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If your definition is different, please clarify.
You may also want to look at the schematics of guitars that uses this type of arrangement (like the Fishman Power Bridge or the Graphtech Ghost System). I'm pretty sure that the specific piezo bridge systems are active and have their own "blender" function.
These (piezo + blended magnetic) are pretty standard devices now days so I don't think you have to reinvent the wheel.
Best of luck (:
Would this be of any help?
http://www.fishman.com/files/tune_o_matic_powerbridge_installation_...Nope, that's my definition. If I understand the reason behind powering a blended mag/piezo is that a mag is DC and a mag is AC and by powering it you smoothe the amps and bring impedence down to a level that won't load the mag. If one were to convert the AC signal of the piezo prior to blend it could be managed entirely passively. I'll give the powerbridge a closer look, the schematic is interesting. I have thought of just the blend pot, but I've heard that it tends to be uneven. Thanks all
If you definition matches mine then "no" that device will appear nowhere in the circuit. It's simply not used in guitar circuitry. It's used in power supply applications (think amps and other A/C to D/C current conversion applications).
Good luck with your electronics education & best of luck with your project (:
I have used Graphtech Ghost systems and highly recommend them - they have outstanding switching, blend and buffer capabilities through hybrid plug-in switching and combine piezo and passives very well. They are compact and reliable - I like this setup for its flexibility and it works without any dickin' around trying to match components, pots and pickups etc.
I have attached a photo of just how much you can do with a Ghost system: Tele cavity - three passive pickups and an embedded Ghost pizeo set of saddles - note the blend pot and the "quick" switch (all passive/only active) and the 5 way Schaller selector for standard passives. Also note the 'plug-in' wiring at the end of the preamp board. Fitting the battery into this was done during the guitar build (its under the top off to the side of the cavity. The preamp is also MIDI capable with a piggyback circuit board (not here tho) that provides discrete string to string signals to fire effects and Syth etc. This is not a brag gig, it is what is out there for high level fits on top level instruments and works straight out of the box. The output also automatically switched from full blend mono to individual stereo depending which cable is plugged in. Nice stuff. Rusty.
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