@ Quad: Someone in AC has a spare dvb-projekt kit that you are talking of and is willing to part with it. Do you think it is a worthy buy?
Pass B1
- Thread starter sachu888
- Start date
I guess it depends on how much he wants for it, and the shipping etc.
It is a very simple board, so I guess local fabrication will be very economical.
As Omishra wrote, other than the LDRs, the rest of the components
are rather commodity stuff and will cost just about Rs 50-100 locally.
OIC. I didn't know that.
Will surely call him.
Yeah, I pinged him. Let's see, I'm interested because he is also giving matching LDRs which are difficult to get I'm told.
sachu888
Well-Known Member
Hi,
This PCB can be made within Rs100.
Regards,
Sachin
stereorules
Active Member
Can you give an indication of any final price for the entire B1 kit ? or is it now only for the PCBs ?
sachu888
Well-Known Member
Hi,
We are working to reduce its cost by substituting parts by same quality.I can only tell the cost of PCb and matched JFETs 330+200(Approx).
Total cost could be around RS 3000 IMO.
regards,
Sachin
We are working to reduce its cost by substituting parts by same quality.I can only tell the cost of PCb and matched JFETs 330+200(Approx).
Total cost could be around RS 3000 IMO.
regards,
Sachin
So this total cost means, PASS B1 (Stereo) + LDR Stereo Volume Control.
BTW, today I will look into the PCB diagram provided by quad. Looks nice. Still I feel single sided PCB will be sufficient for this.
sachu888
Well-Known Member
GeorgeO
Well-Known Member
In relation to what?
>3000 Rs. for this? it is way to expensive
>3000 Rs. for this? it is way to expensive
Om, yes, it should be doable on a single sided board as it's a really
simple circuit.
dvb_projekt went for double sided to separate the control path
from the signal path by using different layers for them.
In an offline conversation, Linuxguru suggested looking at
the "Poor Serbian Man's Attenuator, as it is a much better solution
and he also has a buffer board too.
The Poor Serbian Man's Optical Attenuator - diyAudio
Poor Serbian Man Optical Volume Control - diyAudio
One nice tip from this thread is to mount the LDRs on the copper
side, and use an aluminium plate as a thermal coupling
for temperature equalization.
** Imp to note that the LDR diode orientation must be maintained correctly if doing this **
This is to counter a critical issue with LDRs which show significant drift
with temperature.
The original lightspeed uses a wax based potting for thermal coupling
of the LDRs.
grubyhalo
New Member
sachu888
Well-Known Member
Hi,
Can we have a group buy of good quality Aluminium enclosures too?
Regards,
Sachin
Can we have a group buy of good quality Aluminium enclosures too?
Regards,
Sachin
Sure thing, why not?
Audiodoc
Well-Known Member
I am also interested in good aluminum enclosures!
stereorules
Active Member
it would be very good if it can be organized ...
sachu888
Well-Known Member
:clapping:Great effort:clapping:. This appears to be battery based. Can't we make a powered version? What about the buffer stage?
sachu888
Well-Known Member
Hi Sachin,
What I mean is, we can have a single trafo for both the B1 and the LDR and integrate the power supply circuits in the respective boards. Hope I'm not asking for too much.
Rgds
Rajesh
What I mean is, we can have a single trafo for both the B1 and the LDR and integrate the power supply circuits in the respective boards. Hope I'm not asking for too much.
Rgds
Rajesh
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