A couple of months ago I purchased boards and components from veteran (and wm8816s form Wolfson) and I have finally found the time to complete the assembly and test of a prototype.
I have started with the driver module. I only want the volume control and there are very few components to solder on the driver pcb as you can see on the picture (there are not many more for the relay selector, the board has been designed for possible extensions):
I have started with the driver module. I only want the volume control and there are very few components to solder on the driver pcb as you can see on the picture (there are not many more for the relay selector, the board has been designed for possible extensions):
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What was the cost ?
Did you buy everything from Veteran? What was the cost?
Many of us have given up on veteran, waited over a year for the
project. What is the status of this project?
Did you buy everything from Veteran? What was the cost?
Many of us have given up on veteran, waited over a year for the
project. What is the status of this project?
And now the whole thing. To be honest it did not work at first and it took me some time to find a bad solder on a smd resistor. Once corrected it worked fine.
I do not know about the sound. For the time being I am happy just looking at the trace on the 'scope.
Many thanks to Damian. I am very happy with the result. I now have to find the time to build the rest of the project (an 8 way attenuator)!
Cheers
Christian
I do not know about the sound. For the time being I am happy just looking at the trace on the 'scope.
Many thanks to Damian. I am very happy with the result. I now have to find the time to build the rest of the project (an 8 way attenuator)!
Cheers
Christian
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veteran has published the costs somewhere on this thread. You should contact him on the email address on his unisonus.com site to have confirmation.
veteran sent me the PCBs, the pre-programmed Atmel controller (no, I do not think he will make the code public), the optocouplers, the smd resistors, the sockets, cable, everything except the wm8816s (he said a few days ago he can supply these too now), the opamps (your choice) and the traditional resistors and electrolytics.
veteran sent me the PCBs, the pre-programmed Atmel controller (no, I do not think he will make the code public), the optocouplers, the smd resistors, the sockets, cable, everything except the wm8816s (he said a few days ago he can supply these too now), the opamps (your choice) and the traditional resistors and electrolytics.
Re: VETERAN What is the cost
I just had a look at Mouser, they sell Wolfson now but not the WM8816.
I suggest you contact him directly, as he requested.ppcblaster said:
I just had a look at Mouser, they sell Wolfson now but not the WM8816.
You can drive several wm8816s from the same driver and cable. I am actually building an 8 channel volume control with 4 wmstamp boards all driven by the same controller.
However all wm8816s will always be at the same attenuation level.
If you want a fixed offset between some channels, it has to be done elsewhere.
There would actually be a possibility to separately address several wm8816s but it would require a modification in the controller programming. The board would also allow only 3 wm8816s to be driven, using the J1, 2,3 jumpers (in the present implementation, all jumpers on your wmstamps boards should be in the J1 position).
Christian
However all wm8816s will always be at the same attenuation level.
If you want a fixed offset between some channels, it has to be done elsewhere.
There would actually be a possibility to separately address several wm8816s but it would require a modification in the controller programming. The board would also allow only 3 wm8816s to be driven, using the J1, 2,3 jumpers (in the present implementation, all jumpers on your wmstamps boards should be in the J1 position).
Christian
Hi Veteran,
I tried to email you but I am still under moderation.
Do you still have these boards available?
driver: PCB + programmed microcontroller + components (50$)
WMSTAMP PCB tin plated: 6$
components for WMSTAMP PCB (optocouplers, 5V voltage regulator, resistors, connector): 12$
Thanks,
Simon Teng
bipolar@ms12.hinet.net
I tried to email you but I am still under moderation.
Do you still have these boards available?
driver: PCB + programmed microcontroller + components (50$)
WMSTAMP PCB tin plated: 6$
components for WMSTAMP PCB (optocouplers, 5V voltage regulator, resistors, connector): 12$
Thanks,
Simon Teng
bipolar@ms12.hinet.net
Tengsimon, I replayed your email.
For those who will assemble my deriver boards - there is no need to mount all the components.
1) There is no need for relay circuit - just solder two 0R resistors:
2) Only JP3 is needed in the area of CON2 connector:
For those who will assemble my deriver boards - there is no need to mount all the components.
1) There is no need for relay circuit - just solder two 0R resistors:
An externally hosted image should be here but it was not working when we last tested it.
2) Only JP3 is needed in the area of CON2 connector:
An externally hosted image should be here but it was not working when we last tested it.
You have to use logarithm to calculate that:
gain [dB] = 20 log (Vout/Vin)
If you set -6dB gain you will receive a half of the input signal on output.
gain [dB] = 20 log (Vout/Vin)
If you set -6dB gain you will receive a half of the input signal on output.
Please excuse me if this is not possible as I am a newbie just learning electronics,
Could I remove the OPTs at the end and use this as just an audio attenuator for a tube preamp? I don't need any amplification just attenuation.
Thanks,
Ron
Could I remove the OPTs at the end and use this as just an audio attenuator for a tube preamp? I don't need any amplification just attenuation.
Thanks,
Ron
This won't be possible - wm8816 works in op-amp feedback and it will be hard to implement it for tube design.
Thank you for your kind response.....I'll keep looking for an controller as nice as yours. Very well done indeed!
Ron
Ron