New Circuits Page 180
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In the ADM666A application note, you can find detailed explanation about this low cost battery charger circuit such as Maximum output voltage, Charge termination voltage calculation, monitoring the battery voltage level, maximizing the circuit efficiency,....
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The circuit of the transmitter is shown in Figure 1, and as you can see it is quite simple. The first stage is the oscillator, and is tuned with the variable capacitor. Select an unused frequency, and carefully adjust C3 until the background noise stops (you....
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Designed in the fifties, this pre-amp remained in production until 1975. And, it remains fully functional and serviceable today. This discussion is designed to help owners do some basic troubleshooting and, we`ll get into some depth of circuit operation as....
-
Timer start-pulse generator is fast series-transistor coincidence circuit. Slop-gate generator is one-shot mvbr that prevents 1N97A diode from passing blocking oscillator negative sync pulse until mvbr fires. Used to count number of sing-around cycles and....
-
The ADUC816 is a complete smart transducer front-end, inte- grating two high-resolution sigma-delta ADCs an 8-bit MCU, and program/data Flash EE Memory on a single chip. This low power device accepts low-level signals directly from a transducer. The two....
-
-
One is in good shape, made in 1979, and capable of producing sine, triangle and square waveforms. This one is retained and used as main function generator for testing purposes at my main office location. Other three were not working, or working sporadically.....
-
The circuit is formed by light metering circuit and flash circuit,just as shown in picture.It is suitable for POPTICS (a popular integrated camera), Franka X-500, WIZEN-860S and so on.It consists of the following circuit:(1)VT1,VT2,light metering device RG....
-
This application note describes a Digital Blood Pressure Meter concept which uses an integrated Pressure Sensor Analog signal-conditioning circuitry, Microcontroller hardware/software and a liquid crystal Display The sensing system reads the cuff pressure....
-
The UTC H1277 is a semiconducting integrated Hall Effect Sensor IC. It is just like all the hall sensitive Hall Effect Sensors designed to work in the situations which the accurate track is extremely small and the changes in magnetic flux density-changes are....
-
Another method of using opamps to regulate a power supply is shown below. The power transformer requires an additional winding to supply the op-amps with a bipolar voltage (+/- 8 volts), and the negative voltage is also used to generate a reference voltage....
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-
PIC development/testing board Here`s a PCB design for a bare bones PIC16F877 development board. All you need is a 4mhz crystal, two 22pf caps, one 4.7k res....
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-
This little PC Watcher circuit will help you to prevent unauthorised access to your personal computer. After construction on a small piece of veroborad, en....
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The total dollars count for all parts is much smaller that the cost of an heavy duty DPDT foot switch. As seen on the previous page suggested electronic switch circuits can be made easily and I have found that their applications is justified. New mechanical....
-
TDA integrated circuits series are very well apreciated and used in amplifier designs and projects. TDA audio amplifier circuits are produced in generally by Philips and SGS-THOMSON. The most used ICs are TDA2030 and TDA2003 for small audio amplifiers kits....
-
This neat device replaces the input transistors and associated circuitry on one TO-220 style device. I had some driver boards made by my printed circuit house and decided that replacing the original driver board with the new PCB...
-
Later, I will use the same pivot table to list the parts out by each of the 8 phases in the build, organizing them into phase-specific bags O` parts. First thing I notice is that there are some slight disconnects between the liberally illustrated, online....
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For the New Zealand band, see Dimmer (band). A common dual dimmer manufactured by Electronic Theatre Controls (ETC)....
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One of the many random devices I`ve found in my sometimes frightening basement was an HP frequency counter. The thing is built like a rock, still works perfectly and the manual contains full parts list, a complete circuit diagram and a description of the....
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If your are like me which I am guessing you are, then ever since you got into doing stuff with arduino you have wanted to make your own arduino board....
-
-
A telephone uses an electric current to convey sound information from your home to that of a friend. When the two of you are talking on the telephone, the telephone company is sending a steady electric current through your telephones. The two telephones,....
-
This tutorial is about mp3 mode of WTV020SD-16P module. With this simple circuit, you can play AD4 format music files. At the end of the article, you can see a video output of this simple and easy project. I used a 5V and a 3. 3V regulators for this project.....
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Car Burglar Alarm timer alarm system circuit, model to economize. This circuit convenients for to set up in an automobile. usually switch at set up keep with automobile door will the circuit closes. But in case of car owner opens in and out while note as a....
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Since you say that with my PWM circuit the current consumption of the inverter shoots to a dangerous 14Amps, therefore I just thought, probably we can solve this by reducing the drive voltage to the gates of the mosfets. This can be simply done by....
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Filter Regulators, solenoid valves, Quick Exhaust Valves, Flowline Pilots - Welcome to Bifold Fluidpower Ltd....
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EncoderBit1(LOW) is negated with the hex inverter U5A and sent to the 4-input AND gate U3A along with EncoderBit0(HIGH), the above J-K output (HIGH), and a HIGH value from Vcc. -During these 5 seconds, the encoder knob is rotated so both bits are set LOW.....
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This circuit is designed to provide delayed relay switching action at power on. The delay is a function of the time constant produced by the combination o....
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an electronic project to build a multivibator as a basic first test instrument - ideal for trouble shooting radio repairs. Includes a how to use guide. An excellent beginner project....
-
This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LE....
-
Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, i....
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SEL2411AA is a sub package of SEL2410, If you need see the description, please click SEL2410. If you need SEL2411AA`s datasheet, please download it from below. By Pericom Semiconductor Corporation ..
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This circuit was constructed to control the pump in a garden pond, so that it automatically turns on at dawn and off again at dusk. Not only does this mean that we don`t have to get cold and wet when turning the pump on or off manually but it`s also one less....
-
In this experiment, an oscillator is constructed using an operational amplifier and some other passive elements. This configuration for the oscillator is called Wien Bridge. The frequency of the oscillator is determined by R4, R5, C1, and C2 elements. In....
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The circuit depicted is the receiver device of a transmitter/receiver combination that will prove extremely handy when tracing the path of electrical wiring in a building or to locate a break in a wire. The corresponding transmitter may be found elsewhere in....
-
Different techniques show how additional PWM (pulse-width modulation) intensity control can be applied to LED (light-emitting diode) drivers....
-
-
Some relays will become warm if they remain energized for some time. The circuit shown here will actuate the relay as before but then reduce the ‘hold cu....
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-
-
-
This circuit can be used as a low cost SRAM and Microcontroller-Microprocessor Battery Backup. All the diodes are 1N4148, The diodes prevent battery discharge back to power source. D8 gives a one way path to charge Battery thru R13 which limits current. D4....
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This circuit may be used to replace the single current limiting resistor often found in dirt cheap battery chargers. The alternative shown here will event....
-
In this time I will share about the circuit voltage stablizer or stabilization using IC 7815 and 7915, with a minimum of 17. 5V to 50V input. The output of this circuit will issue with the current 15V voltage in accordance with the input. Stabilizer is also....
-
Version V2. 9 supports also GPS-receiver with ANTARIS chipset and simultaneously using of internal temperature sensor of MS5534A and external DS1820 sensor. This version can use 24C256, 24C512 or 24C1024 EEPROMs and has an internal `bootloader` implemented.....
-
This Korean SuperCap OEM has support for such use in series. Do you intend to do this manually or automatically like a smart battery charger or simply a power fail backup circuit. You need to balance the voltage and protect from reverse polarity and over....
-
They are op-amp based filters and are most useful in the audio frequency range. These parts calculators are based on formulas and tables from the book " Electronic Filter Design Handbook " by Arthur B. Williams. Bandpass filters pass a contiguous range of....
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Yesterday I was going to start watching a movie, when me and my friendpedrodecided to give up on the movie and build a binary clock. After sometime thinking on how to program it, we made it. It works beautifully, so I decided to show here how I`ve done. It....
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In order to take a high speed photograph one must either have a very fast shutter or light source. We followed the latter course and first examined an commercial flash unit to determine its light profile. This was accomplished by exposing a phototransistor....
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Designing and building a USB sound card longer a head ache got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated bit digital to analog converter that has digital to analog output channels. The integrated interface....
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Fixed some issues with the benito arduino programmer and upgraded it to the latest version of the LUFA library. I hadnt noticed that there was a miss match between the. inf and the library supplied descriptors. My appoligies to the two xp users. As this is....
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This can be a thin strand of wire, like one of the copper "hairs" from a section of lamp cord, which is wired to the altimeter by terminals somewhere on the rocket body and anchored to the launch stand at some point. Rocket takes off, stand holds the wire....
-
The diagrams a circuit which performs this function with 0. 25% exponential conformity over a range from 20 Hz to 15 kHz using a single LM392 and an LM3045 transistor array. The exponential function is generated by Q1, whose collector current will vary....
-
HS101/HS201 are a pair of tiny radio transceiver components. The working frequency is 280MHz. It is suitable for digital signal transmission. The control distance is 30 ~ 100m. All the components including the antenna are packaged in one. It is easy to use.....
-
I n this circuit, the alarm will be switched on under the following four different conditions: 1. When light falls on LDR1 (at the entry to the premises). 2. When light falling on LDR2 is obstructed. 3. When door switches are opened or a wire is broken. 4.....
-
This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset. It will accommodate the usual normally-closed input devices (Magnetic Reed contacts, Micro Switches, Foil Tape and PIRs). And - with a simple modification - a....
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The following circuit shows about L200 Regulator Power Supply Circuit Diagram. Features: used in power supply with voltage and current ....
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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 sound quality, this is usually not a problem because there are plenty of SCART to Cinch adapters available....
-
A variable frequency, variably duty cycle 555 configuration in astable mode. I`m using a set of pots to get a wide range of control. It works beautifully. The output is great, but I have a problem. I am driving a couple mosfets directly from the output. But....
-
The 8-pin 555 timer must be one of the most useful ICs ever made and it is used in many projects. With just a few external components it can be used to build many circuits, not all of them involve timing! A popular version is the NE555 and this is suitable....
-
This will walk through adding hardware to a Linksys WRT54GL wireless router that will take advantage of existing connections on the PCB for two UART connections, which will be exposed as DB9 serial port connectors mounted to the faceplate of the router.....
-
Signal conditioning is a set of operations performed on a signal that makes it suitable for interfacing with other devices or systems. Signal conditioners are the actual devices that perform this operation. These devices have an input and an output. Normally....
-
This post provides the implementation of free running counter ( using c language ) for PIC16F84A micro-controller. This code is written in such a way that,....
-
Interfacing ADC to 8051 microcontroller. ADC0804 is interfaced to microcontroller AT89S51. Complete circuit, theory and program in assembly language....
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More examples to connect your transceivers to the computer for SIMPLEX software operations are described in the pc_tx. bmp file that is included in the simplex. zip file...
-
-
This is a switch selectable dual output "re-hashed" version of my previous (2007) design, and uses a field programmed EPROM for generating both versions of the ringing sequence. AC mains is stepped down to about 10 v AC and fed to the familiar bridge....
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The schematic diagram of the MS Decoder may look complicated but is actually quite simple. Both the Mid and Side signals are initially buffered by unity gain inverting buffers formed around IC1b and IC2 b. This is necessary for two reasons, first to ensure....
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The voltage requirement the Solidus is desirous of is quite a bit higher than your circuit provides I know Chris. It was....
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This project has only a few modifications from the Single Chip, Four Channel Datalogger article, so I won`t go into much detail. Below is the schematic. The changes from Dan`s datalogger are that I used the PIC16F886, which is pin-compatible with the PIC....
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Here is the circuit diagram of a simple and straight forward 12 V battery charger circuit with diagram. This circuit can be used to charge all type of 12V rechargeable batteries including car batteries and motorcycle batteries...
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This is design circuit for UHF transmitter circuit. The TV transmitter circuit is working on the UHF channel, 470-580 MHz frequency channel 21-34. This transmitter can radiate as far as 30-100 meters by using a cable 10-20 cm. This is the figure of the....
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-
Modulation is the process of changing some characteristics (e. g. amplitude, frequency or phase) of a carrier wave in accordance with the intensity of the signal is known as modulation. The figure shows the electronics circuit of a simple am modulator. It is....
-
There is something to be said for the processes of reducing a set of objects or functions down to their lowest common denominator but I think what has really driven me to do this is I am too cheap to go out and buy an Arduino Decemila every time I want to....
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By using the preamplifier with a short length of shielded cable and clip leads, signals that generally could not generate a readout, generate precise and stable readouts on the counter. The DPDT switch is used to bypass the circuit when amplification is not....
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The world`s first practical crystal amplifying device, in 1948, and the dawn of the commercially available Transistor Radio in Britain. If I had been an average radio enthusiast or constructor at that time then I would have been coming to terms with the new....
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Today i want to share with you all my water sensor. This is my second successful project when i started with electronic hobby. This circuit is useful for your plant. How it`s work simple. It will beeping when your plant soil is dry and stop when it detect....
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In electronics H-bridge circuit refers to a configuration consisting of four individual switching devices like transistors or mosfets, such that these can be switched through external discrete signals from respective stages of the involved control circuit.....
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The screen that we watch TV on at home has build-in speakers, but, because it`s actually a computer display, hasn`t got an infrared receiver. This made it impossible to set the volume with the TV receiver remote. I recently bought some Stellaris LaunchPad....
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A negative output voltage dc to dc converter generates a -5V output at pin A. In order to generate -5V at point A. the primary of the transformer must fly back to a diode drop more negative than -5V. If the transformer has a tightly coupled I : 1 turns....
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FM wireless Mike is a small electronic project based on a radio transmitter. It is a wonderful idea to make a wacky talky through which you can talk to your friend, next door. Just speak or play into the microphone and you ’ll broadcast to an FM receiver at....
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This page describes how to wire up RepRap Version II "Mendel". Before you wire the machine up, test the circuit boards individually as described on this page. This is the overall Mendel wiring diagram; click the image for a full-resolution version. The....
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This a shows the overall circuit diagram of the power control unit. On the left, there is a main relais controlled by the key switch and the ...
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The shown three-phase application circuit owns motor controller circuit connection diagram which is driven by full wave six-step.The power switch triode is Darlington PNP type and the lower power switch triode is N groove power MOSFET. Each device contains a....
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The theory of operation has already been covered either in the Simple Superhet or the All American Five. Building this radio is really not hard especially if you have been working along through the circuits in the order I have presented them. The variable....
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The Intersil ICL7106 and ICL7107 are high performance, low power, 31/2 digit A/D converters. Included are seven segment decoders, display drivers, a reference, and a clock. The ICL7106 is designed to interface with a liquid crystal display (LCD) and includes....
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I`ve had an interest in building a simple VXO transmitter for many years, but was unsure that the limited tuning range usually associated with VXOs would be useful on the busy HF bands. However, the ability to switch a number of crystals, and cover a number....
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ESP - The Audio Pages. Amplifier design techniques, find out how amplifiers work, and how to design them....
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The Johnson 275 watt and Kilowatt Matchboxes are both unnecessarily exaggerated and unnecessarily maligned. They are not exceptional tuners, and are not poor designs. The primary drawbacks are the fixed coupling link, and the fact they are balanced VOLTAGE....
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The M15m Tracking Transmitter is a modified version of the M15 Animal Tracking Transmitter. It has been designed to be used on 147. 460 MHz using an inexpensive 49. 152 computer crystal and for printed circuit board construction. The M15m transmitter is a....
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In the ADM666A application note, you can find detailed explanation about this low cost battery charger circuit such as Maximum output voltage, Charge termination voltage calculation, monitoring the battery voltage level, maximizing the circuit efficiency,....
The circuit of the transmitter is shown in Figure 1, and as you can see it is quite simple. The first stage is the oscillator, and is tuned with the variable capacitor. Select an unused frequency, and carefully adjust C3 until the background noise stops (you....
Designed in the fifties, this pre-amp remained in production until 1975. And, it remains fully functional and serviceable today. This discussion is designed to help owners do some basic troubleshooting and, we`ll get into some depth of circuit operation as....
Timer start-pulse generator is fast series-transistor coincidence circuit. Slop-gate generator is one-shot mvbr that prevents 1N97A diode from passing blocking oscillator negative sync pulse until mvbr fires. Used to count number of sing-around cycles and....
The ADUC816 is a complete smart transducer front-end, inte- grating two high-resolution sigma-delta ADCs an 8-bit MCU, and program/data Flash EE Memory on a single chip. This low power device accepts low-level signals directly from a transducer. The two....
One is in good shape, made in 1979, and capable of producing sine, triangle and square waveforms. This one is retained and used as main function generator for testing purposes at my main office location. Other three were not working, or working sporadically.....
The circuit is formed by light metering circuit and flash circuit,just as shown in picture.It is suitable for POPTICS (a popular integrated camera), Franka X-500, WIZEN-860S and so on.It consists of the following circuit:(1)VT1,VT2,light metering device RG....
This application note describes a Digital Blood Pressure Meter concept which uses an integrated Pressure Sensor Analog signal-conditioning circuitry, Microcontroller hardware/software and a liquid crystal Display The sensing system reads the cuff pressure....
The UTC H1277 is a semiconducting integrated Hall Effect Sensor IC. It is just like all the hall sensitive Hall Effect Sensors designed to work in the situations which the accurate track is extremely small and the changes in magnetic flux density-changes are....
Another method of using opamps to regulate a power supply is shown below. The power transformer requires an additional winding to supply the op-amps with a bipolar voltage (+/- 8 volts), and the negative voltage is also used to generate a reference voltage....
PIC development/testing board Here`s a PCB design for a bare bones PIC16F877 development board. All you need is a 4mhz crystal, two 22pf caps, one 4.7k res....
This little PC Watcher circuit will help you to prevent unauthorised access to your personal computer. After construction on a small piece of veroborad, en....
The total dollars count for all parts is much smaller that the cost of an heavy duty DPDT foot switch. As seen on the previous page suggested electronic switch circuits can be made easily and I have found that their applications is justified. New mechanical....
TDA integrated circuits series are very well apreciated and used in amplifier designs and projects. TDA audio amplifier circuits are produced in generally by Philips and SGS-THOMSON. The most used ICs are TDA2030 and TDA2003 for small audio amplifiers kits....
This neat device replaces the input transistors and associated circuitry on one TO-220 style device. I had some driver boards made by my printed circuit house and decided that replacing the original driver board with the new PCB...
Later, I will use the same pivot table to list the parts out by each of the 8 phases in the build, organizing them into phase-specific bags O` parts. First thing I notice is that there are some slight disconnects between the liberally illustrated, online....
For the New Zealand band, see Dimmer (band). A common dual dimmer manufactured by Electronic Theatre Controls (ETC)....
One of the many random devices I`ve found in my sometimes frightening basement was an HP frequency counter. The thing is built like a rock, still works perfectly and the manual contains full parts list, a complete circuit diagram and a description of the....
If your are like me which I am guessing you are, then ever since you got into doing stuff with arduino you have wanted to make your own arduino board....
A telephone uses an electric current to convey sound information from your home to that of a friend. When the two of you are talking on the telephone, the telephone company is sending a steady electric current through your telephones. The two telephones,....
This tutorial is about mp3 mode of WTV020SD-16P module. With this simple circuit, you can play AD4 format music files. At the end of the article, you can see a video output of this simple and easy project. I used a 5V and a 3. 3V regulators for this project.....
Car Burglar Alarm timer alarm system circuit, model to economize. This circuit convenients for to set up in an automobile. usually switch at set up keep with automobile door will the circuit closes. But in case of car owner opens in and out while note as a....
Since you say that with my PWM circuit the current consumption of the inverter shoots to a dangerous 14Amps, therefore I just thought, probably we can solve this by reducing the drive voltage to the gates of the mosfets. This can be simply done by....
Filter Regulators, solenoid valves, Quick Exhaust Valves, Flowline Pilots - Welcome to Bifold Fluidpower Ltd....
EncoderBit1(LOW) is negated with the hex inverter U5A and sent to the 4-input AND gate U3A along with EncoderBit0(HIGH), the above J-K output (HIGH), and a HIGH value from Vcc. -During these 5 seconds, the encoder knob is rotated so both bits are set LOW.....
This circuit is designed to provide delayed relay switching action at power on. The delay is a function of the time constant produced by the combination o....
an electronic project to build a multivibator as a basic first test instrument - ideal for trouble shooting radio repairs. Includes a how to use guide. An excellent beginner project....
This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LE....
Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, i....
SEL2411AA is a sub package of SEL2410, If you need see the description, please click SEL2410. If you need SEL2411AA`s datasheet, please download it from below. By Pericom Semiconductor Corporation ..
This circuit was constructed to control the pump in a garden pond, so that it automatically turns on at dawn and off again at dusk. Not only does this mean that we don`t have to get cold and wet when turning the pump on or off manually but it`s also one less....
In this experiment, an oscillator is constructed using an operational amplifier and some other passive elements. This configuration for the oscillator is called Wien Bridge. The frequency of the oscillator is determined by R4, R5, C1, and C2 elements. In....
The circuit depicted is the receiver device of a transmitter/receiver combination that will prove extremely handy when tracing the path of electrical wiring in a building or to locate a break in a wire. The corresponding transmitter may be found elsewhere in....
Different techniques show how additional PWM (pulse-width modulation) intensity control can be applied to LED (light-emitting diode) drivers....
Some relays will become warm if they remain energized for some time. The circuit shown here will actuate the relay as before but then reduce the ‘hold cu....
This circuit can be used as a low cost SRAM and Microcontroller-Microprocessor Battery Backup. All the diodes are 1N4148, The diodes prevent battery discharge back to power source. D8 gives a one way path to charge Battery thru R13 which limits current. D4....
This circuit may be used to replace the single current limiting resistor often found in dirt cheap battery chargers. The alternative shown here will event....
In this time I will share about the circuit voltage stablizer or stabilization using IC 7815 and 7915, with a minimum of 17. 5V to 50V input. The output of this circuit will issue with the current 15V voltage in accordance with the input. Stabilizer is also....
Version V2. 9 supports also GPS-receiver with ANTARIS chipset and simultaneously using of internal temperature sensor of MS5534A and external DS1820 sensor. This version can use 24C256, 24C512 or 24C1024 EEPROMs and has an internal `bootloader` implemented.....
This Korean SuperCap OEM has support for such use in series. Do you intend to do this manually or automatically like a smart battery charger or simply a power fail backup circuit. You need to balance the voltage and protect from reverse polarity and over....
They are op-amp based filters and are most useful in the audio frequency range. These parts calculators are based on formulas and tables from the book " Electronic Filter Design Handbook " by Arthur B. Williams. Bandpass filters pass a contiguous range of....
Yesterday I was going to start watching a movie, when me and my friendpedrodecided to give up on the movie and build a binary clock. After sometime thinking on how to program it, we made it. It works beautifully, so I decided to show here how I`ve done. It....
In order to take a high speed photograph one must either have a very fast shutter or light source. We followed the latter course and first examined an commercial flash unit to determine its light profile. This was accomplished by exposing a phototransistor....
Designing and building a USB sound card longer a head ache got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated bit digital to analog converter that has digital to analog output channels. The integrated interface....
Fixed some issues with the benito arduino programmer and upgraded it to the latest version of the LUFA library. I hadnt noticed that there was a miss match between the. inf and the library supplied descriptors. My appoligies to the two xp users. As this is....
This can be a thin strand of wire, like one of the copper "hairs" from a section of lamp cord, which is wired to the altimeter by terminals somewhere on the rocket body and anchored to the launch stand at some point. Rocket takes off, stand holds the wire....
The diagrams a circuit which performs this function with 0. 25% exponential conformity over a range from 20 Hz to 15 kHz using a single LM392 and an LM3045 transistor array. The exponential function is generated by Q1, whose collector current will vary....
HS101/HS201 are a pair of tiny radio transceiver components. The working frequency is 280MHz. It is suitable for digital signal transmission. The control distance is 30 ~ 100m. All the components including the antenna are packaged in one. It is easy to use.....
I n this circuit, the alarm will be switched on under the following four different conditions: 1. When light falls on LDR1 (at the entry to the premises). 2. When light falling on LDR2 is obstructed. 3. When door switches are opened or a wire is broken. 4.....
This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset. It will accommodate the usual normally-closed input devices (Magnetic Reed contacts, Micro Switches, Foil Tape and PIRs). And - with a simple modification - a....
The following circuit shows about L200 Regulator Power Supply Circuit Diagram. Features: used in power supply with voltage and current ....
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 sound quality, this is usually not a problem because there are plenty of SCART to Cinch adapters available....
A variable frequency, variably duty cycle 555 configuration in astable mode. I`m using a set of pots to get a wide range of control. It works beautifully. The output is great, but I have a problem. I am driving a couple mosfets directly from the output. But....
The 8-pin 555 timer must be one of the most useful ICs ever made and it is used in many projects. With just a few external components it can be used to build many circuits, not all of them involve timing! A popular version is the NE555 and this is suitable....
This will walk through adding hardware to a Linksys WRT54GL wireless router that will take advantage of existing connections on the PCB for two UART connections, which will be exposed as DB9 serial port connectors mounted to the faceplate of the router.....
Signal conditioning is a set of operations performed on a signal that makes it suitable for interfacing with other devices or systems. Signal conditioners are the actual devices that perform this operation. These devices have an input and an output. Normally....
This post provides the implementation of free running counter ( using c language ) for PIC16F84A micro-controller. This code is written in such a way that,....
Interfacing ADC to 8051 microcontroller. ADC0804 is interfaced to microcontroller AT89S51. Complete circuit, theory and program in assembly language....
More examples to connect your transceivers to the computer for SIMPLEX software operations are described in the pc_tx. bmp file that is included in the simplex. zip file...
This is a switch selectable dual output "re-hashed" version of my previous (2007) design, and uses a field programmed EPROM for generating both versions of the ringing sequence. AC mains is stepped down to about 10 v AC and fed to the familiar bridge....
The schematic diagram of the MS Decoder may look complicated but is actually quite simple. Both the Mid and Side signals are initially buffered by unity gain inverting buffers formed around IC1b and IC2 b. This is necessary for two reasons, first to ensure....
The voltage requirement the Solidus is desirous of is quite a bit higher than your circuit provides I know Chris. It was....
This project has only a few modifications from the Single Chip, Four Channel Datalogger article, so I won`t go into much detail. Below is the schematic. The changes from Dan`s datalogger are that I used the PIC16F886, which is pin-compatible with the PIC....
Here is the circuit diagram of a simple and straight forward 12 V battery charger circuit with diagram. This circuit can be used to charge all type of 12V rechargeable batteries including car batteries and motorcycle batteries...
This is design circuit for UHF transmitter circuit. The TV transmitter circuit is working on the UHF channel, 470-580 MHz frequency channel 21-34. This transmitter can radiate as far as 30-100 meters by using a cable 10-20 cm. This is the figure of the....
Modulation is the process of changing some characteristics (e. g. amplitude, frequency or phase) of a carrier wave in accordance with the intensity of the signal is known as modulation. The figure shows the electronics circuit of a simple am modulator. It is....
There is something to be said for the processes of reducing a set of objects or functions down to their lowest common denominator but I think what has really driven me to do this is I am too cheap to go out and buy an Arduino Decemila every time I want to....
By using the preamplifier with a short length of shielded cable and clip leads, signals that generally could not generate a readout, generate precise and stable readouts on the counter. The DPDT switch is used to bypass the circuit when amplification is not....
The world`s first practical crystal amplifying device, in 1948, and the dawn of the commercially available Transistor Radio in Britain. If I had been an average radio enthusiast or constructor at that time then I would have been coming to terms with the new....
Today i want to share with you all my water sensor. This is my second successful project when i started with electronic hobby. This circuit is useful for your plant. How it`s work simple. It will beeping when your plant soil is dry and stop when it detect....
In electronics H-bridge circuit refers to a configuration consisting of four individual switching devices like transistors or mosfets, such that these can be switched through external discrete signals from respective stages of the involved control circuit.....
The screen that we watch TV on at home has build-in speakers, but, because it`s actually a computer display, hasn`t got an infrared receiver. This made it impossible to set the volume with the TV receiver remote. I recently bought some Stellaris LaunchPad....
A negative output voltage dc to dc converter generates a -5V output at pin A. In order to generate -5V at point A. the primary of the transformer must fly back to a diode drop more negative than -5V. If the transformer has a tightly coupled I : 1 turns....
FM wireless Mike is a small electronic project based on a radio transmitter. It is a wonderful idea to make a wacky talky through which you can talk to your friend, next door. Just speak or play into the microphone and you ’ll broadcast to an FM receiver at....
This page describes how to wire up RepRap Version II "Mendel". Before you wire the machine up, test the circuit boards individually as described on this page. This is the overall Mendel wiring diagram; click the image for a full-resolution version. The....
This a shows the overall circuit diagram of the power control unit. On the left, there is a main relais controlled by the key switch and the ...
The shown three-phase application circuit owns motor controller circuit connection diagram which is driven by full wave six-step.The power switch triode is Darlington PNP type and the lower power switch triode is N groove power MOSFET. Each device contains a....
The theory of operation has already been covered either in the Simple Superhet or the All American Five. Building this radio is really not hard especially if you have been working along through the circuits in the order I have presented them. The variable....
The Intersil ICL7106 and ICL7107 are high performance, low power, 31/2 digit A/D converters. Included are seven segment decoders, display drivers, a reference, and a clock. The ICL7106 is designed to interface with a liquid crystal display (LCD) and includes....
I`ve had an interest in building a simple VXO transmitter for many years, but was unsure that the limited tuning range usually associated with VXOs would be useful on the busy HF bands. However, the ability to switch a number of crystals, and cover a number....
ESP - The Audio Pages. Amplifier design techniques, find out how amplifiers work, and how to design them....
The Johnson 275 watt and Kilowatt Matchboxes are both unnecessarily exaggerated and unnecessarily maligned. They are not exceptional tuners, and are not poor designs. The primary drawbacks are the fixed coupling link, and the fact they are balanced VOLTAGE....
The M15m Tracking Transmitter is a modified version of the M15 Animal Tracking Transmitter. It has been designed to be used on 147. 460 MHz using an inexpensive 49. 152 computer crystal and for printed circuit board construction. The M15m transmitter is a....
