Re: Headphone amp / mixer
Posted by MAO on Dec 06, 2018; 9:46pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/Headphone-amp-mixer-tp44796p44985.html
So in this version, I replaced the Timmy with a modified runoffgroove Condor Cab Sim, pretty much left the rest of the design as is, meaning the audio input, the guitar panning and headphone output.
The Condor mods are based on some comments I found on DIY or FSB I think.
I changed the input jfet stage of the Condor to a buffer as I could not get a completely clean tone using humbuckers with the original design, and also converted the U1A stage to a gain stage along with a pair of clipping diodes. I also went with the "Marshall" voicing as it sounded better with my gear and headphones.
This JamMan version takes pedals well, and I still like the ability to pan the guitar left or right when playing along with the audio input. The audio is crystal clear and sounds as good as the source.
It can also be used as a standalone pedal, although limited as there is no external tone control. But I can get 100% clean tones or a good bit of soft clipping with the gain control turned up. Which is useful when I just want to play for a few minutes and not so worried about the tone/distortion. But it certainly sounds better when placed after another pedal.
If considering building this, I would suggest reading the Condor build info for additional tweaks.
Also, use a switched jack for the audio input so the jack is grounded when nothing is plugged in.
The controls are straight forward:
Volume - Adjusts the guitar signal's output volume
Balance - Pans the guitar signal left, right, center or anywhere in between
Gain - Adds in the internal gain/clipping circuit, be careful with the volume control when cranking up the gain. (I turn the gain all the way down when using the JamMan with other dirt pedals)
Inputs
Audio In - Stereo jack - plug in a stereo cable from the line out or headphone out jack of a phone, computer, tablet etc. (Be sure the audio device volume is turned down to start)
In - Guitar straight in or from an external effect out jack.
Output
Headphones - Stereo jack
The audio volume is controlled by the audio device itself...be careful it can get extremely loud!
As for the opamps, I would stick with the 5532, but the TL072s can be any dual opamp of choice. A 1044 for the charge pump would be ok too.
URL: http://guitar-fx-layouts.238.s1.nabble.com/Headphone-amp-mixer-tp44796p44985.html
So in this version, I replaced the Timmy with a modified runoffgroove Condor Cab Sim, pretty much left the rest of the design as is, meaning the audio input, the guitar panning and headphone output.
The Condor mods are based on some comments I found on DIY or FSB I think.
I changed the input jfet stage of the Condor to a buffer as I could not get a completely clean tone using humbuckers with the original design, and also converted the U1A stage to a gain stage along with a pair of clipping diodes. I also went with the "Marshall" voicing as it sounded better with my gear and headphones.
This JamMan version takes pedals well, and I still like the ability to pan the guitar left or right when playing along with the audio input. The audio is crystal clear and sounds as good as the source.
It can also be used as a standalone pedal, although limited as there is no external tone control. But I can get 100% clean tones or a good bit of soft clipping with the gain control turned up. Which is useful when I just want to play for a few minutes and not so worried about the tone/distortion. But it certainly sounds better when placed after another pedal.
If considering building this, I would suggest reading the Condor build info for additional tweaks.
Also, use a switched jack for the audio input so the jack is grounded when nothing is plugged in.
The controls are straight forward:
Volume - Adjusts the guitar signal's output volume
Balance - Pans the guitar signal left, right, center or anywhere in between
Gain - Adds in the internal gain/clipping circuit, be careful with the volume control when cranking up the gain. (I turn the gain all the way down when using the JamMan with other dirt pedals)
Inputs
Audio In - Stereo jack - plug in a stereo cable from the line out or headphone out jack of a phone, computer, tablet etc. (Be sure the audio device volume is turned down to start)
In - Guitar straight in or from an external effect out jack.
Output
Headphones - Stereo jack
The audio volume is controlled by the audio device itself...be careful it can get extremely loud!
As for the opamps, I would stick with the 5532, but the TL072s can be any dual opamp of choice. A 1044 for the charge pump would be ok too.
1978 Gibson Les Paul Standard, Cherry Sunburst
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