# Tag Info

### Converting an FM square wave into an FM waveform that is sinusoidal

It's rather easy with a switched-capacitor low-pass filter. They are available as ICs from various vendors. You need a PLL oscillator that tracks the square wave and multiplies it by the factor ...

### Band pass filter with LED

Here is an example of "what to do" and use. Made with microcap v12 In color blue are the results of the Transient Analysis for the LED current. All currents that are above 4 mA will light ...
• 14.7k

### Band pass filter with LED

What is the problem? I see quite a few (NOTE: some of them do not relate to your actual frequency-lighting stuff but the overall circuit design). C7 does nothing other than load the signal generator....
• 37.2k

### What is the correct formula for the 3 dB frequency of an RC or LC Circuit?

Facts: There are $2\pi$ radians in one complete revolution of a circle. It's the circumference of a circle with radius 1. If that circle revolves at 1 turn per second (equivalent to a frequency of ...
• 465k

### What is the correct formula for the 3 dB frequency of an RC or LC Circuit?

Angular frequency Omega is 2pi*f so the formulas are correct.
• 161k