgs differences. I had less currentdraw on the negative rail on all 4 cards, as mentioned before. The relation is about the same on all cards. Putting a 56R over 10R on negative side makes about 8,4R measured and that about balanced it out. That makes a relation 8,4/10.

Do you think this relation will stay if I grill each side a bit more? I was thinking to buy some 3,3R and 4,0R caddocks, but they dont come free.

best regards
Staffan
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Old 3rd March 2013, 04:52 PM   #2854
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally Posted by stajo View Post
A question about CCS differences due to PMOS/NMOS Vgs differences. I had less currentdraw on the negative rail on all 4 cards, as mentioned before. The relation is about the same on all cards. Putting a 56R over 10R on negative side makes about 8,4R measured and that about balanced it out. That makes a relation 8,4/10.

Do you think this relation will stay if I grill each side a bit more? I was thinking to buy some 3,3R and 4,0R caddocks, but they dont come free.

best regards
Staffan
I beleive Salas voiced it, or deemed it to sounds better out of balance this way ---- but it may not to you.
BTW, this issue occurs in the SSLV1.1 boards as well, but there you want to correct it.
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Old 3rd March 2013, 04:59 PM   #2855
stajo is online now stajo  Sweden
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Quote:
Originally Posted by Tea-Bag View Post
but it may not to you.
I wouldnt know, since I have not yet listened

Well, I'm working on a second hand baught malfunctioning lightspeed, thats why. Guess Ill plug'em in one day with a standard pot, but I havent yet.

Thanks
Staffan
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Old 3rd March 2013, 05:43 PM   #2856
Salas is online now Salas  Greece
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Quote:
Originally Posted by Tea-Bag View Post
This is the unit I now ship with the kits.

6237BG - Board level heatsinks

Some people use non at all on the 7812. I have not heard of one blowing up.
With that one I would not draw over 300mA from the 7812 for long term reliability.
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Old 3rd March 2013, 05:51 PM   #2857
stajo is online now stajo  Sweden
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I looked back how the values change before and after CSS adjustment.

Before:
Vout: -10,01 +9,98
DC offset L/R mA: 0,3/1,1

After:
Vout: -10,7 +10,4
DC offset L/R mA: 0,7/0,6

But after all, the values are so small it might be measuring faults, temp drifts whatever.
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Old 3rd March 2013, 08:49 PM   #2858
Salas is online now Salas  Greece
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Tc most likely.
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Old 4th March 2013, 06:00 PM   #2859
stajo is online now stajo  Sweden
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Today the dare devil flew in me
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Old 4th March 2013, 06:10 PM   #2860
Salas is online now Salas  Greece
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To exactly balance the main CCS currents (offsetting the PMOS-NMOS Vgs dif in essence) is mostly perfectionism since the Gfs of such MOSFETs does not vary appreciably for few decades of mA dif even. But perfectionism achieved gives satisfaction and peace of mind which is a welcome factor to any hobby.
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