Pictures of your diy Pass amplifier - Page 126

john65b · 22nd May 2012, 11:05 AM

I like the bias readings.., you can see if it goes into Thermal Runaway...

Very cool.

Nikon1975 · 22nd May 2012, 11:09 AM

Can you share the circuit to read the bias?

D.

Sent from my N-04C using Tapatalk 2

GentryBa · 22nd May 2012, 03:56 PM

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 µC-series. If you need any help, feel free to contact me.

cheers,
matthias

Horio · 22nd May 2012, 04:03 PM

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.

GentryBa · 04:18 PM

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:

Bksabath · 22nd May 2012, 05:04 PM

Quote:

Originally Posted by GentryBa

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 µC-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

wengtech · 25th May 2012, 10:26 AM

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.

Melon Head · 25th May 2012, 11:17 AM

I would be more than happy with those values.
No need to adjust, really.

Danger Mouse · 7th June 2012, 03:44 PM

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

Zen Mod · 7th June 2012, 05:49 PM

those signal wires aren't thick enough

22nd May 2012, 11:05 AM	#1251
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	I like the bias readings.., you can see if it goes into Thermal Runaway... Very cool. __________________ All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian

7th June 2012, 05:49 PM	#1260
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	those signal wires aren't thick enough __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

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22nd May 2012, 11:09 AM	#1252
Nikon1975 diyAudio Member Join Date: Nov 2009 Location: Vienna	Can you share the circuit to read the bias? D. Sent from my N-04C using Tapatalk 2

22nd May 2012, 03:56 PM	#1253
GentryBa diyAudio Member Join Date: Oct 2011 Location: Bavaria	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 µC-series. If you need any help, feel free to contact me. cheers, matthias

22nd May 2012, 04:03 PM	#1254
Horio Newbie diyAudio Member Join Date: Mar 2010 Location: San Francisco	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.

25th May 2012, 10:26 AM	#1257
wengtech diyAudio Member Join Date: Feb 2012	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.

25th May 2012, 11:17 AM	#1258
Melon Head Banned Join Date: Nov 2006	I would be more than happy with those values. No need to adjust, really.