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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas hotrodded blue DCB1 build
Salas hotrodded blue DCB1 build
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Old 12th April 2018, 01:14 PM   #5751
sthcoaster is offline sthcoaster  New Zealand
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Salas hotrodded blue DCB1 build
Quote:
Originally Posted by Salas View Post
Meaning 3R3 current setting power resistors. That will put about 10-12W on each side sink when using a 15-0-15 Vac transformer. Yes your sinking plan should prove sufficient. But move the gate stopper resistors from the board to directly on the MOSFETS gate pins if you will need cable extensions to them. Wire from each resistor's input side pad of the now empty gate stoppers board positions.
Thanks very much.

Build going well so far (except insufficient packing on the heatsinks and mishandling in transit meant that one ended up with dog ears and had to be returned for exchange). Just selecting and sourcing the 0.22uf cap - have a couple of options, can see Wima MKP10 is well liked, and will get that to try as well. Will start with Audionote tantalum resistor for 220r but also have Shinkoh to try - though it is 2w version so will have go in as a soldier.

Might try LDR down the way but for starters will use regular 20k pot.

Still digging through this thread. And enjoying the number of AndrewT posts on this project. No doubt I will be back with more questions if I can't find for myself what I need to learn.

Too many projects, not enough time, not enough pocket money!
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Old 12th April 2018, 01:27 PM   #5752
Salas is offline Salas  Greece
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Salas hotrodded blue DCB1 build
LDR is popularly well liked but it can add some THD of its own since it has light sensitive elements with some non linear capacitance and voltage coefficient. Starting with a regular 20k pot is a safe way you will establish a subjective reference to compare other solutions in the future.

Yes, AndrewT was frequent in these threads and he was using a DCB1. He had also built it for friends as he had mentioned. R.I.P.
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Old 12th April 2018, 05:19 PM   #5753
stajo is offline stajo  Sweden
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Salas hotrodded blue DCB1 build
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R.I.P.
How sad. Didnt know.
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Old 14th April 2018, 04:11 AM   #5754
sthcoaster is offline sthcoaster  New Zealand
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Salas hotrodded blue DCB1 build
Default 2sk170 matched pairs

I have read near the beginning of the thread that the lower of the matched pairs should go to the middle.

But as I have 2 pairs of identical closely matched pairs (at least that is what they are labelled and I have not measured them myself) to get the best result should I keep the identical pairs together or swap so that I have 2 pairs that are the same?

(reading across the quad)

7.85 - 7.85 - 7.84 - 7.84

or

7.85 - 7.84 - 7.84 - 7.85

I think I read that the identicals should remain together rather than make similar pairs ? but can't now find that post.

Thanks in advance
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Old 14th April 2018, 04:40 AM   #5755
dewdrop is online now dewdrop  Singapore
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Default Do we need to use a CL-60?

Do we need to use a CL-60 to connect the audio ground to the earth ground like the other Pass amps? TIA
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Old 14th April 2018, 08:51 AM   #5756
Salas is offline Salas  Greece
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Originally Posted by sthcoaster View Post
I think I read that the identicals should remain together rather than make similar pairs ?
Correct, keep the identical ones together
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Old 14th April 2018, 08:52 AM   #5757
Salas is offline Salas  Greece
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Do we need to use a CL-60 to connect the audio ground to the earth ground like the other Pass amps? TIA
Could use one, yes. But not strictly having to.
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