Red wire is on the right on both PCB's. The three blue Maya wires on the left are not used.
Yes. And there was similar with the choice of and resistors if using a completely unpopulated board. Emyeuoi first mentioned it I think so I was carefully to check the caps people had actually used rather than those on BOM..
BPPBP case
I went with the DIY store case, 1U Galaxy w/steel covers. Like you I don't like drilling close holes. Someone on the forum had a DXF drill pattern. I took it into FPD and added my IEC cutout.
The CNC and lettering basically doubled the cost, but made life so much easier.
I went with the DIY store case, 1U Galaxy w/steel covers. Like you I don't like drilling close holes. Someone on the forum had a DXF drill pattern. I took it into FPD and added my IEC cutout.
The CNC and lettering basically doubled the cost, but made life so much easier.
Attachments
To my ears the BA3/F4 combination is more tube like, probably due to the ability to tune the second and third harmonics to taste. Seems more warm than the BPPBP. This to my ears is not bad, the BPPBP /F4 combo is very clean.
I have just paired the BPPBP with my Pass F6 with a Mitsubishi DA-F20 tuner. To my ears this is a winner for me listening on FM. Haven't tried it with another signal source yet.
This is a bit from the fmtunerinfo site regarding one reviewers thoughts on the DA-F20,The Mitsubishi's midrange was very focused and believable. In comparison, the sound was a step more forward. It definitely kept me interested in the music. The DA-F20's highs were more extended while still sounding like a real part of the music. Stereo imaging was precise. The midrange seemed just right with a nice open quality. Everything seemed just about right, to such a point that I gave up looking for flaws between the two. It was seductive in a toe-tapping, not sleepy, sort of way.
So to my ears this is a win win.
I have just paired the BPPBP with my Pass F6 with a Mitsubishi DA-F20 tuner. To my ears this is a winner for me listening on FM. Haven't tried it with another signal source yet.
This is a bit from the fmtunerinfo site regarding one reviewers thoughts on the DA-F20,The Mitsubishi's midrange was very focused and believable. In comparison, the sound was a step more forward. It definitely kept me interested in the music. The DA-F20's highs were more extended while still sounding like a real part of the music. Stereo imaging was precise. The midrange seemed just right with a nice open quality. Everything seemed just about right, to such a point that I gave up looking for flaws between the two. It was seductive in a toe-tapping, not sleepy, sort of way.
So to my ears this is a win win.
Hi Hans and others
I am planning to design my own board based on Bruno's and Hans' designs; I need my own board to meet certain form factor. I have decided to go for relay stepped attenuator with external control lines and possibility for microcontroller.
Do you still recommend using the same relay-resistor scheme as have been published by Hans, or would you change something for a new design (that does not need to be compatible with the existing BP board)? I have browsed through the thread and debates regarding various forms of volume control but understood most still prefer stepped attenuator inside the feedback loop.
Any other modifications you would do? Someone in the beginning of the thread mentioned Whitlock's bootstrapping that is now patent-free but I did not see it mentioned later on.
Edit: I found the remote control thread only now. So I assume the latest stepped attenuator version is this 6-relay version on that thread.?
I am planning to design my own board based on Bruno's and Hans' designs; I need my own board to meet certain form factor. I have decided to go for relay stepped attenuator with external control lines and possibility for microcontroller.
Do you still recommend using the same relay-resistor scheme as have been published by Hans, or would you change something for a new design (that does not need to be compatible with the existing BP board)? I have browsed through the thread and debates regarding various forms of volume control but understood most still prefer stepped attenuator inside the feedback loop.
Any other modifications you would do? Someone in the beginning of the thread mentioned Whitlock's bootstrapping that is now patent-free but I did not see it mentioned later on.
Edit: I found the remote control thread only now. So I assume the latest stepped attenuator version is this 6-relay version on that thread.?
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How feasible is it to run a BPPBP as an output stage for a DAC in terms of gain/distortion and impedance matching? Am just thinking about whether to use two in a system to create a balance output for a DAC to bypass it's single ended output stage which would then go to a fully featured BPPBP preamp anyway.
Sorry, I should rephrase that..
Differential output, not balanced! Would effectively just be acting as a replacement for the original output stage (a commercial dac that had a balanced option and therefore blanks over the XLR socket holes) so that it could still interface ok with any other regular system.
Differential output, not balanced! Would effectively just be acting as a replacement for the original output stage (a commercial dac that had a balanced option and therefore blanks over the XLR socket holes) so that it could still interface ok with any other regular system.
Selling my BPBP .....
Hi !
I finally decided to stay with my Douglas Self Linear audio #5 preamp for it's
balance and tone control.
I built my BPBP a few months ago (group buy 3), it has its Hypex regulators,
and working fine.
Not boxed. That's all that will be left for you to do !
Excellent power supply (+/- 15V regulated), with toroid transfo also for sale, with the BPBP or separately.
Please PM me if interested.
Price: board and parts ........ I'll have to check for this.
JM
Hi !
I finally decided to stay with my Douglas Self Linear audio #5 preamp for it's
balance and tone control.
I built my BPBP a few months ago (group buy 3), it has its Hypex regulators,
and working fine.
Not boxed. That's all that will be left for you to do !
Excellent power supply (+/- 15V regulated), with toroid transfo also for sale, with the BPBP or separately.
Please PM me if interested.
Price: board and parts ........ I'll have to check for this.
JM
I finally gathered all the invoices.
BPBP with hypex reg, Mouser parts etc : 140 Euros + shipment
Regulated PSU (230/240V toroid xfo) +/- 15V : 30 Euros + shipment
ALPS RK40312 10K linear pot (never used) : 55 Euros + shipment
JM
Hi all
In some earlier posts I noticed someone asking for a simple way to drive the 6-bit Hans relay volume.
I think this could be an easy and user friendly way to do it:
Two 74LS90 BCD up/down counters, clocked by a 555 circuit, driving two 74LS47 that in turn drive two 7-segment displays.
The BCD output from the two 74LS90 is then converted to binary by a 74LS184 controlling the relays in Hans circuit.
The 555 circuit could even be speed adjustable, so you can get fast to the volume setting you want.
Any comments?
In some earlier posts I noticed someone asking for a simple way to drive the 6-bit Hans relay volume.
I think this could be an easy and user friendly way to do it:
Two 74LS90 BCD up/down counters, clocked by a 555 circuit, driving two 74LS47 that in turn drive two 7-segment displays.
The BCD output from the two 74LS90 is then converted to binary by a 74LS184 controlling the relays in Hans circuit.
The 555 circuit could even be speed adjustable, so you can get fast to the volume setting you want.
Any comments?
And instead of using relays, why not use a MAX5389 digital (dual even) potentiometer??
Here is a link:
https://www.maximintegrated.com/en/...onverters/digital-potentiometers/MAX5389.html
Here is a link:
https://www.maximintegrated.com/en/...onverters/digital-potentiometers/MAX5389.html
Apparently, Bruno inadvertently used a logarithmic, instead of a linear, pot in the measurements he made, see the discussion on this link:
The G word: Demo project - A balanced volume controller | EDN
Regards,
Braca
The G word: Demo project - A balanced volume controller | EDN
Regards,
Braca