Pigtronix Keymaster

drbob1 · Post by **drbob1** » 01 Jul 2011, 01:55

Whatever else is going on, Dave Kotai (and Howard Davis of DMM fame) seem to be keeping busy! This is an impedance matching dual loop device with series/parallel switching for the A & B loops and a blend control and boost for both. The demo unit at HC http://www.harmonycentral.com/docs/DOC-1875, is SMD with a strange resistor jumpered across the board, so points lost for neatness (and shrink wrapping those resistor leads wouldn't have hurt). Still, a cool concept that would require more than the usual $30 worth of parts to put together. The only drawbacks I can see are no phantom power for condensor mics and no transformers for isolation so ground loops could be a problem.

drbob1 · Post by **drbob1** » 01 Jul 2011, 16:17

Here's the gut shot from HC:

Emanuele · Post by **Emanuele** » 02 Jul 2011, 17:51

I wonder how it could do reamping without audio transformers..I've never seen active reampers, and I've always tought it would be nice something like that!

drbob1 · Post by **drbob1** » 02 Jul 2011, 21:57

I'm admittedly a neophyte at this stuff, but can't you use op-amps to match impedance. In this case going from the low impedance output of the recorder to a higher impedance for input to the guitar amps/boxes?

Emanuele · Post by **Emanuele** » 03 Jul 2011, 16:56

drbob1 wrote:I'm admittedly a neophyte at this stuff, but can't you use op-amps to match impedance. In this case going from the low impedance output of the recorder to a higher impedance for input to the guitar amps/boxes?

I'm a newbie too, but some times ago a friend mine asked me to build a reamp box, so I did some research and I found only passive projects, and the bad thing is that those boxes require really high end transformers wich are quite rare to find too!
Maybe they want transformers because the windings are similar to a real pickup?

drbob1 · Post by **drbob1** » 03 Jul 2011, 18:48

For an inexpensive reamp box, passive direct boxes installed backwards actually can work. Input to the XLR and output from the 1/4".

sadrew · Post by **sadrew** » 24 Feb 2012, 13:15

very interesting pedal! it's a pity we can't trace a schematic because of smd components.

maybe we have a diy alternative?

i know the paralooper from moosapotamus, but i'm specifically interested in the active debalancing/balancing circuit.

something available around here?