ok ,son in the input ground and in is swopped on the silkscreen.
But I am not sure i understand what is going on with those two 50R resistors?
But I am not sure i understand what is going on with those two 50R resistors?
Yes , but in the drawing it seems like you must not populate both but on 50R across the two ??
I guess nothing changes and only 2 must be populated?
I guess nothing changes and only 2 must be populated?
changes?
I'm starting to feel uneasy about this board. Is there anyway we can have all the changes/problems/answers in one message?
I'm starting to feel uneasy about this board. Is there anyway we can have all the changes/problems/answers in one message?
ME too
but so far I am building a file with a full parts list and also a list of errors.
I ordered all my parts today so early next week i will assemble.
Obviously I will assemble the power supply first.
On the previous page you can see the errors I found with the ref designators of the power supply. When I populate the parts I will double check everything and try and make a post with all my findings so that we all have one place with all the errors.
I will post my bill of materials ,it might help some people.
Note also. I did not go for the VERY expensive silver Mica capacitors.
I am going to build mine according to the RIAA circuit of the original schematic.
using 100nF and 33nf caps.
Hi-end phono preamplifier
but so far I am building a file with a full parts list and also a list of errors.
I ordered all my parts today so early next week i will assemble.
Obviously I will assemble the power supply first.
On the previous page you can see the errors I found with the ref designators of the power supply. When I populate the parts I will double check everything and try and make a post with all my findings so that we all have one place with all the errors.
I will post my bill of materials ,it might help some people.
Note also. I did not go for the VERY expensive silver Mica capacitors.
I am going to build mine according to the RIAA circuit of the original schematic.
using 100nF and 33nf caps.
Hi-end phono preamplifier
You mean the parallel R32a and R50a, I think Qaung Hao have let a spare
for????, perhaps additional cap...
no not talking about parallel
the way he has the 50R over the two resistors in series makes it confusing. don't worry , it's probably just me. Fact is you need to populate 4 x 100r to get 50r per side.
the way he has the 50R over the two resistors in series makes it confusing. don't worry , it's probably just me. Fact is you need to populate 4 x 100r to get 50r per side.
Information about the value of Phono D3A
Hello, the value of individual components in this diagram as phono 4. But Andrea has calculated value, and I did a comparison between them, the new value shows better, so the new diagram below. All the capacitors and resistors are not recorded values for an option in parallel. I'm sorry that was not clear for you to understand. Thanks
Phono 4 cricuit
Hello, the value of individual components in this diagram as phono 4. But Andrea has calculated value, and I did a comparison between them, the new value shows better, so the new diagram below. All the capacitors and resistors are not recorded values for an option in parallel. I'm sorry that was not clear for you to understand. Thanks
Phono 4 cricuit
Attachments
The zener diodes are all a bit flakey
I got 1n4742 as johngalt47 suggested
But this is a whole lot better.
I have another question.
In the quanhoa's design on the phono board R22 and R23 is 820k. But on the original design it is 1M. If i want to try the original riaa circuit should i use 820k or 1M? Or does it not matter?
I got 1n4742 as johngalt47 suggested
But this is a whole lot better.
I have another question.
In the quanhoa's design on the phono board R22 and R23 is 820k. But on the original design it is 1M. If i want to try the original riaa circuit should i use 820k or 1M? Or does it not matter?
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Hi Tang,
I´m not a krack in electronics, but if I understand it right, the 1M resistor is going into the RIAA network calculation.
Have a look at the Andreas side Audio Design Guide, there is on Phono 4 the calculator with the exact values, or ask Andrea himself.
Klaus
You are indeed correct!!!
Thanks man. That will teach me to ask questions and just blindingly trust other people. 😛
NO I can't keep it quanghao.
Thanks man. That will teach me to ask questions and just blindingly trust other people. 😛
NO I can't keep it quanghao.
klaju1955 , tangmonster
Audiodesign will answer you, when he comes back!
New the value and the circuit, i was sent to you, Audiodesign was calculate and i test 2 option, and i like new the value.
About the 1M//. or 820//. he like 2 x 820K( parallel)
Quanghao
Audiodesign will answer you, when he comes back!
New the value and the circuit, i was sent to you, Audiodesign was calculate and i test 2 option, and i like new the value.
About the 1M//. or 820//. he like 2 x 820K( parallel)
Quanghao
Despatch of replacement phono PCB
Hi Quanghao,
Have you any idea when you will despatch the replacement phono PCBs for those of us who have not received them yet?
Regards
John Caswell
Hi Quanghao,
Have you any idea when you will despatch the replacement phono PCBs for those of us who have not received them yet?
Regards
John Caswell
Hello!
The PCB is you do not get me very sad thing, and I'll send for you again. PCB hopes will hand to you, no destination Most PCB is not your phone number. I work with prestige, not profit. If you move to make sure, faster, and make sure to place it very expensive.
I've used
You did not get the PCB address please send me an e-mail with the following information:
Name:
Address:
Phone:
Nick DIY:
PCB name:
Extremely thank
The PCB is you do not get me very sad thing, and I'll send for you again. PCB hopes will hand to you, no destination Most PCB is not your phone number. I work with prestige, not profit. If you move to make sure, faster, and make sure to place it very expensive.
I've used
You did not get the PCB address please send me an e-mail with the following information:
Name:
Address:
Phone:
Nick DIY:
PCB name:
Extremely thank