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Old 22nd May 2012, 11:05 AM   #1251
john65b is offline john65b  United States
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I like the bias readings.., you can see if it goes into Thermal Runaway...

Very cool.
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Old 22nd May 2012, 11:09 AM   #1252
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Can you share the circuit to read the bias?

D.


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Old 22nd May 2012, 03:56 PM   #1253
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hi!

its very simple: you need to put the ACS712 in series to R11, and another one in series to R12. then let the software doing the rest!

ACS712 delivers about 185mV per ampere. as you know, R11 and R12 are 0.47Ohm resistors, so it is easy to calculate the bias with the controller.

I did it all with bascomAVR, a nice basic-programming tool for the atmel C-series. If you need any help, feel free to contact me.

cheers,
matthias
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Old 22nd May 2012, 04:03 PM   #1254
Horio is offline Horio  United States
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Very well done, and what a unique build!

Do you have a photo of the back of the case? I am curious to see what the heatsinks look like.
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Old 22nd May 2012, 04:13 PM   #1255
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hey!

ufff, only an old one, without the mainpower switch and the mains-connector. but with RCA and loudspeaker out.
I made it mirror-inverted, so the other case has got the connectors exactly on the other side of the backside of the heatsinks. (I inverted the amp-pcb and the capacitor-pcb, too )

here it is:
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File Type: jpg F5_10.jpg (274.1 KB, 1884 views)

Last edited by GentryBa; 22nd May 2012 at 04:18 PM.
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Old 22nd May 2012, 05:04 PM   #1256
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Quote:
Originally Posted by GentryBa View Post
hi!

its very simple: you need to put the ACS712 in series to R11, and another one in series to R12. then let the software doing the rest!

ACS712 delivers about 185mV per ampere. as you know, R11 and R12 are 0.47Ohm resistors, so it is easy to calculate the bias with the controller.

I did it all with bascomAVR, a nice basic-programming tool for the atmel C-series. If you need any help, feel free to contact me.

cheers,
matthias
Realy nice ad on of bis settings and temperature and well evveriting

I wuld raly like to do the same on MY F5

Can you share/ post
I may even be interested in buy kit form if you make one
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Old 25th May 2012, 10:26 AM   #1257
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hi i am building my aleph 30
it is said this amp no need adjustment.
in my amp the dc at speaker out is 0 to 5mv on left, but always -22mv on right.
how to balance both amp?
thanks.

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Old 25th May 2012, 11:17 AM   #1258
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I would be more than happy with those values.
No need to adjust, really.
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Old 7th June 2012, 03:44 PM   #1259
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Default And another one

Here is my Aleph J clone .

Same look as my F5 ->

Pictures of your diy Pass amplifier

But time all is DUAL MONO .

All board are Point to Point wiring.
Layout is taken from the Aleph Wiki
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File Type: jpg IMG_1621 klein.jpg (142.0 KB, 1282 views)
File Type: jpg IMG_1625 klein.jpg (93.1 KB, 1234 views)
File Type: jpg IMG_2497 klein.jpg (97.0 KB, 1293 views)
File Type: jpg IMG_2494 klein.jpg (88.7 KB, 901 views)
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Old 7th June 2012, 05:49 PM   #1260
Zen Mod is offline Zen Mod  Serbia
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those signal wires aren't thick enough

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