ToneRite Spectrum And Physical Analysis
Dec 19, 2018 18:56:33 GMT -5
Stud Muffin, ancient1, and 1 more like this
Post by CTGull on Dec 19, 2018 18:56:33 GMT -5
I downloaded a spectrum analyser app for my phone. Yeah, how accurate can that be??!!
Accurate enough.
First I checked the output vs. the control knob position. As I heard earlier, there is no difference in output between 0 and about 60-65%.
Then there is a gentil rise in intensity until it maxes out at about 80%.
I took screen captures with the ToneRite on my OM-21 and on my desk.
OM-21 with ToneRite on the lowest setting.
OM-21 with the ToneRite on the highest setting.
Oddly, while on my OM-21 at about 60% there were additional half wave harmonics added, probably having something to do the the resonant frequency of the guitar.
ToneRite on my desk on the lowest setting.
ToneRite on my desk on the highest setting.
The abnormality at about 60% did not happen on my desk. It has to be related to the guitar.
The ToneRite is more than likely a transformer, vibrating at the 60Hz alternating current frequency, the output controlled by a small inline box with a potentiometer (variable resistor). The is a strong second harmonic at 120Hz, which is actually slightly louder with the ToneRite on the OM-21. Then the other harmonics diminish in intensity as the harmonic order increases.
But, inside the little control box, there is more than just a potentiometer (variable resistor). There is a small circuit board populated with a transistor, a couple of capacitors, diode and a few small resistors. That exceeds my limited electronic knowledge. It's very possible they are amplifying those strong harmonics, which more than likely would fade away quickly with just a standard transformer. I'm sure an electrical engineer would know more about the subject.
View of the internal circuit board.
View of the side of the circuit board, showing the transistor, diode and resistors.
View of the internal capacitors.
Possibly the most important non-electrical feature are the molded rubber (assumed) feet that attach the device to the guitar. The feet aren't solid, the whole piece is actually about 1/16" thick, formed from a sheet of rubber. This allows them to flex and conform to the string spacing. It barely fits on the 2.19" spacing of my OM-21.
Side view of the feet.
Bottom view upside right. The narrow part of the feet rest against the bridge.
Bottom view upside down.
And the most important view, the end view that shows how it attached to the strings.
At some point I will make a 3D model of the ToneRite, including the rubber feet, to figure out the string spacing limitations.
Accurate enough.
First I checked the output vs. the control knob position. As I heard earlier, there is no difference in output between 0 and about 60-65%.
Then there is a gentil rise in intensity until it maxes out at about 80%.
I took screen captures with the ToneRite on my OM-21 and on my desk.
OM-21 with ToneRite on the lowest setting.
OM-21 with the ToneRite on the highest setting.
Oddly, while on my OM-21 at about 60% there were additional half wave harmonics added, probably having something to do the the resonant frequency of the guitar.
ToneRite on my desk on the lowest setting.
ToneRite on my desk on the highest setting.
The abnormality at about 60% did not happen on my desk. It has to be related to the guitar.
The ToneRite is more than likely a transformer, vibrating at the 60Hz alternating current frequency, the output controlled by a small inline box with a potentiometer (variable resistor). The is a strong second harmonic at 120Hz, which is actually slightly louder with the ToneRite on the OM-21. Then the other harmonics diminish in intensity as the harmonic order increases.
But, inside the little control box, there is more than just a potentiometer (variable resistor). There is a small circuit board populated with a transistor, a couple of capacitors, diode and a few small resistors. That exceeds my limited electronic knowledge. It's very possible they are amplifying those strong harmonics, which more than likely would fade away quickly with just a standard transformer. I'm sure an electrical engineer would know more about the subject.
View of the internal circuit board.
View of the side of the circuit board, showing the transistor, diode and resistors.
View of the internal capacitors.
Possibly the most important non-electrical feature are the molded rubber (assumed) feet that attach the device to the guitar. The feet aren't solid, the whole piece is actually about 1/16" thick, formed from a sheet of rubber. This allows them to flex and conform to the string spacing. It barely fits on the 2.19" spacing of my OM-21.
Side view of the feet.
Bottom view upside right. The narrow part of the feet rest against the bridge.
Bottom view upside down.
And the most important view, the end view that shows how it attached to the strings.
At some point I will make a 3D model of the ToneRite, including the rubber feet, to figure out the string spacing limitations.
