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Roender'S FC-100 - Group Buy

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#181
Brought the amplifier to our local DIY day yesterday and it really sounded good. This amplifier has really good control on the bass. It is really well balanced. I only had 30 minutes of listening so far and I don't have the chassis anymore since it was a temp chassis that my friend lent me for the prototype. The chassis got sold later that day and the amplifier has no more home...

But it is definitely worth putting into a nice chassis, something I will do in the coming weeks.

Thanks
Do
 
#187
I am collecting your requests:

FC-100 amplifier PCB:
Mituisho : 2pcs.
Philipp23: 2pcs.
stryx: 2pcs.

Frontend PSU-PCB:
Philipp23
stryx

I am on a short holiday (1 week) right now.

If you agree I would like and do a small change on the FC-100 layout: remove the backend-PSU rectifiers off the PCB and replace them by a full-bridge rectifier
which has to be mounted on the amplifier's heatsink

Concerning the frontend-PSU: I am able to offer you the original shunt Regulator designed by Mihai or a LT3062 - based dual +/- PSU with layout by myself.

http://www.diyaudio.com/forums/power-supplies/293758-lt3062-based-psu-3.html

I will once more measure / verify the LT3062 - PSU, when I am back home.

Best regards - Rudi
 
#188
Hi Rudi, is it possible to make the original soft start available? These are great and I would be interested in a couple of boards. My only concern is if the transformer is available as a standard size, ie from mouser. Thanks.
 
#192
Luke said:
Hi Rudi, is it possible to make the original soft start available? These are great and I would be interested in a couple of boards. My only concern is if the transformer is available as a standard size, ie from mouser. Thanks.
Click to expand...

+1. The little transformer is the last component I need to locate. 12V EI38 block style seems to be obsolete on my continent. Recent board has no provision for Tamura type. Appreciate any leads for a compatible part!

BK
 
#193
bk856er said:
+1. The little transformer is the last component I need to locate. 12V EI38 block style seems to be obsolete on my continent. Recent board has no provision for Tamura type. Appreciate any leads for a compatible part!

BK
Click to expand...

I think maybe I found a suitable 12V transformer. The CL2-5.0R-12 part fits the PCB footprint, as does the pin spacing. HOWEVER, it has dual primaries and the SPO is setup for single primary. Can someone confirm after looking at this datasheet if simply linking pins 3+4 would allow this transformer to work for here? I think I can do that above the PCB with some wire.

BK
 
#194
bk856er said:
I think maybe I found a suitable 12V transformer. The CL2-5.0R-12 part fits the PCB footprint, as does the pin spacing. HOWEVER, it has dual primaries and the SPO is setup for single primary. Can someone confirm after looking at this datasheet if simply linking pins 3+4 would allow this transformer to work for here? I think I can do that above the PCB with some wire.

BK
Click to expand...

Yes, it would give you a 230V primary. Could be done with a couple of 2mm holes on the pcb and a wire link. Nice work!
 
#195
Luke said:
Yes, it would give you a 230V primary. Could be done with a couple of 2mm holes on the pcb and a wire link. Nice work!
Click to expand...

My ignorance is going to show now...how to use to 115V?

*edit* Looking at the bottom of the PCB I see that with a couple new holes and some creative wiring it can be made to work parallel or series.

BK
 
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#197
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#200
Here's the SPO board with the 12VAC transformer section outlined on both sides. I think the CL2-5.0R-12 mentioned above can be made to work with some new holes and wiring. I initially got the specified Tamura and it's a no-go!

BK
 

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