How to use the sound amplifier out of a alarm clock, for an iPod?

I have an old "I home" clock radio alarm clock. I would like to use the amplifier parts for an old radio housing with a larger speaker.
i have checked around and there are a lot of instuctables out her that do something like this, but nothing that I'm finding for me that helps. Isn't there an amplifier board somewhere in this thing I can use?  Can't I just solder the correct parts together and use the connectors off the boards? I'm really new at this but have wanted to try this for some time. Too advanced for me?
Any info would help!


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rickharris4 years ago
The radio side of the alarm clock will look something like the attached diagram.

Perhaps the best way is to keep everything together - look for the Speaker connections and trace them back until you find either an IC or a bunch of transistors that will be the audio amplifier.

Find an audio source that isn't important to you (things may go wrong and you don't want to ruin your Ipod) - An old transistor radio will do -

Bearing in mind your alarm radio has mains voltages in there so it can be dangerous or at least painful take extreme care.

Use a lead from you audio source to try to find the connections on the audio amp that work for you.

NOW having said all that it is MUCH simpler - More reliable and safer to go out a buy a couple of powered speakers and use them - Computer speakers are very cheap these days and often come with built in amplifier.
radio.jpg
lemonie4 years ago
If you show us pictures people may be able to point at the parts you have.

L
SlickSqueegie (author)  lemonie4 years ago
Here are the images of the boards that came out of the Ihome Radio...
I do have another cheap radio I can part out... the other one might be a little less technical as it is just your basic knob and switch 2 speakers and a tuner. but it has no inputs.... I can pull that one out and take it apart if needed...
I have an old antique tube radio from the 30's the case is in fantastic condition the knobs are all there. I'd like to use this as the cabinete for the amp stuff...
IMG_0918.JPGIMG_0917.JPGIMG_0916.JPGIMG_0915.JPG
The one with the ferrite-cored copper-coil coated in wax on is the radio-receiver. You should be able to find the audio-out from that board, and after that the audio-in on the amplifier.

I think that your amplifier is attached to the alu'-heat-sink - the audio-signal inputs should /may be on the three-pin socket.

L
SlickSqueegie (author)  lemonie4 years ago
As much as I want this to be amplified (with the stuff I already have) I'm just going to have to wait until i find a set of amplified speakers at a flea market or yard sale. at that point i think ill add the volume control and have it amplified...

On a side note, after doing this radio speaker, I am flooded with ideas for building a new case for a speaker with some exotic wood and very good quality speakers. as well as a good amplifier for the whole setup. basically design and build my own with a built in dock for charging...

I am still going to try to get this IHome working, if anything just to learn from it. I had all the boards plugged in properly layed out on my bench with an ipod plugged into the dock. but the buttons that switch between inputs and radio, just dont work. so i got no sound out of it.. but that was because i couldnt switch over to the ipod input....
how would I bypass that??? lol
As I said: you bypass things by connecting the audio lines(s) directly to the amplifier-board, which also appears to have the main power-supply on it.
One of the sockets on this will be audio-in.

L
t.bmp
Re-design4 years ago
"Cant i just solder the correct parts". Yes, and that's the whole problem. we don't know what parts you have and you don't know what the correct parts are. And you do have to put the correct parts in the right order or you get nothing that works.  You might try starting with an electronics tutorial and work you way up.
SlickSqueegie (author)  Re-design4 years ago
Well, that's what imlooking for here... I've searched google and here, but what I ding most are people that are using components out of odds and ends parts... I know this alarm clock radio has an amplifier in it, I just need to know what I'm looking for...
I guess I should have asked does anyone know of a decent tutorial on this please link it...
I repair radios and amps, so I can look at most radios and tell how to use it for an amp.  Maybe do a little testing.

But there are thousands of ways to make a clock radio and without knowing what parts you have it's impossible to answer your question.

Some radios are so easy to use as amps all it would take is making two connections and that's all.  Some are so integrated that to use it as an amp you would have to take it all apart and start over.
Start by looking at all the components in the radio and IDing them. All the Chips/IC's, regulators and anything else in a black case have codes etched in them. Unless its a crappy radio and the manufacture removed the markings. But you can type that info on the chips into google and pull up data sheets on them to find out what they do. Once you've found the 1 or more audio amplifiers in the unit you can start looking for schematics based on those amps. Often the data sheets will have a basic schematic demonstrating how the parts are used.