Crystal Tester Circuit


The circuit is use for test Quartz Crystal from 1 MHz to 50 MHz, if the crystal X1 good enough, sinewave will appears on Emiter T1 BF494 , and rectified by D2 IN4148 , drive D1 IN4148 and will charge Capacitor C4 until enough voltage to turn on Transistor BC547 and make the LED 1 on. This circuit using 9 V battery for enough consumption , below is PCB you can design . ( Source : Elektor Summer circuit)

Wideband Spark Transmissions Signal Receiver


This is circuit for Fun, receive spark transmissions signal from switch on off light , motors, high voltage lightning , electric motors can detected by this receiver on short wave band.

AM SW Converter with NE602

If you have old AM radio , you can use this circuit to change to Short Wave Radio, and tune the Short Wave frequency and start listening Short Wave around the world. The AM SW short wave radio can works from 1.6 MHz until 10 MHz by C1 with various values. from 150 pF until 10 pF , or you can use Trimmer Capacitor from 0-200 pF. For Crystals X1 can use 34.545 MHZ overtone crystal.


As datasheet NE602 describe , the features of this IC :

* Low current consumption : typical 2.4 mA
* Excellent noise figure : < 4.7 dB typical at 45 MHz
* High Operating frequency
* Excellent gain : intercept and sensitivity
* Low external parts count ; suitable for crystal / ceramics filter

NE602 Pin Out :



Test Configuration for NE602 , look at Crystal on Pin 6.





Applications :
* Portable Radio
* Cellular Radio

Example for Cellular Radio Application :

* VHF Transceivers
* RF Data Links
* HF / VHF Frequency conversion
* Instrumentation frequency conversion
* Broadband LANs


Voice Memory Circuit Using Single Chip ISD1416 from Winbond

Voice IC recording system memory , ISD1416 from Winbond can use for many application such Answering Machine Phone, Talking Clocks also for private application such as in Public Services to tell People How To use Toilet, private toilet by record instruction for 2 minutes.

The Features of ISD1416 :

* Easy to use single chip voice record/playback solution
* High quality, natural voice/audio reproduction
* Push button interface
   - Playback can be edge or level activated

* Single chip durations of 16 and 20 seconds
* Automatic power down mode
  - Enters standby mode immediately following a record or playback cycle
  - Standby current 0.5 uA (typical)
* Zero power message storage
  - Eliminates battery backup circuits
* Fully addressable to handle multiple messages
* 100 year message retention (typical)
* 100,000 record cycles (typical)
* On-chip clock source
* No programmer or development system needed
* Single +5 volt power supply
* Available in die form, DIP, and SOIC packaging
* Industriall temperature (-40 Celcius degree to +85 Celcius degree) versions available

ISD 1400 Series Pinouts

 Application Note example from datasheet ISD1416


 For datasheet ISD1416 Please click here.


Simple Remote Control Tester

When your remote control  TV problems , because not works well , you can use this circuit to check .


This circuit using BP103 which is photo transistor who will response to infra red spectrum when remote control TV problem.
Transistor BC548 will biases and turn LED D1 will flash when you test your remote by pressing the button and make sure the infra red of remote works well. Check it Out!

We have Generic Universal Tv Ir Remote Control Decoder Tester Infrared Remote Control Testing. with this tool you can answer the questions  :

(1)How to confirm different TV remote controls can be compatible with each other?
(2)My TV remote control doesn't work, if you don't have the one I need,which model can take place of it?


Use this to test functionality of the remotes before listing them. Super easy to use and does exactly what it is supposed to..

Free Electricity Using Magnet and AC Motor

Magnet Neodymium circle , Big Magnet (blue) replace on between small magnet ( orange circle magnet). Small magnet replace with strong glue on Axis of AC Motor , uses 3 small magnet. And Big magnet glue on static body of AC Motor . Ignition Piezo connected to pole of motor . And after everything is done connected , tested by push the Piezo Ignition on , just once , and the AC Motor will running , and magnet will generate current and supply to bulb, and the bulb light on .


EEPROM Programmer for PC 16C84

This circuit is for EEPROM Programmer using Parallel Port on PC for Programming PIC 16C84 Microcontroller.





Source Elektor Electronic

AM Longwave and Shortwave PC Radio

This circuit is Radio with 1 Transistor you can get supply for PC and listening from PC Speaker.

Source Elektor Electronic

One Transistor Radio

This Circuit is One transistor Radio for All AM longwave and shortwave signal. The Transistor use for demodulation and amplification signal from 1.5 m antenna from ferrite Rod.
The headphone used as supply power from battery 1.5 Volt , also turn off the supply when unplug.


For L1 you can used ferrite rod and AM and SW winding. Coil is made up by using 26 SWG 100 turns on ferrite rod.

Learn about AM and FM radio technology and the the functional components used in creating AM-FM receivers and amplifiers. 56 page training course is divided 
into 9 lessons; Audio Amplifier, AM Detector, AM IF, AM Amplifier, AM Mixer & Oscillator, FM Detector, 1st FM IF, 2nd FM IF, FM RF Stages. “Superheterodyne” 
designed to receive standard AM and FM broadcast frequencies. New transistor module allows you to switch between the modern integrated circuit (IC) technology 
and the original transistor technology. Includes radio mounting stand. 

The AM/FM Radio project is divided into two parts, the AM Radio Section and the FM Radio Section. Initially, only identify the parts that you will need for the AM radio as listed in the manual. Do not open the bags listed for the FM radio. 
A separate parts list will be shown for the FM radio after you have completed the AM radio. 9 volt battery needed but not included.


Audio Amp, AM Detector, AM IF, AM Amp, AM Mixer & Oscillator, FM Detector, 2 x FM IF, FM RF Stages. With 56 page Training Course is divided into 9 lessons. Check it Out !

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

 
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
FREE SOFTWARE TOOLS

ARM7 Ethernet Microcontroller 60 MHz (LPC2138)


  • Provides 10MB Ethernet connectivity
  • Simplifies integration with Web page and controller hardware 

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
  • Logging
  • Monitoring

TECHNICAL SPECIFICATIONS

System

  • Board-mounted 60 MHz 32 bit ARM7 CPU (LPC2138)
  • Programmable in a compiled BASIC, C, HTML, and XML
  • Operates faster than 10 million BASIC lines/second

Size

  • 75mm x 120mm
  • Compatible with Hammond 1455K1201 enclosure

Storage

  • 64k user code space (5,000 Instructions)
  • 5k user data
  • 224k user file space
  • 32k RAM

Power

  • 750 mW
  • 5-6V DC input
  • Battery RTC option

Connectors

  • USB
  • Connections for 31 digital I/O
  • 8 x 10 bit analog A/Ds, 1 10bit DAC
DOCUMENTATION
FREE SOFTWARE TOOLS