Fishman Universal Rechargeable Battery Pack

ABtheBassPlayer · Post by **ABtheBassPlayer** » 12 Aug 2023, 18:46

Greetings! Been looking for pictures of this thing with no luck. Was wondering if anyone would mind taking pictures of one of these? Thank you!

Jarno · Post by **Jarno** » 12 Aug 2023, 21:10

Ben Crowe from Crimson Guitars posted a video on youtube where he takes a apart a Fender Acoustasonic, which has Fishman Electronics and the batterypack.

ABtheBassPlayer · Post by **ABtheBassPlayer** » 13 Aug 2023, 03:13

Jarno wrote: ↑12 Aug 2023, 21:10 Ben Crowe from Crimson Guitars posted a video on youtube where he takes a apart a Fender Acoustasonic, which has Fishman Electronics and the batterypack.

Thanks for the video! I checked it out but wasn’t able to get a good look at the PCB…

I’m hoping someone here has one and wouldn’t mind sharing some pictures of the front and back. I found a picture here: https://khronscave.blogspot.com/2019/09 ... h.html?m=1, but, unfortunately, is not head on and there’s no pictures of the back.

Thanks!

Voffkins · Post by **Voffkins** » 29 Dec 2023, 14:36

https://tinypic.host/image/IMG-2704.Qlt0d

https://tinypic.host/image/IMG-2708.QlLvv

mauman · Post by **mauman** » 29 Dec 2023, 15:34

Here are the previous two images, to prevent future broken links, in case someone wants to trace.

: Fishman UBP 2.3 side 1

: Fishman UBP 2.3 side 2

ABtheBassPlayer · Post by **ABtheBassPlayer** » 06 Sep 2024, 23:55

Hey! It’s been a while. Just wanted to let you all know that I was able to trace it and am working on a PCB. I am however missing a resistor value.

I’m reaching out to @Voffkins for help, however, if anybody has a unit, would you mind measuring that resistor for me? It’s R11 on the back. Thanks!

I’ll keep you all posted.

Voffkins · Post by **Voffkins** » 07 Sep 2024, 05:48

ABtheBassPlayer wrote: ↑06 Sep 2024, 23:55 Hey! It’s been a while. Just wanted to let you all know that I was able to trace it and am working on a PCB. I am however missing a resistor value.

I’m reaching out to @Voffkins for help, however, if anybody has a unit, would you mind measuring that resistor for me? It’s R11 on the back. Thanks!

I’ll keep you all posted.

I'm sorry but right now I don't have this bass, I'm a luthier and I had this instrument to adjust, when a client brings it to me again I'll look at it

Jarno · Post by **Jarno** » 09 Sep 2024, 12:20

I think it is risky to just go by a trace, unless this is just a way of understanding what is going on. Don't assume you can just roll a PCB and expect it to work. This is a rechargeable battery, and as such it needs charging circuitry as specified by the battery supplier.
If there is some on/off circuitry, it is probably also better to design that around the functionality you want.

These batteries can go "Bang!" and cause a fire, proceed with caution.

ABtheBassPlayer · Post by **ABtheBassPlayer** » 24 Sep 2024, 21:09

Jarno wrote: ↑09 Sep 2024, 12:20 I think it is risky to just go by a trace, unless this is just a way of understanding what is going on. Don't assume you can just roll a PCB and expect it to work. This is a rechargeable battery, and as such it needs charging circuitry as specified by the battery supplier.
If there is some on/off circuitry, it is probably also better to design that around the functionality you want.

These batteries can go "Bang!" and cause a fire, proceed with caution.

No worries! I've been reading a lot into lithium batteries and battery charging. I've been working on this for quite a while now and am confident in my trace. I also used the datasheets to confirm my trace.

I finished my PCB and have it on order.

Since I'm using a different charger, I had to add a few extra bits.

Jarno · Post by **Jarno** » 26 Sep 2024, 08:55

Very cool!

Did look at these, can you share a schematic of how you did this (would love a 18V variant, as that is what I typically use for onboard electronics (on electric basses))?

plush · Post by **plush** » 29 Sep 2024, 14:22

Jarno wrote: ↑26 Sep 2024, 08:55 Very cool!

Did look at these, can you share a schematic of how you did this (would love a 18V variant, as that is what I typically use for onboard electronics (on electric basses))?

You can use mine as an example.

It's a replacement for a fender acoustasonic charger/boost module which i've designed and built from scratch.

ABtheBassPlayer · Post by **ABtheBassPlayer** » 30 Sep 2024, 21:32

Jarno wrote: ↑26 Sep 2024, 08:55 Very cool!

Did look at these, can you share a schematic of how you did this (would love a 18V variant, as that is what I typically use for onboard electronics (on electric basses))?

I’ll post the schematic after I verify it.

Just like in @plush’s schematic, you have to change the feedback resistors in order to set the output voltage.

R1 is 1.43M Ohm
R2 would then be 105k Ohm

ABtheBassPlayer · Post by **ABtheBassPlayer** » 06 Oct 2024, 01:10

Quick update, PCBs and parts are still in transit. I hope it’ll just be another week or so… Waiting impatiently

Jarno · Post by **Jarno** » 09 Oct 2024, 15:25

Very very cool!

ABtheBassPlayer · Post by **ABtheBassPlayer** » 12 Oct 2024, 18:26

Hey! Parts came in this morning. The PCBs will be here on Tuesday.

: IMG_0664.jpeg (100.71 KiB) Viewed 2756 times

ABtheBassPlayer · Post by **ABtheBassPlayer** » 19 Oct 2024, 21:42

Greetings! I was able to put some together. Here they are, cleaned up and tested. Everything came out okay.

: IMG_0673.jpeg (78.62 KiB) Viewed 2203 times

Jarno · Post by **Jarno** » 21 Oct 2024, 12:12

Looks great, hopefully nothing explodes

In any case do keep safety in mind!

ABtheBassPlayer · Post by **ABtheBassPlayer** » 21 Oct 2024, 21:34

Greetings!

Here is the schematic as promised. Please note, instead of the MAX8895X, I opted to use the popular TP4056 and incorporated load sharing. Please see attached.

BatteryChager.pdf: (48.97 KiB) Downloaded 64 times