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Old 26th August 2012, 08:08 PM   #211
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of course, music is playing :P

I started winding today, it took me 5 hours to finish it and connect it to the mains, this is my first time building a transformer : )
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Old 26th August 2012, 08:11 PM   #212
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That's quite an accomplishment. What values/rating did you come up with?
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Old 26th August 2012, 08:13 PM   #213
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24.6-0-24.6, transformer rated at 180W.
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Old 26th August 2012, 08:14 PM   #214
bcmbob is offline bcmbob  United States
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Impressive ! Maybe you found a new side job "Metal's Custom Transformers"
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Old 26th August 2012, 08:18 PM   #215
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It made me too busy today, I did not go to work ; )

It was not easy thu, I had to wind 652 for the primary! My head is glowing @ the moment : )
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Old 26th August 2012, 08:29 PM   #216
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Relays and LEDs on first power up.

DC offset < 2 mV both sides.

14.55, -14.5 @ C102,C202

Early impression, very detailed, dynamic, very clear.

Click the image to open in full size.

Before you guys try to politely explain the correct direction for a heatsink, let me explain that my final application of these boards will be mounted vertically on the back of each speaker. In this photo, the test board is tilted about 45 degrees and they seem to run cool enough.

One other caveat. My system runs a feedback subwoofer with an active cutoff at about 100 Hz. I won't have any comments on bass because the sub handles that. In fact, because the FE's have a higher gain than the sub was originally designed for, I actually lost a touch of bass level. I'll clean that up in the next (balanced) version of the subwoofer board.

Last edited by lehmanhill; 26th August 2012 at 08:36 PM.
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Old 26th August 2012, 08:33 PM   #217
bcmbob is offline bcmbob  United States
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I thought you were close - my left ear was twitching. Congratulations !

What size transformer are you using? Can you give a little more info in your system. I'm not clear on the connections.
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Last edited by bcmbob; 26th August 2012 at 08:36 PM.
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Old 26th August 2012, 08:37 PM   #218
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Maybe we can get one more pair today for a triple play !!
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Old 26th August 2012, 09:26 PM   #219
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I'm happy
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Old 26th August 2012, 09:38 PM   #220
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Talking Smiling all the way!

Very nice. The mid-bass filled in quite nicely with some burn-in. This is a nice combination of detail and full sound. YeeHaa!

I don't have anything really good to compare it to, but so far this is clearly the best my system has ever sounded.

Someone asked for a brief description of each system. Mine is a satellite/subwoofer system. The satellite's are DIY using Dynaudio tweeter and mid-bass. These are powered by the FE. The subwoofer uses an accelerometer for a closed loop feedback and is powered by a Randy Slone 500 Watt amp. The subwoofer amp has an active crossover that splits the sub and satellite signals at line level.

Volume is currently controlled by a bare pot controlling a signal from a Yulong D18 DAC. The DAC is fed by a Squeezebox Touch that gets music at 16 bit/44k Hz by wireless from my computer and an external hard drive.

I would describe the sound of the system as a focused image, somewhat forward sound. That is probably quite different from Bob's Sunflower's which I assume gives a big image, omni speaker feel. It is quite an accomplishment that the FE seems to work very well with a wide variety of speaker types.
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