Info on EMG ES-918??

[Govmnt_Lacky]

Does anyone have one OR have diagrams for the EMG ES-918 active pickup external battery box? I would love to build one of these 

[Groovenut]

I dont have any info, but what if it is literally whats written on the top of the case with a mute switch?

Power supply to the ring of the instrument cable, signal to the tip. Uses a stereo cable from the guitar to the box and mono cable to the amp.

My 2 cents worth

[Govmnt_Lacky]

I dont have any info, but what if it is literally whats written on the top of the case with a mute switch?

Power supply to the ring of the instrument cable, signal to the tip. Uses a stereo cable from the guitar to the box and mono cable to the amp.

My 2 cents worth

That thought had crossed my mind..... BUT

I am holding out hope that the ~$90 retail price is justified by more than that  Would still like to see the guts on this

[digi2t]

I have to side with groovers on this one. I think you would probably be surprised/shocked at what your 90 clams were buying.

- footswitch - $4
- jacks - $5
- wiring - $1
- enclosure - $80

Aimed at folks who don't know any better. $129 direct from EMG  .

Here's the instructions...

http://www.emgpickups.com/media/productfile/e/s/es-918_0230-0312_2016.pdf

Like I said, I think groovers had this pegged.

[Govmnt_Lacky]

I have to side with groovers on this one. I think you would probably be surprised/shocked at what your 90 clams were buying.

- footswitch - $4
- jacks - $5
- wiring - $1
- enclosure - $80

Aimed at folks who don't know any better. $129 direct from EMG  .

Here's the instructions...

http://www.emgpickups.com/media/productfile/e/s/es-918_0230-0312_2016.pdf

Like I said, I think groovers had this pegged.

Yeah. I am getting that feeling about it's simplicity.

One thing I haven't been able to find (other than a schematic or pic of internals) is info on resetting the "resettable fuse" that is installed to prevent shorting. The instructions mention it and what it is for BUT, no mention about where it is or how to reset it    I am also interested in whether or not any power filtering was implemented for either battery or DC wall wart power.

[Aph]

Hey, come on guys... it's got room for TWO batteries.
And digi2t you forgot this:

- voltage selector switch - .50

I hope you feel foolish now! 

[digi2t]

Hey, come on guys... it's got room for TWO batteries.
And digi2t you forgot this:

- voltage selector switch - .50

I hope you feel foolish now! 

Oh woe is me.

OK, meat and taters time. Additional filtering for powers supply powering.... doubtful. From the instructions;

Using an AC Adapter (Battery Eliminator):
Using an AC Adapter is not a great idea. They tend to be noisy. EMG has yet to spec or design an AC Adapter. Effects pedals tend to be noisy because they usually
add a lot of gain. Since the pickup is the first element of the chain it's best for it to have as quiet a power supply as possible, thus a battery.
If you can tolerate the extra noise from an adapter the choice is yours.

As for the "resettable fuse", probably snake oil speak for some kind of reverse polarity protection. Diode, zener, MOSFET... your choice.

Belay that. Maybe something like this;

http://www.littelfuse.com/products/resettable-ptcs/surface-mount/microsmd/microsmd005f_2.aspx

I mistook the description for reverse polarity protection. The resettable fuse is in case you plug the mono plug into the stereo jack, thus shorting the power ring to ground. They state current draw at 50mA, so I suppose the fuse would something like 80mA@30V.

[PRR]

> resetting the "resettable fuse"

Most USB ports have that. It is user-transparent. When you remove the short, it cools and "resets" before you can plug in something else.

[highwater]

Smallbear sells a through-hole version in a few different current ratings, and Wikipedia has a decent article on them.

They're actually very similar to the old amp-tech trick of sticking a lightbulb in the power cord so that you have time to turn the power back off if the broken amp has a short. The fancy part is that they have a low-enough "cold" resistance to stay out of the way until there's a fault.

That they're called "resettable fuses" is, unfortunately, rather confusing. (and could even be dangerous if they weren't fairly obscure -- replacing a normal fuse with one of these would usually be a Bad Idea™, and there are far too many people who would do exactly that)

[thermionix]

old amp-tech

I'm not that old!

low-enough "cold" resistance

Not unlike using a high-wattage bulb.  I usally use a 100W, low power amps hardly notice it's there, and vice-versa.