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

UGS MUSES Scion Preamplifier.
UGS MUSES Scion Preamplifier.
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Old 7th September 2019, 09:36 PM   #161
Oneminde is offline Oneminde  Sweden
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Join Date: Jun 2014
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I might end up adding a Triode stage for myself at least. I will be able to switch between the FET and Triode gain stage on the fly... No point in fighting against something a FET cannot do, replace the triode. There is a place for both FET and Triodes and having the ability to choose is the perfect solution.
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Old 21st September 2019, 08:35 PM   #162
Oneminde is offline Oneminde  Sweden
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Default UGS4 Schematic.

Its been quiet for a while, been working on a few things, including the UGS4 schematic. While I am working the UGS4 PCB, I thought i would share the schematic with you. There should be no need for any changes, but who knows - so enjoy.

Oneminde
Attached Files
File Type: pdf PASS UGS4 V1.0 Schematic.pdf (52.5 KB, 96 views)
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Old 21st September 2019, 10:35 PM   #163
Oneminde is offline Oneminde  Sweden
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Default UGS4 V1.1

A slight update, header added.
Attached Files
File Type: pdf Schematic UGS4_V1.1.pdf (54.5 KB, 71 views)
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Old 21st September 2019, 11:40 PM   #164
Oneminde is offline Oneminde  Sweden
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UGS4 V1.1 has wrong pin connections - I was tired - so discard this one. I will upload the edited version tomorrow.
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Old 22nd September 2019, 03:48 PM   #165
Oneminde is offline Oneminde  Sweden
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Default UGS4 V1.1b

This one uses 2x10 pin header and some of the pins are tied together. GND is present in both headers. All the nets are cleared so no errors. All values are correct. So to my knowledge, UGS V1.1b is correct. Some minor differences exist in the connection at the headers, but that should not matter for the function. Now I need to start working on the PCB, so wish me good luck

B is feedback and will be placed on the motherboard. This portion needs to be tested.

Oneminde
Attached Files
File Type: pdf UGS4_V1.1b Sch.pdf (65.5 KB, 98 views)
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Last edited by Oneminde; 22nd September 2019 at 03:52 PM.
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Old 24th September 2019, 11:36 PM   #166
Adams_Leo is online now Adams_Leo  China
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Quote:
Originally Posted by Oneminde View Post
This one uses 2x10 pin header and some of the pins are tied together. GND is present in both headers. All the nets are cleared so no errors. All values are correct. So to my knowledge, UGS V1.1b is correct. Some minor differences exist in the connection at the headers, but that should not matter for the function. Now I need to start working on the PCB, so wish me good luck

B is feedback and will be placed on the motherboard. This portion needs to be tested.

Oneminde
did you try floating ground base for the Q1/Q2/Q3/Q4?
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Old 24th September 2019, 11:46 PM   #167
Oneminde is offline Oneminde  Sweden
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Quote:
Originally Posted by Adams_Leo View Post
did you try floating ground base for the Q1/Q2/Q3/Q4?
Hi. No I did not. The official UGS4 does not use floating design, so I will not use it in this reissued version either. I might explore that in another version but it will probably not be released for the official kit. Anyone is free to redesign the UGS4 as they please

I am also on V1.1c which is the basis for the PCB that I am currently designing. Some minor sch. changes but not much. This version including the PCB layout will be uploaded once I am done and will be open for collective remarks in terms of important flaws should there be any. It will come together with UGS4x which will be available as an option for does who are interested

Oneminde
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Old 24th September 2019, 11:52 PM   #168
Adams_Leo is online now Adams_Leo  China
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Quote:
Originally Posted by Oneminde View Post
I am also on V1.1c which is the basis for the PCB that I am currently designing.

Oneminde
looking forward your new version
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Old 29th September 2019, 12:49 PM   #169
Oneminde is offline Oneminde  Sweden
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Join Date: Jun 2014
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Default The Heart and Soul.

Click the image to open in full size.

I started last weekend not knowing how to do proper schematics and PCB design, this was something "magical" others are able to do, but not me. But with some persistency and a pinch of determination, anything is possible. So here we are with the heart and soul of the UGS MUSES Scion preamplifier. We are now officially leaving behind the UGS used in the prior versions and entering an era of using an official PASS LABS UGS gain stage. Spite it being a few years old, it now uses MOSFETs at the output instead of BJTs. It also feature 1206 SMD resistors like I wanted.

As you can see, there are two versions of this gain stage. The normal UGS4 which use the standard TO-92 style JFets... for the hardcore Toshiba 2Sk170/2SJ74 users. For does who are a bit more adventitious there is the SOT-23 version called UGS4x which uses surface mount and N-Chn only, so no need for complimentary N- & P-Chn JFets. Designing the SOT-23 card also future-proof's the preamplifier for when the market run out of the original Toshiba JFets. I will do tests with both cards and report back.

With the gain stage designed, I can now move on to the motherboard, PSU and MCU portion of the preamplifier.

Oneminde
Attached Images
File Type: jpg The heart and soul.jpg (469.0 KB, 228 views)
Attached Files
File Type: pdf Schematic UGS4 V1.1c.pdf (68.5 KB, 73 views)
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Last edited by Oneminde; 29th September 2019 at 12:52 PM.
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Old 29th September 2019, 03:10 PM   #170
Oneminde is offline Oneminde  Sweden
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Just found this Logic Analyzer which is hooked up to a PC - will come in handy when I debug the MCU.

Mini Saleae 16 Logic Analyzer USB

Oneminde
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