Tips

Simulating a Filter Circuit (Equalizer) using CircuitLab

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Applications, Promotion, Tips
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CircuitLab.com is a cool web-based “workbench” where you can create circuits and simulate it.  You can do DC analysis, Time Domain, Frequency Domain analysis. I think it’s a great learning tool to “experiment” with circuits and see what will happen.  No special software need to be installed, you can run it on your web browser. I’m using Chrome browser in this example.

For example, shown below is a simplified circuit of the mid-frequencies of an LC based equalizer.  To keep things simple, we’re using 10K resistors, 10K potentiometer (represented by R4/R5) and a 0.1uf, 100mH and 1K resistors for the RLC component of our filter circuit.

EQ1

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Difference between “Single-Supply” and “Rail-to-Rail” Opamps

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Tips
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An opamp usually doesn’t know where the “Ground” terminal, so one can normally operate an opamp from a dual power supply (i.e. also called split power supply, +/-V supply voltages) or from single-supply voltages.  As long as you don’t exceed the Maximum Ratings specified by the Opamp datasheet, you can operate opamps using either single or dual supplies.

When you browse manufacturer websites though, you often see some Opamps specified as “Single-supply” and some as “Rail-to-Rail” opamps… what do they mean by this?

Before we highlight the difference between a “single-supply” and a “rail-to-rail” opamp, let’s show how a “normal” opamp behaves.

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How to: Eagle CAD to 3D Rendering Views

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Today I learned how to create 3D renderings of Eagle Boards.  I’ll share with you how I got this image below.

FAB1515-REVA-3D

 

You’e probably seen this board design, it’s from my last blog posting. It’s a split +/-15V DC/DC Converter power supply, which also accepts our FAB-1248 Plugin module (for 48V DC output).

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How to make your own cable – 10pin Female-to-Female Ribbon Cable

We now sell a 6″ long Female-to-Female Ribbon Cable for use with FABModules. Click here to BUY a ready-made cable.

This 10-pin ribbon cable is required to connect the Power Supply FAB1215 to your FAB Module setup. If you’re using a FAB-to-Cable crossover adapter (FAB9001), you’ll also need this cable.

Step 1:  Cut your cable 7.5″ long.  Position cable as shown below, then crimp the connector. You can use an adjustable jaw pliers. I suggest wrapping the plastic connectors with cloth/rag to protect it before using the pliers.

CableStep1

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Decibels and Voltages. dB, dBu… How do I convert from Volts to dB?

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Okay, how do we find out what’s the maximum output capability of your FAB module system? To answer this question, we first need to segue and talk about decibels.

Wikipedia says: The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level.

Basically, it’s saying that decibel is nothing but a RATIO between 2 numbers. Example: Instead of saying the 2nd number is 2X the value of the 1st number, we say it’s 6dB larger, or 6dB more.  A decibel allows us to compare 2 numbers logarithmically, comparing 2 numbers whose ratio are either very, very small or very, very large.

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