Alright... so maybe this is a bit fast, but I've been listening to some albums that I know I know without the supercapacitor and, right away... (controversy incoming) there is a noticeable difference between dynamics in the instruments, (sounds flat) the clarity is there but it feels like you just have moved from being fully wrapped in the music to listening from further away and instruments are not as "dynamic".
Now, this might be true given that using a constant energy source capped to a certain voltage and amps might reduce the dynamism of the signal but I'm possibly talking gibberish there so take that last comment with a grain of salt. I'm just a software developer who loves music and likes to thinker around man haha
Actually that was expected.
Once I said
we are not clever enough to re-engineer this device.
I said that, because Mojo was designed from ground up, by an expert engineering team, so every section interacts with other parts perfectly.
It was designed as a mobile device (Mo in Mojo), on a budget! so things it does not need, it does not have.
A mobile device works on Batteries, so it does not require a traditional power supply section, so it does not have it! (Galvanic Isolation is another, it does not have it)
All it requires is a charging circuit for the batteries, no more no less.
The internal battery is rated at 7.4V , it needs around 8.2V to charge up, so the charger should be good for about 9 or 10V.
Six years ago, when it was launched, it was decided that it should use standard USB power for charging - but USB only provides 5V !
So inside the device there is a DC to DC voltage doubler, basically it upscales the available 5V to about 10V. It does this in a switch-mode fashion. Active circuitry, creates pulses of voltage at double the USB voltage ( you hear this fast switching as a fizz when it is charging). these pulses carry a lot of electrical noise, but when connected to a large capacitor or a battery, the noise gets absorbed by the battery or the capacitor, creating an average steady DC voltage, to charge the batteries.
The charging circuit has voltage & current controls with thermal monitoring. Charging LiPo's is a delicate balancing act.
The charging circuit inside Mojo fits the bill, it is horses for courses, no more no less.
Now if one disconnects the battery, and try to use the charging circuit as a powersupply, it will not do!
OK it evidently operates, but that noise gets everywhere, furthermore, a battery or a large capacitor has very low internal impedance, ability to provide big current when needed - a charging circuit is far from it.
In this case, the super capacitors (very large capacity capacitor but small in dimension), absorb the pulses and provide low impedance power for Mojo, but batteries are better!
If one could get an outboard battery pack of 7.4V, connect it directly to the battery terminals, that would do.
If such a battery should have fast charging, so much the better.
I remember in the old days, there were head amps for low output moving-coil cartridges, that ran on batteries as no powersupply was clean enough.
If one needs to use Mojo as a desktop all the time, the best scenario would be, removing the batteries, replacing them with super capacitors, use a very clean outboard 7.5V powersupply , connected inside Mojo directly to the super capacitors.
Avoiding the charging circuit should be goal, as even using external batteries connected to Mojo through the USB port (and the charging circuit) would still be a noisy operation.
