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MP
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Posts posted by MP
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Are you sure the system is not de-activating the on-board sound card since you are using the address for the new sound card? You might have a conflict even after you make the hardware.
Not being a fan of Linux, my suggestion would be to uninstall Linux and....problem solved.
MP -
Yes, surface mount can be used. I would not recommend the use of TO92 style regulators since the TO220 have a nice heat dissipation.
MP -
Here is a site that might prove to be helpful to you. It deals with troubleshooting noise such as alternator noise in your audio circuits. Perhaps something in this article will jump out at you since you are really the only one who knows how you put this project together and where wires are placed, etc...
http://www.termpro.com/articles/noise.html
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...then type CLS to get rid of all the other garbage. (Clear Screen)
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yeah, but that really does not matter since answers to questions posted on this forum by one person could be the solution to another member's problem as well.
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Homework assignment?
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this topic should be removed....no one should be told to google before posting. E-Lab is the ultimate source of information.
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Kevin,
Post a drawing. There could be a number of reasons.
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Maxim has an application note regarding this. I suggest that you go through it and make sure you are meeting all the requirements.
http://www.maxim-ic.com/appnotes.cfm/appnote_number/3607
MP -
Perhaps this link will help:
http://www.wrighthobbies.net/examples/wirelessdata.htm
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Jiro,
Here is a pdf copy of a function generator kit that is commercially available.
Have fun!
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You can get a vocal remover patch for Winamp here: http://www.analogx.com/contents/download/audio/vremover.htm
It uses a digital algorithm instead of hardware.
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No, I did not design the fuzz circuit Jesus posted. It is a standard that has been used for many years. It works and has worked well for many. I have a similar circuit inside the plate on an older guitar that I have from the late 60's.
Again, there is nothing wrong with the design. There are much better designs, but if his circuit is not working, it is not due to the design. It is due to making it incorrectly. (That is not theory...that is fact).
MP -
how do you use capacitors in a circuit
By applying voltage to them. They don't do anything without the voltage... 8)
MP
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uh....yeah.... I am sure they are just doing that to fool the noobies.... ::)
MP -
Claudio,
I have much more trouble with Portugese when I am in Brazil than what you seem to be having with English on this forum.
Welcome to the forum!
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MP, you have shown that you don't know about the input impedance of opamp circuits.
yeah....whatever.... ::)
...guess it was just luck that got me my Engineering degree.... you technicians could teach us a lot.
MP
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Sorry MP but you are wrong.
R3 is the input resistance of the inverting opamp amplifier which is 1k ohms. The 0.47uF input coupling capacitor has a reactance of 1k ohms at 340 Hz, so the load to a guitar pickup is only 2k ohms at 340Hz and less at higher frequencies.
Many experts say that a guitar pickup must be loaded with a very high impedance:
Well, I just got back from a business trip and found your post.
No. I am not wrong. Some of the guitar effects which use a 1K input resistor to the op-amp are:
Ibanez Graphic EQ
MXR Flanger
Ross Stereo Delay
Ibanez TS9 Tube Screamer
Ibanez TS-808 Tube Screamer
MXR Hot Tubes Distortion
MANY MANY more........
Also, note that you are mis-quoting the "experts" regarding the guitar pick up. All guitar pick ups have loading provided on the guitar circuitry under the plate. You do not need to add it. Guitar pickups do not connect directly to the jack.
I have actually been one of these guitar effects "experts" since the mid 70's.
Also note that the C1 and R1 combination makes for a low cut frequency calculated as C=1/ (6.28)*(Low Cut off freq in HZ)*(R1).
MP
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Darlington transistors also have a resistor between base and emitter.
Not always. They are used both ways...which is another example of situations that do not require this resistor.
MP
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Don't use an LM386 as a pre-amp. It will be too much for your guitar amp.
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It is the same circuit as the opamp circuit by Jesus a couple of days ago.
Its 1k input imedance is too low for a guitar's pickup.
R3 has no direct effect on the impedance of the guitar pickup. The value of R3 is selected to provide two things:
1. amplification with respect to the feedback resistor and
2. Filtering as per calculation with C1.
You guys missed the input cap. Jesus and Aaron win the prize with the effect that will not load down the guitar pickup as the volume is changed.
MP
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I was searching in the iternet and I want to make a fuzz effect for my electric guitar. Because I found one and not work. Can anyone help me?
Jesus,
There is nothing wrong with the design of your fuzz circuit. In fact, it is an older classic fuzz circuit from the 60s or 70s as I recall. I recommend that you check for mis-connection. Also, I would recommend that you replace the 1N4001 diodes with 1N914. You could even replace these with LEDs and the circuit would work. Also, I suggest that where you have a 1Meg ohm resistor, make this a 1K ohm resistor with a 1M pot in series. This will give you a level of fuzz adjustment. Note that it will also act as a volume control.
MP
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You just need to make sure your negative lead on the power supply output is 1.2 volts lower than the common connection of the LM317. The output of the power supply does not have to have it's zero potential connected to the "ground" pin of the LM317. Does that help? There are a number of ways to do this. You can purchase a -1.2V precision reference IC, use voltage dividers, op-amps, additional regulators, transistors, etc.
BTW....LM317 is a positive voltage regulator. If you are going to use another regulator for a negative voltage reference, you would want to use the LM337 for this. It is a negative adj. voltage regulator.
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There are many applications where a resistor between base and emitter is not needed on a transistor.
"Always" is certainly an exaggeration.
Also note, protection from radio waves requires filtering. A resistor does not protect against radio interference.
MP
How many people here scrap old electronics?
in Electronics chit chat
Posted
I had a small TV that I needed to get rid of. It was dead. The metal scrapper would not take it...the dump would not take it...so, I put it on the curb in front of my house with a sign that said "FREE", and it was gone the very next day. 8)
Love those guys that like to tear things apart!! Maybe nevermind1281 lives in my neighborhood?
MP