Diy Dmp3

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eraos

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I found this thread in another forum about a schematic for a DMP-3 "clone."
http://studio-central.com/phpbb/viewtopic.php?t=9114&start=0&postdays=0&postorder=asc&highlight=
The diagram came from the manual of a Texas Instruments INA163 op amp.

So, I got the parts, and with the help of my brother, started piecing it together on a board, using wire-wrapping.

I have no knowledge of this kind of thing... just basic electronics knowledge.. like electricity will flow through a closed circuit..that kind of thing. That's why my brother was helping me; he started college as a EE major.

So, how to I conenct the op amps to ... everything else? They're not like a resistor or capacitor with two ends that can be wire wrapped.

Thanks in advance.
 
If you're going to do a clone of something like that ... why not do a Grace Design clone or something? I mean what's the point of spending all that time on something you could've bought for a few hundred bucks anyway? :D


I'm just messin' with ya. Good luck, and let us know how it goes.
 
diy pre-amp

often people use sockets for the chips. then wire wrap to these legs.

these opamps will have pin outs when you purchase the chip...or alias pin numbers. A1 has 8,9,10 for example.

The power supply, voltages, can be "stolen from other units but you'll probably want to build your own power supply but thats another diagram and ciruit. a few more $$...

its fun stuff and maybe will turn you into a future Design Guru.

but buying a DMP3 maybe be cheaper if your in a hurry!
I'm building a PIECE PART Audio Amplifier. (for over 2years)
The parts, hi-quality...will cost much more than if I just buy an amp...and thats a decent amp. I could buy some crap chips and be done for cheap, but then whats the point...so i hold out for Discrete components and Elcan transistors etc...
So I bought an amp and add a part here and there on my DIY for fun.
Ins and OUts are done, !10lb power supply is done with some good sht on the DC regulators.... but no amplifier circuit. :rolleyes:
 
chessrock said:
If you're going to do a clone of something like that ... why not do a Grace Design clone or something? I mean what's the point of spending all that time on something you could've bought for a few hundred bucks anyway? :D


I'm just messin' with ya. Good luck, and let us know how it goes.
Click to expand...

Actually, I already have a DMP3, which I guess is the reason why I'm building this design... other than that it's by far the simplest diagram I've found :D .
When I'm done building it--and if it turns out that it turns on when I'm done-- I want to be able to compare the two.

I'll be sure to post a comparison.
 
COOLCAT said:
often people use sockets for the chips. then wire wrap to these legs.

these opamps will have pin outs when you purchase the chip...or alias pin numbers. A1 has 8,9,10 for example.

The power supply, voltages, can be "stolen from other units but you'll probably want to build your own power supply but thats another diagram and ciruit. a few more $$...

its fun stuff and maybe will turn you into a future Design Guru.

but buying a DMP3 maybe be cheaper if your in a hurry!
I'm building a PIECE PART Audio Amplifier. (for over 2years)
The parts, hi-quality...will cost much more than if I just buy an amp...and thats a decent amp. I could buy some crap chips and be done for cheap, but then whats the point...so i hold out for Discrete components and Elcan transistors etc...
So I bought an amp and add a part here and there on my DIY for fun.
Ins and OUts are done, !10lb power supply is done with some good sht on the DC regulators.... but no amplifier circuit. :rolleyes:
Click to expand...

Yeah, I started by looking at amps to build.. but I thought this diagram was easiest to follow for a starter build. I'd like to be able to build one eventually though.


I've already got a hold of the opamps. The OPA137 is about a cm long with 4 little pins on either side, and the INA163 is almost 2cm with 7 little pins on either side. A socket will allow me to hook up everything that needs to be hooked up?

Where do I get a socket (or two)? Build it? Buy it?
Thanks.
 
Last edited:
Oh, and I see how it works now. The opamp is kind of like a computer hub in way? Allowing, in the case of the INA163, 14 things to be connected to it?
Does it matter which wire gets hooked to which component? Coolcat, you mentioned A1 having 8, 9, 10... does that mean though specific pins? or can a wire from a component be connected to any pin?
 
Sorry, one more consecutive post.

If any of you read the thread I linked to, the INA163UA is in fact the IC in the DMP3. I just openned up my real one to confirm that.
 
NO! Opamps are not hubs.

They are operational amplifiers, meaning that each opamp is like having a miniature circuit in a "black box" that you don't have to worry about, and usually each opamp has a specific purpose. Pin 1 (orient it so it's on the top left as you're looking down on the opamp with the legs facing downward away from you) will be the one where you see a white dot or a plastic nub. Here's a data sheet. The pinout is shown on one of the last pages.

http://www.technicalaudio.com/pdf/semi_IC/BB-INA163.pdf

Each pin does something different, so be sure to get orientation correct. Also consider using socket pins in the circuit board and then just "plugging" the opamp in. If you are new to soldering (or even if you aren't), chances are you'll burn out an opamp because they're pretty sensitive to heat and static. Sockets look like this:

http://www.smallbearelec.com/Search.bok?category=Sockets

and are basically just a seat for your opamp. The good news is, if your opamp blows because you messed up, you don't have to resolder, just replace the opamp with another one.

Hope that helps.

edit: BTW, that circuit is not THAT easy. Be careful to note pin numbers!
 
2cents

the diagram should come with the chip or look it up.

there will be an assigned connection for each input.

the Vcc will be your 15v's... there will be a ground etc...

draw it on a piece of paper and lay it out...

you do know you need a power supply built..or bought.
from what i've read find a electronic shop...usually there will be a gearhead who is into ti and can physically show you..

its really simple and you'll only need to see it once...all chips are basically the same with pin-outs/ pin numbers.

paia thats great stuff...
 
COOLCAT said:
the Vcc will be your 15v's... there will be a ground etc...

draw it on a piece of paper and lay it out...

you do know you need a power supply built..or bought.
.
Click to expand...

I did buy a 15v AC adaptor. We were just going to cut the plug off and strip the ends of the wires to hook to the opamp. That'll do, or no?
 
eraos said:
I did buy a 15v AC adaptor. We were just going to cut the plug off and strip the ends of the wires to hook to the opamp. That'll do, or no?
Click to expand...

Careful! My guess is that the OpAmps will need DC and not AC: http://tangentsoft.net/audio/opamp-ps.html . You could buy a DC adapter and use that, but the result will probably be noisy. Alternately, you could buy the AC adapter and build a power supply yourself. Here's one that might work, but it may be a bit more complicated than you'd like: http://sound.westhost.com/project05a.htm.

I would also recommend against cutting the plug off and stripping the wires. Use a dedicated power jack. Digikey part #CP-003A-ND might be a good place to start. I've used those with good results. They're $0.34 a piece, so they won't break your bank.

You may wish to do a little research before diving into this project. The schematic for the "DMP3" preamp looks simple enough, but it leaves out a lot of detail. You might want to start with something that has a complete schematic before moving on to this one.

Good luck!

- Jerfo
 
Well, I own a DMP3 and know for a fact that it uses an AC adaptor. Better to stick to specs and make a power supply. Hooking the voltage to the opamp defeats the purpose of the rest of the circuit, because I'm pretty sure there are some resistances it needs to go through before it hits the opamp. I'm pretty sure you need 9VAC and at least 1Amp to push the DMP3. 15V might fry your circuits. Stay as close to 9V as possible.
 
I just went to Radio Shack to pick up some sockets. The sockets were twice the size of what the opamps are though. Right number of pins, yes, but twice the size.
 
eraos said:
I just went to Radio Shack to pick up some sockets. The sockets were twice the size of what the opamps are though. Right number of pins, yes, but twice the size.
Click to expand...

That's because the RatShack sockets are for DIP packages, and what you have is a SO-14 or SOIC package for surface mounting. A SOIC to PDIP adapter is required. http://www.logicalsys.com/soic-adapter.asp

The part you would need: http://www.logicalsys.com/painfo-vpasp-vb.asp?adapter=pa-sod3sm18-14

I swear I found them for a few bucks cheaper somewhere.

Just a word of caution, I tried to put the AD8066 on an adapter to use in my Bellari MP105 and it is mighty difficult. I eventually gave up. If you have a fine point tip on your soldering iron and a steady hand it can be done. Good luck.
 
Cool, thanks.

Edit: Would I be able to pick those up at Radio Shack? Or should I order online?
 
You'll have to order them. If you a search a little you find a better deal than the link I posted.
 
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