Eternal guitar sustain with magnetic feedback circuit (Esus?)

Eternal guitar sustain with magnetic feedback circuit, something like the Ebow or Sustainiac devices. I am thinking of building this as a synth module or an electric guitar pedal, or both.
ESP Headphone Amplifier P113 link: sound-au.com/project113.htm
LM13600 datasheet: www.ti.com/lit/gpn/lm13700
Thanks for watching.

[@unrelatedactivities]

Guitar sustain with magnetic feedback circuit, something like the Ebow or Sustainiac devices. I am thinking of building this as a synth module or an electric guitar pedal, or both.
AGC Automatic Gain Control Amplifier from LM13600 Datasheet: th-cam.com/video/eazBp0zXL5Q/w-d-xo.html
ESP Headphone Amplifier P113 link: sound-au.com/project113.htm
LM13600 datasheet: www.ti.com/lit/gpn/lm13700
Thanks for watching.

[@unrelatedactivities]

AGC Automatic Gain Control Amplifier from LM13600 Datasheet: th-cam.com/video/eazBp0zXL5Q/w-d-xo.html

[@leiferickson3183]

Awesome! I've been wanting to built one of these into a guitar for years and have wondered why I never saw anyone using an AGC in their circuit, I am surprised that the coil was getting hot. Do you know how much power this was consuming? I wonder how fast it will go through batteries...

[@unrelatedactivities]

Thank you! I did not measure the current consumption, but the amplifier is rated around 1.5W into an eight ohm load with +-15V and probably is not a good option for battery power. The Sustainiac circuits use a class D amplifier, which seems to be much more efficient for battery usage (I think it runs on a 9V single supply). Here is one patent for their system: patents.google.com/patent/US5932827A/en

[@mariannwatt2678]

Is this like the EBow idea of years ago ?

[@unrelatedactivities]

Yes, it is a guitar sustain with magnetic feedback circuit, something like the Ebow or Sustainiac devices. I am thinking of building this as a synth module or an electric guitar pedal, or both.
AGC Automatic Gain Control Amplifier from LM13600 Datasheet: th-cam.com/video/eazBp0zXL5Q/w-d-xo.html
ESP Headphone Amplifier P113 link: sound-au.com/project113.htm
LM13600 datasheet: www.ti.com/lit/gpn/lm13700
Thanks for watching.