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PROJECT UPDATE: β24 BI-AMPING

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Re: PROJECT UPDATE: β24 BI-AMPING

Postby amb » February 24th, 2017, 9:53 am

Excellent!
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Re: PROJECT UPDATE: β24 BI-AMPING

Postby SonusBonum » February 24th, 2017, 12:13 pm

After perfectly balancing the VAS stage with VR4 there's about 200mV DC on the speaker outputs. That DC can be reduced to 0 with VR4 but than there's no balanced VAS anymore. What to do...?
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Re: PROJECT UPDATE: β24 BI-AMPING

Postby SonusBonum » February 24th, 2017, 12:30 pm

Never mind, found it already in the Pinnocchio post "Higher Bias for β24"... Right...?
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Re: PROJECT UPDATE: β24 BI-AMPING

Postby amb » February 24th, 2017, 12:38 pm

SonusBonum wrote:Never mind, found it already in the Pinnocchio post "Higher Bias for β24"... Right...?

Correct!
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Re: PROJECT UPDATE: β24 BI-AMPING

Postby hagak » February 24th, 2017, 12:43 pm

Awesome! Also love the Squeezebox, did not know they made Transporters without the Haptic Knob. I guess they did that when the supplies for that part dried up. Wonder why no one makes haptic controllers like that anymore, very handy for its use case.
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Re: PROJECT UPDATE: β24 BI-AMPING

Postby SonusBonum » February 24th, 2017, 2:19 pm

Thank you Ti, thank you Hagak... More pics and clips will follow as soon as the amps are installed in the livingroom.
I like the SlimDevices/Logitech Transporters a lot. I have several, both with and without the knob.
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Re: PROJECT UPDATE: β24 BI-AMPING

Postby SonusBonum » February 27th, 2017, 11:20 am

First set is ready to go. Hope it's "cool" enough... LOL

IMG_4430.JPG


IMG_4446.JPG


IMG_4448.JPG
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Re: PROJECT UPDATE: β24 BI-AMPING

Postby amb » February 27th, 2017, 11:25 am

Interesting! Kind of steampunk styling, I like it.

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Re: PROJECT UPDATE: β24 BI-AMPING

Postby SonusBonum » February 28th, 2017, 4:32 am

Here some more data:

Total weight per channel (2 amps, 1 power): 70kg (154lbs)

Temperatures of the device after 1 hour idle at 1.4A class A:
D7, D8, D9, D10 : 70C (158F)
Q33, Q35, Q35, Q36: 70C (158F)
Q37, Q38, Q39, Q40: 55C (131F)
Q21, Q22, Q23, Q24: 50C (122F)
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Re: PROJECT UPDATE: β24 BI-AMPING

Postby daniele86 » February 28th, 2017, 1:14 pm

Nice build! High temperature for your big heatsink!

Which is your room temperature?

Do you know temperature coefficiente °C/W of your heatsink?

Thanks!
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