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I see now thanks Dougy. At first I thought both U2 and U4 were mixing both AC and DC.U3, U5 are just DC-coupled buffers.
U4 mixes the DC part of the input signals while U2 mixes the AC part of the input signals.
The AC and DC are then mixed together; U1 is a buffer for the AC+DC mix.
The inputs and output are limited to +/- 5 volts by "ESD9B5.0".U3, U5 are just DC-coupled buffers.
U4 mixes the DC part of the input signals while U2 mixes the AC part of the input signals.
The AC and DC are then mixed together; U1 is a buffer for the AC+DC mix.
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Ignoring the loss of gain due to filter roll-off, from eye I get the output equal to 1.33*(AC1 + AC2) + (DC1 + DC2); perhaps the 1.33 is to make up for the reduction in gain caused by the HPF.Now the AC/3 and DC/2 are added together. (AC/3)+(DC/2) Why?
The DC gain is set by R15 R22 and is 2x.Ignoring the loss of gain due to filter roll-off, from eye I get the output equal to 1.33*(AC1 + AC2) + (DC1 + DC2); perhaps the 1.33 is to make up for the reduction in gain caused by the HPF.
I hope you didn't design this thing!
Guys this mixer is on the market and works. I just bought the kit for my son and he loves it.I'm with the rest, don't bother trying to build this completely useless and non-working 'design', it's wrong on almost every count.
That does not make it a good product.this mixer is on the market
Here you go.may not even sim right
Guys this mixer is on the market and works. I just bought the kit for my son and he loves it.
It was designed in collaboration with Korg, one of the original synthesizer makers and it does work.
It may be an unconventional design and may not even sim right but you can try.
It has an audio out jack, so you could hook it up to some good speakers, maybe thats why all the extra parts.Here is the frequency response. The DC and AC are not the same gain by 8db. With that 1" speaker you can't hear 100hz so it does not matter. Could have been built with less parts.
Wow I find it hard to believe its that poor of a design.A mixer is an incredibly simple and easy thing to design and build, I find it hard to believe anyone with even minimal electronics knowledge could design one so poorly, there's so much wrong with it I don't have time to make a list
Its all on open PCBs, I could try and reverse engineer the boards with a good magnifying glass to check them but I have no reason to believe the schematics are not acerat.if the kit works then it's likely to be a completely different circuit to the one you posted.
It uses a 555 for the sequencer, But the oscillators are made out of opamps.Most of the noise makers for this line of products look like LM555 oscillators. 0 to 5V square wave out