New Circuits Page 113
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This is PWM Speed DC motor Rotation circuit. It can Forard-Reverse and Regenerative Braking function. By this circuit use a signal PWM control the speed of DC 12V motor with Power mosfet IRF150. The relay RY1 use control Reverse with the digital alarm,....
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You will find later some applications such as Basic Circuit Description, Block Diagram of the MF10, Programmable Dual Clock Generator, Butterworth Lowpass filter, MF10 as an Input Filter and Sample/Hold, Generating Quadrature Sine Waves, and the....
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Man has long wrestled with Time. Also, with knocking on things and not getting the time of day. We propose a knocking platform through which these fundamental needs are met. This is illustrated with the Knock Block KUI and accompanying Clock Knock Block....
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The high-tech credit card has been nicknamed "microcontroller super card" because of all the great improvement ideas. I showed how to first verify the code, and then upload on to the arduino board. I then wrote a code for the counter to go from 0 to 9 using....
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Each components of the circuit is shown in a simple block form with a corresponding label for identification purposes, using no special symbols or language and the interconnections of these components are represented by solid lines. You can read the block....
-
Analog to Digital Converters - Successive Approximation Type Analog to Digital Converter, working,circuit diagram....
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-
There is not a coaxial input to the motor control chassis, so I doubt that composite sync was fed to it (cables would be 5 or 6 feet long), which might rule out a sync pulse for the red field. Some other interesting things. The CRT has the pin type anode....
-
This page contains circuit diagrams and code for a walking robot I made using Mark Tilden`s nervous network along with my own tinkerings like the reverser and brain circuits. Construction is a bit odd, chips with pins bent flat with wirebits and parts....
-
The RF Tester (A3014) is a combination of four circuits. Its purpose is to test several circuit ideas, both by implementing them, and by providing better support circuits for their development. The Modulating Transmitter (A3014MT) replaces our original....
-
A 27MHz transmitter circuit schematic with MC2833 and 2 FET transistors MPF6660. Using a Motorola MC2833 one-chip FM transmitter, a few support components....
-
This is a Circuits of fluorescent lamp with a power of 40 Watt - The ambit works abundant like the aboriginal Strobos. except that a beaming tube is used. Thus, the beaming tube zG ndbereit charcoal constant, the two electrodes of the tube are continuously....
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-
-
A number of shunts and multipliers selected by a switch can be used in association with a single basic meter to form a multirange instrument, known as a multimeter. this is capable of measuring volts, current and resistance. A multirange meter can be....
-
This page details the construction of a prototype dye laser that is intended for initial checking of some parameters — for example, I want to know whether a simple design will threshold easy dyes with minimal input energy. In principle, the answer is....
-
This is a diy simple stun gun circuit showned only for learning! In No Way Do I Recommend Building these Stun-Guns or the actual use of them for any purpos....
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Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. A correct grounding is very important to eliminate hum and ground loops.....
-
This article provides an overview of the R100 and MCR100 UHF repeaters. All of the information came from physical examination of the station and running the programming software, as well as the R100 Instruction (and service) Manual, p/n 6881078E15 and the....
-
-
This circuit allows a smaller control voltage to inversely linearly control a larger output voltage Vo. Another feature is that Vsp the supply to the op-amps can be lower than the output voltage so in theory this circuit could control a output voltage of any....
-
This project implements a composite USB device supporting two USB 2. 0 full-speed gameport HID interfaces. The physical joystick ports are wired in accordance to the `Atari standard` allowing connection of most Commodore 64 and Amiga joysticks as well as....
-
The circuit is shown in receive mode, PTT switches to transmit, the speaker serves as a microphone and speaker. All systems I`ve seen use a Rocking Armature Transducer for the speaker. There is no base station or similar - you can just connect two or more of....
-
-
The circuit has educational purpose, so being simple is a must. I`m also trying to build it only with components that I already have (a bunch of resistors, capacitors, transistors and none IC)...
-
-
The Lorenz system is one of a few standard oscillators commonly used to explore chaos [1]. An accessible description of its mathematical features and chaotic dynamics is presented by Thompson and Stewart [2]. This important system was originally developed as....
-
A segment may be tested by applying an alternating voltage of a few volts across it. Note that the application of a direct voltage will damage the display irreversibly: the resulting current will remove the tracks. The alternating voltage should contain not....
-
The circuit diagram of a simple capacitance meter using IC LM2917 is shown here. The LM2917 is a high gain monolithic frequency to voltage converter IC from National Semiconductors. Even though the main application of LM2917 is in tachometers, it can be also....
-
The following circuit shows a Digital Compass Circuit. This circuit based on the 7805 IC. Features: simple and accurate electronic compass, solid ....
-
-
The circuit mentioned here is a small easy to build Intercom circuit using one LM386 IC one 2N3904 transistor and few other components. LM386 is a very famous amplifier ICs mostly used by electronics hobbyists in audio circuits. In this circuit the 8 ohms....
-
-
A higher end version of the same thing, with a few extra user selectable settings to allow audible as well as ultrasonic output so it can be more effective against animals:..
-
This circuit makes a nice, clean preamp or a clean booster pedal. It is not designed for overdrive, but is designed to be overdrivable. If overdriven, it provides the kind of soft clipping one may expect from JFETs, but it is not optimized to be generally....
-
Here is the full schematic for the driver. I chose to use a PIC16F628 as the microcontroller because it is cheap, has a internal oscillator (4 MHz) and an internal USART. NOTE: There is an error in this schematic and a pull-up resistor on RA5 (pin 4 in the....
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Friends that seek 5V 10A power supply circuit small-sized and build easy. I begs for to advise this circuit. It is 10A switching regulator by use IC L4970A. Then build easy as an example integrated readymade circuit. Important point be power supply input....
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The EIA/TIA-423 Unbalanced (Single-Ended) interface; specifies a single, unidirectional driver with multiple receivers (up to 10). ". Specifies the electrical characteristics of the unbalanced voltage digital interface circuit, normally implemented in....
-
Most dimmers use pulse width modulation (PWM) to control the amount of power that is delivered to the lamp. Those that come bundled with a switch faceplat....
-
After repairing a couple of Hewlett Packard vacuum tube voltmeters, I read up on some of the company history. I was able to locate a HP-200C oscillator. This HP-200C is very close in design to the company`s initial product. It is a Wien bridge....
-
This is Resonant Mode LED Driver circuit. This circuit is used to give a constant DC current through a string of a given number of LEDs. This circuit uses...
-
Each power supply, whether linear or switcher, uses at least two operating modes that characterize its operation: constant voltage (CV) and constant current (CC). The power supply can work in either one, while the other is usually a protective mode, both for....
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-
-
-
Testing whether a transistor is shorted or open usually done by ohm meter. You test if the base to emitter? or collector permit a current flow in one...
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Learn how to fortify your fortress no matter what the size with this ingenious myriad of a customizable laser grid. Once someone steps through and bre....
-
Color TV subcarrier generator. The crystal shown is for 3. 58 MHz. The ECG1131 noted on the schematic is a chroma signal amplifier. The ECG1132 is a 16-pin DIP (courtesy GTE Sylvania Incorporated). ..
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When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc....
-
Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
-
-
Phase-sensitive detectors usually take the difference between an input FM signal and the same signal after it has passed through a resonant circuit, or through a delay line. A 1N34 should work fine to detect 100MHz, but not all 1N34 diodes are made alike.....
-
-
The ADP1864 is a compact, inexpensive, constant-frequency current-mode step-down dc-to-dc controller. The ADP1864 drives a P-channel MOSFET that regulates an output voltage as low as 0.8 V with ±2% accuracy, for up to 5 A load currents, from input voltages....
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We know that on the market there are plenty of devices that replace normal wall switches and let you adjust the luminosity of a bulb. But if you want to make an "intelligent" home or a more complicated device to adjust the power of a light bulb....
-
This Super Light Sensor responds to minute fluctuations in light level, auto-adjusting over the range from about 200 lux up to 60, 000 lux (ie, from a modestly lit room to direct sunlight). It has lots of potential uses eg, detecting a car entering a....
-
Stops charging when battery is full charged, Portable unit Charging of the mobile phone, cellphone battery is a big problem while traveling as power suppl....
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This is a design circuit for converter that using for a very practical LM2623A ratio adaptive circuit to drive a digital camera motor. It produces 5 volts from input voltages ranging between 1. 8 and 4. 5 volts. This is the figure of the circuit; The duty....
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The UTC A6966 is designed for 5 LED level meter driver in 9 lead SIP package. It consists of one input Amplifier and five Comparators for LED level indication. By LianShun Electronics Co. , Ltd ..
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The following circuit shows about TL163 IC For Ultrasonic Remote Control Circuit Diagram. Features:detector, high-gain amplifier, low-frequency ...
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Low cost solution for charging of both NiCd and NiMh batteries Here is the circuit diagram of a low cost universal charger for NiCD NiMH batteries. This....
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-
This article describes the The 555 Timer Design (NE555N). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these....
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This small PCB, which I named Multiuse tiny1 was originally designed to convert NES/SNES controllers to USB. Since there is not a lot of space availabe inside an SNES controller, I designed the PCB to be as small as necessary. The PCB has improved since the....
-
12V to 3V convertor. This is an simple and cheap circuit to convert voltage from 12V to 3V.In fact this is a basic regulator circuit. The output voltage...
-
Most of the time a charged lead-acid battery and a power inverter would be used to ensure a smoothly organised holiday where ideally the missus and the children cheerfully use their electric and electronic gear! With rechargeable lead-acid batteries it`s....
-
Micro or analog? These days it is getting harder to choose. The 555 timer was the benchmark of flexibility. How does it fare today?...
-
AVR In System Programmer UK manufactured by Kanda who are a popular choice for AVR In System Programmer UK and AVR In System Programmer worldwide....
-
The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
-
-
The motion detector circuit consists of two components, the emitter and the sensor/detector. The emitter is simply made up of an infrared emitting diode reverse biased to a 5-volt source. The sensor uses the MRD821 to detect the IR beam from the emitter. It....
-
This is a very simple RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module (WZ-X01). Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy. The transmitter can be powered....
-
A simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the5 Voltavailable from the USB port. The 5V from the USB port is passed through current limiting resistor R2 and transistor Q1. The base of....
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This article continues the AT90S4433 Microcontroller series. I suggest you to read the previous articles on Atmel Microcontroller programming with regards to: This time we design a frequency counter which can measure frequencies from 1Hz to 100MHz.....
-
This is a design for sawtooth generator circuit. The advantage of this circuit is low cost and produces an auxiliary square wave at the same frequency. This circuit can be used to sweep the frequency of another generator. This is the figure of the circuit. A....
-
This is a very simple lamp flasher circuit that uses only three components (a capacitor, relay and one resistor) other than the lamp. The working of the circuit is very straight forward. When the power is switched ON the capacitor C1 charges through the....
-
Here we provided several schematic drawings of battery charger circuit. These circuits covered 5W~200W NiCd, NIMH, Lead-Acid, and Li-Ion/Polymer, LiFePo4 battery packs. We hope chargers circuits files can help our users to select correct chargers also can....
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Note, Q3 and Q4 in Figure below are complementary, NPN and PNP respectively. This circuit works well for moderate power audio amplifiers. For an explanation of this circuit see Direct coupled complementary-pair, Ch 4. ..
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The circuit diagram of Radio Collar Transmitter has been described here. This circuit is based on the IC NE 555 which is the central part...
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We can use boost converter such as TPS61160/1 with a 40V rated integrated switch FET to drive up to LEDs in series. We can use it to reduce output ripple,....
-
Current generated flows through clips placed on the earlobes Output current adjustable from 80 to 600 microAmperes Owing to the recent launching in Europe....
-
Building your own guitar foot pedal Would you like to try your hand at soldering Do you like point to point circuitry Would you like an overdrive pedal that will give you clean signal boost and smooth distortion Do you want to add a new pedal to your....
-
This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components. This circuit....
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-
This circuit consists of two identical intercom units. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circuit. Only 2 wires are required to connect the units together. Due to the low output....
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-
Walky-talky in this website is world first verified project made without using any coil range up to 500M circuit diagram of walky-talky with description walky-talky is communication ...
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-
This article describes how to build a general purpose DTMF decoder with a low-price chip from MITEL. The circuit supports DTMF squelch based on 3 digits station ID (full 999 combination). It also supports decoding of 4 additional commands - station ID plus....
-
-
Two detector systems in the Hall-A spectrometers make use of potentially flammable gasses: the Vertical Drift Chambers (VDC) and the Focal Plane Polarimeter (FPP) straw tubes. This document is intended to address the practical need for a users manual for....
-
-
-
This circuit is an oscillator that generates a square wave. The op-amp starts with its two inputs in an unknown state; let`s say it starts with + slightly higher than. The op-amp greatly amplifies this difference, bringing its output to the op-amp`s positive....
-
Hi, I wanted to build an IR-transmitter-receiver system to send signals to a device . Let`s say the device is a simple blue LED (just to make life....
-
Ne555 is one of the most commonly used timer IC. It is a monolithic timing circuit that can produce accurate and highly stable time delays or oscillations. Like general purpose OP AMPs, it is very much reliable, easy to use and cheaper in cost. It has a....
-
This is PWM Speed DC motor Rotation circuit. It can Forard-Reverse and Regenerative Braking function. By this circuit use a signal PWM control the speed of DC 12V motor with Power mosfet IRF150. The relay RY1 use control Reverse with the digital alarm,....
You will find later some applications such as Basic Circuit Description, Block Diagram of the MF10, Programmable Dual Clock Generator, Butterworth Lowpass filter, MF10 as an Input Filter and Sample/Hold, Generating Quadrature Sine Waves, and the....
Man has long wrestled with Time. Also, with knocking on things and not getting the time of day. We propose a knocking platform through which these fundamental needs are met. This is illustrated with the Knock Block KUI and accompanying Clock Knock Block....
The high-tech credit card has been nicknamed "microcontroller super card" because of all the great improvement ideas. I showed how to first verify the code, and then upload on to the arduino board. I then wrote a code for the counter to go from 0 to 9 using....
Each components of the circuit is shown in a simple block form with a corresponding label for identification purposes, using no special symbols or language and the interconnections of these components are represented by solid lines. You can read the block....
Analog to Digital Converters - Successive Approximation Type Analog to Digital Converter, working,circuit diagram....
There is not a coaxial input to the motor control chassis, so I doubt that composite sync was fed to it (cables would be 5 or 6 feet long), which might rule out a sync pulse for the red field. Some other interesting things. The CRT has the pin type anode....
This page contains circuit diagrams and code for a walking robot I made using Mark Tilden`s nervous network along with my own tinkerings like the reverser and brain circuits. Construction is a bit odd, chips with pins bent flat with wirebits and parts....
The RF Tester (A3014) is a combination of four circuits. Its purpose is to test several circuit ideas, both by implementing them, and by providing better support circuits for their development. The Modulating Transmitter (A3014MT) replaces our original....
A 27MHz transmitter circuit schematic with MC2833 and 2 FET transistors MPF6660. Using a Motorola MC2833 one-chip FM transmitter, a few support components....
This is a Circuits of fluorescent lamp with a power of 40 Watt - The ambit works abundant like the aboriginal Strobos. except that a beaming tube is used. Thus, the beaming tube zG ndbereit charcoal constant, the two electrodes of the tube are continuously....
A number of shunts and multipliers selected by a switch can be used in association with a single basic meter to form a multirange instrument, known as a multimeter. this is capable of measuring volts, current and resistance. A multirange meter can be....
This page details the construction of a prototype dye laser that is intended for initial checking of some parameters — for example, I want to know whether a simple design will threshold easy dyes with minimal input energy. In principle, the answer is....
This is a diy simple stun gun circuit showned only for learning! In No Way Do I Recommend Building these Stun-Guns or the actual use of them for any purpos....
Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. A correct grounding is very important to eliminate hum and ground loops.....
This article provides an overview of the R100 and MCR100 UHF repeaters. All of the information came from physical examination of the station and running the programming software, as well as the R100 Instruction (and service) Manual, p/n 6881078E15 and the....
This circuit allows a smaller control voltage to inversely linearly control a larger output voltage Vo. Another feature is that Vsp the supply to the op-amps can be lower than the output voltage so in theory this circuit could control a output voltage of any....
This project implements a composite USB device supporting two USB 2. 0 full-speed gameport HID interfaces. The physical joystick ports are wired in accordance to the `Atari standard` allowing connection of most Commodore 64 and Amiga joysticks as well as....
The circuit is shown in receive mode, PTT switches to transmit, the speaker serves as a microphone and speaker. All systems I`ve seen use a Rocking Armature Transducer for the speaker. There is no base station or similar - you can just connect two or more of....
The circuit has educational purpose, so being simple is a must. I`m also trying to build it only with components that I already have (a bunch of resistors, capacitors, transistors and none IC)...
The Lorenz system is one of a few standard oscillators commonly used to explore chaos [1]. An accessible description of its mathematical features and chaotic dynamics is presented by Thompson and Stewart [2]. This important system was originally developed as....
A segment may be tested by applying an alternating voltage of a few volts across it. Note that the application of a direct voltage will damage the display irreversibly: the resulting current will remove the tracks. The alternating voltage should contain not....
The circuit diagram of a simple capacitance meter using IC LM2917 is shown here. The LM2917 is a high gain monolithic frequency to voltage converter IC from National Semiconductors. Even though the main application of LM2917 is in tachometers, it can be also....
The following circuit shows a Digital Compass Circuit. This circuit based on the 7805 IC. Features: simple and accurate electronic compass, solid ....
The circuit mentioned here is a small easy to build Intercom circuit using one LM386 IC one 2N3904 transistor and few other components. LM386 is a very famous amplifier ICs mostly used by electronics hobbyists in audio circuits. In this circuit the 8 ohms....
A higher end version of the same thing, with a few extra user selectable settings to allow audible as well as ultrasonic output so it can be more effective against animals:..
This circuit makes a nice, clean preamp or a clean booster pedal. It is not designed for overdrive, but is designed to be overdrivable. If overdriven, it provides the kind of soft clipping one may expect from JFETs, but it is not optimized to be generally....
Here is the full schematic for the driver. I chose to use a PIC16F628 as the microcontroller because it is cheap, has a internal oscillator (4 MHz) and an internal USART. NOTE: There is an error in this schematic and a pull-up resistor on RA5 (pin 4 in the....
Friends that seek 5V 10A power supply circuit small-sized and build easy. I begs for to advise this circuit. It is 10A switching regulator by use IC L4970A. Then build easy as an example integrated readymade circuit. Important point be power supply input....
The EIA/TIA-423 Unbalanced (Single-Ended) interface; specifies a single, unidirectional driver with multiple receivers (up to 10). ". Specifies the electrical characteristics of the unbalanced voltage digital interface circuit, normally implemented in....
Most dimmers use pulse width modulation (PWM) to control the amount of power that is delivered to the lamp. Those that come bundled with a switch faceplat....
After repairing a couple of Hewlett Packard vacuum tube voltmeters, I read up on some of the company history. I was able to locate a HP-200C oscillator. This HP-200C is very close in design to the company`s initial product. It is a Wien bridge....
This is Resonant Mode LED Driver circuit. This circuit is used to give a constant DC current through a string of a given number of LEDs. This circuit uses...
Each power supply, whether linear or switcher, uses at least two operating modes that characterize its operation: constant voltage (CV) and constant current (CC). The power supply can work in either one, while the other is usually a protective mode, both for....
Testing whether a transistor is shorted or open usually done by ohm meter. You test if the base to emitter? or collector permit a current flow in one...
Learn how to fortify your fortress no matter what the size with this ingenious myriad of a customizable laser grid. Once someone steps through and bre....
Color TV subcarrier generator. The crystal shown is for 3. 58 MHz. The ECG1131 noted on the schematic is a chroma signal amplifier. The ECG1132 is a 16-pin DIP (courtesy GTE Sylvania Incorporated). ..
When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc....
Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
Phase-sensitive detectors usually take the difference between an input FM signal and the same signal after it has passed through a resonant circuit, or through a delay line. A 1N34 should work fine to detect 100MHz, but not all 1N34 diodes are made alike.....
The ADP1864 is a compact, inexpensive, constant-frequency current-mode step-down dc-to-dc controller. The ADP1864 drives a P-channel MOSFET that regulates an output voltage as low as 0.8 V with ±2% accuracy, for up to 5 A load currents, from input voltages....
We know that on the market there are plenty of devices that replace normal wall switches and let you adjust the luminosity of a bulb. But if you want to make an "intelligent" home or a more complicated device to adjust the power of a light bulb....
This Super Light Sensor responds to minute fluctuations in light level, auto-adjusting over the range from about 200 lux up to 60, 000 lux (ie, from a modestly lit room to direct sunlight). It has lots of potential uses eg, detecting a car entering a....
Stops charging when battery is full charged, Portable unit Charging of the mobile phone, cellphone battery is a big problem while traveling as power suppl....
This is a design circuit for converter that using for a very practical LM2623A ratio adaptive circuit to drive a digital camera motor. It produces 5 volts from input voltages ranging between 1. 8 and 4. 5 volts. This is the figure of the circuit; The duty....
The UTC A6966 is designed for 5 LED level meter driver in 9 lead SIP package. It consists of one input Amplifier and five Comparators for LED level indication. By LianShun Electronics Co. , Ltd ..
The following circuit shows about TL163 IC For Ultrasonic Remote Control Circuit Diagram. Features:detector, high-gain amplifier, low-frequency ...
Low cost solution for charging of both NiCd and NiMh batteries Here is the circuit diagram of a low cost universal charger for NiCD NiMH batteries. This....
This article describes the The 555 Timer Design (NE555N). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these....
This small PCB, which I named Multiuse tiny1 was originally designed to convert NES/SNES controllers to USB. Since there is not a lot of space availabe inside an SNES controller, I designed the PCB to be as small as necessary. The PCB has improved since the....
12V to 3V convertor. This is an simple and cheap circuit to convert voltage from 12V to 3V.In fact this is a basic regulator circuit. The output voltage...
Most of the time a charged lead-acid battery and a power inverter would be used to ensure a smoothly organised holiday where ideally the missus and the children cheerfully use their electric and electronic gear! With rechargeable lead-acid batteries it`s....
Micro or analog? These days it is getting harder to choose. The 555 timer was the benchmark of flexibility. How does it fare today?...
AVR In System Programmer UK manufactured by Kanda who are a popular choice for AVR In System Programmer UK and AVR In System Programmer worldwide....
The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
The motion detector circuit consists of two components, the emitter and the sensor/detector. The emitter is simply made up of an infrared emitting diode reverse biased to a 5-volt source. The sensor uses the MRD821 to detect the IR beam from the emitter. It....
This is a very simple RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module (WZ-X01). Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy. The transmitter can be powered....
A simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the5 Voltavailable from the USB port. The 5V from the USB port is passed through current limiting resistor R2 and transistor Q1. The base of....
This article continues the AT90S4433 Microcontroller series. I suggest you to read the previous articles on Atmel Microcontroller programming with regards to: This time we design a frequency counter which can measure frequencies from 1Hz to 100MHz.....
This is a design for sawtooth generator circuit. The advantage of this circuit is low cost and produces an auxiliary square wave at the same frequency. This circuit can be used to sweep the frequency of another generator. This is the figure of the circuit. A....
This is a very simple lamp flasher circuit that uses only three components (a capacitor, relay and one resistor) other than the lamp. The working of the circuit is very straight forward. When the power is switched ON the capacitor C1 charges through the....
Here we provided several schematic drawings of battery charger circuit. These circuits covered 5W~200W NiCd, NIMH, Lead-Acid, and Li-Ion/Polymer, LiFePo4 battery packs. We hope chargers circuits files can help our users to select correct chargers also can....
Note, Q3 and Q4 in Figure below are complementary, NPN and PNP respectively. This circuit works well for moderate power audio amplifiers. For an explanation of this circuit see Direct coupled complementary-pair, Ch 4. ..
The circuit diagram of Radio Collar Transmitter has been described here. This circuit is based on the IC NE 555 which is the central part...
We can use boost converter such as TPS61160/1 with a 40V rated integrated switch FET to drive up to LEDs in series. We can use it to reduce output ripple,....
Current generated flows through clips placed on the earlobes Output current adjustable from 80 to 600 microAmperes Owing to the recent launching in Europe....
Building your own guitar foot pedal Would you like to try your hand at soldering Do you like point to point circuitry Would you like an overdrive pedal that will give you clean signal boost and smooth distortion Do you want to add a new pedal to your....
This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components. This circuit....
This circuit consists of two identical intercom units. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circuit. Only 2 wires are required to connect the units together. Due to the low output....
Walky-talky in this website is world first verified project made without using any coil range up to 500M circuit diagram of walky-talky with description walky-talky is communication ...
This article describes how to build a general purpose DTMF decoder with a low-price chip from MITEL. The circuit supports DTMF squelch based on 3 digits station ID (full 999 combination). It also supports decoding of 4 additional commands - station ID plus....
Two detector systems in the Hall-A spectrometers make use of potentially flammable gasses: the Vertical Drift Chambers (VDC) and the Focal Plane Polarimeter (FPP) straw tubes. This document is intended to address the practical need for a users manual for....
This circuit is an oscillator that generates a square wave. The op-amp starts with its two inputs in an unknown state; let`s say it starts with + slightly higher than. The op-amp greatly amplifies this difference, bringing its output to the op-amp`s positive....
Hi, I wanted to build an IR-transmitter-receiver system to send signals to a device . Let`s say the device is a simple blue LED (just to make life....
Ne555 is one of the most commonly used timer IC. It is a monolithic timing circuit that can produce accurate and highly stable time delays or oscillations. Like general purpose OP AMPs, it is very much reliable, easy to use and cheaper in cost. It has a....
