The potential advantage is that a typical 10514 using discrete diodes is
about 6dB quieter than a typical RPD-1 using a monolithic quad in the
flicker noise region.
Bruce
Bob Camp wrote:
Hi
You often see reels of parts on the auction sites at crazy prices. Somebody
scrapped out a through hole pick and place loader and is selling off the
inventory that was still in place. I've often though the one could get lucky
and find a reel of rational diodes without spending a lot of money on them.
Setting up to do the basic sort is definitely "basement compatible" sort of
stuff. The tail end of the process would be to drop candidate quads into a fixture and
see how they actually do in a real mixer. Still something you could do in the basement.
The transformers you would wind are going to be a lot bigger than the ones
MiniCircuits uses. I don't think that would be a problem in any most time nut
basement settings.
Bob
On Mar 27, 2010, at 12:34 PM, Magnus Danielson wrote:
Ulrich Bangert wrote:
It's not real clear that building a part with monolithic diode pairs or quads
buys much over a part from MiniCircuits.
Rumours are that the famous HP10514 is made from 4 discrete hand selected
diodes. If you have thousands of diodes to select from building your own
mixer may give sense.
Well, the HP10514 does have 4 individual diodes. Selection is certainly being
done.
Using selection for other home-built stuff is done regularly in the Synth-DIY
world, so it is not too hard to do. Modern mixers use either the same die or at
last dies from the same place of the wafer to accomplish close matching.
Cheers,
Magnus
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