I have decided to open separate modding thread to avoid the appreciation thread being cluttered.
There are few reasons why I wanted to mod the C&C.
- Learning new things is always good thing.
- I’ve read that the amp has problems with power section, it is underpowered.
- The soldering in my amp was very poor.
- Few of the components looked like burned / damaged (tantalum caps)
I could not get this from my head and the amp SQ started to deteriorate (it's all in my head ;))
Ok, lets cut the crap and get things done.
Some technical details (according to manufacturer):
- Maximum output power: 300mW +300 mW;
- Headphone adapter Impedance: 8-300ohm;
- THD + N: <0.001%; Long life time: about 80 hours;
- Pocket size, Size: 76 * 57 * 13mm (aluminum housing);
- Weight (including batteries): 100g;
- Charging Power Interface: 5V0.5A DC, Universal miniUSB interface.
- Signal noise ratio :110dB
Known parts list (no need for obvious parts like jacks or DTDP switches). And no, there are no red WIMA couplins caps ;)
- 3x 1000uF electrolityc capacitors 6.3V 8x11.5mm
- 2x 0.22uF (220nF) film caps
- 2x 0.15uF (150nF) film caps
- 2x 0.18uF (180nF) film caps
- 2x 0.12uF (120nF) film caps
- 2x 0.015uF (15nF) film caps (all film caps need to be 7.2x6.5x2.5mm or smaller)
- 4x 100uF tantalum caps (probably size A or B).
- 2x TPS60403 inverting charge pump outputting aproximately -/+4V and 169mA on battery and 250mA on USB power (confirmed by Tai/CieOS)
- 3.7V Lithium-Ion battery compatible with Nokia 5M (need to be confirmed)
- 10K A double taper logarithmic potentiometer with switch (made by Alpha)
Most of the IC's are sanded down but I was lucky enough to get the charge pumps deciphered. Maybe someone will be lucky with the rest of the parts.
So I've recapped half of the film caps, all electrolitycs, 3 out of four tantalum capacitors. Quite happy with results.
To do: change charge pumps for ones outputing more current (original ones have 60mA of output). I have couple of LM2662 and LM2663 - 200mA of current output.
I'm also thinking of changing the enclosure for a little bit bigger. Best size for me would be a 5mm higher one, which would give some extra space for caps and power section, but I can't find one anywhere. I think I will stick it into nice 2.5" hdd enclosure.