Go Back   Home > Forums > > >

Twisted Pear Superior quality electronic kits

Reply
 
Thread Tools
Old 6th January 2021, 04:34 PM   #331
pixelpusher is offline pixelpusher  United States
diyAudio Member
 
Join Date: Oct 2004
Location: Minneapolis
I used Jan Didden’s “Silent Switcher” power supply. It’s available here at the DIY Audio store
  Reply With Quote
Old 7th January 2021, 08:24 AM   #332
Cyberkul is offline Cyberkul  Norway
diyAudio Member
 
Join Date: Oct 2008
Thanks! Will have a look👍
  Reply With Quote
Old 5th September 2021, 04:23 PM   #333
thematikma is offline thematikma
diyAudio Member
 
Join Date: Nov 2016
Default Input Voltage?

Quote:
Originally Posted by pixelpusher View Post
I used Jan Didden’s “Silent Switcher” power supply. It’s available here at the DIY Audio store
I will also use the silent switcher for the Lo Z version. What input voltage did you use? I am concerned 150mA per rail (when using 5V input) could be a bit on the short side.

Thanks!
  Reply With Quote
Old 6th September 2021, 05:15 AM   #334
pixelpusher is offline pixelpusher  United States
diyAudio Member
 
Join Date: Oct 2004
Location: Minneapolis
I am using a 5 volt regulated wall wart. No problems.
IIRC, my Retro measured around 35 mA going into the BPBP. Current usage varies with the input impedance of your preamp. I don’t recall the exact input impedance of the BPBP but it is on the high side. I’m thinking around 100k.
  Reply With Quote
Old 7th September 2021, 08:00 AM   #335
thematikma is offline thematikma
diyAudio Member
 
Join Date: Nov 2016
Thanks, that helped a lot. I do have 20kOhms input impedance, so current draw should be slightly higher in my case. I guess I'll just measure when everything is ready.
  Reply With Quote
Old 27th September 2021, 12:41 AM   #336
thematikma is offline thematikma
diyAudio Member
 
Join Date: Nov 2016
I had ordered the Retro kit some time ago and finally finished my build yesterday. It really sounds amazing and the kit was so nice arranged, with every part marked and separated per channel. A huge thanks to Twisted Pear Audio for that!
I have a small issue, what is not related to the Retro, but my record player. It happens only to my diy phono pres. Hum! I have my rega Planar 10 modified with separately wired ground. It is located approximately 30cm away from mains equipment. If I move it further away, the hum (it sounds like ac transformer noise) gets attenuated. With the pres I did buy ( SPL Phonos, EAT eglo perit) there is no hum at all. What do manufacturers implement, to make their units immune to hum?
I do at least think, the tonearm wires or the arm itself is picking that up link an antenna. I also tried the cartridge floating and a wire from mains earth to ground, what did not help. Only if I unplug the player from the pre, the hum is gone.

Any clues are much appreciated. Moving everything further away from each other is not really an option, as my space is really limited. Maybe rewire the arm and use XLR plugs would also help?
Thanks!
Attached Images
File Type: jpg PXL_20210926_000333383.jpg (982.6 KB, 90 views)
File Type: jpg PXL_20210926_000250902.jpg (1,002.6 KB, 85 views)
  Reply With Quote
Old 30th September 2021, 03:47 PM   #337
pixelpusher is offline pixelpusher  United States
diyAudio Member
 
Join Date: Oct 2004
Location: Minneapolis
Pin 1 of the XLR should go directly to the chassis and not be connected to anything else.
  Reply With Quote
Old 1st October 2021, 11:48 PM   #338
thematikma is offline thematikma
diyAudio Member
 
Join Date: Nov 2016
Thanks again for your input. Based on suggestion, I did a little research, reading AES48 and "Pin 1 prroblem" bits. So I decided to connect pin 1 direct to the chassis near the input/output and made a star ground, where I tied all circuitry gnd to another place further away to the casing.
But the outcome is the same. Dead silent without the record player connected, and hum when the leads are plugged. I suspect the rega plugs and cable acting as a antenna.
So I will either relocate my stuff connected to mains supply, or rewire my tonearm to xlr, hoping the common shield will get rid of the hum.
  Reply With Quote
Old 2nd October 2021, 02:47 PM   #339
pixelpusher is offline pixelpusher  United States
diyAudio Member
 
Join Date: Oct 2004
Location: Minneapolis
Try lifting that ground. Hum is usually caused by ground currents.
  Reply With Quote
Old 2nd October 2021, 03:06 PM   #340
mbrennwa is offline mbrennwa  Switzerland
diyAudio Member
 
mbrennwa's Avatar
 
Join Date: Mar 2005
Location: Zurich, Switzerland
Retro - A fully symetrical phono stage with RIAA filter
Can you make a drawing of your audio connections, ground connections, and earthing to the wall sockets?
  Reply With Quote

Reply


Retro - A fully symetrical phono stage with RIAA filterHide this!Advertise here!
Thread Tools

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
RIAA Phono Amp Design Sheldon Tubes / Valves 58 26th August 2019 03:07 PM
how build usb phono pre riaa tekton364 Analogue Source 2 28th September 2007 08:50 PM
WTB: RIAA Phono Stage mrdon Swap Meet 1 19th July 2007 04:00 AM
RIAA phono stage KevinTams Tubes / Valves 10 16th May 2005 01:05 PM
ls-37 MM/MC RIAA Phono Amp from diyclub.biz wuffer Tubes / Valves 2 13th November 2004 04:12 PM


New To Site? Need Help?

All times are GMT. The time now is 10:03 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 13.64%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki