Morethanall connectors not in stock but I submitted an inquiry. It sounds like they are an OEM looking for large quantities so may not get a good answer. For DIY, JST/Molex/etc and standard panel mount jacks are just fine.
Do we have an option to get four more inputs? What would be the consequence of making a pin header to plug in a second tier daughtercard of inputs above the ones on the board?
I think if JPS64 designed a new input selector panel with 8inputs it could use same header pin cable. Otherwise, I don’t see how what you say could work. Maybe draw a schematic or redline the existence MB schematic?
I couldn't pass up the opportunity for some late night eBay / AliExpress sleuthing...
From what I can tell from comparing the morethanall.com and Hifi Collective CAD, these appear to be the same connectors as the much more readily available right-angle mounted jacks.
The best CAD of the right-angle variant I could find is on AliExpress at Taiwan GIGABAD plate welding BNC turntable DAC decoder digital coaxial input and output PCB instal special copper RCA socket-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group.
Looking at the CAD and the pictures on that page, it appears that it is only a matter of bending the pins straight and repositioning the pins from the bottom holes to the rear holes (I've see pictures with the rear holes both drilled and not drilled). This of course assumes that the pins are just press fit, but I would be surprised if they were not.
The right-angle version are available at around $2.66 each: Taiwan-made gold-plated RCA turntable DAC decoder digital coaxial PCB board sock | eBay. Given the price difference, it might be worth giving it a DIY try.
Using on main system now
I connected the Aksa Lender preamp to my new Pass Aleph J amp that I just finished building. The Aleph J is driving my ScanSpeak 10F/8424 & Dayton RS225-8 FAST speakers (fitted with transient perfect XO). The combination sounds amazingly dynamic and lifelike. Super clarity - so yes, the choice of preamp makes a difference with some power amplifiers. I will listen long term now. Initial impressions from the Eric Clapton "Unplugged" CD is very very good. That recording has a very high dynamic range and is ambient recorded with minimal post-production I think. Anyhow, I am quite certain that you will all be very pleased and blown away by the sound quality of the preamp.
I connected the Aksa Lender preamp to my new Pass Aleph J amp that I just finished building. The Aleph J is driving my ScanSpeak 10F/8424 & Dayton RS225-8 FAST speakers (fitted with transient perfect XO). The combination sounds amazingly dynamic and lifelike. Super clarity - so yes, the choice of preamp makes a difference with some power amplifiers. I will listen long term now. Initial impressions from the Eric Clapton "Unplugged" CD is very very good. That recording has a very high dynamic range and is ambient recorded with minimal post-production I think. Anyhow, I am quite certain that you will all be very pleased and blown away by the sound quality of the preamp.
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I just saw mention of the OEM (AEC connectors), looking at the drawings available on their site, it seems even more likely that they are the same product, just configured differently: straight vs. right-angle.
I linked to them on eBay in my previous post: http://www.diyaudio.com/forums/anal...ender-preamp-40vpp-output-39.html#post5284202.
Despite being from Aliexpress/China/Taiwan and the incorrect 90deg version... they are still $10ea! The one on eBay was more resonable at $3ea. I am not sure if they can be converted to 0deg from the stock 90deg config.
The multiple JST connectors with leads to panel mount RCA' s may still be the way to go, albeit, quite a bit more work. However, drilling all those holes precisely to fit 10 RCA hard mount jacks could be a challenge.
The multiple JST connectors with leads to panel mount RCA' s may still be the way to go, albeit, quite a bit more work. However, drilling all those holes precisely to fit 10 RCA hard mount jacks could be a challenge.
Is there a guide to selecting R148 and R151 based on the V+? What did you end up using X? And remind me what your V+ was, for reference?
Also, looking at substituting this inductor for L161 so I don't have to source from Farnell. Thoughts?
2105-V-RC J.W. Miller | Mouser
Also, looking at substituting this inductor for L161 so I don't have to source from Farnell. Thoughts?
2105-V-RC J.W. Miller | Mouser
And the Vishay IRF610 is on backorder until February. Can this be substituted?
FQP4N20L ON Semiconductor / Fairchild | Mouser
FQP4N20L ON Semiconductor / Fairchild | Mouser
Not sure where R151 is? I used 15k for R148 for Vcc of 45v to 48v that’s about 3mA through the LED. Could use 22k even.
The CLC filter is optional and I do not see it is needed in clean mains areas. The DC to DC step up actually has a CLC as part of the circuit and blocks mains RF spurious noise nicely. Coilcraft might have something like toroidal ferrite choke with about 1mH and passing 200mA DC should work.
Any n channel TO220 mosfet capable of 1amp should work fine. IRF510/540 etc. IRF610 is such a common part can’t believe they are out. That FQP should be perfect.
I think R151 is on the filter board. Thanks for the tips on the other parts. I thought it was strange they were out of the IRF610 as well.
MELF SMT build works well. Please make sure to use v2 of the schematic as R2 and R3 are reversals on v1.
This was done with solder paste and stencil and a hot plate:
Preamp sounds great as expected. Standard PCB header pins cannot be reflow soldered (plastic melts).
This was done with solder paste and stencil and a hot plate:
Preamp sounds great as expected. Standard PCB header pins cannot be reflow soldered (plastic melts).
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