In respect of Wayne, Nelson and PASSDIY's intellectual property will sell the boards at cost and post the Gerbers and BOM here. Wayne and Nelson have contributed so much to our enjoyment of sound I think that's fitting!
I want to validate it first, however.
Almost all the passive parts are 0805, save for some of the caps which SYN08 had recommended -- these are acrylic and a bit larger and more expensive.
Output stage works like a champ! +40dB on the nose. Comparing the SPICE models for the through hole and surface mount output MOS are identical.
The passive RIAA network -- will need careful selection of components as it's time consuming tweaking SMD. I might even go for through-hole components.
I used a 270 degree SMD trimpot, this will have to be changed out to a multi-turn trimpot.
The passive RIAA network -- will need careful selection of components as it's time consuming tweaking SMD. I might even go for through-hole components.
I used a 270 degree SMD trimpot, this will have to be changed out to a multi-turn trimpot.
What kind of IDSS matching did you get between the LSK389 SOIC8 devices from NAC?
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Darned good, each half of the '389 +/- 0.1mA Idss.
but don't forget that in practice, each NJF has its own source resistor which could be trimmed
gfs of the LSK389 seems lower than the K170's however.
How about between each package for the four input Jfets. How many would you need to purchase to get adequate matching.
Looking forward to this project.
Looking forward to this project.
If memory serves correctly, the 170s which I got from the with the boards were within 1mA Idss. On the board I am playing with, the Idss are a bit tighter than this, Vgs fsior the
Of course, I have two boards in mind, one with the LSK389B and the other with the LSK710B. You can buy a tube of LSK170B if you like.
The point of the exercise is to use a board which minimizes mains pickup and retains the great qualities of the PASS design and put it in the public domain.
Of course, I have two boards in mind, one with the LSK389B and the other with the LSK710B. You can buy a tube of LSK170B if you like.
The point of the exercise is to use a board which minimizes mains pickup and retains the great qualities of the PASS design and put it in the public domain.
Very interesting project. I also thought about (only thought about it) the use of dual JFets in a Pearlesque design. Thanks Jack for actually doing something about it!
I'm enjoying my Pearl 2 very much, but really, I need another! So subscribed and looking forward to more fun.
I'm enjoying my Pearl 2 very much, but really, I need another! So subscribed and looking forward to more fun.
I ordered 40 boards and the cost was $130, half were SOIC, half SOT23, so anyone who wants a set, $3.25 each, please let me know. Can probably ship via first class mail in the US and Europe.