Help me

[guidobullo]

I purchased on Amazon .com the card of which I attach the images.
what I am interested in knowing is the type of component that I have to insert in the card and that I have circled in black, unfortunately I don't know the symbol.
moreover it seems to me that a different diet can be used, but in the photo that I attach and written in Chinese.
Someone can tell me which component I should use, and how to feed it.
Thank you all
Guido
If there is someone interested, I sell three 48v * 2 toroidal and two complete and assembled cards of the crescendo, of elektron + other 4 pairs of 2SK135 / 2SJ50 for 200 euros plus shipping costs.

 

[JonSnell Electronic]

This will help you, the standard resistor colour code. It is universal as the symbols are.

 

[russc]

I think he refer to the 2 plain black components mixed with the resistors.
Could be diodes but cannot see a white band.

 

[twocents]

I think the two black components are small inductors as there does not seem to be any indication of orientation on the pcb.

 

[twocents]

Also known as ferrite beads, like this one:
FBA04HA450VB-00 Taiyo Yuden | Mouser South Africa

 

[avtech]

They are L1 and L2 on the schematic - As others have said, small ferrite inductors.

There is some good info relating to those boards on these threads, including mods, measurements etc:

DIY Audio CS8416 + CS4398 DAC Kit Support USB + Coaxial input Hifi DAC kit
DAC: CS4398 with CS8416+CM102s

 

[guidobullo]

I found a photo where you can see that they are 100uH ferrites
thank you guys

 

[surfparadise]

Hi,

I want to buy as well this board, but I have some questions about it.... maybe you can help me.

1- could I use it with Mac OSX? Is it recognized?
2- on the back there are 2 solders points where is specified that I can power this board with 12-0-12 transformer. I don’t understand if I have to soldering together these points if I want use 12-0-12 power supply.
3- Can I use the same transformer for this board and as well for an headphone amplifier? I want buy only one transformer with 2* 12-0-12 line (10watts)
4- About the 0-9v ac Terminal block... I have to buy a transformer that have as well these output values? So, 2*12-0-12 and 1* 0-9 ??

Thank you in advance for your help

 

[russc]

From the first photo, post 1.
First supply is dual 13 to 15V. This feeds the 12V + & - regulators 7812 & 7912.
Also is a single 9 to 15V supply. This feeds the 7809 regulator.
You can use the same transformer to supply both (using 0-12 for the second supply).
I should think a 12-0-12 would be near enough but wait for more knowledgeable members to confirm.

 

[surfparadise]

But in this case, can I do a bridge with one 12v line of 12-0-12 terminal block to this point?....

 

[russc]

precisely.
Link 0 to 0.
Link 12 to 9.

 

[surfparadise]

I found this transformer:

Dual 15V 18V 24V 12V 0 12V 15V 0 15V 220V copper custom toroidal isolation transformer 30VA tube power supply 220V to dual 12V|Transformers| - AliExpress

Value of secondary: 15 12 0 12 15

Could I use it for supply these 2 boards at the same time?

New CS4398 DAC DIY Kit with USB Optical fiber 24/192K decoder Kit AC15V 32K 192K/24BIT|dac diy kit|dac diydiy dac kit - AliExpress
Lusya HA PRO2 Ultra Low Noise Low Distortion Headphone Amplifier Monitor level headphone amplifier board DIY Kits A8 018|Headphone Amplifier| - AliExpress

One need 15-0-5 and 15-0
The other one 12-0

Could I use (split) the 0 wire for the two input of the first board?
Could I use (split in 3) the sigle 0 wire for the two board?
Can I split one 15v wire to feed the second input of the first board?

Thank you for your help

 

[Boydk]

Already answered... sorry

 

[surfparadise]

The question is different. The 12-0-12 transformer is low quality so I have to buy this one. ...But it’s the first time that I use this tipe of power supply, and is not really easy to me to understand how AC current work. I have always work with DC.

I can share a 0 wire between devices? I can split a 15v wire between 2 different input on a single device?

 

[russc]

Basically, yes.

 

[surfparadise]

Thanks