Owner: Cool Electronic Circuits URL:http://free-electronic-circuit.blogspot.com/ Join Date: Fri, 06 Jun 2008 08:16:34 -0500 Rating:0 Site Description: Cool Circuit Collections : Electronic Circuit, Circuit Design, RF Circuit, AF Circuits, Printed Circuit Boards Prototype Site statistics:Click here
RF Dual DC Motors Controller 2008-06-03 11:32:23 The transmitter circuit consists of WZ-X01 RF module, Holtek HT-640 encoder and 8 bit A/D converter. U1 ADC0804 converts the analog voltage to digital data, U2 encodes that data (D0~D6) along with D6, D7 and transmitting through the RF transmitter module.The potentiometer VR1 varies the voltage to the A/D U1 pin6, since only the lower 6 bits are used; the trim pot VR2 has to adjust so that the max Read more:Motors
Telemetry Transmitter for Small Animal 2008-06-03 11:23:50 The goal of this project was to build a small, cheap, light-weight telemetry transmitter to attach to a small animal. This version uses a commercial, low-power transmitter, the Radiotronix RCT-433-AS. The design worked well, but has a relatively high current draw of about 500 microamps. A CR1620 lithium coin cell runs the circuit for about a week. The current version uses a pair of CMOS oscillator Read more:Transmitter
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, Animal
River Level Monitoring System - RiverSpy2 #2 2008-06-03 11:14:46 How to get startedAs you can see from the picture at part #1, the original system was prototyped using veroboard. If you are not familiar with electronics, you will find it easier to build using a printed circuit board (pcb). The layout files are given below. You can order from within the expresspcb program. The MiniBoard service at expresspcb costs US$83 for 3 boards, including a courier service Read more:River
, System
River Level Monitoring System - RiverSpy2 #1 2008-06-03 11:09:21 System OverviewThe diagram below gives an overall picture of the system. At the river end, the system is broken into two parts. At the bottom of the river, bolted to an existing stick gauge (or some other convienient location) is a differential pressure sensor. This sensor measures the difference in pressure between the athmosphere and the bottom of the river. To make this differential measureme Read more:River
, System
Video Amplifier with Sync Stripper and DC Restore (EL8102) 2008-05-20 02:38:59 IntroductionThe circuit in Figure 1 transmits 200MHz (-3dB bandwidth) video signals while stripping off the sync pulse and performing DC restoration. It is configured for a typical video cable driver application driving a double-terminated 75Ω load, where the EL8102 (IC3) is configured for a gain of +2 to ensure unity gain throughout.Sync StrippingIn component video systems it is frequently nece Read more:Amplifier
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, Restore
Wideband UHF TV Signal Amplifier 2008-05-20 02:26:14 This UHF wideband signal amplifier has a total gain of 10 to 15 dB in the 400 - 850 MHz domain frequency so it can be used where the tv signal is weak. For UHF TV signal amplifier to work correctly, you need to cut the components pins as short as possible. C1, C2, C6, C7 are SMD type (surface mounted). This antenna tv amplifier or uhf wideband amplifier need to be build inside of a metal box an Read more:Amplifier
, Wideband
Audio Millivoltmeter as Audio Test Equipment 2008-05-13 16:04:59 When performing any tests on an audio system, some form of measuring device is essential. Digital multimeters are not useful, since they will not give the true picture of what is happening, and most have a fairly limited frequency range. An oscilloscope equipment is the ideal tool for audio test, but not all hobbyists can afford the outlay for a scope, and would find justifying the not inconsider Read more:Audio
, Equipment
Water Activated Alarm 2008-05-08 02:10:37 The Electronic circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. As the probes get wet, a small current flows between base and emitter and the transistor switches on. A larger current flows in the collector electronic circuit enabling the 555 osillator to sound.A
Radio Wave Alarm 2008-05-07 03:55:40 This alarm circuit is sure to have the police beating a path to your door - however, it has the added advantage of alerting you to their presence even before their footsteps fall on the doormat.The circuit transmits on Medium Wave (this is the small problem with the police). IC1a, together with a sensor (try a 20cm x 20cm sheet of tin foil) oscillates at just over 1MHz. This is modulated by an aud Read more:Radio
Almost Ultrasonic Motion Sensor 2008-05-07 03:51:56 This sensor uses the sound generator in the RCX to make a 15kHz audio tone, which is almost ultrasonic. The tone is received with circuitry similar to my Sound sensor. The output of a crystal microphone MIC is amplified and then only the very high frequencies are further amplified (see plot). This signal is enveloped detected with a diode D1 and capacitor C1. The voltage on the capacitor will equa Read more:Almost
, Motion
, Sensor
Audio Video Transmitter 2008-05-04 11:07:47 Small Circuit to send your Audio
Video from DVD player or satellite receiver to VHF RF signal. This circuit connected to TV RF input via 75 ohm cable or telescopic antenna. Don’t use this circuit for more power without filter and use antenna only to transmit. Frequency range on vhf band about 50-250 MHz.You can change the transistor for transmitting on UHF band. Keep the components lead shortly. Read more:Transmitter
Telemetry Transmitter System 2008-05-04 10:57:16 This project is a multi sensor telemetry system with Frequency Division Multiplexing (FDM).This Telemetry System
acquires several different sensor inputs, FM modulates each level by manipulating Direct Digital Synthesis increment values, transmits the resulting signal on a commercial FM radio band, and receives and decodes the original sensor levels.Wireless Telemetry System - LinkMiniature Telem Read more:Transmitter
FM Stereo Multiplexer Overview 2008-05-04 10:47:03 The diagram below shows an examples of the theoritical display that one could see on spectrum analyzerconnected to output of a stereo encoder. The L+R section is simply the mono signal generated from the stereo input after filtering with a 15 KHz low pass filter. The 19 KHz pilot must be generated by encoder. The L-R (difference) signal must be amplitude modulated onto a suppressed 38 KHz carried. Read more:Stereo
, Overview
Make Printed Circuit Boards 2008-05-01 14:26:31 Creating Printed Circuit
Boards (PCBs) is easy and fun for the whole family! But read the disclaimer -- heat and corrosive chemicals are dangerous. After you've prototyped and tested your circuit design, creating a PCB will provide a sturdy and reliable backbone for your circuit and will give your project a professional finished quality. Using PCBs can even help reduce the time you spend building
What's Electronic circuit 2008-04-30 06:56:11 An electronic circuit is an electrical circuit that connects active and passive electronic components such as resistors, capacitors, microprocessors, transistors or vacuum tubes.The electronic circuits are typically built using a printed circuit board (PCB) that is used to mechanically support and electrically connect electronic components.The continued miniaturization and savings in power allows Read more:Electronic
Privacy Policy 2008-04-30 06:32:29 Privacy Policy
for Free Electronic Circuit (FEC)If you require any more information or have any questions about our privacy policy, please feel free to contact us by email at fecircuit@telkom.net.Log FilesLike many other Web sites, FEC makes use of log files. The information inside the log files includes internet protocol ( IP ) addresses, type of browser, Internet Service Provider ( ISP ), date/t Read more:Privacy
, Privacy Policy
Very Low Power UHF RF Transmitter with CC1050 Chip 2008-04-30 06:30:58 CC1050 is RF Integrated Circuit UHF transmitter designed for very low power and very low voltage wireless applications. The circuit is mainly intended for the ISM Industrial, Scientific and Medical) and SRD (Short Range Device) frequency bands at 315, 433, 868 and 915 MHz, but can easily be programmed for operation at other frequencies in the 300-1000 MHz range.The main operating parameters of C Read more:Transmitter
Create an Electronic Circuit in Minutes 2008-04-30 00:28:53 If you want to create a Printed Circuit
Board (PCB), You need circuit software for drawing the Circuit design in order to translate the circuit boards prototype into a schematic diagram. Start with the exact template you need—not just a blank screen. Then easily customize to fit your needs with thousands of ready-made symbols you can stamp directly onto your image.Create electrical and electroni Read more:Electronic
UHF TV RF amplifier 5W 2008-07-12 03:46:02 This electronic circuit is a RF Power Amplifier for driving small UHF TV transmitters. Its gain is 7dB and can amplify a signal between 450-800 MHz. You can drive the circuit with 1 to 1,5 Watts signal. Better use double layer PCB with the second layer connected to earth. Use a stabilized power supply 25 volts and at least 5Amps.The transistor case is the SOT-122A and be careful because the transi
Telephone Hybrid Circuit 2008-07-12 03:34:56 This electronic circuit is a telephone hybrid. It is intended to be used to create an easy connection beetween telephone line and studio equipment. Connect the two wires of the telephone line to the tip and ground of the line input and connect the telephone itself to the phone output on the tip and ground only.Now the hybrid is interfaced (fully balanced) between your telephone and its connection Read more:Hybrid
, Circuit
Oxygen Sensor Simulator 2008-07-13 18:05:35 This electronic circuit is an oxygen sensor simulator that built on a protoboard. Note the cigarette lighter plug used for power source. The adjustment knob is at the left, and the switch is on the right. The red indicator LED is in the middle. Only use red, because the voltage drop of the LED is part of the circuit!The schematic diagram for the simulator. Closing the switch engages the simulator. Read more:Oxygen
, Sensor
, Simulator
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