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The Borberly EB602-200 Revisited
The Borberly EB602-200 Revisited
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Old 26th March 2019, 10:41 AM   #11
EUVL is offline EUVL  Europe
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Default EB602-200 with Differential Inputs

A very good friend specially asked for a single ended headphone amplifier with balanced inputs.
The EB602-200 comes to mind as a natural choice, but the feedback resistor network is modified for that.
And since battery power is verified to give better results, it is powered with 20x AA size MiMH.
Also fitted is a buffered Danyuk crossfeed in balanced mode with volume control.




Patrick
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Attached Images
File Type: jpg 190326 EB602_Df Top.JPG (222.1 KB, 490 views)
File Type: jpg 190326 EB602_DF Ftr.jpg (208.7 KB, 395 views)
File Type: jpg 190326 EB602_DF Rr.JPG (199.9 KB, 380 views)
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Old 26th March 2019, 01:55 PM   #12
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Now playing music from my Pono Player in balanced mode.




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File Type: jpg 190326 EB602_Df Pono.JPG (266.2 KB, 350 views)
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Old 27th March 2019, 06:58 AM   #13
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Superb, as usual. Very nice case, tightly packed.
How to you handle charging the battery pack?
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Old 27th March 2019, 07:14 AM   #14
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NiMH is easy because they can take trickle charge.
So I just use +/-15V in series with a diode and a 12R resistor.
When fully discharged, the batteries are at say 1.1V per call, so the difference is 3.3V, or 280mA.
Once it reaches 1.2V per cell, the current reduces to 200mA, or 1/10.C.
When fully charged, the cells are at 1.4V each, and the trickle current is 33mA, or 1/60.C.

After 10 hours or so, you can disconnect the charger altogether.
The modern low-leakage NiMH's will keep their charge for years.




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Old 27th March 2019, 07:24 AM   #15
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The case uses an industrial extrusion from ITEM :
item Catalog - Electronic-Box Profile 8 200x120 - 0.0.452.12

You can order them cut to length, quite handy.


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Old 28th March 2019, 06:49 AM   #16
Stixx is offline Stixx  Germany
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Quote:
NiMH is easy because they can take trickle charge.
So I just use +/-15V in series with a diode and a 12R resistor.
When fully discharged, the batteries are at say 1.1V per call, so the difference is 3.3V, or 280mA.
Once it reaches 1.2V per cell, the current reduces to 200mA, or 1/10.C.
When fully charged, the cells are at 1.4V each, and the trickle current is 33mA, or 1/60.C.
Thank you! Ok, trickle charging. That's very handy, no elaborate balanced charging and such. Still have a trickle charger somewhere in the drawers...
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Old 28th March 2019, 08:26 AM   #17
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One should charge at 1/10.C at the beginning when the cells are empty to save time.
Once they are full, one should reduce to 1/40.C or lower.
This can be done easily with the right voltage and series resistor value.

The latest low-leakage cells keep their charge easily over a year.
So there is no need for continuous trickle charge.
But the trickle charge allows you to leave the charger connected even when full.
It also helps to balance the cells automatically.
So you can just leave the charger on for a day after listening, and then listen for another 6~8 hours the next day.
And when not listening for a longer period, just take the charger off after a day.

Can't do that with Lithium.




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Old 29th March 2019, 12:25 PM   #18
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Now listening to phono. All battery powered.
Not a hint of noise even on headphones.




Patrick

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File Type: jpg 190329 HL Balanced Phono.JPG (332.6 KB, 292 views)
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Old 29th March 2019, 08:10 PM   #19
Morde is offline Morde  Finland
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The Borberly EB602-200 Revisited
Nice family portrait!
Who are the members of this DIY HiFi family?
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Old 29th March 2019, 08:24 PM   #20
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From Left to Right :

Van der Veen MC 10 SUT
Other: MC10

Balanced version of Mr. Evil JFET Phono
All JFET open-loop RIAA pre-amp
(Post #31, 33)

The EB602 Differential

+/-20V PSU for the phono pre using 12x Annsmann 9V NiMH cells.
Separate supplies for L & R channels.

I think people totally underestimate how good the Mr. Evil phono is.




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