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Old 29th January 2009, 08:46 PM   #11
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Quote:
The amplifier is not really designed for this purpose, i have not actually reviewed this very much, but i would not recommend it, especially into 8ohms.
Has no-one used them like this? I currently drive 8 ohm speakers of a single 3886 per channel so 3 x bridged is surely going to be better and provide more power?

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You are taking about 150w per channel into 8ohms. You are fine without balanced input, you just have to use the DRV134 opamp on the inputs or equivalent.
OK, I got confused because the input connections are just + and ground. Isn't this the same as single ended? If I use a single board per channel wont I be OK if I use a preamp?

PS: sorry to ask so many questions, Im still interested ut I need to know if these things will work for what I intend to do.

Cheers,
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Old 29th January 2009, 08:52 PM   #12
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by mikesnowdon


Has no-one used them like this? I currently drive 8 ohm speakers of a single 3886 per channel so 3 x bridged is surely going to be better and provide more power?



OK, I got confused because the input connections are just + and ground. Isn't this the same as single ended? If I use a single board per channel wont I be OK if I use a preamp?

PS: sorry to ask so many questions, Im still interested ut I need to know if these things will work for what I intend to do.

Cheers,
Mike
The power output of using a single board into 8 ohms, would be just over using a single 3386, even though 3 are in use.

The board labeling does not really reflect the design purpose. This does give the impression the board can be used single ended but as i said, this is not what the designer had in mind. I would highly reccomend using two boards per channel, and a 5 balanced line converter setup.


@ Halo6, you may find this useful.

Click the image to open in full size.
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Old 29th January 2009, 08:56 PM   #13
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Thanks for the info Rhysh.
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Old 29th January 2009, 08:57 PM   #14
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by mikesnowdon
Thanks for the info Rhysh.

I have some DRV boards to hand, maybe you should have a look at my audio pages.
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Old 29th January 2009, 09:01 PM   #15
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On the SMD pads near the chips, what are the holes on the 220p & 10k pads for? Optional through hole components?
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Old 29th January 2009, 09:03 PM   #16
rhysh is offline rhysh  United Kingdom
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The schematic for the amplifier can be found
here.
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Old 29th January 2009, 09:05 PM   #17
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by mikesnowdon
On the SMD pads near the chips, what are the holes on the 220p & 10k pads for? Optional through hole components?

These small holes are called vias. This is simply to link a trace on the bottom layer copper to the top layer copper, or vice versa. Nothing needs to be done to these. They are part of the PCB itself.
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Old 29th January 2009, 09:29 PM   #18
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Whats the GBP price?
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Old 29th January 2009, 09:33 PM   #19
HaLo6 is offline HaLo6  United States
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thanks that really helps!
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Old 29th January 2009, 09:44 PM   #20
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by mikesnowdon
Whats the GBP price?

I know this is a complete pain, but i cant accept payment for boards in pounds. This is simply becuase the pcb company only takes USD. It would be a lot easier for you to pay by USD.

Just for reference, a full board set is costing about 28. ( 4 boards ). These boards are 4oz copper and bloody heavy!
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