Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

ThatMicPre - an open-source mic preamp
ThatMicPre - an open-source mic preamp
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th June 2020, 09:55 AM   #11
BamboszeK is offline BamboszeK  Poland
diyAudio Member
 
BamboszeK's Avatar
 
Join Date: Jun 2012
Perfectionism can be a curse Sometimes also I catch myself at overthinking circuits that seem to work perfectly already.
I can recommend those three papers:
http://www.ianbell.ukfsn.org/EzTubeM...nding101v2.pdf
Grounding and Shielding Audio Devices
Pin 1 Revisited
Phantom power and grounding are really tricky matters.

Still can't decide if its ok to "tie" enclosure and signal grounds with LED and resistor when SW1 turns phantom off.
Attached Images
File Type: png GND mic pre.PNG (81.2 KB, 49 views)
  Reply With Quote
Old 24th June 2020, 10:20 AM   #12
ojg is offline ojg
diyAudio Member
 
Join Date: May 2003
Location: Norway
ThatMicPre - an open-source mic preamp
Yes, and where to reference the 48V supply? GNDPWR or GND?
  Reply With Quote
Old 24th June 2020, 01:18 PM   #13
BamboszeK is offline BamboszeK  Poland
diyAudio Member
 
BamboszeK's Avatar
 
Join Date: Jun 2012
According to first paper it's best to reference +48V to enclosure GND.
Latest version of my whole schematics is in attachment. There is a jumper so I have a bit of flexibility. Depending on the results of measurements I can tie grounds or leave them unconnected. Now fun part begins - PCB layout.
I don't have much experience with isolated DC/DC converters but got suggestion that is better to connect them.

By the way - I can't find BOM, what's P/N of lever switches you used?
Attached Images
File Type: png MicPreFXLoop sch.PNG (217.2 KB, 60 views)
  Reply With Quote
Old 24th June 2020, 01:37 PM   #14
ojg is offline ojg
diyAudio Member
 
Join Date: May 2003
Location: Norway
ThatMicPre - an open-source mic preamp
BOM is in the plots folder.

Switches are 200MDP1T2B2M6QE

That's a promising schematic. I have some tips for you if you start your own thread ;-)
  Reply With Quote
Old 24th June 2020, 06:00 PM   #15
BamboszeK is offline BamboszeK  Poland
diyAudio Member
 
BamboszeK's Avatar
 
Join Date: Jun 2012
Oh right, my bad. Thank you.
If you want to generate pretty BOMs in KiCad I can recommend you that plugin - KiCad Interactive HTML BOM Plugin Demos | InteractiveHtmlBomDemo

Tips are of course always welcome - Balanced microphone preamplifier with effect loop
  Reply With Quote
Old 25th June 2020, 07:38 AM   #16
ojg is offline ojg
diyAudio Member
 
Join Date: May 2003
Location: Norway
ThatMicPre - an open-source mic preamp
Wow, that BOM tool looked really nice, thanks for the tip! I'll look into adding it to my project.
 

Reply


ThatMicPre - an open-source mic preampHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[Open source] TINA The total open source Audiophile Player based on Beaglebone Black DragonWar PC Based 7 18th December 2016 02:31 PM
Ultimate Open Source XMOS USB-I2S: The source to end all sources. krfkeith Digital Source 4 14th June 2013 03:54 PM
Volume / Source selector - open source project ? AuroraB Analog Line Level 22 22nd September 2012 02:21 PM
Open call for suggestions on Open Source DIY Audio Design gfergy Everything Else 1 15th April 2007 07:33 AM
Open Source, Open Architecture! zenmasterbrian Digital Source 185 23rd February 2007 10:35 PM


New To Site? Need Help?

All times are GMT. The time now is 10:41 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki