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

AKSA's Lender Preamp with 40Vpp Output
AKSA's Lender Preamp with 40Vpp Output
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Old 22nd December 2017, 05:28 AM   #391
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
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Originally Posted by gtose View Post
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.
Where can you get them though?
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Old 22nd December 2017, 05:42 AM   #392
gtose is offline gtose  United States
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AKSA's Lender Preamp with 40Vpp Output
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Where can you get them though?
I linked to them on eBay in my previous post: AKSA's Lender Preamp with 40Vpp Output.

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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.
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Old 22nd December 2017, 02:05 PM   #393
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
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.
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Old 27th December 2017, 04:49 PM   #394
Algar_emi is offline Algar_emi  Canada
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AKSA's Lender Preamp with 40Vpp Output
Received my PCB set, quite nice. Thanks
SB
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Old 27th December 2017, 09:59 PM   #395
jwjarch is offline jwjarch  United States
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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?
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Old 27th December 2017, 11:06 PM   #396
jwjarch is offline jwjarch  United States
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And the Vishay IRF610 is on backorder until February. Can this be substituted?
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Old 28th December 2017, 12:51 AM   #397
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
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Originally Posted by jwjarch View Post
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
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.
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Old 28th December 2017, 05:32 AM   #398
jwjarch is offline jwjarch  United States
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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.
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Old 1st January 2018, 07:04 PM   #399
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
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:
Click the image to open in full size.

Preamp sounds great as expected. Standard PCB header pins cannot be reflow soldered (plastic melts).
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Last edited by xrk971; 1st January 2018 at 07:06 PM.
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Old 1st January 2018, 07:14 PM   #400
Nico Ras is offline Nico Ras  South Africa
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Very nice board layout XRK971
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