PGA2310 Line Preamplifier + Free Software

[fotios]

Originally Posted by pinkmouse

It's for a particular implementation of the DCX. What I have currently is an AV preamp that feeds the analogue inputs of the DCX, (not great gain structure for music but fine for movies and TV) and what I would like to do is use the SPDIF input on the DCX fed from a music server with a separate volume control. I'll use the input switching toggle on the DCX to drive relays so in AV mode the PGAs are bypassed, but in music mode the volume control is inline. That way I can just store two identical, ( or different! ) programs in the crossover and not worry about setting output levels on the new volume control every time I want to use the system in AV mode.

Remote control would be nice, but I'm not too fussed about a LCD or even balance controls, as long as the PGAs all clock up and down at the same rate that will do the job adequately.

I suppose in an ideal world each channel would have programmable offsets for balancing outputs to differing sensitivity drivers so you can bypass the digital attenuation in the DCX, but I could live without that. I basically just want something cheap and simple that'll fit in a small external case, or even internally in my modded DCX.

Hi Al
From those that i understand your intention is to manage the volume level of 6 channels simultaneously. A 3 way stereo electronic x-over offers 3 outputs (Low-Mid-High) per channel, so total 6 outputs.
I don't know something about this DCX, but from those you refer i can perceive that its headroom is some small. Using 3 PGA2310, you could get same volume level and more gain at the same time.
To manage just the gain of the 3 PGAs, is very simple. There is no need for a big micro like this on the current project, a 18 pin device can do the job just fine. The only external part needed is the encoder, so 2 - 3 inputs. Outputs to manage 3 PGAs are the same: CS - SDI - SCLK. The program code will be very small.
Well, tell me if you have available a PIC programmer. In this case i could post you the program in HEX file. Then you will be able to test the program on actual project and you will notify me if there is need for any correction.

[atupi]

Hi Fotios, i'm paying a lot of attention to this thread having a strong need to build a source selector for my amplifier. Do you sell also some pcb's or publish some pdf to etch opur ouwn boards ?

Ps. It's possible to come to Thassos this june

[fotios]

This is my last post in this already polluted thread, and i simply publish the last and definitive upgrade on which i am working. The preamplifier will have the shape appears in the block diagram. I am already working on the upgraded program and the microcontroller used is a PIC18F45K22. The display is also changed to 2 lines X 20 characters. Of course i will provide you again with all the necessary schematics and artworks to make your own PCBs and the program of microcontroller. I will also provide you with ready made PCBs for the analog part and the control board.
I ask your patience for few days.
We meet again in a new thread
Thank you.