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PostPosted: Fri Apr 21, 2017 11:21 am 
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Though they were designed for use in the new Crown Jewel kit, those little boost modules would be great in a stand-alone boost pedal with the same 2x4 pin plug-in set-up that the CJ uses. A small enclosure with a stomp switch, LED, level pot, I/O jacks, a DC adapter/battery hookup and the plug-in boost module assembly and away you go. But it's not quite that simple, because of the different power requirements of the available boost modules.

Just a simple +9V supply will work for the LPB, MOSFET and Electra boosts, but the other three modules have different power/ground arrangements. The Treble boost needs -9V for the PNP germanium transistor, the 18V JFET boost needs (obviously!) +18V, and the 27V boost needs +18V and a -9V ground to provide that large voltage range, plus +4.5V for the op amp in that circuit. The boost modules are already set up with the connections for these various voltages through the two 4-pin connectors. But there's still the matter of providing those various voltages....

It would certainly be possible to get a charge pump and rig up your own circuit to provide the +18V and -9V sources, but since I'm incorrigibly lazy, it occurred to me that this would be a great application for Madbean's little Road Rage circuit (two PCB's for $4). The only thing left to address is the +4.5V op amp voltage supply, and that's easily done with a simple two-resister voltage divider off the +9V supply.

So what to connect the Road Rage outputs to and plug those boost modules into? BYOC provides the obvious answer for that, too: one of the new Experimenter boards! They've already got the correctly spaced connection eyelets for the Boost modules to plug into (see photo below), so you would just need two of the little 4-pin female sockets like the Crown Jewel PCB uses (not the male ones shown in the photo!). Your various Road Rage voltage output connections can then be made to the Experimenter PCB, and there's plenty of room left to install the 4.5V voltage divider and the LED's CLR, as well.

Now on to the "verification" stage: I've got some Road Rage boards and LT1054 charge pumps on order and everything else on hand, so we'll give this little project a try. Will post more on this in the next week or so....

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PostPosted: Fri Apr 21, 2017 11:53 am 
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Awwww yeah! DVM putting on the mad scientist goggles. I'm keeping an eye on this for sure!

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PostPosted: Fri Apr 21, 2017 12:22 pm 
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Why not just build the power supply circuit on the "mother" experimenter board? It's just a charge pump, 4 x 10uF electrolytic caps, and 2 diodes. Then 2 resistors and another electrolytic for the voltage divide. It should fit pretty easily. Put the components on one side of the board, and the sockets on the other.

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PostPosted: Fri Apr 21, 2017 1:11 pm 
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Subscribed.

(always wanted to post that :P)


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PostPosted: Fri Apr 21, 2017 6:00 pm 
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I'm planning a 'meaty' one knob fuzz for one of the experimenter boards. :mrgreen:

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PostPosted: Fri Apr 21, 2017 7:07 pm 
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byoc wrote:
Why not just build the power supply circuit on the "mother" experimenter board? It's just a charge pump, 4 x 10uF electrolytic caps, and 2 diodes. Then 2 resistors and another electrolytic for the voltage divide. It should fit pretty easily. Put the components on one side of the board, and the sockets on the other.

Yeah, that would certainly work, too. But I've got those Road Rage boards on the way and there's also that "lazy" thing I mentioned. :mrgreen: But it would definitely save some space, so I'll have to try that layout on the 2nd one I make, which I want to try mounting in one of the "micro" pedal enclosures!

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