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Ultralow Noise Amplifier (Patreon)

Published:
2020-08-16 20:33:27
Imported:
2026-06
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Content

Not sure what happened here 🤭 this project started as 'ts80p.prproj' but the soldering iron didn't offer a whole lot of talking material. So instead I started rambling about noise ... for 25 minutes ...

Files

Previews only

Ultralow Noise Tester: 9V Battery vs. 7805 vs. LTZ1000

Try JLCPCBs infamous prototyping services: https://jlcpcb.com/ TS80P Soldering Iron Banggood https://bit.ly/312l2ER Microscope I used to film https://www.welectron.com/Andonstar-AD407-Digital-Microscope Behind the scenes sometimes https://www.patreon.com/marcoreps Linear AN124 https://www.analog.com/media/en/technical-documentation/application-notes/an124f.pdf KiCAD project https://github.com/marcoreps/low_noise_amplifier EEVBlog Forum thread https://www.eevblog.com/forum/metrology/diy-low-frenquency-noise-meter/ Vintage German Hermetic Tantalum Caps https://www.ebay.com/itm/361575306139 0:00 Intro 2:02 Circuit Design 4:12 PCB & Assenvky 8:13 TS80P 9:58 Input Cap Problems 15:56 Input Cap Solutions 18:01 Lame results 22:23 Cool results

Comments

Marc Boivin

Can't wait to see an Electronic OCD like you walk us through hand soldering surface mounts!

marcoreps
>>42355987

Based on my display of expertise here? 🙈 I bet others could do that a lot better

Marco Vujevic

Until today I always thought that "Unleash the hounds!" was a cool line, but from now on, the best shall always be "Deploying Dogs!"

Faraz Sadrzadeh

What happened to OSMU? You took it off your GitHub. I was following that project so hard

marcoreps
>>42413229

It got even more ambitious than I originally wanted it to be 😅 It's a team effort now, happening mostly on the discord server. It'll take a lot longer, but it will be worth it. This power output stage is one of multiple candidates we are considering https://github.com/marcoreps/lt1166_bob

Rush Robbins

Lots of KiCad showing up! Didn't you use EAGLE before? What brought you over? :)

marcoreps
>>42454759

Yeah, EAGLE was okay years ago. Now it feels like 10 new shiny UI layers on top of fundamental code from 1988

Nikolaus Juch

You could use a two stage design for your amplifier, you can dimension the first stage that even with the worst leakage current of you cap you don't hit the supply rails and then use a second dc block with a higher gain amplifier afterwards that way you won't have that much leakage anyways because you've got a lower dc bias 🤔

Nikolaus Juch
>>42760355

A colleague of mine built a low noise amp which goes down to 1/10Hz and he didn't use any fancy tantalum caps so maybe you can do the same 😉

marcoreps
>>54740024

Seen it! A very sophisticated solution whereas I am just relying on good opa performance :)