Make Windows 7 Look Awesome Drawings' title='Make Windows 7 Look Awesome Drawings' />INFILTEC How to Build an Inexpensive Seismometer. ELECTRONICS. I will start with electronics since I think that is. Most of the seismic circuit designs that I have seen. They generally have. AD. and PC interface. They also use dual power supplies. I work in a tiny apartment, and use two 24 monitors. I needed a workstation that fits into a tiny niche, but can still accommodate me for many hours every day and. Detailed instructions, including diagrams, description of components, setup and synchronization. I have attempted to make use of some of the recent. My design goal was a single board that did. When shooting a documentary, the vast majority of what you film gets edited out of the final production. But instead of letting thousands of hours of breathtaking. One of the cardinal rules of engagement on the internet is Dont Read the Comments. But if, like us, you spend the better part of your day scouring the internet for. Thanks for the tips the keyboard shortcuts are great and very easy I agree that the Windows 7 sticky notes are useful, but they would look better and fit well on my. Corvettes are dirty cars. I dont care how many times they go to LeMans with the Z06, a Corvette will always remind me of Dirk Diggler, the 1970s, shag carpeting. Here is my simplified design for Lehman. It requires a single ended 5. RS 2. 32 data output. There is no sacrifice in signal processing quality due. Bessel filter and 1. My circuit uses only 4 low power chips. VOLTAGE REGULATOR AND REFERENCE CHIP. Make Windows 7 Look Awesome Drawings' title='Make Windows 7 Look Awesome Drawings' />LP2. ACZ 5. Micropower Voltage Regulator provides a 1. This chip. requires 5. C. A resistor voltage divider is used to create a stable 2. The 2. 0k ohm voltage divider uses about 0. Net power requirements 0. The total board power requirement is low enough 5 ma 5 v so that it can. PC serial port. Since the 1. PC power from the serial port. I could do RC. filtering on it to smooth it out. So far, I have not found this to be necessary. AMPLIFIER CHIP To allow my circuit to work with a single ended 5v supply. Illustrator Shows How Disney Princesses Would Look Like If They Lived In 2017, And The Result Is Awesome. I bias my sensor coil by about 2. I have a single op amp stage for gain. Lehman and 2. 6k gain for geophones. So my op amp output is 2. Learning should be fun and interactive for kids. The 10 best educational websites for kids gives your kids computer time and helps them learn everything from science. This allows me to use a 0 5v 1. My op amp chip must run off a single 5. V supply, have. a rail to rail output, low noise level under 1. VHz 1. 0 Hz. CMRR at 2. B, low offset drift under 0. VC. low offset voltage under 5. F, and low power operation under 3 ma. I came up with these specifications by trying some other chips that. For low impedance sensors like geophones I like the. LT1. 67. 7CN8 Low Noise, Rail to Rail Precision Op Amp. It works best with. Rs less than 4. 00 ohms and possibly up to Rs as high as 8k ohms. Above that Rs, the data sheet says the noise is significantly higher. However, this chip seems to work well with. Lehman coil. The chip requires 5 volts, single supply, 2. Specs include. noise 7. VHz 1. 0 Hz, CMRR 1. B, Offset Drift 0. VC, Input Offset Voltage 6. V. For higher impedance sensors I like the. TLC2. 20. 1CP Low Noise Precision Rail To Rail Output Op Amp. The TLC2. 20. 1ACP and TLC2. BCP have better guaranteed specs. This chip requires 5 volts, single supply, 1. VHz 1. 0 Hz, CMRR 8. B, Offset Drift 0. VC, Input Offset Voltage 5. V. Since the op amp output goes into the switched capacitor filter it. I find that an RC filter using a capacitor Cf. Rf works fine if I set the RC filter. Fc. 1 to about 1. Fc. 2. For instance, if the Fc. Hz for a typical Lehman, then Fc. Hz, and Cf should be chosen so that Fc. Hz 12Piff. For 4. Hz geophones, I set Fc. Hz and Fc. 2 to about 6. Hz. For ADXL1. 05 accelerometers I use the same filtering as I use for. Hz geophones, and I use the on board op amp rather than a. MAX7. 40. 1CPA 8th Order, Lowpass, Bessel, Switched Capacitor Filter. I generally use. a cutoff of 1 Hz for a Lehman and 4. Hz for a 4. 5 Hz geophone. This chip requires 5 volts, single supply, 2 ma. The 3 d. B filter cutoff Fc. Hz is determined by Fc. C where C is the capacitance in ufd. For example, when C. Fc. 2. 3. 80C 1 Hz. The output. of a switched capacitor must be filtered to remove the switching. Fc. 2 for this chip. I generally use. an RC filter with an Fc. Fc. 2. So in the. Fc. 2 of 1 Hz, then R3 and C3 should be chosen. Fc. 3 12i33 1. Hz. For 4. 5 Hz geophones I set Fc. Hz. For ADXL1. 05 accelerometers I use the same filtering as. I use for the 4. 5 Hz geophones. AD PC INTERFACE CHIP. PIC1. 40. 00 0. 4SP Programmable Mixed Signal Controller. I wrote to configure IC pins for 1. AD, and for serial output to a PC. This chip requires 5 volts, single supply, 0. Lawrence Axial Flow Manual. PIC 8 bit microprocessors can be programmed in firmware written in languages like. Pic. Basic. Pro or. You might be able to use a. Basic Stamp BS1 or BS2 processor. AD chip in place of the PIC1. However, these. processors and the ad chip may use too much power to use the serial. PCB LAYOUT AND NOISE REDUCTION. In order to get 1. All grounds must go to a central terminal. All chips must have bypass capacitors. In addition, the PIC1. SAMPLING RATE. The 4 MHz PIC1. AD at about 6. 0 samples per second SPS and. I have written the firmware. SPS to 2. 0 SPS. SERIAL DATA FORMAT. Each output sample is an ASCII record terminated by LF and CR. The samples range from. This format can be read by the. Output from Amaseis can be further. Win. Quake seismic event viewing software. PICTURES AND DIAGRAMS OF MY LATEST SYSTEM DESIGNS. Click on thumbnails below for full screen images. Short Period Seismometer complete system with electronics and sensor. Infiltec QM 4. 5 L1. B exterior. Infiltec QM 4. L1. 5B interior. Infiltec QM 4. L1. 5B circuit board, enclosure and. Hz geophone. Long Period Seismometer partial system with electroncs but no sensor. Infiltec QM 1. 0 3. Exterior. Infiltec QM 1. Interior. Infiltec QM 1. Note that the long period QM 1. QM 4. 5. board except for passive component value changes to reduce the low pass filtering to 1 Hz. The QM 1. 0 is designed to work with a 9k ohm pickup coil and moving magnet. Here is the QM circuit schematic diagram. SAMPLE OUTPUT. How well does this circuit work Here is the. January 1. Central American quake. QM 1. 0 Lehman from approximately 3,0. Artist Repaints Mass Produced Dolls To Make Them Look More Realistic, And The Result Is Amazing. Some people might say that dolls are toys for kids and nothing more. But incredible artists can change the minds of the harshest critics. Noel Cruz is one of those people. The Filipino artist, currently working in the USA, repaints regular dolls making them into real one of a kind pieces of art. He has transformed many simple dolls giving them realistic faces of actors and characters. Noels repaints are done with intricate detail to the point of being naturally lifelike in essence. Repainted dolls are sold as collectors items and are wildly popular. Take a look at some of the before after images and be amazed by the talent of Noel Cruz. More info ncruz. Facebook Instagram noeling.