BPA300 Round 2

[mikesnowdon]

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?

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,
Mike

[rhysh]

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.

[mikesnowdon]

Thanks for the info Rhysh.

[rhysh]

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.

[mikesnowdon]

On the SMD pads near the chips, what are the holes on the 220p & 10k pads for? Optional through hole components?

[rhysh]

The schematic for the amplifier can be found
here.

[rhysh]

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.

[mikesnowdon]

Whats the GBP price? £££££

[HaLo6]

thanks that really helps!

[rhysh]

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!