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The Cheapest Automatic Pool Water Filler!

You do not want to waste hundreds of dollars when buying a pool water filler, but you desperately need one to maintain your swimming pool water clean? Well, your wish is granted, as today you’ll have a chance to build an automatic pool water filler, originally designed by Jon Rutlen. The point is that this pool water filler is extremely cheap – it only cost you less than $15! Yep, that might sound unbelievable, but it’s the truth. This device is simply incredible, it automatically adds water to your pool when it gets below a specified level. Here are steps on how to build this incredible filter: First of all, you have to cut the vertical piece of pipe, which is used to hold the entire assembly over the side of your pool. Next, add two 90-degree elbows to the vertical piece. Then, epoxy toilet valve into 90-degree elbow. Remember to cut two shorter lengths of PVC pipe and insert one into each of the 90-degree elbows on the vertical piece. Assemble the coupler, attach the hose coupler and toilet valve to vertical assembly.

DIY an USB Audio DAC and Leave More Green Cow in Your Wallet!

Have immensely interest in the audio DAC design, and would like to DIY a low cost but powerful audio DAC? Ok, now you have the chance, as you’ll learn to create your very own audio DAC today. You will use the circuit PCM2902 for this project, where you will need to design the DAC from USB with this circuit on a one-sided PCB! Since the circuit board is a well designed wrong board, everything besides the crystal and USB connector will be placed from the bottom. Below here is the schematic diagram from datasheet of PCM2902.

DIY Class A MOSFET Headphone Amplifier Can’t Even Be Easy Than Before!

You’re not satisfied with your desktop headphone amplifier? Then, just stop the complaint and DIY Class A MOSFET headphone amplifier! First, you will need to use a regulated power supply, which can be purchased from Radio Shack (10-20VDC and 750mA should be OK). The regulated power supply is responsible for regulating the power supply will ripple the rejection and eliminate any noise in the power supply. An IRF610 MOSFET and an LM317 regulator will be used in the Class A Mosfet headphone amplifier. Here is the step-by-step guide for the project; let’s get started… Firstly, you have to prepare an external CD-ROM (It would be better to have a power switch, power adapter receptacle, RCA inputs on the back, and headphone jack on the front). The amplifier is constructed on 2″ square protoboards from Radio Shack. You will need to assemble these components onto the board:

The Good Helper for Pressure Sensor – DIY Force Sensitive Resistor (FSR)

Do you wish to have a thin, accurate, and durable Force Sensitive Resistor (FSR) to help you to sense the surface pressure? Well, would you want to spend over $50 for just an adequate quality FSR, while you can DIY it with less than $20 here? First of all, you have to prepare the require tools and components: Tools

DIY Sound Card – Is Time For You to Blast Off The Music

Do you think making a sound card is a complex and impossible mission? Then, you’d better think again… If you use the IC PCM2702 from Texas Instruments, you will create a powerful and well-built USB sound card. The best thing about a DIY USB sound card is you don’t need to install any driver for Windows XP/Vista, as they are already built-in. Just plug and play it! This construction’s central core is a 16-Bit Stereo Digital-To-Analog Convertor with the USB interface PCM2702, of course. You need several additional parts to work with the PCM2702, and it’s not complex as you’ve thought here. The sound card can be powered directly from the USB port (jumper W1) or the external power supply (jumper W3). Two power supplies, 3.3V (3V-6V) and 5V (4.5V-5.5V), are needed for PCM2702.

Build a powerful bi-directional 2.4 GHz amplifier for less than $100

Would you want to add a bi-directional 2.4GHz amplifier to your proxim Symphony with less than $100? If you nodded your head, then pay attention to this project, as this will benefit you in the long run…

Ok, the meaning for bi-directional means you can simply mount the amplifier at the antenna, which this help to overcome any cable loss. In addition to it, the amplifier also can automatically switch between receive and transmit modes.

Some of the components you needed: