And finally ...
This is a PIC of the MUTE DELAY ON circuit. It is identical to the one on the previous IO board. The capacitor determines the delay ON time. A 47uF cap will give a 3 second delay and is usually sufficient. However the time delay ON can be extended to 5 seconds (approximately) by using a 100uF capacitor.
That's it for now! I will post a BOM and schematic soon.
This is a PIC of the MUTE DELAY ON circuit. It is identical to the one on the previous IO board. The capacitor determines the delay ON time. A 47uF cap will give a 3 second delay and is usually sufficient. However the time delay ON can be extended to 5 seconds (approximately) by using a 100uF capacitor.
That's it for now! I will post a BOM and schematic soon.
NOTE IN THE ABOVE PIC ...
The terminal block marked '12v SW' must be shorted for the IO to turn on. The terminal block is there for those builders that want to add a standby switch. If you have no interest in that feature a builder could simply solder a leftover resistor lead in the PCB holes provided for the terminal block.
The terminal block marked '12v SW' must be shorted for the IO to turn on. The terminal block is there for those builders that want to add a standby switch. If you have no interest in that feature a builder could simply solder a leftover resistor lead in the PCB holes provided for the terminal block.
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Enhanced IO BOM
The BOM in Excel Spreadsheet form is here: https://dl.dropboxusercontent.com/u/33294265/ENHANCED_IO_BOM_01.xls
The BOM in Excel Spreadsheet form is here: https://dl.dropboxusercontent.com/u/33294265/ENHANCED_IO_BOM_01.xls
Enhanced IO BOM
Aah yes...
Don't forget the 9 pieces of 1N4148 diodes that solder across the relay coils on the back side of the PCB.
Thank you Orreborre for point out my omission from the BOM
Aah yes...
Don't forget the 9 pieces of 1N4148 diodes that solder across the relay coils on the back side of the PCB.
Thank you Orreborre for point out my omission from the BOM
Hi Carl,
Since you did the layout, can you provide a drill layout for the new rear panel as well?
Since you did the layout, can you provide a drill layout for the new rear panel as well?
H Carl,
Got my enhances I/O today, looks great. I noticed on the BOM R1,R3 and R2-R28 shown, but they aren't on the board. Are they a typo ? what are they for ?
Thanks,
Paul
Got my enhances I/O today, looks great. I noticed on the BOM R1,R3 and R2-R28 shown, but they aren't on the board. Are they a typo ? what are they for ?
Thanks,
Paul
Ah, the dropbox download link contains two more part numbers that is not in BOM picture above
Ye, that's where I saw it. No worries, mouser order on the way. I also ordered a 2U case from DiyAudio to make my life easy. Building cases can be time consuming and run into some money. Hard to argue with the pricing and free shipping here.
PJN
PJN
I just looked at the download file and didn't see extra parts. Perhaps you got hold of the file during an early edit.
Guys,
I have offered Carl to host the data package for this project on my website:
Projects | Linear Audio.
Just download the .zip and you have all the information necessary to make this a successful project.
Whenever there is an update, I will update the package accordingly.
Hopefully this will help to have a central place for all up-to-date information.
Jan
I have offered Carl to host the data package for this project on my website:
Projects | Linear Audio.
Just download the .zip and you have all the information necessary to make this a successful project.
Whenever there is an update, I will update the package accordingly.
Hopefully this will help to have a central place for all up-to-date information.
Jan
Thanks
Thanks for that... very useful when newbies are joining this thread.. and the rest of us who occasionally lose the plot
George
Hi Jan,
Thanks for that... very useful when newbies are joining this thread.. and the rest of us who occasionally lose the plot
George
Well I think Carl is doing an absolutely sterling job in running this project. This may save a bit of his precious time.
Jan
Jan
I am excited about this preamp build. I have ordered all of the parts, including the kit cost from Carl, the total is about 300usd. Still need a case, knobs, related hardware. Since there is a lot of holes need for the pots and other connectors, if anyone has thoughts, template or other ideas that would be great. I am thinking about using Frontpanel Express, though figuring out dimensions for drilling is not my strong suit.