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Old 2nd March 2011, 03:13 PM   #51
EUVL is offline EUVL  Europe
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I just open a new thread to promote discussions and exchange of experiences on the power transformers :

Power Transformer for Class A Amplifiers -- What are your experiences ?




Patrick
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Old 5th March 2011, 09:10 AM   #52
EUVL is offline EUVL  Europe
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Some news :

We got some but not all of the parts for the prototype case.
Will post some photos of loose parts middle of next week.


Patrick
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Old 5th March 2011, 03:16 PM   #53
Horio is offline Horio  United States
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Quote:
Originally Posted by EUVL View Post
Some news :

We got some but not all of the parts for the prototype case.
Will post some photos of loose parts middle of next week.


Patrick
I've been looking forward to this one...
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Old 5th March 2011, 04:03 PM   #54
EUVL is offline EUVL  Europe
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I can only apologise for the delays. A lot of those are not up to me.

We have had bad luck of a computer crash and other unexpected domestic matters that hinders the progress of the PCBs, although we are weeks away only (only the main amp daughter board to do).

There is a economic boom in Asia right now, which means the workshops are short of people, and the order books are full. You can understand that prototyping for a hobby project will not have any priority, and quite rightly so.

But we are discussing with the forum on details now, which is progress. So I still hope to be able to finish the prototype case before Easter, and the PCB testing depends again on how long the vendor will take. The circuit optimisation will take longer.

For those who cannot wait, I can only encourage you to make a working prototyping first using a pair of the standard F5 board you can purchase from the forum (using e.g. cheaper parts like IRFP MOSFETs), and then upgrade later.


Thank you again for your continuous support,
Patrick
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Old 5th March 2011, 04:07 PM   #55
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Regardless of time table, your dedication to the hobby is tremedous, and appreciated.
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Old 5th March 2011, 04:11 PM   #56
qusp is offline qusp  Australia
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no need to apologize, though i understand the compulsion, even when something is beyond your control it is still easy to feel something when people are waiting. there really is no reason to be sorry for doing a nice thing for the forum members, even if slowly, but surely; many of whom are strangers to you. we will be here ready and waiting and when you are ready you will not get the smiles off our faces.

keep up the good work, we really do appreciate it!!!
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Old 5th March 2011, 04:38 PM   #57
qusp is offline qusp  Australia
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haha what a suck , all true but

seriously though

just joking, see above post
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Old 5th March 2011, 05:35 PM   #58
Horio is offline Horio  United States
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No apologies needed Patrick. I think we all understand that everyone inlvolved in the project has a life outside of this project. I'm just excited to see how the prototype case will turn out. Thanks again for all your efforts!
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Old 5th March 2011, 07:25 PM   #59
EUVL is offline EUVL  Europe
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I had some time today and got the control & protection board working.

This is the start up state.

The mains relay to the 500VA transformer will turn on 2 seconds after power on switch. (as represented by the red LED top right).

.
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Last edited by EUVL; 5th March 2011 at 07:38 PM.
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Old 5th March 2011, 07:31 PM   #60
EUVL is offline EUVL  Europe
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One press of the push button (blue) will put it to the standby state, where the regulators would be turned on (as indicated by the red LED bottom left), but the inputs are still shunted, and the outputs are disconnected (if you choose to use a series speaker protection relay).

The red LED on the front panel will also turn on (middle, below the push button).
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