| Author |
Topic: Pickup Impedance |
Steven Paris
From:
Los Angeles
|
Posted 1 Jul 2019 8:44 am |
|
I am trying to determine the source impedance of a "typical' steel guitar pickup; using the formula Z=√R2+XL2 to account for both DC resistance and inductance. Does anyone have a list of various popular pickups' specs?
_________________
Emmons & Peavey |
|
|
 |
Michael Butler
From:
California, USA
|
Posted 1 Jul 2019 10:39 am
|
|
i don't know for sure but i'd check first with seymour duncan as well as other pickup manufacturers and sites that review pickups.
play music!
_________________
please see my Snakeskin's Virtual Music Museum below.
http://muscmp.wordpress.com/ |
|
|
|
Donny Hinson
From:
Glen Burnie, Md. U.S.A.
|
Posted 2 Jul 2019 9:32 am
|
|
| For the BL pickups, I've heard that the first number in the pickup type is actually the inductance of the pickup. So, a BL710 would be 7 henrys, the BL910 would be 9 henrys, and so on. But I'm not sure what I would do with that info. Sound is what I look for, not numbers, because other things than inductance come into play where sound is concerned. |
|
|
|
Greg Cutshaw
From:
Corry, PA, USA
|
Posted 2 Jul 2019 10:09 am
|
|
For my graduation project I designed an amp and modeled the guitar's magnetic pickup in Spice. I used a signal generator with series inductance (which dominates at audio frequencies) and resistance and then a series capacitance with the signal to the amp tapped off of the capacitance much like this:
That image was provided from this web site:
https://www.buildyourguitar.com/resources/lemme/
Pretty sure the inter-winding capacitance is significant as is the modeling of the connecting cords and amp and any buffer. With cheap cables the connecting cable capacitance can greatly exceed the winding capacitance. The model does not really address the magnet circuit at all. The passive pickups I've recently tested in my amp reviews put out in the range of 230 to 450 mV. Of course the above model is only an approximation and does not account for the non-linearity of the pickup's response to different signal levels.
IMO the referenced article also explains why inserting a buffer after the pickup destroys the intended warm response and design of the pickup and system by removing the effect of the cable capacitance.
Last edited by Greg Cutshaw on 2 Jul 2019 10:42 am; edited 1 time in total |
|
|
|
Steven Paris
From:
Los Angeles
|
Posted 2 Jul 2019 10:36 am
|
|
Thanks, for the link!! Good article.
_________________
Emmons & Peavey |
|
|
|
Greg Cutshaw
From:
Corry, PA, USA
|
Posted 2 Jul 2019 10:52 am
|
|
Pickup electrical values (from the site referenced above). Note how the system's additional capacitance affects the resonant frequency:
 |
|
|
|
