My First Schematic

[GT2]

well i am not sure its good because i don't know how to test it...
can anyone tell me if it's good or not or how can test it? i am using EWB(electronics workbench) and i want to know what should be my input voltage and frequency and what should be my output voltage and frequency as well so i can test it...
here is my schematic:

[GT2]

anyone?

[dave_neal_59]

A guitar signal is approximately 100 mV to 300 mV depending on how hot the pickups are.  The frequencies for a guitar are from about 82 (low E) to 1320 (24th fret high E).

Your output is going to be limited by the LEDs.   I don't know the specific voltages for a red and green LED.   You should see an output of approximately 1.5V.

[GT2]

whats the maximum voltage i can plug to my amp without destroying it?

[eetfuk]

Well, after what ive experienced, you cannot destoy your amp with a 9v battery atleast, I dont know the max. But i guess it depends.

[GT2]

so i can put a 1 volt AC voltage and nothing will happend?

[eetfuk]

Yes, i guess so. Even though im uncertain

These circuts dont produce enough Watt to inflict any damage to your amplifier.
If the signal voltage get to high, the amp will distort, but this will not damage it im certain!

[GT2]

my guitar is plugged to my computer and i don't want to burn my sound card...
when i am using 300 mv with a 1320 hz frequency and the drive pot is on 99% i am getting 700 mv on the output...
when i am using 1% its good it's almost the same voltage only when i raise the drive pot i am getting more AV and to much voltage on the output...
how can i fix it?

[eetfuk]

Well, perhaps if you add a resistor between the tone and vol pot, and also make it a large one. I think this should lower the output voltage.

[GT2]

i want it to lower th output voltage only when i am using a lot of gain...
maybe i should use 300 mv diodes and lower resistance pot instead?

[slacker]

Sorry if this sounds too obvious but if the output is too loud turn the volume pot down. Unless you've wired the volume pot wrong or it's broken you should be able to turn the output down to zero.

[GT2]

again you are not solving my problem...
i want that on hi gain only i will have lower volume because when i am on low gain its fine...

[Jeremy]

You know, with nearly all distortions, high gain sounds louder than low gain.  If it really bothers you, you can use a dual pot for gain, and use the extra part as a variable resistor to place between the tone and volume pots.  That way, the output volume will be attenuated more when you turn up the gain.

But I don't suggest doing that, because I think you don't need it. 

Using silicon diodes instead of LEDs will decrease your output level (you can use one silicon and one germanium if you want asymetrical clipping, or one diode in one direction and two in the other).  This will also lower your threshold for distortion; your guitar won't have to be as loud to make the effect start to distort.  Perhaps this is what you want.

Don't change the size of the volume pot; it's unneccesary.  It will probably just draw more current from the op amp without lowering your volume much.  If you want to make the signal quieter in that part of the circuit, add a series resistor before the volume pot, as was suggested before.

Adding a 100k resistor before the 100k pot will lower your max output by 6dB, which will sound about half as loud.

Cheers

[GT2]

its not about loudness i think that doubling my voltage by 7 is a little bit to much for an amp...
i changed my diodes to 1n914 when i wrote the results i just forgot to mention this in here... sorry...
well i think i should use 300 mv diodes and lower resistance pot instead as i said earlier what diodes should fit?