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Post by pablogilberto on Jun 11, 2020 7:57:25 GMT -5
Hello!
I have a guitar wiring project and I'd like to know if this is possible.
I have 1 single coil passive and 1 active piezo.
I use a 3 way switch to toggle between pickups and to engage them both (at mid position)
I'm wondering if it's possible to use the preamp circuitry of my active piezo in order to make the single coils active?
Is that possible or is that a good idea?
Let me know your thoughts.
Thank you!
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Post by ashcatlt on Jun 11, 2020 18:39:27 GMT -5
Yeah the preamp should work with the magnetic pickup just fine, but it’s not a good idea to try to mix the two types of pickups via “straight wire” or in this case a passive switch. What you actually want is a preamp or at least active buffer for each and then you mix the outputs of those via simple resistor/switch network.
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Post by pablogilberto on Jun 11, 2020 19:30:12 GMT -5
Yeah the preamp should work with the magnetic pickup just fine, but it’s not a good idea to try to mix the two types of pickups via “straight wire” or in this case a passive switch. What you actually want is a preamp or at least active buffer for each and then you mix the outputs of those via simple resistor/switch network.1. #1 Using the passive 3 way switch, here's my pickup combinations. Pos 1. Passive SC only Pos 2. Passive SC + Active Piezo Pos 3. Active Piezo only Are you saying that position 2 is not a good idea? Why? #2 "What you actually want is a preamp or at least active buffer for each and then you mix the outputs of those via simple resistor/switch network." - Do you have a sample diagram for this? Thank you! |
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Post by ashcatlt on Jun 11, 2020 19:51:54 GMT -5
Are you saying that position 2 is not a good idea? Why? Well because they generally load each other in ways that don't let either of them sound good. From the perspective of the magnetic pickup, it's an RLC lowpass filter and from that of the piezo it's a RLC highpass and...it just gets ugly... Well, no. Whatever you have for a preamp right now, get another one, connect each pickup to its own, and then you can try just connecting their outputs to the switch instead of the pickups, but if that causes volume drop or tone loss in the middle position, you'll put some resistors between the preamps and switches. JohnH has a couple things around if you want to build your own preamps instead. |
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Post by thetragichero on Jun 11, 2020 20:03:55 GMT -5
would something as simple as a buffer work?
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Post by pablogilberto on Jun 11, 2020 20:10:33 GMT -5
Are you saying that position 2 is not a good idea? Why? Well because they generally load each other in ways that don't let either of them sound good. From the perspective of the magnetic pickup, it's an RLC lowpass filter and from that of the piezo it's a RLC highpass and...it just gets ugly... Well, no. Whatever you have for a preamp right now, get another one, connect each pickup to its own, and then you can try just connecting their outputs to the switch instead of the pickups, but if that causes volume drop or tone loss in the middle position, you'll put some resistors between the preamps and switches. JohnH has a couple things around if you want to build your own preamps instead. Thanks for answering. I'm checking EB MM JP6 demo and I saw that it has a switch which lets you engage the passive pickups and active piezo at the same time (middle position of the switch at the top part of the guitar) How did they manage to do this? Isn't it the same thing that I was referring? Or am I missing something? I'd like to learn building a preamp for this, can you refer me to JohnH's link? Thank you! |
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Post by ashcatlt on Jun 11, 2020 20:16:00 GMT -5
If they're doing it correctly, then they're buffering each pickup and mixing the outputs of the active stages like I said. For JohnH's thing, the quickest I can find is start with this reply, read it, and then click the link. |
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Post by pablogilberto on Jun 11, 2020 20:21:37 GMT -5
If they're doing it correctly, then they're buffering each pickup and mixing the outputs of the active stages like I said. For JohnH's thing, the quickest I can find is start with this reply, read it, and then click the link. So you mean, this passive pickups won't work if there is no battery? Thanks for the link! |
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Post by ashcatlt on Jun 11, 2020 21:04:16 GMT -5
According to the schematic I found for the JP6, yes. There's just the one circuit board, but both the mag pickups and the piezo connect to/through it before going to the output jack. Unless they've got some super fancy circuit trickery that allows the mag pickups to bypass that circuit when it's not powered (I'd bet a lot of beers that's not case) it won't do much without a battery.
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Post by JohnH on Jun 12, 2020 1:06:35 GMT -5
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Post by pablogilberto on Jun 12, 2020 5:03:59 GMT -5
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