I can't tell from the photo if the pin spacing is correct or not but maybe you could solder 2 x 2way screw terminal blocks where the secondary windings connect and use a small chassis mount torroid instead?
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Pin spacing is correct - I measured the board and compared to the datasheet for the alternate transformer. I thought about an offboard transformer, but that kinda feels like a kludge. Still confused why all the EI38 transformers disappeared!
BK
You can maybe buy the trafo here..
https://www.reichelt.de/Printtrafos...ndex.html?ACTION=3&GROUPID=4533&ARTICLE=27352
They accept paypal and the unit weigh 150grams, so shipping should not be to much.
https://www.reichelt.de/Printtrafos...ndex.html?ACTION=3&GROUPID=4533&ARTICLE=27352
They accept paypal and the unit weigh 150grams, so shipping should not be to much.
You can also trye here..
https://www.buerklin.com/en/pcb-transformer/p/39c106
It`s going to cost you about €28-30 incl shipping though..
https://www.buerklin.com/en/pcb-transformer/p/39c106
It`s going to cost you about €28-30 incl shipping though..
Sorry i googeled and ended up at the block web page, in the avb series, and not the vc series that the pcb is designed for..The avb series can be wired for 115v/230v, and i thought they all could. Sorry for getting your hopes up.
The closed i have found with 115v is this one.. but you have to modify the pcb or maybe put it above the pcb on some kind of adapter..
AVB 3,2/2/12 - BLOCK - Isolation Transformer, Safety, 3.2 VA, 2 x 115V, 2 x 12V, 133 mA, AVB Series | Newark element14
AVB 3,2/2/12 - BLOCK - Isolation Transformer, Safety, 3.2 VA, 2 x 115V, 2 x 12V, 133 mA, AVB Series | Newark element14
Good find thank you for the searching! PN AVB 3,2/2/12, link doesn't work for me. Footprint and pin spacing check out. Same issue as the CL2-5.0R-12 though in that it's setup for dual primaries. The price is great and 38 in stock, but I have some other things to get from Mouser so I might grab the CL2-5.0R-12 instead.
BK
@BK: the PCB that you have accommodates EI38 - transformers only. My current PCB-release supports both EI38 and TAMURA.
As I have written you: I am on holiday right now and do not have access to all of my current EAGLE layouts.
I will show them, as soon as I am back home again (next thursday).
So please have some patience.
Best regards - Rudi_Ratlos
As I have written you: I am on holiday right now and do not have access to all of my current EAGLE layouts.
I will show them, as soon as I am back home again (next thursday).
So please have some patience.
Best regards - Rudi_Ratlos
Rudi,
I assumed that I received the same SPO PCB as everyone else who was part of the GB that is the subject of this thread!
As I explained in post #146, I ordered the Tamura 3FD-324 on the BOM and discovered that it was not at all compatible.
If my SPO board is not the current release that the others received, may I get one that will work with the Tamura that I already purchased?
BK
@bk856er
Can you please post a picture of your PCB? I just want to see if we have the same revision.
Thanks
Do
Can you please post a picture of your PCB? I just want to see if we have the same revision.
Thanks
Do
We definitely have a different rev. Mine does have multiple footprint for the transformer. If the Tamura I had specified didn't match it is most likely because of this.
Thanks
Do
Add to newest GB
Hi Rudi,
Please add me to the list for a stereo amplifier:
FC-100 PCB x 2
LT3062 PSU x 2
Soft Power on PCB.
enjoy your holidays.
Thanks,
Myles
Hi Rudi,
Please add me to the list for a stereo amplifier:
FC-100 PCB x 2
LT3062 PSU x 2
Soft Power on PCB.
enjoy your holidays.
Thanks,
Myles
When you hold the board with the transformer in the upper left corner, one board has 2 pads on primary side, and four on sec side, while the other has 8 pads on each side. I have one of each board. The pads for the fuse is at 90deg on one and 45 deg on the other, mur840 and 1n5408 is different..i think that is most of the difference.
OK, so you and pinnocchio are confirming that there are two different revisions of the SPO PCB within the GB here. Or perhaps I was the only one to get a special PCB. In this post I mentioned that my board didn't match post #1 or Rudi's documentation. I don't know which version is new/old or how to refer to them since there is no revision number silkscreened. If the new transformer fits and the board modification works I should be OK. Need to also get some 1N5408 instead of MUR840.
BK
There are 3 different i think... the single trafo "El-38 pcb", multi trafo with fuse pads at 45deg, and the latest with multitrafo and fuse pads at 90deg like in the pic in post #1. I have no 1 & 2. I saw they where different when i got them, but they where so close i didn`t see it as a problem..
I am back home again and like to summarise the current FC-100 order - see image 1.
The order includes:
1) the FC-100 amplifier PCB (image 2). Its size is 247 x 84mm.
If you do not like the MUR rectifiers being on the PCB, use an external full-bridge rectifier and solder a solid wire as shown on the image (yellow track).
2) the Frontend-PSU.
When I offered you my dual LT3062-PSU as the FC-100 frontend-PSU, I did not mention, how tiny the LT3062 regulator is (image 3).
I doubt that all of you will be able to solder such a tiny device.
I will therefore offer you 2 of the original FC-100 frontend shunt-regulators, which have been designed by Mihai. See image 5.
3) the SoftPowerOn & TemperatureControl - PCB (see image 4).
The SPO-PCB will delimit the inrush-current to a value determined by the "inrush-resistors" for about 0.5 seconds. Then mains will then flow unhindered.
Moreover it is able to monitor the temperature of a heatsink and will turn a DUO-LED red, if a threshhold-temperature (50°C) is exceeded.
Mihai Rauta'S FC-100 is an extraordinarily good-sounding (!!) amplifier.
My own version (image 5) is using two torodial transformers 2x25VAC / 225VA. It uses Mihais shunts and the SPO (on top of the two transformers).
Please take care to use well matched transistors!
It would be best if one of you orders the needed transistors (NJW, 2SA, 2SC. 2SK170, ...) for all of you and measures and matches them. I may be able and tell him, where to buy the transistors.
If you have any questions: post it in this thread.
Best regards - Rudi_Ratlos
P.S.: Image 5 is showing Mihais Frontend-Shunt. Its size is 75 x 75mm.
The order includes:
1) the FC-100 amplifier PCB (image 2). Its size is 247 x 84mm.
If you do not like the MUR rectifiers being on the PCB, use an external full-bridge rectifier and solder a solid wire as shown on the image (yellow track).
2) the Frontend-PSU.
When I offered you my dual LT3062-PSU as the FC-100 frontend-PSU, I did not mention, how tiny the LT3062 regulator is (image 3).
I doubt that all of you will be able to solder such a tiny device.
I will therefore offer you 2 of the original FC-100 frontend shunt-regulators, which have been designed by Mihai. See image 5.
3) the SoftPowerOn & TemperatureControl - PCB (see image 4).
The SPO-PCB will delimit the inrush-current to a value determined by the "inrush-resistors" for about 0.5 seconds. Then mains will then flow unhindered.
Moreover it is able to monitor the temperature of a heatsink and will turn a DUO-LED red, if a threshhold-temperature (50°C) is exceeded.
Mihai Rauta'S FC-100 is an extraordinarily good-sounding (!!) amplifier.
My own version (image 5) is using two torodial transformers 2x25VAC / 225VA. It uses Mihais shunts and the SPO (on top of the two transformers).
Please take care to use well matched transistors!
It would be best if one of you orders the needed transistors (NJW, 2SA, 2SC. 2SK170, ...) for all of you and measures and matches them. I may be able and tell him, where to buy the transistors.
If you have any questions: post it in this thread.
Best regards - Rudi_Ratlos
P.S.: Image 5 is showing Mihais Frontend-Shunt. Its size is 75 x 75mm.
