[sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??

[Jean-Pierre Desrochers]

So starting with the mixer schematic Jesse kindly proposed

What would you suggest as a final ‘transmitting’ load
for all 4 mixed frequencies ?

 

Looking at what people suggested it looks like
a loop antenna with low Q (adjusted for 500Khz to 1700Khz) would do ?



P.S. After the next replies I will close this discussion as it is (and always has been)
out of topics for Synth DIY.. Thanks for you guys who kindly offered your help !

 

*********************************************************************

 

Yep, there's a vibrant analog video synth community these days using that same old tech from back when. Eurorack even.

 

LM6172 is a nice little dual opamp with something like 80mhz bandwidth IIRC. Theyre easy to use because it's fine w +-12V rails. The DIP version just went end of life a few weeks ago, SOIC package is still being produced. Just mind the datasheet, it likes a 1k feedback resistor.

 

Here's a little summing mixer schematic maybe it'll be useful to you.

 

2mhz is nbd, I wouldn't sweat it too much.  We're a bunch of amateurs monkeying w 60-80mhz for vertical rate stuff and seems like most people's PCB's aren't laid out with any kind of understanding of signal integrity whatsoever and it all works just fine.

 

Uninterrupted ground planes are your pal 

 

You could probably ask on LZX Community Forum if you run into snags, there's a handful of video DIYers there that kick schematics around and tend to be helpful. There's a discord as well 

 

Cheers,

Jesse

 

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