Electronics > Beginners

USB audio DAC, bluetooth reciver and shielded relays for tube amplifier

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Gyro:
@Audioguru:

There are still plenty of audio transformer manufacturers (not sure about Canadian suppliers, but certainly US and Europe) and vacuum tubes are still readily available. As for the reason, builder's choice.

@WildMOSFET:

Looking at your images, the mains transformer and output transformer are not in the ideal orientation (windings all vertical) you are running some risk of induced hum.

WildMOSFET:

--- Quote from: Gyro on March 17, 2019, 10:36:59 pm ---@Audioguru:

There are still plenty of audio transformer manufacturers (not sure about Canadian suppliers, but certainly US and Europe) and vacuum tubes are still readily available. As for the reason, builder's choice.

@WildMOSFET:

Looking at your images, the mains transformer and output transformer are not in the ideal orientation (windings all vertical) you are running some risk of induced hum.

--- End quote ---

I agree, as far as the material is concerned, you can find everything, just search on ebay to get an idea.

@Gyro, you're right, the power transformer must be placed horizontally and the cores must not be aligned. I missed this detail.

I think I found everything:

USB-DAC -> Line output:

https://it.aliexpress.com/item/Lusya-XMOS-U8-AK4490-Modulo-NE5532-DAC-USB-Decoder-Scheda-Audio-Supporto-per-16-32bit-192/32880205812.html?spm=a2g0y.search0104.3.63.60e1497fC73gt8&ws_ab_test=searchweb0_0%2Csearchweb201602_7_10065_10068_10890_319_10546_317_10548_10696_10084_453_454_10083_10618_10304_10307_10820_537_536_10902_10843_10059_10884_10887_321_322_10103%2Csearchweb201603_51%2CppcSwitch_0&algo_pvid=d72ff831-4e2d-40db-b39c-97785c5e06da&algo_expid=d72ff831-4e2d-40db-b39c-97785c5e06da-9

Bluetooth receiver -> Line output:

https://it.aliexpress.com/item/Lusya-CSR8675-Bluetooth-5-0-Senza-Fili-a-Bordo-del-Ricevitore-PCM5102A-I2S-DAC-scheda-di/32889060488.html?spm=a2g0y.10010108.1000023.14.299013e3edP6bo

Gyro:

--- Quote from: WildMOSFET on March 18, 2019, 11:03:32 am ---
Bluetooth receiver -> Line output:

https://it.aliexpress.com/item/Lusya-CSR8675-Bluetooth-5-0-Senza-Fili-a-Bordo-del-Ricevitore-PCM5102A-I2S-DAC-scheda-di/32889060488.html?spm=a2g0y.10010108.1000023.14.299013e3edP6bo

--- End quote ---

The PCM5102A sounds very nice in the Arcam miniBlink. Of course implementation is everything, with much more impact than the devices used.

DimitriP:

--- Quote from: Audioguru on March 17, 2019, 10:28:58 pm ---Why are you designing an antique vacuum tubes amplifier that is 60 years old?
Where will you find the vacuum tubes and output transformers today?

--- End quote ---

Transformers are easy. He can order from "next door"   http://www.antoniadis.com/   if he can't find anyting locally.


WildMOSFET:

--- Quote from: Gyro on March 18, 2019, 06:49:56 pm ---
--- Quote from: WildMOSFET on March 18, 2019, 11:03:32 am ---
Bluetooth receiver -> Line output:

https://it.aliexpress.com/item/Lusya-CSR8675-Bluetooth-5-0-Senza-Fili-a-Bordo-del-Ricevitore-PCM5102A-I2S-DAC-scheda-di/32889060488.html?spm=a2g0y.10010108.1000023.14.299013e3edP6bo

--- End quote ---

The PCM5102A sounds very nice in the Arcam miniBlink. Of course implementation is everything, with much more impact than the devices used.

--- End quote ---

I was looking at the datasheet of the components and they seem to have good features.:-DMM

@Gyro: Thanks for the feedback on PCM5102A. I agree on the implementation.

Instead regarding the relays for the selection of the inputs, I think they go well with the simple miniaturized relays.
If the contact area is small and the positioning is correct, they should not absorb many electrical disturbances.
If it works badly I can add a shield around (obviously connected to the ground). :-/O

If anyone is interested, I put the datsheets below. :bullshit:

USB-DAC:

https://www.akm.com/akm/en/file/datasheet/AK4490EQ.pdf
http://www.ti.com/lit/ds/symlink/ne5532.pdf

Bluetooth reciver:

https://www.qualcomm.com/media/documents/files/csr8675-product-brief.pdf
http://www.ti.com/lit/ds/symlink/pcm5102a.pdf

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