Journal #6340
Posted 14 years ago2010-01-22 13:54:52 UTC
Hey Twhlers.
My final semester of my 2year degree program started yesterday, and i was wondering if there's any Electronics Eggheads out there.
My final project is due in may, but we need to start it ASAP. My next class isn't 'til Thursday (when the final designs have to be in and approved), and i just stayed up til 3AM getting the first part of this working in the simulation software...
Anyway, I'm an Electronic Engineering student, and my final project is going to be a guitar pedal.
It has 2 main parts to it. 1) Distortion 2) Tremolo effect
I got the distortion down, it was as simple as using 1 BJT and a reversed-pair of low-power diodes to clip the output waveform... and a potentiometer to control the amount of gain etc etc...
But i'm having trouble doing the tremolo. I want to use a 555-Timer to power on and off an op-amp with a gain of 1.
I have the timer set perfectly within the time ranges i want (1hz - 60hz) and i even have a pulsing LED to show the timing. But i can't for the life of me figure out the op-amp....
If anyone knows which op-amp would be good to use with a 9V supply, and if i really need a positive and negative input or can i just use a +9 and a GND input on the - input?
Idk... Well i have almost another whole week to figure this out, but if anyone could help, it'd be amazing....
My final semester of my 2year degree program started yesterday, and i was wondering if there's any Electronics Eggheads out there.
My final project is due in may, but we need to start it ASAP. My next class isn't 'til Thursday (when the final designs have to be in and approved), and i just stayed up til 3AM getting the first part of this working in the simulation software...
Anyway, I'm an Electronic Engineering student, and my final project is going to be a guitar pedal.
It has 2 main parts to it. 1) Distortion 2) Tremolo effect
I got the distortion down, it was as simple as using 1 BJT and a reversed-pair of low-power diodes to clip the output waveform... and a potentiometer to control the amount of gain etc etc...
I have the timer set perfectly within the time ranges i want (1hz - 60hz) and i even have a pulsing LED to show the timing. But i can't for the life of me figure out the op-amp....
Idk... Well i have almost another whole week to figure this out, but if anyone could help, it'd be amazing....
8 Comments
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I feel I have to ask you, why exactly a toggling op-amp, wouldn't you prefer it powered more like a sine wave? At least that's what I'd expect from a tremolo effect-er.
)
In other news, my 9" fan shorted out and the wires got so hot they un-soldered themselves..... therefore i'm down to only a 120mm output fan until i get my hands on a new iron.. >.<
What do you use to draw the circuits?
Heh. I used a computer power supply 80mm fan in hot summer days a couple of years ago. Then I turned the voltage dial on my custom-made power supply too far, and something burned out in it. I'm on the look for a new one. The 20" standing fan should do well meanwhile.
I do believe you can get a triangle wave out of a 555 timer... maybe i can look into that. But it has to wait until Monday because the trial edition has a watered down parts list... it doesn't have the low-power op-amp i need.