solderdude
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measureutternutter
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Post by solderdude on Feb 11, 2018 10:43:11 GMT
Had the same problem.
In my case it turned out one of the batteries was faulty.
They are in series.
charge it and then switch the amp on.
After 10 mins of usage check the battery voltage of each battery and one will most likely be much lower in voltage.
500x rechargeable ... my @$$
The charging current is very low so it is impossible to over charge them.
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juke
very active
Posts: 396 
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Post by juke on Feb 13, 2018 16:06:50 GMT
Started to remove the battery clips to check the voltage as you advised Frans and I noticed one of the battery to PCB cables seemed a bit floppy. Turned out it was hanging by one strand, Re-soldered and has been playing a couple of hours now without problems.
Thanks for help!
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Post by luisdent on Feb 23, 2018 21:55:55 GMT
is there any chance someone would be willing to build me a kameleon with hd600 correction for a fee?
also I've seen varying measurements that sometimes show the hd600 has more thd in the low bass but others show the opposite... is the hd650 better with compensation?
I'm about to buy one or both headphones (used to own the hd600). i plan to compare and keep the one i like more...
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Post by fleezi on Feb 27, 2018 5:35:43 GMT
Hey guys, just wondering if there's a way to convert the Kameleon from the dual 9v batteries to permanent USB or wall power?
Not using it as a portable so it's a pain to have to recharge.
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solderdude
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measureutternutter
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Post by solderdude on Feb 27, 2018 6:02:32 GMT
The best way to do this is to use an external power supply +/- 12V to max +/-16V.
It would require another power connector which has 3 input pins.
A cheap way out but most likely less suited when driving low impedance and power hungry headphones is to change the charge circuit so the amp gets fed +/- 12V from the built in DCDC converter.
As that converter is just 1W the max output power would be limited to about 2 x 0.2W output power per channel.
Which is still more than most amps.
You can also just keep the 5V power supply permanently on.
The batteries can't be overcharged as the trickle current drops down to just 13mA.
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Rabbit
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Post by Rabbit on Feb 27, 2018 10:05:24 GMT
Do the batteries need to be in circuit for the 5V power supply Frans? Ie: can the batteries be removed and the amp left plugged in to work?
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solderdude
Administrator
measureutternutter
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Post by solderdude on Feb 27, 2018 21:37:42 GMT
It is designed to work with the batteries.
Without them and fed from 5V the amp does work with high impedance headphones but not so well with low impedance headphones.
The Batteries ensure a low impedance power supply.
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