Batery powered DIY CNC phono stage

Wharfedale Super Denton 3-way Bookshelf Speaker
Congrats John for the CNC build :clapping: :clapping:

very nice soldering.. looks very neat work

I am also planning to build one for myself, I already did the MC phono and BI pre amp

+1 for sachin's suggestion on keeping the cables short,

I recommend go for the B1 pre amp of sachin and you will get to notice difference

you can use the power supply of B1 to power both pre and phono and put everything in one cabinet , like FM member raghunad did

I really appreciate the patience of sachin, he tirelessly answers all the questions.

Thanks to both Om Mishra sir and sachin for your efforts to bring this gears to us
 
Hey Tanoj,

Thanks for the complements :). I already got the power supply kit from Sachin and I am not building Pass B1, but just taking the source selector from Pass B1 build. I am planning to get a tube Pre for my setup. I will pick up on of the following Pre

1. Lyrita DHT Pre
2. Dared SL2000A Pre

Since I am attracted to the seductive and lush sound of a tube Pre, I dont want to add a SS Pre to my setup. My power amp is SS. I got a used Acoustic Portrait NJ1 dual mono power amp from a FM.

Thanks,
John.
 
sachu888 said:
Hi John,
Soldering looks good,one suggestion please keep the input output wires length as short as required.Sound will improve after 25-30 hrs.
You can increase its gain by swapping 150 Ohm resisters with 100 Ohm without any ill effect.
Which resistive loading did you select on DIP switches?

Regards,
Sachin
Click to expand...

Hey Sachin,

I am not that worried about the gain now as its only marginally less. Anyway thanks for the suggestion to change the resistance value for better gain. I will see if I need to increase the gain when I use a tube Pre.

My cart body is OM5e and stylus is OM30. I have kept the DIP switch to 47K. I hope that is fine.

Thanks,
John.
 
I would really like to thank Sachin and Omishra for creating this wonderful PCB and the Kit. The PCB is of excellent quality and instructions and help provided by both of them is simply amazing.

I am so excited about my first build and now want to do more of DIY. I would like to really appreciate Sachin and Om in helping me start on the DIY route. It feels so good to hold the soldering iron again after 15 years :yahoo:

My next build will be the power supply for CNC and the relay based source selector taken from Pass B1 build.

You guys ROCK :clapping:

Thanks,
John.
 
john_k_antony said:
Hey Sachin,

I am not that worried about the gain now as its only marginally less. Anyway thanks for the suggestion to change the resistance value for better gain. I will see if I need to increase the gain when I use a tube Pre.

My cart body is OM5e and stylus is OM30. I have kept the DIP switch to 47K. I hope that is fine.

Thanks,
John.
Click to expand...

Hi John,
47k is sufficient for most of the carts,try 62k too.I will send you few more Opamps for testing purpose once you finish power supply.

Regards,
Sachin
 
john_k_antony said:
Sachin/Om,

Do you recommend using Berg strips and then using a 1-1 female connector wire to connect wires to the PCB ? The wires from RCA connectors and power supply. Right now I do a dirty workaround of soldering the leads from resistor and soldering the wires to the leads :).

This is what I am looking for.

Berg strip 1X40 Male 2MM - Nex Robotics

1 to 1 Black Connector - Nex Robotics

1 to 1 Red Connector - Nex Robotics

Thanks,
John.
Click to expand...
Hi John,
Breg strip is a good idea for RCA connectors.I will use it when I shift CNC into Raghunath's cab.Please see wizardofoz build here http://www.lencoheaven.net/forum/index.php?topic=9021.15 no need to use female connectors just solder directly on strip.
EDIT: For Transformer and ower connection,you can use press fit kind of connectors same as Raghunath used here http://www.audiokarma.org/forums/showthread.php?p=6063848

Regards,
Sachin
 
Last edited:
Sachin,

A strange thing happened today evening. Suddenly there was no sound from the CNC. I played 2 LPs fine yesterday night. But today evening when I turned it on, there is no sound from CNC.

I did a quick debug and found that one of the batteries drained off. The output from the battery is only 2V. Other battery was fine at 9V. I replaced both batteries and CNC is back to life :clapping:

However I have a question. Did that battery drain off with just 2 LPs playing because of any issue with the CNC build or it was just a bad battery?

I am running the CNC with new pair of batteries now. Playing just fine now.

I hope it was the bad battery and nothing is wrong with CNC assembly :sad:

Thanks,
John.
 
john_k_antony said:
Sachin,

A strange thing happened today evening. Suddenly there was no sound from the CNC. I played 2 LPs fine yesterday night. But today evening when I turned it on, there is no sound from CNC.

I did a quick debug and found that one of the batteries drained off. The output from the battery is only 2V. Other battery was fine at 9V. I replaced both batteries and CNC is back to life :clapping:

However I have a question. Did that battery drain off with just 2 LPs playing because of any issue with the CNC build or it was just a bad battery?

I am running the CNC with new pair of batteries now. Playing just fine now.

I hope it was the bad battery and nothing is wrong with CNC assembly :sad:

Thanks,
John.
Click to expand...
Did you turn off toggle switch?could be bad batteries.

Regards,
Sachin
 
Hi Sachin.

I turned off the power switch before I went to sleep yesterday nite. Its only one battery that got drained off. Other one was showing full 9V. However, I changed both and now playing for last 3 hrs. Its playing just fine :). Will update you later if same issue crops up tomorrow.

Now I am playing with different loading resistance. Started with 18K. Will share my listening impression after I try out all the loading resistance option.

Thanks,
John.
 
john_k_antony said:
Sachin,

A strange thing happened today evening. Suddenly there was no sound from the CNC. I played 2 LPs fine yesterday night. But today evening when I turned it on, there is no sound from CNC.

I did a quick debug and found that one of the batteries drained off. The output from the battery is only 2V. Other battery was fine at 9V. I replaced both batteries and CNC is back to life :clapping:

However I have a question. Did that battery drain off with just 2 LPs playing because of any issue with the CNC build or it was just a bad battery?

I am running the CNC with new pair of batteries now. Playing just fine now.

I hope it was the bad battery and nothing is wrong with CNC assembly :sad:

Thanks,
John.
Click to expand...
It will happen again. Please correct your wiring.
Just saw your wiring again. I think you connected single pole switch only to red wire. Black wire is directly going to CNC PCB. That means you are not disconnecting negative wire. That should be connected with DPDT switch, disconnecting both negative and positive of CNC phono board. Ground can remain connected.
 
Hey Om,

You are right. I thought I just need to break the positive connection from the battery trough the switch. The negative is always connected to the PCB.

So you recommend me to get a DPDT switch instead of the 3 lead switch I am using right now that just cuts the positive terminal from the battery?

So tonight, I will remove the batteries from the socket as I am not disconnecting the negative.

Thanks,
John.
 
john_k_antony said:
Hey Om,

You are right. I thought I just need to break the positive connection from the battery trough the switch. The negative is always connected to the PCB.

So you recommend me to get a DPDT switch instead of the 3 lead switch I am using right now that just cuts the positive terminal from the battery?

So tonight, I will remove the batteries from the socket as I am not disconnecting the negative.

Thanks,
John.
Click to expand...
Yes remove batteries till you fix this. Power off should disconnect both -ve and +ve together. You can use DPST or DPDT for the purpose.
 
Special Offer: Wharfedale EVO 4.2 Speakers
Get the Wharfedale EVO 4.2 3-Way Standmount Speakers at a Special Offer Price.

Similar threads

reubensm
Phonostage Upgrade Thread
Replies
12
Views
2K
reubensm
reubensm
jls001
HT MC Phono Stage AD797
7 8 9
Replies
166
Views
50K
Sushant Sharma
Sushant Sharma
shaizada
REVIEW: RSA F117 Nighthawk Phono Stage
Replies
19
Views
8K
anm
A
V
Stereophile's Recommended List for 2010.
Replies
6
Views
65K
raj
R
Back
Top