I've been working on this design over the last week.
It's a input buffer circuit with LM2940 and LM2990 voltage regulators.
The LP filter is set to approx 3hz and the HF Filter to 100-140 Khz.
These values were suggested by Peranders (thank you).
Any comments/suggestions?
The red is the top layer with all the tracks.
Blue is vias and green is the bottom layer(Ground plane).
Here's the PSU Schema
It's a input buffer circuit with LM2940 and LM2990 voltage regulators.
The LP filter is set to approx 3hz and the HF Filter to 100-140 Khz.
These values were suggested by Peranders (thank you).
Any comments/suggestions?
The red is the top layer with all the tracks.
Blue is vias and green is the bottom layer(Ground plane).
Here's the PSU Schema
Attachments
If you require professionally made PCB's, give www.pcbfabexpress.com a try. For a board like yours, it will cost US$13 each (minumum order of 5pcs) plus overseas shipping.
If you have one or two people interested, that ought to make the cost reasonable.
Disclaimer: My only relationship with them is that of a happy customer.
Back to the pre-amp, it seems fairly basic. Is that what you really want? Suggestions for improvement might be something like a buffer followed by the volume control, then an active gain stage (2 op-amps per channel). Other enhancements might be separate regulation (if not separate rails altogether) for each channel, use of good quality opamps and potentiometers, improved decoupling/filtering, relay-switched output, optional output coupling cap, etc.
If you have one or two people interested, that ought to make the cost reasonable.
Disclaimer: My only relationship with them is that of a happy customer.
Back to the pre-amp, it seems fairly basic. Is that what you really want? Suggestions for improvement might be something like a buffer followed by the volume control, then an active gain stage (2 op-amps per channel). Other enhancements might be separate regulation (if not separate rails altogether) for each channel, use of good quality opamps and potentiometers, improved decoupling/filtering, relay-switched output, optional output coupling cap, etc.
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