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About SierraLima

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  1. Hey Guys, So I sorted out the problem. Lack of grounding for the signal of the inactive pickup. I'm using a DS2Y-S-DC5V DPDT relay for switching pickup signal. Before I was using just half of it and as a SPDT connecting the active pickup's signal to the final signal. The inactive pickup's signal was just an open circuit and not connected to anything. I'm now using the full double pole of the DPDT relay and the inactive pickup's signal is shorted straight to ground/shield. Works now.
  2. Hey Gents, So I've been working on a project for about a month where you can switch between neck and bridge pickups via either a footswitch on a pedal or via MIDI messages from an effects processor as opposed to a standard pickup selector switch on the guitar. The idea is eventually I'd rewire the guitar with a stereo jack with 3 conductors: neck pickup signal, bridge pickup signal and ground/shield. This would be sent via a 1/4" TRS stereo cable.. See below if you want more details: Anyhow I've got the entire Teensy Arduino programmed and the pedal running successfully on a breadboard. That's at least as far as my multimeter and connectivity tester is concerned. In real life I'm having a problem where the signal from the neck pickup is coming out (not at full blast but is quite audible) on the bridge pickup conductor and vice versa. I'm using this 15 foot stereo cable off of Amazon: https://www.amazon.com/CableCreation-6-35mm-Balanced-Stereo-Meters/dp/B01JY2CV1U Is it possible that the somewhat long cable is acting as an antenna where say the neck pickup signal conductor is transmitting magnetically and the bridge pickup conductor is receiving it? That's my suspicion which I think is theoretically true but I didn't expect the problem to be anywhere near this pronounced. If so any thoughts on how to eliminate this or at least minimize it to an inaudible level? Is this just an artifact of using a cheap cable with perhaps inadequate shielding? Thanks, Omri
  3. curtisa, I have one more question regarding your TLP222 suggestion. Can I just forget about using relays altogether and just use 3 of these photomosfets? (1 to short to ground as the kill switch circuit as you suggested, 1 to close the circuit for the bridge pickup, 1 to close the circuit for the neck pickup). Would using these to carry the signal from the pickups be noisy or introduce any other problems? One thing I really like about these as opposed to the relays is that according to the spec they only need 10 mA of forward current which is less than the 20 mA I can pull off of a Teensy 2.0 digital output pin. The relays need more current than the digital output pins can deliver and thus require me to introduce transistors and diodes as a relay driver circuit and simplicity and less components is good! Thanks Again!
  4. Thanks curtisa! Definitely good things to know that I wasn't aware of.
  5. Hey Guys, So I've had an idea for a while for a project to modify my Jackson SL7Q Soloist. The main idea would be to switch pickups via a custom Arduino powered foot pedal that can either be triggered manually by my foot or switched via a MIDI message every time I change preset on my POD HD Pro X via it's footswitch (or any other MIDI out capable effects processor). No more fiddling with the pickup selector or having to change both the pickup selector and using the foot switch to change effects processor preset simultaneously to get the tone I want. In addition, this pedal would have an on/off mute function. My guitar has 2 humbuckers with a 5 way pickup selector, volume knob and tone knob. The reality is I only ever use 2 pick up selector positions: full neck humbucker and full bridge humbucker, I never use a mix of the pickups or the pickups as single coils. I also only use the tone knob on full treble and I only use the volume knob on full volume or off to just mute it. As part of this, I would remove all the electronics (pickup selector, volume knob and tone knob) with the obvious exception of the pickups. I'd still need a jack for the cable, but I'd replace the stock mono 1/4" with a 1/4" TRS jack (1 conductor each for ground, neck pickup, bridge pickup). I'm not terribly worried about anything that goes into the pedal itself, I've done several non guitar Arduino projects successfully and I'm reasonably handy with electronics, soldering and writing software. This will by my first guitar mod project though, so I figured I should double check some assumptions I'm making before I mutilate my guitar in a way I'll regret due to ignorance, so here goes: 1) A tone knob is just a low pass filter based on a potentiometer and a capacitor? If it's on full treble, it's just a bypass? So I could completely remove it from the circuit and get the same tone as a tone knob stuck on full treble? 2) The volume knob is just a potentiometer and with it set at full volume it has 0 resistance? And hence, again I can just remove the volume knob from the circuit> 3) Are all input jacks basically the same size wise? Would something like https://guitarpedalparts.com/collections/1-4-jacks/products/1-4-switchcraft-stereo-trs-jack?variant=31256480710791 work? I attached a picture of my current stock jack. 4) I'm thinking of using 1 of these signal relays (https://guitarpedalparts.com/products/5v-dpdt-latching-relay?_pos=1&_sid=0cb05e3f2&_ss=r) to switch between the pickups and 1 to simply mute the guitar by opening and closing the circuit on the ground conductor from the 1/4" stereo TRS cable. Anything stand out as wrong with this approach? 5) Any other potential problems or anything else that might alter the tone of my guitar that I should be thinking about? Thanks, Omri
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