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Old 5th October 2016, 10:55 AM   #1
bugbear is offline bugbear  United Kingdom
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Location: Norfolk/Suffolk border
Default Old Tuner - good case for Pi + HiFiBerry DAC?

I have a hankering for a Raspberry Pi based sound system.

Pretty routine stuff;

https://www.hifiberry.com/dacplus/

RuneAudio - Embedded Hi-Fi music player

https://volumio.org/discover/

But I need a PSU (possibly a regulated one ) and a case.

I note that old tuners are very much unloved, at yard sales, car boots, flea markets, eBay.

Is an old digital tuner (slimline, simple facia, a few buttons) a practical source of a cheap
case (and possibly other parts) ?

e.g.
Technics ST-X902L

Or are there difficulties I haven't thought of?


BugBear
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Old 6th October 2016, 06:48 PM   #2
chrisb is offline chrisb  Canada
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On many small projects, the most frustrating / expensive part can be finding /fabricating a suitable chassis, so there's a lot of appeal to this type of recycling - and there certainly appears to be lots of available real estate in this case.

The only difficulty I can foresee is the number of control functions / display incorporated in the front fascia, which on this class of unit are usually an integral part of the chassis. They are often not designed for disassembly / repair, so take care in releasing any plastic retaining clips, etc.
Once those are stripped away, you'll have a lot of openings to fill / block off, and lettering to cover.

It would appear that the main AC switch is on a separate daughter board, which could make for easy retention of that function, and the power supply might well be adequate for at least some of the intended new components.
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Old 7th October 2016, 08:52 AM   #3
bugbear is offline bugbear  United Kingdom
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Quote:
Originally Posted by chrisb View Post
On many small projects, the most frustrating / expensive part can be finding /fabricating a suitable chassis, so there's a lot of appeal to this type of recycling - and there certainly appears to be lots of available real estate in this case.

The only difficulty I can foresee is the number of control functions / display incorporated in the front fascia, which on this class of unit are usually an integral part of the chassis. They are often not designed for disassembly / repair, so take care in releasing any plastic retaining clips, etc.
Once those are stripped away, you'll have a lot of openings to fill / block off, and lettering to cover.

It would appear that the main AC switch is on a separate daughter board, which could make for easy retention of that function, and the power supply might well be adequate for at least some of the intended new components.
I'll take that as a "yes", with caveats.

Thank you.

BugBear
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Old 7th October 2016, 11:38 PM   #4
chrisb is offline chrisb  Canada
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I think that's what I was getting at
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Old 9th October 2016, 06:07 PM   #5
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This is why I used an sx-3700 and sx780 to house new amp and preamp circuitry.
sx-3700 has an excellent tuner
sx 780 has power amp VAS stage regulators from separate transformer winding.
with Mosfet outputs instead of STK paks the 780 clips around 75w RMS 8 ohms !
Amps are very similar to Honey Badger Amp detailed in another thread.
both units easily accept a tube preamp with capacitor voltage doubler.
You could place your Raspberry Pi unit inside the case and dedicate the AUX or 1 Tape monitor input to it.

Last edited by stocktrader200; 9th October 2016 at 06:10 PM.
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Old 10th October 2016, 05:14 PM   #6
Bare is offline Bare  Canada
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Old Electronics contraptions cases are certainly recylclabe/ useable.
But a Pi with dac attached is about the size of a Cigarette package.
Talk about a little boy in a Cathederal :-)
Lotsa bespoke plastic Pi cases available from *many* sources from V cheap to; are you serious? pricings.
Also 1 $ stores carry an assortment of almost free 1/8" ply boxes in various sizes configurations which at least could be size appropriate with contained hardware.
Likely less coin than some clapped out Gear for it's case buy.
Imo a Regulated PS is Audio Weenie overkill.
But we all have our own belief systems.
A simple Battery is a Very clean reliable power source, worthy of trying out. Before futzing about on a 'suitable' PS quest
Going to buy/use a tablet screen for the above ?
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Old 13th October 2016, 04:58 PM   #7
bugbear is offline bugbear  United Kingdom
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Quote:
Originally Posted by Bare View Post
Old Electronics contraptions cases are certainly recylclabe/ useable.
But a Pi with dac attached is about the size of a Cigarette package.
Talk about a little boy in a Cathederal :-)
Lotsa bespoke plastic Pi cases available from *many* sources from V cheap to; are you serious? pricings.
Also 1 $ stores carry an assortment of almost free 1/8" ply boxes in various sizes configurations which at least could be size appropriate with contained hardware.
Likely less coin than some clapped out Gear for it's case buy.
Imo a Regulated PS is Audio Weenie overkill.
But we all have our own belief systems.
A simple Battery is a Very clean reliable power source, worthy of trying out. Before futzing about on a 'suitable' PS quest
Going to buy/use a tablet screen for the above ?
Part of the plan is that the resulting tuner-with-pi-and-power-supply will be a standard width "normal" hifi box I can simply add to my hifi rack.

As you say, a Pi is tiny; but that's not an undliuted Good -for example, it would likely just move around under the weight of the phono lead!

BugBear
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Old 14th October 2016, 09:47 AM   #8
bugbear is offline bugbear  United Kingdom
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Damn.

I wanted to use the Pi 3's built in WiFi as part of Volumio's GUI, using either my laptop or tablet as the control.

But if I put the Pi in a metal case AKA Faraday shield that won't work...

Bugbear
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Old 19th October 2016, 02:24 AM   #9
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Quote:
Originally Posted by bugbear View Post
Damn.

I wanted to use the Pi 3's built in WiFi as part of Volumio's GUI, using either my laptop or tablet as the control.

But if I put the Pi in a metal case AKA Faraday shield that won't work...

Bugbear
If you get a USB wifi adapter with an antenna, you could drill a hole in the back of the tuner and have the antenna stick out.

Something like this would be perfect:

Rosewill WiFi Adapter
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Old 19th October 2016, 04:08 PM   #10
Jerms is offline Jerms  United Kingdom
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Location: High Wycombe, Bucks, UK.
Quote:
Originally Posted by bugbear View Post
Damn.

I wanted to use the Pi 3's built in WiFi as part of Volumio's GUI, using either my laptop or tablet as the control.

But if I put the Pi in a metal case AKA Faraday shield that won't work...

Bugbear
If you're brave....

External antenna modifications for the Raspberry Pi 3 | DorkbotPDX

J.
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