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CDROM control KITs VFD version

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#247
My kit was waiting for me at work when I returned yesterday. Cheers for the quick delivery.

I've wired it up to an old MITSUMI drive from 2000. It works well but haven't had chance to give it a full listening test yet.


Has anyone used it with a DAC yet, if so can you simply connect it via a diy cable from the digital out or do you have to do anything else.

Cheers
 
#248
ramdog12345 said:
Has anyone used it with a DAC yet, if so can you simply connect it via a diy cable from the digital out or do you have to do anything else.
Click to expand...

No you can´t. the digital out on your drive is TTL level. You need a converter, which is shown here: http://www.diyaudio.com/forums/showthread.php?postid=1664537#post1664537

My drive sounded rubbish on the analogue out, so I have to use a dac and will build this small converter.

Good luck.

Regards,
Mischa
 
#250
markenvy said:
Hi slowgay,
thanks for correction.
I'm trying to put just one transformer, do you think I can use 12 vac for 5v line?
Click to expand...


Hi Markenvy

Yes,It can use 12V fo DC5V out.But in high-current output,the differential pressure Control in 6V, otherwise,it will cause LT1084 fever.Output Protection may be happened (such as a sudden drop in voltage is very low, this time, please reduce the input voltage )

Regards,
Huang
 
#251
slowgay said:
Hi all

The DC Power DIY kit 's some electronic component are changed

Resistance-----------------200ohm-1/4W------------------1pcs
Capacitance----NIPPON(OR-Panasonic)-4700uF/35V----------1pcs
-----------------------------ELNA-1000uF/35V------------1pcs
-------------samwha(OR-ELNA)-100uF/363V-----------------2pcs
----------------------Philips-CBB-0.1uF/100V------------7pcs
Variable resistor--------3296-10K-----------------------1pcs
Rectifier diode----------FR307-3A-----------------------4pcs
Radiator------------------Black-------------------------1pcs
Fixed screw--------------¦µ3x6mm------------------------1pcs
Insulation gasket----------------------¦µ3--------------1cps
Thermal insulation gasket-------------------------------1pcs
Voltage IC----------------------LT1084------------------1pcs
PCB----------------------Blue--11.16£ø4.2cm-------------1cps

Finished board may add 4USD more.

Thanks
Huang
Click to expand...


Hi Huang,

Can you post the circuit diagram? or show the back side of the board? I want to see if some inductors can be added for some filtering?. Also can you get a hold of some 10uH inductors?
 
#252
glt said:



Hi Huang,

Can you post the circuit diagram? or show the back side of the board? I want to see if some inductors can be added for some filtering?. Also can you get a hold of some 10uH inductors?
Click to expand...


Hi glt

Here it is.The ELNA-1000uF/35V is out of stock,So I get another instead.
Of course I can get some inductors what you want.

Regards
Huang

😀
 

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#253
Gabba said:
What is everyone using for power supplies? - a computer power supply really isn't ideal due to the fan and possible electronic noise affecting circuitry. Anyone made a dedicated one rather than a walwart or anything?
Click to expand...


Gabba, for such low power requirements, an AT or ATX power supply may work with fan disconnected. Try this... checking temperatures of the internal heat-sink.

An over-temperature, NTC controlled fan is the best solution for noise and safety, IMMO.

Electronic noise is not a problem (you could also add some filters/regulators)

@slowgay:
kit received in january the 3th.... thanks...
no time yet to test it.
:bawling:
 
#254
acid_k2 said:



Gabba, for such low power requirements, an AT or ATX power supply may work with fan disconnected. Try this... checking temperatures of the internal heat-sink.

An over-temperature, NTC controlled fan is the best solution for noise and safety, IMMO.

Electronic noise is not a problem (you could also add some filters/regulators)

@slowgay:
kit received in january the 3th.... thanks...
no time yet to test it.
:bawling:
Click to expand...


Hi acid_k2

Thanks for telling me that you received the kit~Holp you like it~
Yeah,I use ATX power supply with fan disconnected before to tesk the CDROM control kit. It's OK too.Just a little big.So I used the 2DC prower kit and one transformer(0-6V-12V/25W) for the CDROM now.It work good too.

Regards
Huang
 
#255
#256
glt said:
Huang,

Here are some ideas to improve your PS kit:

According to the datasheet, http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1040,C1055,P1282,D3741 C7, the adjust bypass capacitor is too small. In page 12 of the datasheet, it uses 25 uF for improved ripple rejection. The datasheet shows 150 uF for C10. I think The original .1 uF capacitor can also be used in parallel for further bypass.
Click to expand...


Hi glt

Thanks for your helping~You mean it will improve the kit if I change the C7/c12 to 1uf/150?OK..I will get to try it~^_^.Thanks.

Regards
Huang
 
#257
C7 change from .1 uF to 25 uF, C10 change to higher value (just following the datasheet)

Actually, C9 and C10 can be both changed to say 220uF which is a common value

If you can find all Panasonic FM capacitors, those are pretty good with low ESR and widely used by the cost-conscious DIYer. Another appealing (to DIYers) mod is to use ultra fast/soft recovery diodes.
 
#258
glt said:
C7 change from .1 uF to 25 uF, C10 change to higher value (just following the datasheet)

Actually, C9 and C10 can be both changed to say 220uF which is a common value

If you can find all Panasonic FM capacitors, those are pretty good with low ESR and widely used by the cost-conscious DIYer. Another appealing (to DIYers) mod is to use ultra fast/soft recovery diodes.
Click to expand...


Hi glt

Thanks for you suggestiong.Sorry for I can't find panasonic FM capacitors.It is very shortage in China.I only can find some ELNA or NICHICON FG/KZ.Is the picture correct now?

Regards
Huang
 

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#260
glt said:
ELNA or NICHICON FG/KZ are fine too. I just thought Panasonic FM would be available because they are plentiful here in US.

C7 is 25 uF according to the data sheet
Click to expand...


Hi glt

What kind of the 25uF capacitance to instead C7?Just like one of the C8-C11?Or use the non-polarized electrolytic capacitor?Is the picture correct now?Thanks

Regards,
Huang
 

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