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Old 25th February 2012, 01:28 PM   #291
PauloPT is offline PauloPT  Portugal
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Hi Harrison,

Quote:
Heres something for you to investigate
Gold over blue, many thanks!

Hi Joel,

Quote:
This is what I have come up yesterday
Good work!
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Old 25th February 2012, 03:16 PM   #292
PauloPT is offline PauloPT  Portugal
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Harrison,

is it possible to use the same transformer feeding two separate supplies, one regulated for the regulated section and other unregulated for the outputs?

And how much current the regulated section needs?

Thanks!
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Old 25th February 2012, 04:02 PM   #293
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PaulPT,
could be less than 150 mA per rail, calculate worst case current.
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Old 25th February 2012, 04:49 PM   #294
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Hi Paul,

Nicos', estimate should do . Do you have a separate winding on the same transformer? If not use another transformer.

kind regards,

Harrison.
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Old 25th February 2012, 05:36 PM   #295
PauloPT is offline PauloPT  Portugal
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Hi Harrison,

Then a small transformer will do. Nice!

Thanks
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Old 26th February 2012, 03:28 AM   #296
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Default Check this...

Hi Harrison,

Is it ok?its not yet final.

regards,
joel
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Old 26th February 2012, 02:34 PM   #297
PauloPT is offline PauloPT  Portugal
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I've been experimenting with input and VAS regulation with LM317/337 chips but I seem to prefer full amp regulation. I added a 15000uF of caps after the LT1083 the bass in good, also the dynamics are impressive. I don't know if adding this much capacitance after the chip will negate the ideia of regulation in the first place...

Anyway, does a single LT1083 per rail (Imax = 7.5A) be enough for the SYMEF?

I don't know if Joel could find away to put this regulators in the same pcb as the main amp... Just an ideia.
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Old 27th February 2012, 04:24 AM   #298
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Hi Paul,

Create a stereo amplifier of the SYMEF that you will keep constant and not modify. It will be for your listening pleasure and also for reference. You can use it for AB comparisons with the modified versions.

You may choose to use the latest PCB we are just about to roll out.

kind regards,

Harrison.
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Old 27th February 2012, 04:26 AM   #299
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Good going Drow
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Old 27th February 2012, 08:54 AM   #300
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Default Here it is...

made this pcb for SYMEF amp. with Harrison collaboration

regards,
joel
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