Re: JamMix - Headphones Practice-Play-Along Amp
Posted by MAO on
URL: http://guitar-fx-layouts.238.s1.nabble.com/JamMix-Headphones-Practice-Play-Along-Amp-tp26681p29028.html
I ended up changing this circuit quite a bit, actually I think the only section I've retained from the original design is the pan pot. It's really no longer the JamMix, but the same idea...a headphone amp to play along with the output from a phone/ipod/tablet etc.
I stripped down the Audio input part of the circuit and now I can't tell the difference between the headphone jack from my ipod/Galaxy5/Kindle compared to the headphone output from the JamMix. The original JamMix circuit seemed to dull the audio a bit. This is the circuit I used for the audio input. (Although I never got the noise cancelling effect working all that well, the audio sounded pure, so I used the same audio input design for this version of the JamMix)
I also removed the original JamMix distortion circuit. It was ok, but I lost interest fairly quickly.
I built a temporary tester version which has 18v, +9v and -9v outputs. This allows for easy testing of a bunch of overdrive/distortion circuits with various power requirements.
The idea was to find a smaller distortion footprint that sounded good both clean and distorted through headphones. Then rotate the modified jammix sideways and place both boards into a single enclosure wired together...And then eventually draw up a new combined board.
Most of the smaller overdrive/distortion designs I've tried so far sounded a bit harsh through the headphones, or wouldn't go clean enough. (Lovepedal)
The madbean MOAR is the winner at the moment. To keep the controls down to 3, I hard wired the asymmetrical clipping, omitted the symmetrical diodes and clip switch, and preset the tone control with 39k and 11k resistors in place of the tone pot.
The MOAR layout is a bit larger than I would have liked, so the search for a smaller footprint is still on. But I've been playing this combination for a few days now, and still like it. If I haven't found something smaller/better, I'll post a combined layout for the MOAR and stripped down JamMix.
Here is the tester pcb if someone else wants to join in the search. The output from an external pedal goes to the "effect in" on the tester pcb.
URL: http://guitar-fx-layouts.238.s1.nabble.com/JamMix-Headphones-Practice-Play-Along-Amp-tp26681p29028.html
I ended up changing this circuit quite a bit, actually I think the only section I've retained from the original design is the pan pot. It's really no longer the JamMix, but the same idea...a headphone amp to play along with the output from a phone/ipod/tablet etc.
I stripped down the Audio input part of the circuit and now I can't tell the difference between the headphone jack from my ipod/Galaxy5/Kindle compared to the headphone output from the JamMix. The original JamMix circuit seemed to dull the audio a bit. This is the circuit I used for the audio input. (Although I never got the noise cancelling effect working all that well, the audio sounded pure, so I used the same audio input design for this version of the JamMix)
I also removed the original JamMix distortion circuit. It was ok, but I lost interest fairly quickly.
I built a temporary tester version which has 18v, +9v and -9v outputs. This allows for easy testing of a bunch of overdrive/distortion circuits with various power requirements.
The idea was to find a smaller distortion footprint that sounded good both clean and distorted through headphones. Then rotate the modified jammix sideways and place both boards into a single enclosure wired together...And then eventually draw up a new combined board.
Most of the smaller overdrive/distortion designs I've tried so far sounded a bit harsh through the headphones, or wouldn't go clean enough. (Lovepedal)
The madbean MOAR is the winner at the moment. To keep the controls down to 3, I hard wired the asymmetrical clipping, omitted the symmetrical diodes and clip switch, and preset the tone control with 39k and 11k resistors in place of the tone pot.
The MOAR layout is a bit larger than I would have liked, so the search for a smaller footprint is still on. But I've been playing this combination for a few days now, and still like it. If I haven't found something smaller/better, I'll post a combined layout for the MOAR and stripped down JamMix.
Here is the tester pcb if someone else wants to join in the search. The output from an external pedal goes to the "effect in" on the tester pcb.
1978 Gibson Les Paul Standard, Cherry Sunburst
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