An external PSU is a good solution, HF interference could be an issue though.
If the transformer is actually too close, you could alternatively put a metal sheet between the two.
Is there any sense in making the amp-circuit simpler? Less components = less noise?
Suppose I do not have balanced signals, never adjust bass or treble, and am happy with 2 mono volume-pots so I do not need a balance-pot. What all can be left out?
For treble and bass that is obvious: just leave-out all components that are no longer in the audio path if the tonedefeat switch is activated. (middle circuit)
For the balance this is less obvious: what is the shortest quality-audio path from the input opamp to the volume-pot? Is that as in the 3rd circuit or had I better keep some of those "balance-components" in?
Suppose I do not have balanced signals, never adjust bass or treble, and am happy with 2 mono volume-pots so I do not need a balance-pot. What all can be left out?
For treble and bass that is obvious: just leave-out all components that are no longer in the audio path if the tonedefeat switch is activated. (middle circuit)
For the balance this is less obvious: what is the shortest quality-audio path from the input opamp to the volume-pot? Is that as in the 3rd circuit or had I better keep some of those "balance-components" in?
Attachments
If anybody in India has done a run of these boars Id be interested. In buying them. International shipping is kinda pointless.
Else I plan to get them made by Jlpcb. Ps: You dont need a membership to download the gerber files.
Else I plan to get them made by Jlpcb. Ps: You dont need a membership to download the gerber files.
Hi i am looking for a set of pcbs of the preamp. I Will studio any proposition.
I am located in France.
Georges
I am located in France.
Georges
Apologies.
I have new 110650-5, 110650-6, 110650-4.
I also have a 110650-1, components all mounted, but it has a problem, never got round to checking out the problem.
I have new 110650-5, 110650-6, 110650-4.
I also have a 110650-1, components all mounted, but it has a problem, never got round to checking out the problem.
I really can't remember it's been a few years since I finished that Preamplifier.
If you're interested in the boards I can offer the pcb that has a problem for a reduced price.
If you're interested in the boards I can offer the pcb that has a problem for a reduced price.
The boards I have including the one that has a small problem (probably wrong component/value) are yours for £45 + postage costs
HI All
I am new on this topic and would like you is able to help/support any new builder that goes to build this preamp. As Elektor stopped any support this means I need to have someone that can help. Who is able ? Is that still makes sense to use this "kit" or the one supported by Carl or Doug ?
I just wanted to build a good preamp, it will cost money and I do not want to go in no way because it is old or no support available.
Thanks for your inputs
Georges
I am new on this topic and would like you is able to help/support any new builder that goes to build this preamp. As Elektor stopped any support this means I need to have someone that can help. Who is able ? Is that still makes sense to use this "kit" or the one supported by Carl or Doug ?
I just wanted to build a good preamp, it will cost money and I do not want to go in no way because it is old or no support available.
Thanks for your inputs
Georges
Hi, you will find two threads that have discussed this Preamplifier.
Elektor Preamplifier 2012
Preamplifier 2012 parts
Douglas Self Preamplifier etc
I'm sure the designers Elektor would help you or at least point you in the right direction.
Elektor Preamplifier 2012
Preamplifier 2012 parts
Douglas Self Preamplifier etc
I'm sure the designers Elektor would help you or at least point you in the right direction.
Decided to build this Preamp, I tried to get the PCBs from ELEKTOR, which are currenly (and I guess in future) not available.
Since I'm working a lot with KiCAD, I decided to "reverse engineer" the PCBs.
They might not be perfect, but it's a good beginning with and all my PCBs (seven) are working.
Inside the archive you will find the sources for KiCAD ( at least 9.01) - there might be still bugs, so please check them before ordering.
In the ibom folder you will find the html-BOMs for placing and sourcing the parts.
The BOM for the parts is a bit messy, I will correct that later. But you can generate your own BOM from the iboms.
Unfortunately the files are too big (90 MB in total) to attach them here, so please leave a message, when you are interested and we'll find a way to host them.
Greetings from Freising
Uli
Since I'm working a lot with KiCAD, I decided to "reverse engineer" the PCBs.
They might not be perfect, but it's a good beginning with and all my PCBs (seven) are working.
Inside the archive you will find the sources for KiCAD ( at least 9.01) - there might be still bugs, so please check them before ordering.
In the ibom folder you will find the html-BOMs for placing and sourcing the parts.
The BOM for the parts is a bit messy, I will correct that later. But you can generate your own BOM from the iboms.
Unfortunately the files are too big (90 MB in total) to attach them here, so please leave a message, when you are interested and we'll find a way to host them.
Greetings from Freising
Uli