Piezo Power-consumption

[Bierschinken]

Hi there,

just measured the power consumption of my Petrucci´s Piezo a few minutes ago and wanted to share with those who are interested.
My DMM said 2,58mA.

I find it pretty much compared to e.g. EMGs which draw 160µA per pickup.

Can anyone of CS confirm my results?

Swen

 

[Spudmurphy]

So (as I'm not that good at electronics) putting it into perspective, using that measurement, are you able to say roughly how long a 9V battery would last if the piezo was continuously used? - it's just that I'm not sure of the relevance of this measurement/
Says Spud out of ignorance.

 

[Larry]

So (as I'm not that good at electronics) putting it into perspective, using that measurement, are you able to say roughly how long a 9V battery would last if the piezo was continuously used? - it's just that I'm not sure of the relevance of this measurement/
Says Spud out of ignorance.

Same here, I don't really see the point

 

[glockaxis]

This measurement is just another fact that we can add in understanding and knowing the ins and outs of what make these instruments tick.... At least I think that's what was meant because I'm not only in Spud's ALOC club, but also in his Club of Ignorance when it comes to answering the op's question. LOL

 

[beej]

I think that's pretty cool, actually. But <3 mA sounds low to me- I would have expected it to be a bit more actually. Also the preamp draw should be similar for the piezo and the EMGs, I'd think (figured the EMGs would draw more- pickups + unity gain preamp).

I'm going to have to dig out my multimeter and measure the consumption on my Morse, I'm curious now.

 

[Bierschinken]

I think that's pretty cool, actually. But <3 mA sounds low to me- I would have expected it to be a bit more actually. Also the preamp draw should be similar for the piezo and the EMGs, I'd think (figured the EMGs would draw more- pickups + unity gain preamp).

I'm going to have to dig out my multimeter and measure the consumption on my Morse, I'm curious now.

Hi Beej,

that would be cool if you could do this.
Serious, the EMGs power consumption is pretty low.

And yes, by knowing the current draw you can easily calculate how long a battery works. All you have to know in addition to that is the capacitance of your battery.

Lets say you´ve got a NiMH-type accumulator with a typical capacitance of 200mAh. Then you´re preamp will work 200mAh/2,58mA = 77,5h

But keep in mind, that some batteries discharge themselves by time, so that the practical use is shorter than theoretically calculated.
There are also other effects which make differences between theory and practice but generally saying your battery works 5-10% less than claculated will work fine as a rule of thumb.

Swen

 

[Spudmurphy]

At least I think that's what was meant because I'm not only in Spud's ALOC club, but also in his Club of Ignorance when it comes to answering the op's question. LOL

as Brentrocks was always saying ROTFLMAO ... or something like that!!

Beej ... I damn well knew that it would mean loads to you !!!

 

[beej]

Reviving an old thread ... I haven't gotten to measuring the draw of my Graph Tech but was just looking at the Fishman Powerchip. It's spec'd draw is about 2.8 mA.

 

[Bierschinken]

thanks man,

seems quite similar to the pet´s draw.

Gonna ask a friend if he can measure the current draw of his EMG equipped axes.

Swen

 

[Bierschinken]

Weeell...

My friends EMG equipped axe draws 370µA, that´s a sixth of the piezos current, which is pretty amazing I think.

Swen