New Posts  All Forums:Forum Nav:

Cmoy OP AMP help.

post #1 of 35
8/2/08 at 8:59pm
Thread Starter 
My question is about the op amps from Radio Shack. Can anyone help me with choosing the right one that will complete the job for the time being. I'll get me a better op amp from digi key but I wanted to try out a Radio Shack one since it's down the street.

Going with Tangents build, which can I use? Should I go with 9V or 18V for it? ANy help is greatly appreciated.



Oh, and what kind of wires can I use for the connections and stuff? Can I get it at Radio Shack?
Reply
post #2 of 35
8/2/08 at 9:20pm
I can't recall the part number, but the dual-channel opamp that I tried from RS did not work with the Tangent circuit.
Reply
post #3 of 35
8/2/08 at 10:12pm
Tangent's basic CMoy build calls for a 9v battery. Any hookup wire should work from 24-20 guage. I used wire from RS. I have read that folks have had sucess using a RS op amp, but I do not know off hand the particular model number.
Reply
post #4 of 35
8/2/08 at 11:12pm
tl082 but needs more than 9 volt to operate.
Reply
post #5 of 35
8/3/08 at 12:44am
Thread Starter 
Thanks guys.

So heatmizer, that would mean that I would have to wire the 9v batteries in series for 18v and would that be enough?
Reply
post #6 of 35
8/3/08 at 2:02am
Yup. check out Tangents "Notes on Opamps"
Reply
post #7 of 35
8/3/08 at 3:04am
Radioshack stocks the NE5532 which works fine in the CMoy ckt, but you may want to eventually upgrade it.
Reply
post #8 of 35
8/3/08 at 5:01am
DC offset will probably be too high with the NE5532 with the standard resistor values. You will have to adjust them to bring offset down to reasonable levels.
Reply
post #9 of 35
8/3/08 at 8:15pm
Thread Starter 
Tangent, question.

I got most of the Radio Shack parts and all I need is the volume controller. Is there anything in Radio Shack that's small enough to use with the tins? Also, they had the TL082. I'm basically using what's readily available since I'm going to experiment on this build before going online and ordering better parts. I'm going to be wiring the two 9V in series to get 18V. I would assume that would be enough for that OP Amp.

Oh, and I have to look for that board. I went to 2 Radio Shack and the only one they had was the 276-168 board. I wonder if that's good enough or not.

Thanks for the help guys. I'll be building this tomorrow when I get a chance. Can't wait.
Reply
post #10 of 35
8/3/08 at 8:27pm
My very first CMoy used a Radio Shack volume control. I don't remember the part number, and as you can see from the pics, you have to notch the lid to make it close -- the nut is about the same as the tin's height. It's an ugly hack, but a workable one.
Reply
post #11 of 35
8/4/08 at 2:21pm
Thread Starter 
Thanks Spud. I just looked at those pictures and now I have an idea. I actually found a Mini controller that's 10K.

Question from the nOOby man, about this picture I'll bring up can you guys help me out with the polarity or which end is which? I knew that I should've paid attention when I was in middle school about these electronic shops. That was years ago. Years.



Sorry for the picture. I don't have the tripod at the moment and I had to take it unmounted. Kind of blurry but I had to use my macro lens. So it gets a bit tricky shooting those macro shots.
Reply
post #12 of 35
8/4/08 at 2:28pm
That is 47 ohms. There is no polarity
Nice picture by the way. Are you using an SLR?
Reply
post #13 of 35
8/4/08 at 2:31pm
Thread Starter 
Mkay. I was right. Thanks. So how can you tell on which side I should put in or not? Or can I just put it in without any problems? If so, then I would assume that I can place them all facing the same way and that would be ok right?
Reply
post #14 of 35
8/4/08 at 2:37pm
Think of a resistor as a pipe. It doesn't matter which end, as the thing is the same at both ends. All you need to do to make it work is have both ends connected.
Capacitors are another story. Electrolytic ones are like a valve. They only work in one direction. If you put it in the wrong way nothing can go through.
Reply
post #15 of 35
8/4/08 at 2:40pm
Thread Starter 
Wow. Now that I like. Thanks. So say, Yellow;Violet; Black;Brown and Brown would make 4700 which is 4.7K correct?
Reply
New Posts  All Forums:Forum Nav:
  Return Home