Search found 6 matches

by AdAstra
Mon Nov 09, 2015 11:31 am
Forum: Pro Audio Design
Topic: Basic Mixer - 1646 output stage - seeking critique
Replies: 14
Views: 33776

Re: Basic Mixer - 1646 output stage - seeking critique

Ok, one more update. This is a bit cleaned up and now has a single 2134 stage feeding PGA, then PGA driving 1646. Did a bit of re-routing and cleanup, and made the 15v+- rails bigger. http://i33.photobucket.com/albums/d88/brentlind/1646-SCHEM1.jpg http://i33.photobucket.com/albums/d88/brentlind/1646...
by AdAstra
Sun Nov 08, 2015 5:02 pm
Forum: Pro Audio Design
Topic: Basic Mixer - 1646 output stage - seeking critique
Replies: 14
Views: 33776

Re: Basic Mixer - 1646 output stage - seeking critique

Ok, I think I updated the switching as described, here's another drawing:

Also, each bus gets 8 relay-switched inputs, and a couple hardwired inputs, so 10 inputs per bus maximum.

Image
by AdAstra
Sun Nov 08, 2015 4:47 pm
Forum: Pro Audio Design
Topic: Basic Mixer - 1646 output stage - seeking critique
Replies: 14
Views: 33776

Re: Basic Mixer - 1646 output stage - seeking critique

Extremely helpful, I appreciate all replies. I had missed the last few in a flurry of activity over the weekend. But as you can see in updated schematic, it should be quite simple to add grounds on pin 2 of the relays. The current schematic has the PGA sitting between the to 2134 stages, I figured t...
by AdAstra
Mon Nov 02, 2015 4:32 pm
Forum: Pro Audio Design
Topic: Basic Mixer - 1646 output stage - seeking critique
Replies: 14
Views: 33776

Re: Basic Mixer - 1646 output stage - seeking critique

Ha, thanks John. So, forgetting my "simple" adjective for a moment, if I wanted to implement a PGA volume control in this circuit, could I simply insert a PGA2320 between the second 134 stage and the balancing stage? http://i33.photobucket.com/albums/d88/brentlind/1646%20Summing%20Board%20...
by AdAstra
Mon Nov 02, 2015 12:41 pm
Forum: Pro Audio Design
Topic: Basic Mixer - 1646 output stage - seeking critique
Replies: 14
Views: 33776

Re: Basic Mixer - 1646 output stage - seeking critique

My bad, I meant to make a note about those caps. I intended to use BPs, I just couldn't find an appropriate symbol for the Elna I wanted to use.

Thanks for the feedback. I'm a little shocked, I was expecting someone to say the circuit was a mess.
by AdAstra
Mon Nov 02, 2015 11:08 am
Forum: Pro Audio Design
Topic: Basic Mixer - 1646 output stage - seeking critique
Replies: 14
Views: 33776

Basic Mixer - 1646 output stage - seeking critique

Hello, I'm trying to design a simple mixer for utility purposes in my live mixing work. I've pieced together this bus assignment and output stage based on THAT datasheets and so on, but I'm sure its got some problems. Any guidance would be much appreciated as I'm a hack/hobbyist, not a real engineer...