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| | |-+  HRM 3 way mid boost wiring help
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Author Topic: HRM 3 way mid boost wiring help  (Read 2681 times)
mwdavis14
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« on: January 22, 2014, 02:29:47 PM »

Hi all,

I'm building an HRM Bluesmaster w/3 way mid boost tweak.  Attached is Nik's schematic for wiring it.  Problem for me is that I cannot get the 390pf resistor, the lead from the board and the 4m7 resistor to fit in the same hole on that tiny switch.  I'm sure its a skill issue, but I have still repeatedly failed.  In any event, with the extra components provided by Nik for the mod, I have two 390pf resistors.  So, I thought of putting one 390 in the top slot, the second in combination with the 330 in the bottom slot, and route the wire from the main board & the 4M7 resistor in the R mid spot on the switch.  The wire from the treble pot would run in isolation to the L mid spot on the switch. 

Based on my NOOB understanding of how the switch functions, I can't see how this would not work, but I'm hoping someone here can verify that its the functional equivalent of Nik's layout (albeit a less efficient use of components).  The switch is an ON-OFF-ON.  So, it seems to me that as I've proposed the layout when the midboost is active and the 3 way switch is in "OFF", the signal from the main board will be routed through the 4M7 to ground.  In one "ON" position, the 390pf will be added, and in the other "ON" position both the 330 and the 390 will be added.  This should be the same as Nik's, correct?   

Finally, I don't see a need to bridge the mid poles w/this proposal.  Can someone w/more knowledge than me confirm this?

Thanks very much for your help!
Mark


* 3 Way Mid Boost.jpg (566.9 KB, 314x154 - viewed 726 times.)
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