I will be very appreciative of that. I have a preamp with the Version 2 of the boards so I can test the display and remote boards. Will have to place another parts order with Mouser.
John,
thank you for sharing this really great project,
I am looking for a balanced stereo pre control
can you please confirm that balanced can be done without problems using Version 2 of boards and all I have to purchase 2 pcs for control boards, 1 pcs for display and 1 pcs for remote
thank you for sharing this really great project,
I am looking for a balanced stereo pre control
can you please confirm that balanced can be done without problems using Version 2 of boards and all I have to purchase 2 pcs for control boards, 1 pcs for display and 1 pcs for remote
Hi Samoloko,
The Control board (Main Board) is Balanced from input to output (except two inputs) so only one board is needed. If you look at the schematic two of the inputs, Left J4 and J5, and Right J12 and J13, are single ended only at the input, and with a trace cut at K1.3, K3.3, K16.3, and K17.3 and a couple wires run to the input connector you can restore the full balanced for those two inputs as well.
BTW the Gerbers for the main board are Rev3 which has C7 on the board, the only difference from Rev2 of the main board.
Thanks,
John
The Control board (Main Board) is Balanced from input to output (except two inputs) so only one board is needed. If you look at the schematic two of the inputs, Left J4 and J5, and Right J12 and J13, are single ended only at the input, and with a trace cut at K1.3, K3.3, K16.3, and K17.3 and a couple wires run to the input connector you can restore the full balanced for those two inputs as well.
BTW the Gerbers for the main board are Rev3 which has C7 on the board, the only difference from Rev2 of the main board.
Thanks,
John
John,
thank you for reply
great DIY audio project without bother with computer related stuff
did you think about GB or selling pcbs
thank you for reply
great DIY audio project without bother with computer related stuff
did you think about GB or selling pcbs
Hi Samoloko,
There is not any formal GB for PCBs; however, I have placed an order for 25 sets which I will be selling at cost for $17 each plus shipping from Washington DC. I should receive them in about two weeks and will be sending a set to John for his "blessing". The main board is a copy of the board that went into production and given quality work at PC Prototype should work well. John made minor changes to the Display and Remote PCBs to incorporate a replacement encoder/decoder chip as the originals were out of production. As the changes were minor, they should also work properly.
Once I receive them I will put out a notice that they are available.
Regards,
Roy
There is not any formal GB for PCBs; however, I have placed an order for 25 sets which I will be selling at cost for $17 each plus shipping from Washington DC. I should receive them in about two weeks and will be sending a set to John for his "blessing". The main board is a copy of the board that went into production and given quality work at PC Prototype should work well. John made minor changes to the Display and Remote PCBs to incorporate a replacement encoder/decoder chip as the originals were out of production. As the changes were minor, they should also work properly.
Once I receive them I will put out a notice that they are available.
Regards,
Roy
please save one set for me
please confirm that one set consist of control board, display board and remote board and can do balanced stereo
please confirm that one set consist of control board, display board and remote board and can do balanced stereo
Board Sets
Hi Samoloko,
Consider yourself added to the list. Please send me a PM with your address so I can figure out shipping when the time comes for payment. I'll post my Paypal address when the time comes and will periodically update the list in this thread so everyone will know their status.
Regards,
Roy
Hi Samoloko,
Consider yourself added to the list. Please send me a PM with your address so I can figure out shipping when the time comes for payment. I'll post my Paypal address when the time comes and will periodically update the list in this thread so everyone will know their status.
Regards,
Roy
I still have 3 for the rev 1 boards, built up and tested, these have the overkill power supply on-board. I will sell for $250 each set without a remote case. I am essentially eating a good part of the NRE charge but these are first quality PCBs and parts.
Build Questions
John,
Your picture of the main board shows the relays for input switching mounted on the rear of the PCB. I followed your lead and mounted mine on the back as well. Reading over your first post again I found a reference to problem with the initial board that required the relays on the back that was resolved in previous releases. Given tat the Should I remove the relays and mount them on the front?
I didn't find the volume control resistance in the documentation. I was planning on installing the boards in a XBOSOZ preamp that would like to see 5K liner taper, but has some flexibility. What is the current value and what resister changes would need to be made to get it to 5K?
Thanks,
Roy
John,
Your picture of the main board shows the relays for input switching mounted on the rear of the PCB. I followed your lead and mounted mine on the back as well. Reading over your first post again I found a reference to problem with the initial board that required the relays on the back that was resolved in previous releases. Given tat the Should I remove the relays and mount them on the front?
I didn't find the volume control resistance in the documentation. I was planning on installing the boards in a XBOSOZ preamp that would like to see 5K liner taper, but has some flexibility. What is the current value and what resister changes would need to be made to get it to 5K?
Thanks,
Roy
Yes you will need to mount the relays on the top side of the board or they will not work, the relay will be reverse bias on the bottom and not work.
The BOM shows the volume resistors, they are the RN65 Vishay/Dale resistors. They are the same values as used in the Pass Aleph preamp.
Thanks,
John
The BOM shows the volume resistors, they are the RN65 Vishay/Dale resistors. They are the same values as used in the Pass Aleph preamp.
Thanks,
John
John,
On the main PCB C5 & C6 are listed as .15uF; however the part number you provided is for a .015uf capacitor. Which is correct?
Also, J4-J9, J12-J17 on the main board are the input connectors. Do you have a part number for the 2 & 3 pin connectors or were these to be direct solder?
Thanks,
Roy
On the main PCB C5 & C6 are listed as .15uF; however the part number you provided is for a .015uf capacitor. Which is correct?
Also, J4-J9, J12-J17 on the main board are the input connectors. Do you have a part number for the 2 & 3 pin connectors or were these to be direct solder?
Thanks,
Roy
Hi Roy,
The C5 and C6 are 0.015uf caps. The part number is correct, I will update the typo in the BOM and re-post.
For the inputs to the main board I prefer to direct solder the wires for the best connection.
John
The C5 and C6 are 0.015uf caps. The part number is correct, I will update the typo in the BOM and re-post.
For the inputs to the main board I prefer to direct solder the wires for the best connection.
John
Received the set of Boards yesterday. I will order a set of parts tomorrow and build them up and test the new encoder/decoder chips. Should be fun. 🙂
John,
On the remote board R10 is listed as a 1W resister; however the BOM part listed is 1/2W. Which is correct.
Also, The quantity for R9, R11 on the remote board is listed as 1 while it should be 2.
Regards,
Roy
On the remote board R10 is listed as a 1W resister; however the BOM part listed is 1/2W. Which is correct.
Also, The quantity for R9, R11 on the remote board is listed as 1 while it should be 2.
Regards,
Roy
originally started with a 1 watt but a 1/2 watt is more than enough.
I will updated the BOM again.
When I get time I want to write up a trouble shooting guide, just need some time.
Thanks,
John
I will updated the BOM again.
When I get time I want to write up a trouble shooting guide, just need some time.
Thanks,
John
John,
One final thing. On the remote board there is a position for R5; however, no value for it is listed in the BOM.
One we solve this and I find another small 150R resister to fit in R11 on the display board, my boards should be stuffed.
One final thing. On the remote board there is a position for R5; however, no value for it is listed in the BOM.
One we solve this and I find another small 150R resister to fit in R11 on the display board, my boards should be stuffed.
Ah yes, the R11 is new to this new rev of the board, a new feature of the board is the valid transmission receiving LED. R11 is a current limiter on the LED need to bump the quantity. Thanks for the catch.