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

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

TDA1541A Diy Pcb - "Distinction-1541 v2"
TDA1541A Diy Pcb - "Distinction-1541 v2"
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 12th January 2018, 09:30 PM   #401
ryanj is offline ryanj  Australia
EE Hack
diyAudio Member
 
ryanj's Avatar
 
Join Date: Jul 2010
Location: Seaford
TDA1541A Diy Pcb - "Distinction-1541 v2"
You're welcome!

  Reply With Quote
Old 13th January 2018, 04:14 AM   #402
JOHNNYCR100 is offline JOHNNYCR100  Abu Dhabi
diyAudio Member
 
Join Date: Jul 2010
Location: Middle East someware!
Hi Ryanj,

Blatant newbie question coming up!!

Sorry to bother yet again, i would like a passive I to V converter with Rhopoint resistor, however there seem different opinions about the value of such an item, as there quite expensive, can you give me a definitive (or best ball park) resistance value i should order for best results (min distortion/best gain?)- and.........
I also have a Lampizator SRPP PCB and assume that the same value resistor would be OK to feed that (if you are familiar with the Lampa SRPP PCB?)

Thank you for your patience here, i do appreciate it.

Best regards

Johnny
  Reply With Quote
Old 14th January 2018, 01:10 AM   #403
wlowes is offline wlowes  Canada
diyAudio Member
 
wlowes's Avatar
 
Join Date: Mar 2007
Location: Toronto
I will defer to Ryan as the expert, but offer my experience for consideration. I have run several Lampizator/1541a rigs. As you know he advocates 100r as the optimum value for the I/V resistor. I used 100r for some time and it is fine. As he says, it produces a sharper edgier sound vs lower values. I saw arguments for something more like 60r as a lower distortion 'optimum' value. I now use a DIY manganan IV resistor at 60r feeding a point to point wired Lampizator circuit. I think the sound is excellent feeding my objective of relaxed clean 'in the room' sound. I believe a hand wound manganin resistor is functionally equivalent to the Rhopoint. It certainly mopped the floor with every other resistor I tried including vintage AudioNote and Caddock TF - UFS series. I think the solution to your decision could be to use less expensive IV resistors at values between 50r and 100r. When you decide what value suites your objectives best, swap in that value of the Rhopoint. It will let your preferred sound shine through without the distortion of lessor resistors.
I know they are expensive but consider using the Rhopoint for the other resistors in the Lampizator circuit. I believe they are 200r in my circuit. The manganins made an equal jump in sound quality improvement there as they did with the I/V.
  Reply With Quote
Old 14th January 2018, 05:33 AM   #404
JOHNNYCR100 is offline JOHNNYCR100  Abu Dhabi
diyAudio Member
 
Join Date: Jul 2010
Location: Middle East someware!
Default Resirtor I/V values

Hi Willows,

Thank you for the reply, i had around 50 to 60 ohms in mind, but don't have any test equipment, when i get my act together i will experiment around with basic resistors , but the validation of the Rhopoint is appreciated.

Best regards
Johnny
  Reply With Quote
Old 14th January 2018, 05:52 AM   #405
sumotan is online now sumotan  Indonesia
diyAudio Member
 
Join Date: Oct 2013
Hi Johnny
May I suggest you try out the Mills wire wound. Gives you a closer taste of wire wounds before jumping to Rhopoints.

Cheers
  Reply With Quote
Old 14th January 2018, 07:15 AM   #406
JOHNNYCR100 is offline JOHNNYCR100  Abu Dhabi
diyAudio Member
 
Join Date: Jul 2010
Location: Middle East someware!
Talking Mills resistors.

Hi Again Sumotan,

Thank you for the suggestion, mill are not to expensive, so i think ill try them as well as the expensive Rhopoints.---- what can go wrong

let you know when ordered tested (must get a distinction PCB first!)

Best regard

Johnny
  Reply With Quote
Old 14th January 2018, 07:16 AM   #407
ryanj is offline ryanj  Australia
EE Hack
diyAudio Member
 
ryanj's Avatar
 
Join Date: Jul 2010
Location: Seaford
TDA1541A Diy Pcb - "Distinction-1541 v2"
Hi Johnny,

The Rhopoints are well worth the money, to me they sounded better than those naked vishay resistors, and were a bit better than some CuNi44 wire that I used to make up some honeycombe wire wound resistors. If your using the SRPP I think I used 100R, and it sounded good at this value, as Walter said, you will achieve lower distortion the lower in value you go. At the moment for my output stage (CEN/current conveyor) im using 1k5 Rhopoints and am very satisfied with them. You might want to go the option of what sumotan suggests first to get a feel for the sound difference in using different IV resistors, they all sound different.

Have fun with it.

Ryan
  Reply With Quote
Old 14th January 2018, 08:27 AM   #408
JOHNNYCR100 is offline JOHNNYCR100  Abu Dhabi
diyAudio Member
 
Join Date: Jul 2010
Location: Middle East someware!
Default Resistor values/types

Hi ryjan,

Thanks for the info, Rhopoints seem to be the preferred resistor, but as previously stated, why not tried some Mills? (wont cost much)
just play around between 60 and 100 Ohms till bliss kicks in?-- now to get some cash

Much thanks for all your help

Johnny
  Reply With Quote
Old 14th January 2018, 10:26 PM   #409
wlowes is offline wlowes  Canada
diyAudio Member
 
wlowes's Avatar
 
Join Date: Mar 2007
Location: Toronto
You will enjoy these resistor experiments. FYI, I wrote a short blog concerning my fun in this regard.
2013 Holiday Projects - Ridding the system of resistor problems - diyAudio
Later I also changed the cathode resistors to Manganin and realized equal benefits. Values of all are in the attached schematic.
For fun I attach a pic of the circuit wired pt to pt. The white blobs are the hand made resistors. Not pretty, but sound is sublime.

I came to the conclusion that all resistors near the signal path are evil and should be eliminated where possible and replaced with least damaging element which to my experience is manganin. I believe this is what Rhopoint uses as their resistive element.
Attached Images
File Type: jpg 20150301_101739.jpg (544.4 KB, 113 views)
File Type: jpg 20150301_181158.jpg (805.6 KB, 111 views)
  Reply With Quote
Old 15th January 2018, 04:18 AM   #410
sumotan is online now sumotan  Indonesia
diyAudio Member
 
Join Date: Oct 2013
Diy resistor of low value sounds like fun but if value goes into K !!!!!!!
Someone should do a shoot out between big bucks Rhopoint vs Mills Mra.
For all you know the difference may not be as great as their price difference.
  Reply With Quote

Reply


TDA1541A Diy Pcb - "Distinction-1541 v2"Hide 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
Distinction-(TDA)1541 Build Thread Eldam Digital Line Level 125 10th August 2015 09:13 PM
Randy Slone's "Fig 11.4" (Self's "Blameless"?): PCB layout tcpip Solid State 128 23rd September 2013 04:45 PM
TDA1541A "piggybacking" on analog metric pcb? Mayday Digital Source 43 4th June 2012 08:55 AM
Looking for Energy Veritas V1.8 (6-1/2") or V2.8 (8") Woofers dtm1962 Swap Meet 5 10th January 2010 06:49 PM


New To Site? Need Help?

All times are GMT. The time now is 12:54 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki