Joseph J. Rogowski
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  • Barnegat, NJ
  • United States
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Joseph J. Rogowski's Discussions

Simple Moving Coil Pickup

Started this discussion. Last reply by darryl kernaghan Oct 23. 4 Replies

For all you guys making a wide variety of stringed instruments here is a new way to make a quick and simple pickup. All you need is a small, miniature audio transformer with 8 ohms on one side and…Continue

 

Joseph J. Rogowski's Page

Latest Activity

darryl kernaghan replied to Joseph J. Rogowski's discussion Simple Moving Coil Pickup
"That will also work without a transformer if you use wound strings, and use the magnet as a slide"
Oct 23
darryl kernaghan replied to Joseph J. Rogowski's discussion Simple Moving Coil Pickup
"Yes Joseph, it works very well, I stumbled apon it during our alumitone pick up thread discussions, mine was from a 240v - 4.5 v dc wallwart phone charger, the original thought coming from Turtlehead, who was using them as a secondary winding after…"
Oct 23
Joseph J. Rogowski replied to Joseph J. Rogowski's discussion Simple Moving Coil Pickup
"I will help you draw your own picture. Draw a horizontal straight line about 6 inches long. Under each end draw an inverted “V” representing the nut and the bridge. Label the metal string behind the nut as #1 and the metal string part…"
Oct 23
Joseph J. Rogowski replied to Bryan Pieper's discussion Piezo disc transducer spec question
"High impedance transducers like piezo devices have a very high impedance and we’ll get loaded down by using volume controls in the 500K ohm to 1 Meg ohm range. This passive volume control is also in parallel with the input impedance of a…"
Oct 23
Paul Craig replied to Joseph J. Rogowski's discussion Simple Moving Coil Pickup
"I think we need some pics of this to help us wrap our heads around this idea Joseph. At least I do. Haha"
Oct 23
Joseph J. Rogowski replied to Bryan Pieper's discussion Piezo disc transducer spec question
"If you load the piezo with from 3 meg ohms to 10 meg ohms you will boost the lower end of the response. Piezo devices are capacitive driven and have a higher impedance to lower frequencies just the opposite of wire wound inductive guitar pickups.…"
Oct 23
Joseph J. Rogowski replied to Bryan Pieper's discussion Piezo disc transducer spec question
"Most piezo disks are high impedance and are affected by the typical capacitance in the connecting guitar cable of about 35 pf per foot. This cable capacitance acts like a treble roll off capacitor places across the piezo device. The key to getting…"
Oct 23
Joseph J. Rogowski posted a discussion

Simple Moving Coil Pickup

For all you guys making a wide variety of stringed instruments here is a new way to make a quick and simple pickup. All you need is a small, miniature audio transformer with 8 ohms on one side and from 15,000 to 20,000 ohms (or higher if you can find one) on the other side. These transformers are typically about .75" by .75" so one or more can easily fit in your instrument. Typically, you use one transformer per string.To estimate the step up ratio of the transformer do this simple math. An 8…See More
Oct 23
Moritz Voegeli left a comment for Joseph J. Rogowski
"Thanks Joseph for your answer, I'm preparing a thread with your posts, the beefiest part of the whole discussion and worth to save from oblivion. Have a good time, yours, Moritz"
Apr 21
Joseph J. Rogowski left a comment for Moritz Voegeli
"It was probably intended to say something like measured electrical output. That is the problem with an ipad tablet touch screen keyboard. Sorry for the confusion. Joseph J. Rogowski"
Apr 21
Moritz Voegeli left a comment for Joseph J. Rogowski
"Joseph hi, thanks for your quick response, but i think it's not your post I mentioned: here the full text with the strange place in bold:  The reason why I chose the CSE187L current transformer is because it has a metal frame around the…"
Apr 21
Joseph J. Rogowski left a comment for Moritz Voegeli
"If you want to know the total output impedance of your current transformer pickup without an LCR meter, just assume that the shorted primary of the CSE-187L current transformer is 80 Ohms, then just add the resistance of the added string loop wire…"
Apr 21
Moritz Voegeli left a comment for Joseph J. Rogowski
"Joseph hi, in one of your contributions to the «induction pickup» thread you typed to a note pad there is a place I don't understand: When using the CSE187L if you bent the primary wires inward to short the primary and silver…"
Apr 21
Joseph J. Rogowski updated their profile
Mar 18
Joseph J. Rogowski is now a member of Cigar Box Nation
Mar 3

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How did you learn about Cigar Box Nation?
Talk on the web
How many instruments have you built so far?
5
What do you find most interesting about cigar box guitars? (If you do not enter something meaningful here, your membership may be rejected).
Your creative use of pickup technology.

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At 2:40pm on April 21, 2017, Moritz Voegeli said…

Thanks Joseph for your answer, I'm preparing a thread with your posts, the beefiest part of the whole discussion and worth to save from oblivion. Have a good time, yours, Moritz

At 1:33pm on April 21, 2017, Moritz Voegeli said…

Joseph hi,

thanks for your quick response, but i think it's not your post I mentioned: here the full text with the strange place in bold: 

The reason why I chose the CSE187L current transformer is because it has a metal frame around the laminated core which is a convenient way to connect the ground of a two conductor shielded mic cable. Also connect the ground to one side of the thick wire string loop.

The string loop should be a very low resistance, usually measured in micro ohms to carry enough current to make a good output on the transformer output.

I chose the 500 turn current transformer because it produces an output closer to the range of a low impedance microphone, typically 150 ohms to about 300 ohms max. Most XLR mic inputs are about 2400 ohms actual input loading impedance to act as a bridging loan on the input source impedance of the mic or current transformer pickup.

When using the CSE187L if you bent the primary wires inward to short the primary and silver soldered this small loop together, you get an output moped an electrical on the current transformer of 80 ohms. All you need to do now is to look up the total resistance of the string loop wire. AWG 11 is 105 micro ohms per inch so a 6 inch string loop adds 630 micro ohms. Multiply 630 micro ohms by the turns ratio squared and get 157.5 ohms. Add this to the impedance of the transformer loop portion of the string loop and you get 237.5 ohms which is right near the upper limit to feed an XLR input. If you were to use a 1000 turn transformer you would have an output close to 1000 ohms and would be severely loaded down by the XLR input impedance.

At 9:09am on April 21, 2017, Moritz Voegeli said…

Joseph hi,

in one of your contributions to the «induction pickup» thread you typed to a note pad there is a place I don't understand:

When using the CSE187L if you bent the primary wires inward to short the primary and silver soldered this small loop together, you get an output moped an electrical on the current transformer of 80 ohms.

Wayfinder left cigarboxnation destroying the «induction pickup» thread we are trying to reconstruct.

Have a good time, Moritz

 
 
 

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