Is this pre amp like a balanced version of TI buffered attenuator test board?
http://www.ti.com/tool/TIPD136
http://www.ti.com/tool/TIPD136
Since the Maya solution with VolCB is no longer available, and Arduino solutions are coming up, I could provide this PCB if there is still demand for.
Hans
Dear Hans, the Arduino solution to replace Maya VolCB would be very welcome. A specific reason to this is that Arduino programming is familiar to many of us. This fact enables customization of the system according to personal needs. It woud be a nice feature if also input selection is included in the solution.
If I have a single ended source going into BPPBP, am I still getting BAL output?
Yes
Since there are regularly people asking for PCBs:
I have a few (six as of right now) of the original PCB that I could spare. Green soldermask, leaded HASL, 1oz/35µm copper layers, 140-150°C TG FR-4. I am asking for what I paid a piece (2,50€) + postage within the EU from Germany.
Apart from that I would also appreciate an arduino based version of a VolCB.
I have a few (six as of right now) of the original PCB that I could spare. Green soldermask, leaded HASL, 1oz/35µm copper layers, 140-150°C TG FR-4. I am asking for what I paid a piece (2,50€) + postage within the EU from Germany.
Apart from that I would also appreciate an arduino based version of a VolCB.
Controlling VolCB with Arduino
I did attach a sample sketch to post #889. It is functional but rather basic and was intended as a starting point. There seems to be interest in a more complete solution.
What features do you think an Arduino sketch needs in order to be useful?
I did attach a sample sketch to post #889. It is functional but rather basic and was intended as a starting point. There seems to be interest in a more complete solution.
What features do you think an Arduino sketch needs in order to be useful?
I'm frequently questioned concerning the IM23TS relay that I used for the volume control boards.
These relays were long time out of stock, but momentarily Farnell has a few thousands of them.
But in case using another relay, be aware that the PCF8574AT driver can only sink 80mA.
So with 6 relays, that's a max of 13mA per relay.
However the pin replaceable PCA8574AD can sink 200mA or 33mA per relay giving you more options for a relay selection.
Hans
They're still there, 700 left..
https://uk.farnell.com/te-connectivity/im23ts/relay-signal-dpdt-250vac-220vdc/dp/1629004
Have they always been £3 each?
What would be the proper way of connecting RCA jacks to the inputs, since my sources are all unbalanced at this point?
Alternatively, to fit with any other design, you can buy RCAs in XLR-style back panel fittings, e.g. :
Neutrik NF2D-B-0 RCA Panel Mount Jack w/Colored Isolation Washer Black
Then you connect it to the board as set out in Bruno's paper .
Hans: I'll email you later. I may need 3 vol PCBs
That’s o.k.
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