The purpose of this thread is aimed for people who (or recently completed) are currently undergoing construction of the Elektor Preamplifier 2012 that was published in April, May and June 2012.
See these links.
https://www.elektormagazine.com/labs/preamplifier-2012-1-introduction-and-line-intonevolume-board-110650
http://https://www.elektormagazine.com/magazine/elektor-201204/19844
Your constructions, ideas, problems, images etc would be valuable for other constructors to view.
Although, most readers will be familiar with the Elektor project, below i have list some basic details below.
Printed Circuits Boards for this project are available direct from Elektor: -
LLLL BOARD (110650-6V120) £14.95
POWER SUPPLY BOARD (110650-5V110) £16.95
FRONT PANEL BOARD (110650-4V110) £11.95
INPUT BOARD (110650-3) £22.95
Preamplifier 2012 (2) (110650-2) £22.95
LINE-IN/TONE/VOLUME BOARD (110650-1) £22.95
See these links.
https://www.elektormagazine.com/labs/preamplifier-2012-1-introduction-and-line-intonevolume-board-110650
http://https://www.elektormagazine.com/magazine/elektor-201204/19844
Your constructions, ideas, problems, images etc would be valuable for other constructors to view.
Although, most readers will be familiar with the Elektor project, below i have list some basic details below.
Printed Circuits Boards for this project are available direct from Elektor: -
LLLL BOARD (110650-6V120) £14.95
POWER SUPPLY BOARD (110650-5V110) £16.95
FRONT PANEL BOARD (110650-4V110) £11.95
INPUT BOARD (110650-3) £22.95
Preamplifier 2012 (2) (110650-2) £22.95
LINE-IN/TONE/VOLUME BOARD (110650-1) £22.95
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Getting ready to put together.
Just stuck on how to be able to drill the holes for the Input PCB (x2) and also for the Front Panel PCB.
Note that on the BOM list supplied by Elektor it indicates C12 with Farnell number 1236680.
This code number it is actually a Non-Polarised capacitor 10uF 63V.
On page 26 of Preamplifier 2012 (3) C12 is actually a 10uF 63V, and should not be Non-Polarised.
Just stuck on how to be able to drill the holes for the Input PCB (x2) and also for the Front Panel PCB.
Note that on the BOM list supplied by Elektor it indicates C12 with Farnell number 1236680.
This code number it is actually a Non-Polarised capacitor 10uF 63V.
On page 26 of Preamplifier 2012 (3) C12 is actually a 10uF 63V, and should not be Non-Polarised.
Attachments
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Ok think I got it now: I would have to buy an elektor membership in order to download the gerber files which I then can have manufactured somewhere.
I think that's too much of an investment upfront for a single project. Unfortunately I'm not too talented with vero boards... on the other hand it would probably keep me busy for a good while
I think that's too much of an investment upfront for a single project. Unfortunately I'm not too talented with vero boards... on the other hand it would probably keep me busy for a good while
That is very kind of you thanks a lot. I got the gerber files meanwhile though and was surprised how affordable chinese manufactures are. It's probably cheaper to have them made then to post them across the atlantic.
We "late builders" should stay in touch though. I just started to look out for parts and some of them appear to be outdated already. E.g. the many styloflex caps or the 5532ANGs...
We "late builders" should stay in touch though. I just started to look out for parts and some of them appear to be outdated already. E.g. the many styloflex caps or the 5532ANGs...
You'll still have to post them from China. I was charged $28.56 for shipping from China to Colorado.You also might not be able to order just 1 board, as many PCB shops have a MOQ.
The transistors for the phono pre are no longer made. The 15pF polystyrene caps, FSC 160V 15PF+/-1PF, were just discontinued by LCR Components. I think I got the last few before someone bought out remaining inventory. Also, the 4700pF polystyrene is on back order until June from Newark. I had to find a different source to complete my build and I just got them in on Monday from U.K. I also found I had to order different .1uF decoupling caps, as the ones I initially ordered were too large for the footprint.
I still have to wire the interconnects, mount the ICs and transistors, and solder the polystyrenes that just came in.
The transistors for the phono pre are no longer made. The 15pF polystyrene caps, FSC 160V 15PF+/-1PF, were just discontinued by LCR Components. I think I got the last few before someone bought out remaining inventory. Also, the 4700pF polystyrene is on back order until June from Newark. I had to find a different source to complete my build and I just got them in on Monday from U.K. I also found I had to order different .1uF decoupling caps, as the ones I initially ordered were too large for the footprint.
I still have to wire the interconnects, mount the ICs and transistors, and solder the polystyrenes that just came in.
Attachments
That looks very impressive already. I hope I will be able to keep up with this .
I'm planning to replace the polystyrene caps with matching Wima FKP types where possible. This seems to be the 2021-equivalent. They have a 2.5% tolerance compared to the 1% tolerance as per the BOM. But the low prices allow for greater quantities which I will meassure and match by hand.
The 1k pots seem to be another hard-to-source case. I could obtain different ones which are only rated for 0.4W though. The pots in the BOM are of 1W rating and the listed alternative was 0.5W. Do you think that the power rating of the pots is really that critical? I can hardly imagine that the pots would have to dissipate serious power?
.I'm planning to replace the polystyrene caps with matching Wima FKP types where possible. This seems to be the 2021-equivalent. They have a 2.5% tolerance compared to the 1% tolerance as per the BOM. But the low prices allow for greater quantities which I will meassure and match by hand.
The 1k pots seem to be another hard-to-source case. I could obtain different ones which are only rated for 0.4W though. The pots in the BOM are of 1W rating and the listed alternative was 0.5W. Do you think that the power rating of the pots is really that critical? I can hardly imagine that the pots would have to dissipate serious power?
I also have a set of these boards that I bought from Elektor directly quite a while ago. Some parts are still missing, but I really want to get it done in the near future. I did manage to get most of the proper polystyrene capacitors over Farnell (or Develektro for private customers in Germany - quite pricy tbh).
Thanks a lot. ahtllc was so kind to share a set of Pcbs with me.
I've already ordered all of the parts and hope that I haven't missed too much. It seems like sourcing the right parts for a dated project like this is quite challenging.
I avoided the styroflex caps alltogether and opted for wima caps with the same lead spacing. I was pleasantly surprised that the Pcbs have holes for different spacings for some of the caps. That is great design.
I've already ordered all of the parts and hope that I haven't missed too much. It seems like sourcing the right parts for a dated project like this is quite challenging.
I avoided the styroflex caps alltogether and opted for wima caps with the same lead spacing. I was pleasantly surprised that the Pcbs have holes for different spacings for some of the caps. That is great design.
I still have a couple of sets left, except the input board, which requires two boards. I only have one of those left.
I'm waiting for one polystyrene cap from Newark. FSCEX 220PF 1% 630V from LCR Components
It's not going to be in stock until June, so my project is on hold until then. Everything else except the case and cabling is done.
I'm waiting for one polystyrene cap from Newark. FSCEX 220PF 1% 630V from LCR Components
It's not going to be in stock until June, so my project is on hold until then. Everything else except the case and cabling is done.
Templates & Case
I used the case from R.S. Components for my build going back a few years (see attachment).
Based on this case, i have attached a couple of templates for those that might need it.
In Part 3 of the Elektor article, on page 23, you will see the image of the Preamplifier’s input board (here at 75% of its real size).
Two of these are required for stereo operation.
Elektor were requested to re print this Pre Amplifier with all their errors corrected............
I used the case from R.S. Components for my build going back a few years (see attachment).
Based on this case, i have attached a couple of templates for those that might need it.
In Part 3 of the Elektor article, on page 23, you will see the image of the Preamplifier’s input board (here at 75% of its real size).
Two of these are required for stereo operation.
Elektor were requested to re print this Pre Amplifier with all their errors corrected............
Attachments
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