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Old 24th October 2011, 10:34 AM   #21
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Hi guys, I just picked the speakers up today... It's a Sony hi-fi set, model HCD-GRX7. It comes with a pair of speakers (model no. SS-J75) impedance 8 ohms. On the back of the stereo it says "AC: 220-240V~50/60Hz 250W." The speakers each have one pretty bassy driver and 3 tweeters.

So what now? Remember this is all going into a recycled speaker box dimensions are 580x410x210. It will play anything with a 3.5mm auxillary jack and preferably have a volt gauge and a volume control, all powered by a 12v battery(or whatever other recommendation you have).


Cheers
Jo
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Old 24th October 2011, 03:27 PM   #22
JoelS is offline JoelS  United States
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nice! you got something to get started. the first thing is to take apart those SS-J75 speakers to figure out how to mount the woofers and tweeters inside your recycled speaker box. pay attention to how all the wires are connected inside and there are probably a few other parts near the tweeter that works as a crossover. you will want to connect the speakers and crossover parts exactly as they were when they came out of the original box. The nice thing about the sony HCD-GRX7 is that I was able to easily find a service manual for it by searching around the web. I recommend that you look for it because it has alot of nice diagrams of all the parts inside. I browsed through the service manual briefly and found that the power amplifier is built onto a seperate circuit board and easily removed. unfortunately that model is not designed to work from a battery but it might work. maybe you will need 2 batteries because the circuit wants to have both a positive and negative voltage. also it looks like you can take out the headphone jack to use as the input to connect your ipod. I assume that you don't care about the CD player, cassette, and radio tuner so just put those aside. the headphone jack and the power amplifier boards will have wires and connectors attached to them, try to save those as you can re-use them when reconnecting the parts in your box. you will still need batteries but then that's enough parts to get going if you give up the battery meter and use the ipod volume control instead of adding a volume knob. you can also add those later once you have the first part going. here's a very simple diagram: (attached) the connectors and pin numbers correspond to what's shown in the service manual. I added the 22k resistor because the amplifier has an enable input that wants to be turned on by a controller on another board, this resistor takes the place of the controller board.
what does everybody think? the power connector on the amp is really meant to connect to a transformer secondary, and the voltage is supposed to be much higher, about +/- 43 volts. it goes right to a bridge rectifier so connecting DC battery to it shouldn't really be a problem. I'm hoping that the lower voltage wont be a big problem, just not as loud.
good luck!
-Joel
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File Type: jpg block-diagram.jpg (23.0 KB, 162 views)
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Old 27th October 2011, 10:32 AM   #23
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Okay I have already taken the speakers apart, and the stereo unit but I think the reusing of the amp board IS NOT HAPPENING. Hahahah it's way too complicated and I don't know what I'm doing so I will just donate it to the second hand store...

So what amp and batteries would I be looking at getting? I think I want to remove the middle tweeter from each speaker as it is sorta damaged. Will that work? And how am I wiring these things up? I would put some pictures up but I don't know how to make it into a URL.


Jo
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Old 27th October 2011, 10:56 AM   #24
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Default amplifier

what about using something like this to keep things simple. it even has a diagram of where to connect the wires, you would need 2 one to drive the left channel and theother to drive the right channel.

18W Universal Amplifier Module : Audio Modules : Maplin

also it will use any dc voltage from 6v-20v.

hope that helps

cheers
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Old 27th October 2011, 11:19 AM   #25
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Hi Jo-Ann, welcome to the forums.

If you can get hold of some 24v batteries, consider something like this:
2*100w TK2050 TP2050 Tripath Class-D Audio Amplifier | eBay

You connect up the power supply, speakers and iPod and it'll make music.

Could you post a picture of the speakers you have? I can't find any reliable images on Google of what they may be.

Cheers,
Chris
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Old 27th October 2011, 02:45 PM   #26
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Parts Express has a video how to on hooking up the Sure amp boards. I think you will find it encouraging. Good luck

Last edited by Darkstar52; 27th October 2011 at 02:48 PM.
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Old 28th October 2011, 12:36 AM   #27
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Hello everyone,

Attached are the pictures of the speakers. The middle tweeter is sorta damaged on this one, but on the other one the paper cone(oh forgive me for not using the correct terms!) has a hole in it. I'm thinking of just removing both middle tweeters from the system but I'm not sure if it will work because it has a capacitor looking thing on it. If it won't work, could you please advice on how I should wire these up so it works?

Chris, what's the difference between 12V batteries and 24V? What's the difference between AC and DC? For this setup should I be looking at AC or DC?

So basically now all I need is just an amplifier and a battery? What main points should I be looking out for when choosing an amp and the batteries to give me the most efficient system possible? Bear in mind I plan to remove the middle tweeter from the speakers.

This is fantastic. We are getting somewhere - I never thought I could! Haha. I'd love to see the end result, I'm excited!

Click the image to open in full size.
Click the image to open in full size.
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Old 28th October 2011, 12:38 AM   #28
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I don't know if the image links are working so here they are:

IMG_2400 | Flickr - Photo Sharing!
IMG_2403 | Flickr - Photo Sharing!
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Old 28th October 2011, 02:38 AM   #29
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Location: Minneapolis, Minnesota, USA
I did'nt look at entire thread, so apologies if someone already suggested this, but here's some good info for beginners, about half-way down the page.

DIY Audio Articles

Mike
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Old 28th October 2011, 08:48 AM   #30
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Quote:
Originally Posted by absolutjoann View Post
I don't know if the image links are working so here they are:

IMG_2400 | Flickr - Photo Sharing!
IMG_2403 | Flickr - Photo Sharing!
Depending on how it's wired, you could probably just disconnect the middle one if you're unhappy using it in its damaged state. It will probably work okay.

My initial ideas for a boombox layout would be (from the inside outwards per side) Woofer, super tweeter (the little round one nearest the top), then a vertical line of the 3 midranges.
Make it symmetrical across the front and you're good to go.

I suppose you could put one of the mids on the top/side/back to widen dispersion...

Chris

Last edited by chris661; 28th October 2011 at 08:52 AM.
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