This filter allows you to remove frequency band from a signal. In the example below, we’ll design a 50Hz notch filter. This allows us to remove the 50Hz hum picked up by, say, a microphone cord. Of course, it can be easily designed for 60Hz as well.
Read more original source:
http://www.hobby-electronics.info/projects/TwinTFilter.html
The simple Function generator two waveform, It produces triangle and square waves from 1Hz up to 1MHz. The Amplitude, offset and duty cycle are adjustable to offer wide range of generated signals. The important part of the circuit is LM566 or NE566. I used R2 controls Frequency output. The power supply voltage is 9V [...]
This is a simple high pitch noise generator circuit. It has a timer oscillator with a frequency variable from 15khz - 30khz.
The circuit can be mounted in a plastic box like I have done. The good thing about high frequency sounds is that it is very hard to find where they are coming from. Also, [...]
Best View 800x600 pixel
Email : 
Copyright 2008 www.elecfree.com/electronic/
Genwi
