Search found 9 matches

by quattro64
Sat Jul 07, 2018 3:22 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System Construction Information

I definitely will, in a couple of weeks or so, thanks again.
by quattro64
Sun Jul 01, 2018 10:24 am
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System Construction Information

ok, thanks!
by quattro64
Sat Jun 30, 2018 5:39 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System Construction Information

I noticed on the schematic for flat phono that the R4, R5 are optional? Just wondering what the purpose of these Rs are? I've currently placed some 500R prps in those spots, should I just jump them instead?
by quattro64
Fri Jul 21, 2017 7:43 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System

Thanks, I will be leaving 2 channels as is to experiment, the others I modded with the 47uf caps. Whichever one sounds best will win so no switches. Also it is quite easy to use the 'schematic for standard op amps' in the pcm4222 pdf to bypass its front end completely and roll op amps, or use transf...
by quattro64
Tue Jul 18, 2017 5:09 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System

After reading through the pcm4222evm thread I see that without the caps the opamps are forced to run in class A bias. Due to the dc they're required to sink? Anyway I might like that, at least to try it out. Maybe set it up on a switch. Seems there is more input R on the pcm4204evm compared to the p...
by quattro64
Mon Jul 17, 2017 2:54 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System

Cool, I'll start with these and then let you know how it goes. Thanks again! :D
by quattro64
Mon Jul 17, 2017 11:22 am
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System

Thanks, 1k is low so yes I will start with 47uf, impedance mismatch shows up in either rolled off highs or no bass, I'll experiment if 47uf doesn't work. I have a bunch of 47uf 16v, will those work? So the plan is to jump the c4-c5, c24-c25 on the MM then remove any jumpers or Rs on the evm and repl...
by quattro64
Sun Jul 16, 2017 10:18 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System

Thanks!, I'm glad you are familiar with these EVMs. I looked at the pcm4204evm guide and the schematic shows the currently blank spots for the possible caps. It looks like it wants electrolytics. Could film caps work? This is for dc blocking, correct? Schema also shows an R in parallel with the cap....
by quattro64
Sun Jul 16, 2017 4:57 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 101
Views: 94353

Re: Phono Transfer System

Hello, finally getting my build completed, Will be using as stand alone to feed a pcm4204evm adc. My phono leads are true balanced as shown in this thread though so I wonder, do I need to populate c4-c5 c-24 c-25? What value and voltage for those caps? Thanks!