unbalanced to balanced line isolator; is it this simple?

G.G.

G.G.

Well-known member
I'm looking into making a DIY line isolator for running a DSP guitar pedal direct into a PA, similar to the mono 1/4" input to XLR in the Miso direct box.

pinstripepedals.com

MISO - Mono Line Isolator | Pinstripe Pedals

From DSP Guitar Rigs to Percussion Pads the MISO is the best mono solution available for the best sound possible.
pinstripepedals.com

Pinstripe says they're using a Jensen transformer in their Miso box, and Jensen has this schematic on their web site. It seems like it has the same external jacks and switch setup as the Miso. I'm not that familiar with these, could it be this simple or is there likely some other support circuitry inside the box?

 
Yes, it is most probably just a passive DI box as in the schematic. They also have the "thru" option, which should be easy to implement..
 
so a follow-up on this one: the JT-11-DMCF in the Jensen schematic is $90 and seems a lot more heavy duty than I would expect a line out signal would require. Would any 1:1 transformer with a similar 600 ohm impedance likely work for this application?

www.parts-express.com

Jensen JT-11-DMCF Premium Line Output Transformer 1:1

Jensen JT-11-DMCF Premium Line Output Transformer 1:1If you're building your own or upgrading an existing amp or preamp, the JT-11-DMCF from Jensen is the best transformer for the output stage. Full-range frequency response is delivered with surgical precision, with multiple layers of protection...
www.parts-express.com
 
matmonster58 said:
Yes but don't go super cheap. People like oeps in some mic pres. It's probably good enoug for guitar.

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