New Circuits Page 149
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Many households are still graced by tube-type television sets. If you want to connect one of these large tellies to your stereo system to improve the soun....
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This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more....
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The first time you sign into developerWorks, a profile is created for you. Select information in your profile (name, country/region, and company) is displayed to the public and will accompany any content you post. You may update your IBM account at any time.....
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This MK484 AM radio circuit provides a complete solution including : RF amplifier, Detection and AGC circuit (automatic gain control ), which requires only a few external components to give a high quality AM Tuner. The circuit has an input impedance of....
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A voltage to frequency converter with a control range of 1:1000 can be easily constructed by using the IC TSC9402. The given component values in the circuit produces a conversion factor of 1kHz/1V. The input voltages from 10 mV up to 10 V are converted to....
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This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and....
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Using an inductor inline and a decoupling capacitor it`s creating essentially a series LC circuit. Now one of the properties of LC circuits is they have a resonant frequency. I modeled a LC circuit with an attached purely resistive load to simulate what the....
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Originally posted by Justinasia What is the likely cost of the Aleph Ono, all the parts I mean? Anyone know? If it is the same as the Pearl but better ....
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The following shows over a 1993 VW Passat electrical schematic. Features: Vehicle content, electrical wiring schematic. Component: Console switches, electric Windows, ABS control unit and ABS hydraulic unit, engine control module, automatic control unit,....
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The ratio R1/R2 sets the amplitude of the triangle wave, as referenced to the square-wave output. For both waveforms, the frequency of oscillation can be determined by the equation: fo= 1/4R3C1 * R2/R1 ..
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As part of the DBS 800 System, this Audio signalling processor will provide an inband Tone signalling facility for PMR Radio systems. Signalling systems supported include Selcall (CCIR, ZVEI I, II and III, EEA), 2-Tone Selcall and Dual Tone Multi-Frequency....
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7809 is a voltage regulator integrated circuit(IC) which is widely used in electronic circuits. Voltage regulator circuit can be manually built using parts available in the market but it will take a lot of time to assemble those parts on a PCB. Secondly, the....
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Four appearance drive signals for two appearance bipolar and four appearance unipolar footfall motors in microcomputer-controlled appliance is calmly implemented application L29 Stepper Motor Controller IC. We can drive the motor in bisected step, accustomed....
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My particular favourite was the MC145152-2 that could be programmed with DIP switches, a diode matrix, or even a pair of EPROM look-up tables. But sadly, those days are over. The MC145152-2 costs about US$30, if you can find a supplier. Today we need to use....
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The Theramidi is a new musical device, based on the Theremin, which produces a MIDI signal relative to the movement of objects to or away from it. The MIDI output is controlled by the intensity of light falling onto two Light Dependent Resistors (LDRs). One....
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This is a LM338 based power supply which is not complicated and easy to build. I am using the supply for a long time, have no problem yet. Only current adjust is missing but I overcome this situation by using an LCD panel ampermeter. There is no PCB for the....
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For a hobby project I have bread boarded, I am considering using a pair detectors that operate as a single use physical barrier. When hit by a projectile, a trace is broken allowing +5VDC to to trigger a flipflop that is part of my gate logic for a....
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The LM2889 is designed to Interface Audio and Video sig- nals to the Antenna terminals of a TV receiver. It consists of a sound subcarrier Oscillator and FM Modulator Video clamp, and RF Oscillators and Modulators for two low-VHF channels. The LM2889 allows....
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The robot consists of modules controlled by a main controller. The main microcontroller is an 18-pin, 8-bit, PIC16F84 Flash microcontroller operating at 4MHz. The microcontroller is programmed in assembly language. The controller is connected via I/O pins to....
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Electric single-girder cranes is also known as electric hoist. It is commonly used in small factories lifting handling equipment. Usually it is always used with drag line switching noytoperation, which is not very convenient. The circuit is composed of radio....
-
It relies on the smoke that is produced in the event of a fire and passes between a bulb and an LDR, the amount of light falling on the LDR decreases. This type of circuit is called optical smoke detector. Do not use it as a home smoke detector it`s jus for....
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The Arduino Internet Gizmo consists of an Arduino, a RFID card reader, a bunch of LEDs and other components mounted in a recycled PC power supply case....
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The chips include an ATmega88 as the main controller, an AD9280 ADC, an LM6134 high-speed quad op-amp, an LM1881 video sync separator, a 74HC4066 as a simple analog switch, and an RS-232-level converter. LM1881 Video sync separator extracts timing....
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Here is a simple tester for checking the basic operations of an infrared remote control unit. It is low-cost and easy to construct. The tester is built around infrared receiver module TSOP1738. Operation of the remote control is acknowledged by a tone from....
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These two tank circuits seem to expand that operating spectrum. Maybe The information sheet that came with the bug states that When both circuit stages are oscillating at the same frequency, the power output will be at a maximum. This must mean that if the....
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An obstacle avoiding robot is an intelligent device, which can automatically sense and overcome obstacles on its path. It is developed without micro-controller in order to eliminate critical circuits, difficult programming etc. All you want to do is to just....
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This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The....
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The Slave Flash Trigger is switched on/off by pressing the push button. When switched on, one to three flickers of the indicator lamp signalizes the programmed mode. One flicker determines that the flash will be fired at each flash. Two flickers indicate....
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Here is the circuit diagram of remote controlled appliance switch circuit. The main parts of this circuit are IC1 (NE 555), IC2 (CD 4017)...
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This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
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You can easily build an infrared illuminator yourself at home with a little effort. You should have basic electronics knowledge on order to attempt this simple IR illuminator project. There is nothing difficult in this circuit. I have used 68Ohm and 1 Watt....
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Discrete Class AB Transistor Audio Power Amplifier Circuit Diagram This is a class AB transistor power amplifier. It is a simple amplifier to...
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Here is a solar powered Flasher to scare away the nocturnal animals like bats and cats from the farm yard or premises of the house. The brilliant multicol....
-
Here is a simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i. e. at low frequency, period is measured for a complete wave....
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In most countries it is now mandatory or at least recommended to have a rear fog light on a trailer with the additional requirement that, when the trailer is coupled to the car, the rear fog light of the towing car has to be off. The circuit shown here is....
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This is a design circuit for tachometer circuit based on the LM2907 IC can be used to provide zero crossing datum to a digital system. At each zero crossing of the input signal the charge pump changes the state of capacitor C1 and provides a one-shot pulse....
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Its a high quality FM receiver circuit based on IC CXA1019. CXA1019 is a monolithic silicon bipolar radio FM / AM receiver IC for Sony. Built in circuitry within the CXA1019 includes RF amplifier, mixer, oscillator, amplifier, quadrature detection circuit,....
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Schematic and description to make fm transmitter. It is a simple fm transmitter circuit with minimum components but it has a long range. ....
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How the circuit worksh1. Your title here The circuit comprises a non inverting amplifier with a final output buffer stage or voltage follower for impedance matchin....
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Hi I am new to electronics and have some questions about reading circuit diagrams. When I look at circuit diagrams I don`t know which order the wires, ....
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This circuit inverter converts 12V DC battery to AC 22oV as the replacement of home energy. The inverter can be used for small electronic devices such as lamps, radio, phone charger, disc player, etc. The inverter circuit is a central component, the CMOS....
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The P5 design uses only eight 74HC/AC240 chips which are all octal inverting buffers. Each 74HC/AC240 chip has two groups of four inverters each controlled by a tri-state enable pin (pin 1 and 19). The 74AC240 chips (U1-U5) are used as H-bridge style motor....
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This circuit is selective for the tuning adjustment between two closely spaced tones audio. The frequency is dependent on the selective value capacitors and resistors in the feedback circuit between the collector and base of Q1. With the values shown, the....
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Even if a large number of album titles once available on vinyl are now, little by little, being proposed as CDs, not all are available and far from it. You may have treasures in your collection that you would like to burn on CDs. First, preserving a CD is....
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It can set delay time according to the voltage Us and resistor R. In the circuit, S1 is the the discharge switch of capacitor C. When the switch S1 is closed, the stored charge on C will be released through S1 to ensure the accuracy of the delay time the....
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Crap, the sensor on my clone is low resistance and the replacement heater is 45 Ohms. Is there anywhere you can buy the clone heaters or modify the station to accomodate the genuine heater Going home for the holiday week but the circuit inside last I looked....
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This improved infrared detector is specifically intended for use with commercial IR remote control handsets. This little circuit is useful for quick go/no-....
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This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it is a modern substitute for the old sandglass. Useful also for....
-
To avoid hum and interference in our high quality DAC we need to galvanically isolate him from a signal source and break potential unwanted ground loop. One possibility is to isolate DAC on input of the S/PDIF decoder with pulse transformer or connect him....
-
ATA6823 is designed specifically for automotive applications that require high-power motors. It provides four high-current Gate driver outputs capable of driving a wide range of n-channel Power MOSFETs in a full-bridge configuration. A fully integrated....
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Although not a new device, the LM317 is still a high-performance regulator. Its output voltage is essentially immune to fluctuations in load, supply voltage and temperature and this makes it ideal as the central element in a float charger for NiMH cells.....
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The lithium-ion rechargeable battery charger introduced in the example charges in constant voltage and current way.It is suitable for 3.6V lithium ion battery charging which are used in kinds of mobile phones. Circuit`s Work Principle The lithium-ion....
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This voltage regulator circuit gives a stable 5V output from unregulated inputs (more than 5V). The stability of the output voltage is good enough, only change...
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Oscillating circuit (coil) are made on a ferrite bar. If you wish to listen long waves winding "1-2" has 135 turns and 3-4 has 20 turns. If you wish to receive medium wave winding "1-2" has 75 turns, and "3-4" has 7 turns (wire used must be CuEm 0. 15mm). In....
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The working of Negative Resistance Oscillators,Types like Dynatron,Tunnel diode oscillator, their characteristics and circuit diagram is explained....
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The plan is to have some plant sensing working for a groworld installation we are doing at Camp Pixelache so I`ve made the circuitry a little more durable with a bit of soldering: Here`s the circuit diagram the values of components are influenced by what I....
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The LA4165M Recording-Playback IC combines the functions required to design the recording and playback systems and Motor Control circuits for micro- or standard-cassette tape recorders into a single chip. Functions provided include Automatic Audio input....
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A very simple Field Strength Meter composed of a small antenna, a detector diode, a resistor, capacitor and a Micro Ammeter. Assuming that this simple circuit would be sensitive enough to detect the HF field, providing we keep it close enough to the....
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He only contributes with 3. 2nV/ HZ of noise tension and 0. 45pA/ HZ of current noise to the circuit. To minimize the noise of other sources, R3 it is configured for 100 ©. That generates tension of noise additional of only 1. 3nV/ HZ. R1, R2, c1, and c @....
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For any robot to perform the tasks it is assigned, a controller is required. The controller may be mechanical, electrical, electronic or a combination of these. It is the brain of the entire system and gives the robot its intelligence. Additional....
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Another method of testing the received signal strength on a Symphony based wireless network is with a homebrew signal meter. The National LMX2240 Intermediate Frequency Receiver has a certain pin called "RSSI Out". RSSI stands for relative signal strength....
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This circuit is a general-purpose 10-W audio amplifier for moderate-power PA or modulator use in an AM transmitter. With higher voltages and a change in bias resistors, up to 30 W can be obtained. The Output Stage Amplifier using transistor 2N3055 and MJE2055...
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This is a "quick-and-dirty" page that I set up to describe the T1-rate modem that I designed several years ago (in 1993, actually. ) Let me point out that unless you are going to use this on wires, this modem is absolutely useless to anyone other than....
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For all of the following tests, we used a high quality signal generator from BlackStar. The PicoScope trace below shows a pure 1 kHz tone from the signal generator. Please note: although the screenshots below show the THD, SFDR and SINAD measurements in a....
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This is a good Electrical & Electronics mini project report on "Remote Controlled Fan Regulator" and submitted in accordance with the curriculum requirements for sixth semester of the degree course in Bachelor of Technology in the branch of Electrical and....
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With the aid of this circuit it is possible to listen, using a portable VHF FM radio, to listen to stations that transmit only your local cable network. Bo....
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DC 12V Battery Charger Circuit Diagram. This circuit is a high performance charger for gelled electrolyte lead-acid batteries....
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Microcontrollers family AT89C has parallel programming interface of flash memory. In order to write information we need to supply programming voltage 12V and for controlling almost all pins of ports are used. This is why parallel programming is done in....
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Electronics Tutorial about Passive High Pass Filter Circuit including Passive RC High Pass Filter First Order Frequency Response, Bode Plot and Construction....
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This is powerful siren circuit diagram. You can get lots of supports from this circuit because you can use this circuit for your alarm circuit then you will be able to get maximum results...
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The LM1875 amplifier delivers 20 watts into a 4 © or 8 © load on ±25V supplies. Using an 8 © load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload....
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Designing a simple current limiter, which charges a large (4. 7mF) capacitor with a charge current of (roughly) 500mA from a supply voltage from about 10-20V - see the below circuit. My dilemma is that I already have a bunch of MMBT2222A and it would be nice....
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The oscillator model I talked about in the introduction to oscillators was as simple as it gets - capacitor + inductor. So I wanted to try to make my own oscillator. In a search for how to make an oscillator I got a website with a few different kinds. They....
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Blinks 2 LEDs timely in sequence. Will somebody explain its working I know that capacitor will charge and during the charging the LED will off and whenthey discharge they will on the LED. But why transistor are there..
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I`ve been doing some CW contesting with my K2 and N3FJP`s Logging Software and since I now have this modern rig with computer control and everything I wanted to connect it up to my old Thinkpad and use the serial port for rig control and the parallel port....
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I am a mechanical engineering student, and for a part of my design project I wish to use a timer as so the motor switches off about 40-50 seconds after activation. The 555 timer chip is a rectangle with a indented o on the top, i assumed this was equivalent....
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This article is copied from replica sites to here in order to have a local and long living copy at hand. It seems like had radical rework done to it sometime in 2006 and original copy of this article disappeared. When discussing SSB transceivers, the first....
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The circuit uses AC mains voltage and otherhigh voltages that can cause injury or death. The 125 is a basic heterodyne configuration, in which the outputs of two similar radio-frequency Colpitts oscillators are fed to a mixer, producing their difference....
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The artwork style of the opamp and of the meter face both suggest that is is an ACC design and is from an old issue of ACC Notes. I have credited it as such. I scanned the second image and wrote the text below from scratch. If anybody can locate the original....
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This is a continuation of the article An AVR microcontroller based Ethernet device. The hardware is still the same (ENC28J60 + atmega88). The software is now updated to provide also a web-server. That is: instead of using a command line application and send....
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The serial version of the DSC circuit described in these pages is readily adapted to use with a USB-serial conversion cable. In fact, FTDI makes the TTL-232R-5V cable that converts TTL-level serial data coming straight from the PIC into USB for the PC. Using....
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Many areas of scientific research and industrial production require vacuum conditions - where most (or as much as possible) of the air has been removed leaving little or nothing behind. While written specifically for the needs of home-built gas lasers, much....
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Here the wailing alarm circuit diagram: Component parts List: R1,R5 4.7KR2 47KR3 10KR4 100KRx *see text C1,C4 100uF/25V, electrolyticC2,C3 0.01uF (10nF),....
Many households are still graced by tube-type television sets. If you want to connect one of these large tellies to your stereo system to improve the soun....
This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more....
The first time you sign into developerWorks, a profile is created for you. Select information in your profile (name, country/region, and company) is displayed to the public and will accompany any content you post. You may update your IBM account at any time.....
This MK484 AM radio circuit provides a complete solution including : RF amplifier, Detection and AGC circuit (automatic gain control ), which requires only a few external components to give a high quality AM Tuner. The circuit has an input impedance of....
A voltage to frequency converter with a control range of 1:1000 can be easily constructed by using the IC TSC9402. The given component values in the circuit produces a conversion factor of 1kHz/1V. The input voltages from 10 mV up to 10 V are converted to....
This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and....
Using an inductor inline and a decoupling capacitor it`s creating essentially a series LC circuit. Now one of the properties of LC circuits is they have a resonant frequency. I modeled a LC circuit with an attached purely resistive load to simulate what the....
Originally posted by Justinasia What is the likely cost of the Aleph Ono, all the parts I mean? Anyone know? If it is the same as the Pearl but better ....
The following shows over a 1993 VW Passat electrical schematic. Features: Vehicle content, electrical wiring schematic. Component: Console switches, electric Windows, ABS control unit and ABS hydraulic unit, engine control module, automatic control unit,....
The ratio R1/R2 sets the amplitude of the triangle wave, as referenced to the square-wave output. For both waveforms, the frequency of oscillation can be determined by the equation: fo= 1/4R3C1 * R2/R1 ..
As part of the DBS 800 System, this Audio signalling processor will provide an inband Tone signalling facility for PMR Radio systems. Signalling systems supported include Selcall (CCIR, ZVEI I, II and III, EEA), 2-Tone Selcall and Dual Tone Multi-Frequency....
7809 is a voltage regulator integrated circuit(IC) which is widely used in electronic circuits. Voltage regulator circuit can be manually built using parts available in the market but it will take a lot of time to assemble those parts on a PCB. Secondly, the....
Four appearance drive signals for two appearance bipolar and four appearance unipolar footfall motors in microcomputer-controlled appliance is calmly implemented application L29 Stepper Motor Controller IC. We can drive the motor in bisected step, accustomed....
My particular favourite was the MC145152-2 that could be programmed with DIP switches, a diode matrix, or even a pair of EPROM look-up tables. But sadly, those days are over. The MC145152-2 costs about US$30, if you can find a supplier. Today we need to use....
The Theramidi is a new musical device, based on the Theremin, which produces a MIDI signal relative to the movement of objects to or away from it. The MIDI output is controlled by the intensity of light falling onto two Light Dependent Resistors (LDRs). One....
This is a LM338 based power supply which is not complicated and easy to build. I am using the supply for a long time, have no problem yet. Only current adjust is missing but I overcome this situation by using an LCD panel ampermeter. There is no PCB for the....
For a hobby project I have bread boarded, I am considering using a pair detectors that operate as a single use physical barrier. When hit by a projectile, a trace is broken allowing +5VDC to to trigger a flipflop that is part of my gate logic for a....
The LM2889 is designed to Interface Audio and Video sig- nals to the Antenna terminals of a TV receiver. It consists of a sound subcarrier Oscillator and FM Modulator Video clamp, and RF Oscillators and Modulators for two low-VHF channels. The LM2889 allows....
The robot consists of modules controlled by a main controller. The main microcontroller is an 18-pin, 8-bit, PIC16F84 Flash microcontroller operating at 4MHz. The microcontroller is programmed in assembly language. The controller is connected via I/O pins to....
Electric single-girder cranes is also known as electric hoist. It is commonly used in small factories lifting handling equipment. Usually it is always used with drag line switching noytoperation, which is not very convenient. The circuit is composed of radio....
It relies on the smoke that is produced in the event of a fire and passes between a bulb and an LDR, the amount of light falling on the LDR decreases. This type of circuit is called optical smoke detector. Do not use it as a home smoke detector it`s jus for....
The Arduino Internet Gizmo consists of an Arduino, a RFID card reader, a bunch of LEDs and other components mounted in a recycled PC power supply case....
The chips include an ATmega88 as the main controller, an AD9280 ADC, an LM6134 high-speed quad op-amp, an LM1881 video sync separator, a 74HC4066 as a simple analog switch, and an RS-232-level converter. LM1881 Video sync separator extracts timing....
Here is a simple tester for checking the basic operations of an infrared remote control unit. It is low-cost and easy to construct. The tester is built around infrared receiver module TSOP1738. Operation of the remote control is acknowledged by a tone from....
These two tank circuits seem to expand that operating spectrum. Maybe The information sheet that came with the bug states that When both circuit stages are oscillating at the same frequency, the power output will be at a maximum. This must mean that if the....
An obstacle avoiding robot is an intelligent device, which can automatically sense and overcome obstacles on its path. It is developed without micro-controller in order to eliminate critical circuits, difficult programming etc. All you want to do is to just....
This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The....
The Slave Flash Trigger is switched on/off by pressing the push button. When switched on, one to three flickers of the indicator lamp signalizes the programmed mode. One flicker determines that the flash will be fired at each flash. Two flickers indicate....
Here is the circuit diagram of remote controlled appliance switch circuit. The main parts of this circuit are IC1 (NE 555), IC2 (CD 4017)...
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
You can easily build an infrared illuminator yourself at home with a little effort. You should have basic electronics knowledge on order to attempt this simple IR illuminator project. There is nothing difficult in this circuit. I have used 68Ohm and 1 Watt....
Discrete Class AB Transistor Audio Power Amplifier Circuit Diagram This is a class AB transistor power amplifier. It is a simple amplifier to...
Here is a solar powered Flasher to scare away the nocturnal animals like bats and cats from the farm yard or premises of the house. The brilliant multicol....
Here is a simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i. e. at low frequency, period is measured for a complete wave....
In most countries it is now mandatory or at least recommended to have a rear fog light on a trailer with the additional requirement that, when the trailer is coupled to the car, the rear fog light of the towing car has to be off. The circuit shown here is....
This is a design circuit for tachometer circuit based on the LM2907 IC can be used to provide zero crossing datum to a digital system. At each zero crossing of the input signal the charge pump changes the state of capacitor C1 and provides a one-shot pulse....
Its a high quality FM receiver circuit based on IC CXA1019. CXA1019 is a monolithic silicon bipolar radio FM / AM receiver IC for Sony. Built in circuitry within the CXA1019 includes RF amplifier, mixer, oscillator, amplifier, quadrature detection circuit,....
Schematic and description to make fm transmitter. It is a simple fm transmitter circuit with minimum components but it has a long range. ....
How the circuit worksh1. Your title here The circuit comprises a non inverting amplifier with a final output buffer stage or voltage follower for impedance matchin....
Hi I am new to electronics and have some questions about reading circuit diagrams. When I look at circuit diagrams I don`t know which order the wires, ....
This circuit inverter converts 12V DC battery to AC 22oV as the replacement of home energy. The inverter can be used for small electronic devices such as lamps, radio, phone charger, disc player, etc. The inverter circuit is a central component, the CMOS....
The P5 design uses only eight 74HC/AC240 chips which are all octal inverting buffers. Each 74HC/AC240 chip has two groups of four inverters each controlled by a tri-state enable pin (pin 1 and 19). The 74AC240 chips (U1-U5) are used as H-bridge style motor....
This circuit is selective for the tuning adjustment between two closely spaced tones audio. The frequency is dependent on the selective value capacitors and resistors in the feedback circuit between the collector and base of Q1. With the values shown, the....
Even if a large number of album titles once available on vinyl are now, little by little, being proposed as CDs, not all are available and far from it. You may have treasures in your collection that you would like to burn on CDs. First, preserving a CD is....
It can set delay time according to the voltage Us and resistor R. In the circuit, S1 is the the discharge switch of capacitor C. When the switch S1 is closed, the stored charge on C will be released through S1 to ensure the accuracy of the delay time the....
Crap, the sensor on my clone is low resistance and the replacement heater is 45 Ohms. Is there anywhere you can buy the clone heaters or modify the station to accomodate the genuine heater Going home for the holiday week but the circuit inside last I looked....
This improved infrared detector is specifically intended for use with commercial IR remote control handsets. This little circuit is useful for quick go/no-....
This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it is a modern substitute for the old sandglass. Useful also for....
To avoid hum and interference in our high quality DAC we need to galvanically isolate him from a signal source and break potential unwanted ground loop. One possibility is to isolate DAC on input of the S/PDIF decoder with pulse transformer or connect him....
ATA6823 is designed specifically for automotive applications that require high-power motors. It provides four high-current Gate driver outputs capable of driving a wide range of n-channel Power MOSFETs in a full-bridge configuration. A fully integrated....
Although not a new device, the LM317 is still a high-performance regulator. Its output voltage is essentially immune to fluctuations in load, supply voltage and temperature and this makes it ideal as the central element in a float charger for NiMH cells.....
The lithium-ion rechargeable battery charger introduced in the example charges in constant voltage and current way.It is suitable for 3.6V lithium ion battery charging which are used in kinds of mobile phones. Circuit`s Work Principle The lithium-ion....
This voltage regulator circuit gives a stable 5V output from unregulated inputs (more than 5V). The stability of the output voltage is good enough, only change...
Oscillating circuit (coil) are made on a ferrite bar. If you wish to listen long waves winding "1-2" has 135 turns and 3-4 has 20 turns. If you wish to receive medium wave winding "1-2" has 75 turns, and "3-4" has 7 turns (wire used must be CuEm 0. 15mm). In....
The working of Negative Resistance Oscillators,Types like Dynatron,Tunnel diode oscillator, their characteristics and circuit diagram is explained....
The plan is to have some plant sensing working for a groworld installation we are doing at Camp Pixelache so I`ve made the circuitry a little more durable with a bit of soldering: Here`s the circuit diagram the values of components are influenced by what I....
The LA4165M Recording-Playback IC combines the functions required to design the recording and playback systems and Motor Control circuits for micro- or standard-cassette tape recorders into a single chip. Functions provided include Automatic Audio input....
A very simple Field Strength Meter composed of a small antenna, a detector diode, a resistor, capacitor and a Micro Ammeter. Assuming that this simple circuit would be sensitive enough to detect the HF field, providing we keep it close enough to the....
He only contributes with 3. 2nV/ HZ of noise tension and 0. 45pA/ HZ of current noise to the circuit. To minimize the noise of other sources, R3 it is configured for 100 ©. That generates tension of noise additional of only 1. 3nV/ HZ. R1, R2, c1, and c @....
For any robot to perform the tasks it is assigned, a controller is required. The controller may be mechanical, electrical, electronic or a combination of these. It is the brain of the entire system and gives the robot its intelligence. Additional....
Another method of testing the received signal strength on a Symphony based wireless network is with a homebrew signal meter. The National LMX2240 Intermediate Frequency Receiver has a certain pin called "RSSI Out". RSSI stands for relative signal strength....
This circuit is a general-purpose 10-W audio amplifier for moderate-power PA or modulator use in an AM transmitter. With higher voltages and a change in bias resistors, up to 30 W can be obtained. The Output Stage Amplifier using transistor 2N3055 and MJE2055...
This is a "quick-and-dirty" page that I set up to describe the T1-rate modem that I designed several years ago (in 1993, actually. ) Let me point out that unless you are going to use this on wires, this modem is absolutely useless to anyone other than....
For all of the following tests, we used a high quality signal generator from BlackStar. The PicoScope trace below shows a pure 1 kHz tone from the signal generator. Please note: although the screenshots below show the THD, SFDR and SINAD measurements in a....
This is a good Electrical & Electronics mini project report on "Remote Controlled Fan Regulator" and submitted in accordance with the curriculum requirements for sixth semester of the degree course in Bachelor of Technology in the branch of Electrical and....
With the aid of this circuit it is possible to listen, using a portable VHF FM radio, to listen to stations that transmit only your local cable network. Bo....
DC 12V Battery Charger Circuit Diagram. This circuit is a high performance charger for gelled electrolyte lead-acid batteries....
Microcontrollers family AT89C has parallel programming interface of flash memory. In order to write information we need to supply programming voltage 12V and for controlling almost all pins of ports are used. This is why parallel programming is done in....
Electronics Tutorial about Passive High Pass Filter Circuit including Passive RC High Pass Filter First Order Frequency Response, Bode Plot and Construction....
This is powerful siren circuit diagram. You can get lots of supports from this circuit because you can use this circuit for your alarm circuit then you will be able to get maximum results...
The LM1875 amplifier delivers 20 watts into a 4 © or 8 © load on ±25V supplies. Using an 8 © load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload....
Designing a simple current limiter, which charges a large (4. 7mF) capacitor with a charge current of (roughly) 500mA from a supply voltage from about 10-20V - see the below circuit. My dilemma is that I already have a bunch of MMBT2222A and it would be nice....
The oscillator model I talked about in the introduction to oscillators was as simple as it gets - capacitor + inductor. So I wanted to try to make my own oscillator. In a search for how to make an oscillator I got a website with a few different kinds. They....
Blinks 2 LEDs timely in sequence. Will somebody explain its working I know that capacitor will charge and during the charging the LED will off and whenthey discharge they will on the LED. But why transistor are there..
I`ve been doing some CW contesting with my K2 and N3FJP`s Logging Software and since I now have this modern rig with computer control and everything I wanted to connect it up to my old Thinkpad and use the serial port for rig control and the parallel port....
I am a mechanical engineering student, and for a part of my design project I wish to use a timer as so the motor switches off about 40-50 seconds after activation. The 555 timer chip is a rectangle with a indented o on the top, i assumed this was equivalent....
This article is copied from replica sites to here in order to have a local and long living copy at hand. It seems like had radical rework done to it sometime in 2006 and original copy of this article disappeared. When discussing SSB transceivers, the first....
The circuit uses AC mains voltage and otherhigh voltages that can cause injury or death. The 125 is a basic heterodyne configuration, in which the outputs of two similar radio-frequency Colpitts oscillators are fed to a mixer, producing their difference....
The artwork style of the opamp and of the meter face both suggest that is is an ACC design and is from an old issue of ACC Notes. I have credited it as such. I scanned the second image and wrote the text below from scratch. If anybody can locate the original....
This is a continuation of the article An AVR microcontroller based Ethernet device. The hardware is still the same (ENC28J60 + atmega88). The software is now updated to provide also a web-server. That is: instead of using a command line application and send....
The serial version of the DSC circuit described in these pages is readily adapted to use with a USB-serial conversion cable. In fact, FTDI makes the TTL-232R-5V cable that converts TTL-level serial data coming straight from the PIC into USB for the PC. Using....
Many areas of scientific research and industrial production require vacuum conditions - where most (or as much as possible) of the air has been removed leaving little or nothing behind. While written specifically for the needs of home-built gas lasers, much....
Here the wailing alarm circuit diagram: Component parts List: R1,R5 4.7KR2 47KR3 10KR4 100KRx *see text C1,C4 100uF/25V, electrolyticC2,C3 0.01uF (10nF),....
