[jarnopp]

Like magicalmouse, i too got fed up of charging the battery and took it out. The first thing i noticed is that for a given volume level setting, the output level is now lower. It takes approx 6 clicks up to match the same output level as before. Other than that, i don't really detect a SQ difference.

Edit: In my (desktop) set up the Mojo is feeding a tube headphone amp thus not driving headphones directly.

There is always this option:
https://www.head-fi.org/threads/cho...n-3rd-post-◄★☆.784602/page-2581#post-14989857

 

[vlach]

There is always this option:
https://www.head-fi.org/threads/cho...n-3rd-post-◄★☆.784602/page-2581#post-14989857

8 hours playback on a 20 second charge? Sign me up.

Thank you.

 

[vlach]

Since my Mojo battery died i replaced internal battery with... one green same supercapacitor as in Hugo TT2. (as this woids warranty and total operation please do it on your own risk). Now Mojo has same power design as Hugo TT2. This is the cleanest and responsive possible power supply. As for capacity it last 7-9 seconds without power supply.
Now My mojo needs around 20seconds to charge so i can switch on and leaving plugged it operates at all output levels pretty well.
I have paired my mojo with Anker 10000mah. Now anker charges supercap and together they last 18h with one full charge.

I assume you mean it lasts 7-9 'hours' without power supply?

Also, where can i get the green same supercapacitor as in Hugo TT2?

Do you have any photos showing it installed inside the Mojo?

Thank you.

Edit: Is it something like this?

 

[miketlse]

I assume you mean it lasts 7-9 'hours' without power supply?

Also, where can i get the green same supercapacitor as in Hugo TT2?

Do you have any photos showing it installed inside the Mojo?

Thank you.

You are stepping on ground best dealt with by @Rob Watts
I think he posted that the half life of the supercapacitors was 10 or 20 years.

 

[vlach]

You are stepping on ground best dealt with by @Rob Watts
I think he posted that the half life of the supercapacitors was 10 or 20 years.

Sure, but if Vyyy posted this option here he might as well explain how it works.
Also, i can't imagine why Rob would be interested in providing assistance with modifying the design of one of his products, it just wouldn't make sense.

 

[Steve Wilcox]

An alternative is to use a simple timer socket, set to charge the Mojo when you're asleep and providing a fully charged battery when you need it.

 

[vlach]

An alternative is to use a simple timer socket, set to charge the Mojo when you're asleep and providing a fully charged battery when you need it.

The problem is that the battery sits directly on top of the processor chip that generates a lot of heat and deteriorates the battery.
Vyyy's solution is the best one i heard of yet...if he can only be more specific with instructions on how to make it work!

 

[jarnopp]

I assume you mean it lasts 7-9 'hours' without power supply?

Also, where can i get the green same supercapacitor as in Hugo TT2?

Do you have any photos showing it installed inside the Mojo?

Thank you.

Edit: Is it something like this?

I don’t have photos, but this is fa on a PM:

Manufacter and model is this : https://www.eaton.com/us/en-us/catalog/electronic-components/phv-supercapacitor.html

Part number from data sheet PHV-5R4V505-R, https://www.eaton.com/content/dam/e...percapacitors-cylindrical-pack-data-sheet.pdf

Becouse my battery died, i cut battery connection cable, and soldered to supercap (+ / - ) . Simple as that.

 

[magicalmouse]

I'm pretty sure that Rob Watts said awhile ago that it was possible to remove the battery successfuly although it may affect SQ with lack of dynamic punch at times - since i use sensitive headphones (relatively) meze 99 and hd25 this should not be a problem i would have thought and the music i listen to is vocal not usuallly subject to huge dynamic swings. I certainly am (so far) happy with the SQ.

 

[vlach]

I don’t have photos, but this is fa on a PM:

Manufacter and model is this : https://www.eaton.com/us/en-us/catalog/electronic-components/phv-supercapacitor.html

Part number from data sheet PHV-5R4V505-R, https://www.eaton.com/content/dam/e...percapacitors-cylindrical-pack-data-sheet.pdf

Becouse my battery died, i cut battery connection cable, and soldered to supercap (+ / - ) . Simple as that.

Very interesting, thank you so much!

Out of curiosity, did you secure the supercap somehow in order to prevent it from moving inside the Mojo?

 

[calbu]

I don’t have photos, but this is fa on a PM:

Manufacter and model is this : https://www.eaton.com/us/en-us/catalog/electronic-components/phv-supercapacitor.html

Part number from data sheet PHV-5R4V505-R, https://www.eaton.com/content/dam/e...percapacitors-cylindrical-pack-data-sheet.pdf

Becouse my battery died, i cut battery connection cable, and soldered to supercap (+ / - ) . Simple as that.

The battery charging voltage is 8.4V. How can a supercap rated for 5.4V be used?

 

[jarnopp]

Very interesting, thank you so much!

Out of curiosity, did you secure the supercap somehow in order to prevent it from moving inside the Mojo?

I haven’t done this myself, but if you solder it in, and of course only use as a stationary dac, then I don’t see a need for further securing.

 

[jarnopp]

The battery charging voltage is 8.4V. How can a supercap rated for 5.4V be used?

The usb is 5v, which works to feed an amplifier, but not necessarily for all (more demanding) headphones. The supercap helps with power demands that may be required for peaks or possibly harder to drive headphones. I haven’t done this myself, but I would see it as a poor man’s Qutest if I had a need for dac to feed an amp. But may also work well for items.

 

[Kentajalli]

The battery charging voltage is 8.4V. How can a supercap rated for 5.4V be used?

And I don't think it should be used, there are 9V supercaps available.
The charging voltage should be a switched mode (i.e. pulses) that average out about 8.4V - meaning at its peaks it hits even higher. but once connected to a battery or a supercap (pretty much a battery) the peaks gets dulled down - and the current flow would be low - however internally the capacitor starts to leak current and its life and performance gets reduced.
Frankly, from an electrical engineering point of view, I can not understand why a supercap should improve the sound in anyway!
I understand, if the battery is faulty and the owner does not want to fork out $100 - but as an upgrade , I doubt if it would be valid.

 

[Sound Eq]

greetings

i have mojo poly, and my mojo is bout 2 years old when i charge it fully while turned off it gives 4 hours playback

now when i connect it to the poly and both are fully charged, i noticed that after fully charging them and not even turning them on, after a day while not being used that poly battery is blue while mojo is orange, how can this big discharge happen so fast

any recommendations