3 Volt Car Adapter

This Circuit is 3 Volt Car Adapter using LT1074CT

We have pick multipurpose car adapter product with Output: 3V/4.5V/5V/6V/7.5V/9V/12V, 1 Amp Max, 12W. you can use in your car for multifunction

Compatibility: with 8 popular connector, this universal car charger can used in car, bus, van, truck, boat, or motorhome, works for smartphone, portable DVD Player, CD player, GPS unit, mini fan, LED strip, camera, Tablet, Mp3, Mp4, speaker, in car TV, Medela Pump-in-Style Advanced Breast Pump and more. Check it Out !

Electroscope

This Circuit can measure voltage of electrostatic charge.

Source : Elektor Circuit

This is by far the easiest and most useful. The other two both require you to mount a thin strip that is used as the indicator, and in both cases mounting this strip is a big hassle and the resulting assembly does not work very well. This scope works out of the box, and works perfectly. The readings are sensitive and reproducible. Check it Out!

Electronic Stethoscope Circuit

Using 1 BC548 Transistor ,and several passive components , and Buzzer 1 also 4,5 V Battery . Source Elektor Electronic

The modern digital stethoscope as The 3M Littmann CORE Digital Stethoscope features the outstanding acoustics, comfort and quality of a Littmann cardiology-grade stethoscope enhanced by powerful digital technology. Features like up to 40x amplification* and active noise cancellation can help you auscultate with greater confidence. The Littmann CORE Digital Stethoscope connects with Eko software on a smart device** to visualize, record and share data.

*40X amplification based on comparison of analog versus electronically assisted amplified listening with maximum volume at the peak frequency(125 Hz). Check it Out !

Digital TV Antenna

Digital antenna TV has to have capable reception on TV Band Digital TV frequency , from 470-862 MHz.

We can design with Yagi model, Logarithmic antenna Design , Fractal Antenna design or other design that proven can receive with good quality on this band. with frequency reception, we can design this :

862 - 470 = 392 , 1/2 Lambda will be , 490 + 392/2 = 666 Mhz

For Yagi antenna , I use calculation design from K7MEM.com
Ads Link

or you can also get design from Su and Chang http://www.jpier.org/PIERL/pierl12/14.09102302.pdf

The implementation looks like this :

I have tried the Su and Chang design , with good reception at Digital Terrestrial TV Channel and average quality in analog TV channel reception.

DIN rail ARM7 Ethernet/USB Subsystem (LPC2138)

This package is ideal for industrial use, facilitating quick connection and relocation
DIN rail mountable and compatible with OKW Railtec C-5 enclosure
On-board BASIC compiler runs 30 times faster than interpreted BASIC

SUCCESS

Astronomy

A NASA astronomer selected ARM Ethernet controllers to create a one-off error-correction system for an infrared telescope.

Our secondary mirror assembly would occasionally jerk. So we constructed a system using eight BMA180 accelerometers, each attached to an ARMWeb SBC.
These were then programmed to acquire and stream the accelero- meter data to a Linux server. The server would save and graph the data in real time. When an 'image jump' was recorded, this accelero-
meter data was analyzed to help identify the faulty mechanism.

—Anthony D.
University of Hawaii

APPLICATIONS

Ethernet
Wireless
Sensors
Monitoring

TECHNICAL SPECIFICATIONS

System

DIN rail enclosed 60 MHz 32 bit ARM7 CPU (LPC2138)
Programmable in a compiled BASIC, C, HTML and XML
On-board BASIC compiler runs 30 times faster than interpreted BASIC
1 million I/O operations per second

Size

88.5mm x 84mm (3.4” x 3.3”)
Compatible with DIN rail OKW Railtec C-5 enclosure

Storage

512k flash with 64k user code space
224k available for user web pages
224k user file space
32k RAM

Power

Less than 1W
5-40V DC input
Output power 3.3V regulated, 250 mA available to user

Connectors

25 pins programmable for I/O
8 x 10 bit analog A/Ds, 1 10bit DAC
Optional USB connection

DOCUMENTATION

ARM7 Ethernet/USB Microcontroller User
Guide

FREE SOFTWARE TOOLS