Electronics > Projects, Designs, and Technical Stuff
Mixer - Schematic
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Jbliss:
Hi All,
I have designed a keyboard mixer for a friend, just looking for another pair of eyes to look over my design.
Mixer has 3 Stereo inputs with an active summing stage followed by a very basic EQ (treble and bass) which feeds a balanced line driver
really appreciate any feedback
(EQ has a bypass switch, unsure if I have implemented it the best way?)

Cheers
JBliss
technix:

--- Quote from: Jbliss on December 16, 2018, 11:59:40 am ---Hi All,
I have designed a keyboard mixer for a friend, just looking for another pair of eyes to look over my design.
Mixer has 3 Stereo inputs with an active summing stage followed by a very basic EQ (treble and bass) which feeds a balanced line driver
really appreciate any feedback
(EQ has a bypass switch, unsure if I have implemented it the best way?)

Cheers
JBliss

--- End quote ---
I would suggest bypassing EQ on the output side, this way you don't short the input of the EQ to its output, creating an oscillation hazard.
Jbliss:
Great idea! Shall do
Jbliss:
Hi All, I have moved further into the design process,
Now looking at possibly having the +/- 15v linear power supply on the same PCB as the Mixer? would this be a bad idea.
The Mixer will be going in to a sealed aluminium project box with 15v-0-15v toroidal transformer (20VA). I am worried that heat may become a
problem in the sealed box. I can mount the linear regulators to the project box as a heat sink ?
Thoughts?

Thanks
JBliss
technix:

--- Quote from: Jbliss on December 17, 2018, 12:23:08 pm ---Hi All, I have moved further into the design process,
Now looking at possibly having the +/- 15v linear power supply on the same PCB as the Mixer? would this be a bad idea.
The Mixer will be going in to a sealed aluminium project box with 15v-0-15v toroidal transformer (20VA). I am worried that heat may become a
problem in the sealed box. I can mount the linear regulators to the project box as a heat sink ?
Thoughts?

Thanks
JBliss

--- End quote ---
You can have the linear power supply inside the box, and mounting the power components to the metal chassis is a common way of cooling them, be it linear regulators or output power transistors. However you will need some electrically insulating thermal interface material though, as you will not want to have a short in the circuit.

Alternatively you can just use a switch-mode supply for the voltage rails. They can be built to produce low ripple outputs with little heat output, and if you are still worried about the ripple you can add a stage of LC filter to further smooth the rails out. Put the switch mode supply in a metal can of its own or use an external switch mode power brick if you are worried about the EMI.
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