What would you add?

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yokel22
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What would you add?

Post by yokel22 » Mon Jun 05, 2017 1:47 am

I was looking for something fun to build to break me out a bit of a funk. This project seemed to tick most of the boxes for me as it combines three of my favorite interests, music, woodworking, and programming. The main idea for this was to build a small amp to power a pair of Elac B6 bookshelf speakers i picked up a few months ago. It's sorta evolved into something else at this point & i think i just wanna go over the top with it. There's a few pics below of the current setup & a parts list. At this point i know i want to add an RGB LED array of some kind for notifications. I'm thinking the top of the box i will do like these veneer over lexan lamps i did a while ago to let the RBG shine though: http://lumberjocks.com/projects/59385 . I plan on doing some copper inlay on the box to connect the capacitive buttons to(right now they are just attached to copper tape). I also plan on adding a display for showing a basic web-ui for(now playing info, weather, HA stuff).

So the question is. If it were you, what would you add?

Forum upload seems to be broken @ the moment, so i used dropbox.
https://www.dropbox.com/s/727x08mzxlzm2 ... 1.jpg?dl=0
https://www.dropbox.com/s/ctjym24aiuqim ... 2.jpg?dl=0
https://www.dropbox.com/s/1x0btdh4ahtyle6/2.jpg?dl=0




Main Parts

Raspberry Pi 3: $35 - https://www.amazon.com/Raspberry-Model- ... berry+pi+3

Pi noIR v.2 camera sensor: $28 - https://www.amazon.com/Raspberry-Pi-NoI ... +pi+camera

Capacitive touch hat: $15 - https://www.adafruit.com/product/2340

PiDigi-Amp+ speaker amplifier hat: $69 - http://iqaudio.co.uk/audio/9-pi-digiamp ... 99650.html

DHT22 Temp/Humidity sensor: $8 - https://www.amazon.com/gp/product/B071N ... UTF8&psc=1

TSL2561 lux/light sensor: $6 - https://www.adafruit.com/product/439

HC-SR501 PIR motion sensor: $3.50 - https://www.amazon.com/Motion-HC-SR501- ... SV785WW5BY

Small Parts

Power button: $5 - https://www.adafruit.com/product/917

Rotory encoder(for volume/shutdown/reboot): $2.50 - http://iqaudio.co.uk/accessories/34-rot ... witch.html

Sequin LED's(for various indicators, motion detected, capacitive button press, video recording/shutdown/reboot): $4 - https://www.adafruit.com/product/3377

Vibration motor(for haptic feedback on capacitive touch): $2 - https://www.adafruit.com/product/1201

Volume knob(rotory encoder): $5 - http://iqaudio.co.uk/accessories/37-bla ... -28mm.html

IR receiver(for IR remote): $2 - https://www.adafruit.com/product/157

IR LED's(for illumation of nightvision camera): $3.50 - https://www.amazon.com/TOMTOP-150mw-Inf ... rds=ir+led

DC panel mounted input(power): $3 - https://www.adafruit.com/product/610

HDMI panel mounted breakout: $6 - https://www.adafruit.com/product/978

Binding posts(for speaker output) $6 - https://www.amazon.com/Vktech-Amplifier ... nding+post

Female jumper cables: $6 - https://www.amazon.com/gp/product/B01L5 ... 5UPIIBDRLP

Edit: Added power brick to build list.

Power supply: $33(already had one, why i forgot to list it. 4.5amps @ 19v) - https://www.amazon.com/Prudentway-PWI-A ... B0068IWUEC

Stuff I'm thinking about adding

Matrix Voice board: $55 - https://www.indiegogo.com/projects/matr ... -for-all#/
This would take care of the RGB array i'm wanting plus give a non cloud mic array.

PaPiRus Eink display: $50 - https://www.adafruit.com/product/3420
Neat, but probably sucks in low light situations.
Last edited by yokel22 on Wed Jun 07, 2017 4:23 pm, edited 2 times in total.

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kgschlosser
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Re: What would you add?

Post by kgschlosser » Wed Jun 07, 2017 8:04 am

some actual cahones to power those bookshelves. The 10 watts nominal at best from that sound board isn't gonna do squat. does the thing even have an external power supply? If not then guess what you would be lucky to see 2 watts out of it. I don't know how they can state that is does 35 a channel. if it doesn't have an external power supply do you think that you can run 14 amps of current through the regulator of the raspberry? the real question would be is do you have a 5 volt supply capable of delivering 14 amps?.

and say it does have an external power supply. It would probably be a 12 volt supply. You would need a little under 6 amps. and this is not doing the typical adjustment for efficiency. so add another 10% to that for running power and loss due to heat)

my point being is that those kinds of cars are meant to drive a set of non amplified computer speakers.. and that is not what those bookshelf speakers are. you are not doing them any justice powering them with just the card. you need an amp on em. you should be able to pick up something used for pretty cheap. 50 x 2 would do the job. stay away from amps that are sold at places like guitar center. the reason why is these amps are designed for a purpose to do a fantastic job at making things in the mid/high frequency range very loud because there is no instrument that can create the low low bass that you here in music. so the amps are not built with strong enough power supplies. and what happens is when you have it crankin and you hit a low tone it will stress the power supply causing the voltage to drop and the highs are what really suffer from this.

in a past life i designed audio systems. mainly in vehicles but also for bars and clubs. I designed and built the worlds loudest vehicle. held the record for 10 or so years. 169.8dB most of the gear was made/altered for this car. I am sure if you poke around you would be able to find a small footprint old school amp. you could even use something like a jlaudio xd amp and a computer PS to power the thing. those amps are extremely small and extremely efficient and you could locate one probably on craigs list or a pawn shop. probably wouldn't cost but 20 or 30 dollars US. nice thing is if you use a computer PS you would have all the voltages you need to run everything in a single package for very cheap.
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yokel22
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Re: What would you add?

Post by yokel22 » Wed Jun 07, 2017 1:42 pm

It has an external power supply. Will run on 15-19v, then down converts and passes 5v via header on the pi. Your way off base. This amp is designed to run high powered bookshelves(up to 35watts a channel). It powers my elac's just fine(rated at 22watts). They actually sound a bit nicer than when connected to my denon avr. Check out IQ's website they make some nice cards.

Everything pictured is up and running now and able to be powered from the one brick(I'm running at 19v). It's officially an appliance at this point. Your correct though, i may run into some power supply issues if i try to add much more to it. That's why i may add a second pi and switch the camera/display/rgb to it.

I also think you missed the whole point. If i wanted to buy a cheap amp i would. I wanted something more like a sonos connect amp,which this is, except it does a hell of a lot more for way less. Also, it's really just something i'm doing for my own enjoyment.

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kgschlosser
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Re: What would you add?

Post by kgschlosser » Sun Jun 11, 2017 6:13 pm

i got ya on this. but simple math dictates the impossibility of that card ever outputting anything even remotely close to 35 watts even if it is running at 100% efficiency. This has been a plague of the audio world and the card manufacturers listing what the on board amp being capable of doing as per the chip manufacturers specification and not what the chip actually does when it is being used on their card in their configuration with the supply voltage they are using

But the end end result is if you are happy with it then it doesn't matter. you could use a PS for a computer break off the power for the card being drawn through the regulator on the PI because of the stability of the voltage and the lack of any ac bounce this would not be an issue and would also eliminate the need for a second Pi and you can get a PSU for a PC that is more then capable for around 15.00 USD. because the draw is so slow you could use a pot based fan controller to attach to the internal fan on the PSU to slow it down. might even be able to remove the fan all together because the draw would be so low. also makes it nice not having a brick hanging on your wall. and gives you a means to be able to unplug the cord from the cabinet.
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