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Old 03-27-2005, 08:33 PM   #1
stapuff
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Default Homemade sirius boombox

A couple of weeks ago when I was getting ready to go on a trip to the bahamas for spring break, (just got back friday) I was thinking about bringing my audiovox pnp3 with me. I called up circuit city and other places looking for a boombox for the pnp3, but nobody had them. I got an idea. Make one.

Looking in my room, I found an old sanyo boombox that has a tape player, cd player and am/fm tuner. I went to work getting the pnp3 hooked to the boombox. Mounting it was easy using the home kit cradle. I removed the screws from the cradle base, drilled 2 holes in the boombox above the left speaker to match the base, and mounted the cradle by attaching the screws from the inside. It is sturdy and almost level.

The antenna is mounted behind the pnp3 and is easily removeable when the antenna needs to be away from the radio. It is a bit close to the pnp3 and the audio connector gets in the way, but it works fine. I am thinking about putting in hooks to reel up the antenna cable instead of leaving it dangling on the side.

Power was easy to hook up because the boombox and the pnp3 run on 12 volts. All I needed to do was cut the end off the home power supply, drill a hole in the boombox for the wire, and splice the wire into the 12 volt feed from the boombox. The boombox runs off AC supplied or battery supplied 12 volt DC power. The pnp3 drains a bit more off the AC power supply making the ripple larger (if you know about dc power supplies, then you know what im talking about). Im thinking about putting in a bigger capacitor to smooth the ripple. The ripple causes a noticeable 60Hz hum in the speakers when running the pnp3. When running on batteries, the output is clean.

Battery consumption hasnt really been tested yet, but I put in 8 new energizer alkaline (non rechargeable) D batteries before the trip, and the boombox has been listened to for about 12 hours and is still running strong. Fresh batteries supplied 12 volts, and it is now down to about 9.5 volts. I will see how low it will go.

At first I was going to have the audio run from the fm modulator to the fm tuner, but the boombox having a non digital tuner made frequency stability a problem (aside from interference and the other usual fm modulator problems). I decided to wire the pnp3 into the tape player. I found the lines from the tape player for the left, right and ground wires and wired them into an old 1/8" stereo headphone connector and ran the cable through a drilled hole in the boombox. The tape position (compared to cd player or am/fm tuner) for the boombox is also the off position, and no power is consumed unless a button is pressed in (play/rew/ff). Pressing a button closes a simple reed switch in the tape mechanism. I isolated and wired the switch to the circuit that activates the amplifier and effectively keeps the tape motor and preamp from turning on now.

To summarize, the tape player has been disconnected, but pressing a button turns on the amplifier that is wired directly to the pnp3. This works well, but the audio level produced by the tape player is lower than the output of the pnp3. The volume control on the boombox distorts about 1/4 of the intended maximum level (the audio level adjustment on the pnp3 doesnt help). I am thinking about attenuating the audio output from the pnp3 to better match what the tape player put out.

Here are the pictures. Sorry about the blurry pictures, my camera sucks. If you have questions or are thinking of doing something similar, let me know. I'll give you some tips.

edit: the wires coming out of the side of the base are connected to solder pads inside the unit for some kind of data interface so that I can mess with it without having to take it apart again. I made a thread in the help forum asking for info about it.






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Old 03-27-2005, 10:16 PM   #2
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Kudos for your efforts, but I've been there and done that and I am NOT going back... It make a lot more sense to just go out and buy a Audiovox boombox and be done with it. It easier to carry around you don't have to do any modifications.

There was a time when the only boombox we had for SIRIUS was a home made one. I made a couple of them in that first year that SIRIUS started, but there just isn't anything like a boombox that is made for a particular tuner.

I also have a Cambridge Boombox that I have used many times with my Audiovox XR9 tuner, but it required ZERO modifications to work via the power and audio side. It isn't fm modulated either, its direct connect. In fact all the boomboxes I ever made were direct connect.
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Old 03-28-2005, 05:50 AM   #3
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Quote:
Originally Posted by DAB
Kudos for your efforts, but I've been there and done that and I am NOT going back... It make a lot more sense to just go out and buy a Audiovox boombox and be done with it. It easier to carry around you don't have to do any modifications.

There was a time when the only boombox we had for SIRIUS was a home made one. I made a couple of them in that first year that SIRIUS started, but there just isn't anything like a boombox that is made for a particular tuner.

I also have a Cambridge Boombox that I have used many times with my Audiovox XR9 tuner, but it required ZERO modifications to work via the power and audio side. It isn't fm modulated either, its direct connect. In fact all the boomboxes I ever made were direct connect.
I'll eventually end up probably buying the one made for the pnp3, but I made this in time for my trip. Either that, or I might try building the pnp unit into the tape slot. The size seems like it will fit in there well. That would be cool.
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Old 03-28-2005, 08:43 AM   #4
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[quote="stapuff"]
Quote:
Originally Posted by DAB
I might try building the pnp unit into the tape slot. The size seems like it will fit in there well. That would be cool.
I take it you just like to piddle with this type stuff, because honestly there is no reason on earth to fool with that type modification, unless you just like piddling. When you consider the time and effort its simply not worth it in my opinion.
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Old 03-28-2005, 08:56 PM   #5
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[quote="DAB"]
Quote:
Originally Posted by stapuff
Quote:
Originally Posted by DAB
I might try building the pnp unit into the tape slot. The size seems like it will fit in there well. That would be cool.
I take it you just like to piddle with this type stuff, because honestly there is no reason on earth to fool with that type modification, unless you just like piddling. When you consider the time and effort its simply not worth it in my opinion.
I am a piddler. heheheh. I almost enjoy the mods to my car and boombox as much as the music.
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Old 03-28-2005, 09:38 PM   #6
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More power to ya!!! (Hey, while you’re at it, could ya figure out how to put an aux-in port on the car mount for either the JVC SR200, Jensen/PNP2, or Dish SR200? Thanks)
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Old 04-01-2005, 05:44 PM   #7
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Quote:
Originally Posted by 608zz
More power to ya!!! (Hey, while you?re at it, could ya figure out how to put an aux-in port on the car mount for either the JVC SR200, Jensen/PNP2, or Dish SR200? Thanks)
If I had one to mess with, I bet I could figure it out. So there isnt a 1/8" stereo port on the back of it? What is it missing?
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Old 04-02-2005, 10:49 AM   #8
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Default Boombox

Maybe just dremel out the cd player and cassette.Who needs em...
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Old 04-02-2005, 01:54 PM   #9
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Quote:
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Maybe just dremel out the cd player and cassette.Who needs em...
I'll keep the CD player. The cassette is already toast. I am still contemplating moving it.
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Old 08-17-2006, 05:03 PM   #10
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Default great idea

Good for you that you got that all put together. If you're into electronics and you see how you can hook it up, why not? Enjoy it and tell me if you know of a way to make it brew beer or wash clothes.
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Old 08-27-2006, 02:05 PM   #11
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thats so funny. i mean funny in a good way. just an fyi. if you do get a sirius boombox, and you dont like the fact there is not any f.m. in case you listen to glenn beck, michael savage, or another talk station, nike makes a portable fm tuner meant for runners that is about the size of a golfball. i use it all the time outside when i am doing landscaping around the house and i know i am gonna end up flipping between satellite and f.m.
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Old 08-27-2006, 06:42 PM   #12
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a thread from a year and four months ago...
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