The electronics of the minuscule module is a 1S Li-ion/LiPo battery charger circuitry followed by an adjustable DC-DC boost regulator circuitry. The easiest way to get off the ground is to buy the very popular and utterly cheap version I bought from Banggood. Let’s find something more sensible!Īcross the web there are countless modules suitable for my o it yourself 9V battery idea. It’s simply because some other circuit/module is also required to boost the LiPo battery output (3.7V-4.2V) to 9V, and using two separate circuits/modules is possible (see the primal block diagram) but too impractical for a construct which must be small enough to fit inside a little enclosure.
You can try the omnipresent TP4056 Li-ion/LiPo battery charger module, but it is not advised here. In principle, the tiny circuit board secured by Kapton® tape will render decent protection against overcharge, deep discharge, overcurrent (charging and discharging), and accidental short circuit.Ībiding by commercial aspect next needy thing is a 1S LiPo battery charger circuit/module that can charge the battery from a USB standard 5VDC power supply. Most LiPo batteries are sold with integrated protection circuits. It’s worth noting that a lithium polymer battery is sensitive to both under and over voltage charging and can catch fire or explode if overheated or short circuited. Opt for a 1S (3.7V)/500mAh or 600mAh lithium-polymer (LiPo) battery (commonly used in remote controlled toys). Replacing the traditional 6F22 9V type with a stronger rechargeable 9V battery/batteries can hopefully clear up that mishap.Ĭoming to the surface, even the smallest lithium-ion battery pack won’t work for this because an ultra-thin battery pack is crucial for the proposed project. īelow you can see the battery room of a typical active bass guitar.Īs you’ve probably guessed, the common 6F22 9Vbattery is not a strong one, so naturally when it gets to die soon the guitarist on stage start to face serious issues in the sound. Most active basses have passive pickups with active circuits so that the electrical signal comes out of the passive pickup runs into a powered preamplifier. In some cases, two 9V batteries are used together in parallel to prolong the playtime, therefore special dual-9V battery holders/cartridges are also available.įirst, what’s active bass? The term active bass usually refers to the addition of a preamp powered by a battery. Let’s get started!Ĭompact 9V battery holders and 9V battery cartridges are very typical things found in every guitar store as those accessories are commonly used in active bass guitars and guitar pedals, etc.
It may not be the smartest way, but it works. The simplest way would be to make it with a small 1S (3.7V) lithium polymer (LiPo) battery and then use a minuscule dc-dc boost converter module set to 9VDC output. Since I’m starting to use more 9V rechargeable batteries, I thought it would be a good idea to build a simple 9V rechargeable battery for my friendly guitarist instead of having to urge him to look for and gather bunch of expensive 9V batteries day-to-day.
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