New Circuits Page 126
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This simple device allows two computers to share a single USB printer or some other USB device, such as an external flash drive, memory card reader or scanner. A rotary switch selects the PC that you wish to use with the USB device, while two LEDs indicate....
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This application note describes an application of the MAX2361 quadrature transmitter IC in the Korean PCS band (Tx = 1750-1780MHz)....
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This circuit automatically turns a motor cycle`s headlight on and off, independently of both the light and ignition switches, provided the battery is fully charged. The first stage uses the 22O resistor and ZD1 to hold transistor Q1 off while the motor is....
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This amplifier comes with high fidelity (Hi-Fi), high sensitivity, low power consumption and low distortion. It will be nice for your high fidelity sound system. :) Make a PCB in very easy steps. ! Create your PCB design using PCB designer software like....
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Whenever there is a need for battery-powered lighting, like for camping, solar powered cottages, cars, boats, planes, or emergency purposes, fluorescent lamps have a great appeal. Firstly, they are very much more efficient than glow lamps, so they produce....
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-
This power supply was designed for use with the ˜Simple hybrid amp published elsewhere in this issue. It is of course suitable for use in other applications as well. We ve used a cascade generator for the 170 V, a switch mode supply for the 16 V, a series....
-
I`m designing a circuit to drive a 4x7 segment display using a PIC. I`ve done this in the past without any drama. I would just use four pins to control each of the four digits (one each). I`d switch one digit on, wait a bit, turn it off, then switch the....
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-
A Transcutaneous Electrical Nerve Stimulation (TENS) device is, put bluntly, a machine for giving electric shocks. The author was prescribed such a device on loan by his orthopaedic specialist. The unit has a large number of programmes, of which he used only....
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-
-
If you want to make your robot sense the objects in it`s surroundings i suggest you to go for an ULTRASONIC sensor. Though the IR based sensors are cheep, their working range may vary due change in ambient light and won`t give accurate range values. In case....
-
Firecrackers are normally ignited by using a matchstick or a candle. You have to run away quickly after igniting the fuse of the firecracker. This method of igniting firecracker is unsafe, because the danger of the firecracker bursting before you reach a....
-
The transmitter on 2 meters 144 MHz was designed mainly for use by radio amateurs as radio beacon and to this end, it produces a signal of good quality and....
-
The USB(Universal Serial Bus) specification provides the ability and energy. This change highlights series and parallel connections of the past, allowing an increase in the number of devices that can use a Personal computer. This simple circuit USB charger....
-
Connect Relay with pic microcontroller and whenever I put Load on Relay`s Contacts PIC16f877a resets. I some time solve this problem by triggering another relay from basic relay attached to PIC. But this is not a solution. Can any one describes Why pic is....
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-
-
Now-a-days every institution needs automation. As a part of college automation, we have decided to do a project Voice Interactive System for College Automation . Our project allows the user to know the student`s attendance and marks quickly through the....
-
The air sampler is a highly effective multi-stage wetted-wall cyclone that continuously processes air at a 325 LPM rate, extracting particulates and transferring them to a liquid phase of 4 to 5 cc volume (see Figure 2). Distilled water is typically the....
-
To get a position control that are low cost, accurate and simple we can use stepper motor. To drive it we can use a circuit mounted close to the motor, and to....
-
-
A very simple frequency counter circuit is shown below and can be easily built by any electronic enthusisat for the intended purpose. The circuitdiagramwas provided by Mr. Kapital through an order in Fiverr. com, I was asked to explain the functioning by....
-
This article describes an amplifier Audison LR604XR principle. The principle is simple there, we recommend that combine text carefully read the complete schematic. To better grasp this principle, it is recommended to read several times on this principle. 1.....
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Digital clock project based on the PIC16C54 microcontroller can be designed using the following circuit diagram. This digital clock electronic project based on the PIC16C54 is a simple time-of-day clock incorporating four seven-segment LED displays and three....
-
The normal telephone bell, at times (specially during night when one does not want to be disturbed), appears to be quite irritating. The circuit shown here converts the loud sounding bell into a soft and pleasing musical tone....
-
This door open alarm electronic project is designed using an linear hall effect device and a 555 timer circuit. This door open alarm alarm electronic project is based on the TL3103 linear hall effect device used for detecting the angle of rotation. The....
-
This circuit uses the measurement of SIEMENS and UAA180 circuit of rectification of accuracy, around IC2B TL072. Calibration has been a 3dB steps from one another LED, make sure, a very good level of precision, the measurement of acoustic signals entering.....
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Power Supply in this article use a regulator that is composed of 2 pieces of NPN transistor. A transistor acts as a power regulator and a transistor again serves as a controller output voltage. Power Supply has an adjustable output with a range of 6-12 VDC.....
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-
Many electronic projects call for a timebase generator, accurate to a second or so. One way of producing this is with a microcontroller, quartz crystal and some software. But a far cheaper and simpler approach is to recycle an old analogue quartz clock.....
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he following circuit shows a Photo Alarm Electronic Circuit. This circuit based on the 555 Timer IC. Features: LDR ( photoresistive cell), ....
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This is a simple pulse generator circuit or standard astable oscillator circuit for IC 555 timer,NE555N IC. Use for....
-
The purpose of this page and its sub pages about members of Z80 family (and close relatives) is to collect and share information and good ideas. I know there are lots of people out there, who have developed some good utilities and hardware solutions. Now we....
-
-
The following schematic depicts the design of a 4 Watt Amplifier Circuit Diagram for portable radio application using TDA1011 from Philips Semiconductor. The....
-
SigmaTels STAC9721 STAC9723 is a general-purpose 18-bit stereo, full duplex, Audio CODEC that conforms to the Analog component specification of AC`97 (Audio Codec 97 Component Specification Rev. 2. 1). The STAC9721 STAC9723 incorporates SigmaTels proprietary....
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The IC8211 presents the voltage reference and regulator amplifier, although Q1 will probably be the series pass transistor. R1 defines the output current of the IC8211, although C1 and C2 present loop stability and as well act to suppress feedthrough of....
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With the quickening of the modern rhythm of life, the frequency happening in traffic accident is increasing too, in order to improve the safety that the car runs, this text introduces the mechanically controlled car anticollision alarm system of a one piece.....
-
In typical push-pull driver applications, the npn-pnp transistor pair is alternately turned on and off using a square-wave signal. A simple driver circuit uses an inverter between the V1 and V2 inputs to toggle the output transistors. However, mismatched....
-
I decided to make my own K9AY antenna system and controller. Basically, after looking at the currently available commercial version, I figured I could make a better unit for less money and be happy. The basis for the K9AY antenna is that it has a steerable....
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Another project started with three others not finished. What would my Dad say Well one thing he would say is, "Warn people that this project is under construction and has not been proved to work yet". You have been warned. I had to use a signal generator,....
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The following circuit is a schematic of mains surge suppressor circuit manufactured by StrG¶mfors and sold undel model name "Ahstrom Transienttisuoja 23 386". It is designed for protecting sensitive electronic devices agains overvoltage transients in normal....
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-
-
This report entails the details on the principles and operation of an amplifier known as the Wien Bridge Oscillator. This oscillator was designed as part of a laboratory exercise, which unfortunately I did not get to participate in, therefore, this write....
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FM Radio has a long history to its credit starting from its development in 1933. Today, FM Radio is an integral part of almost all mobile phones. In a common mobile phone, the cable to the earphone serves as the Antenna for FM reception, wherein the Antenna....
-
Convert a nice but ordinary chocolate box into a raging LED Blinking Inferno with ATTiny13 AVR chip, Arduino IDE and a handful of electronic components..
-
Electric motor start-run capacitor instructions: Use of air conditioner compressor motor starting capacitors Use of starting capacitors on electric motors for air conditioning, pumps, etc. Start or Run Capacitor Diagnostic Checks: How to Use a VOM or....
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This was actually used to program my Digital Voice Recorder which I made for my VI sem project. It connects to the Parallel port, and can be used to program any Atmel AVR while it is still in the system, provided the system provides a standard In System....
-
-
This is the square wave oscillator which used a CMOS-type logic inverters. I use the word "logic inverter" to avoid confusion with the DC/AC inverter. The output of the oscillator is connected with the drive circuit through the logic inverters. The antiphase....
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This is an actual reverse engineered circuit diagram of the one transistor circuit most commonly used to drive Permanent Magnet DC motors in childrens` toys. This type of circuit almost always uses the 625mW version of the ubiquitous 8050 or 8550 transistor.....
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Author Jim Walker describes a very low cost analog delay line circuit using parts such as the LM311 comparator and 74HC74 D flip-flop...
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The top MOSFET switches on creating a short circuit between the input voltage (IN) and the left hand side of the inductor, L1. The inductor current ramps up according to the equation where V is the voltage across the inductor, L is the inductance value and....
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The Physical interface bus being either fiber [Optical] or wire [electrical]. The difference here, in some cases, is that the electrical interface being defined resides just prior to the optical encoder. So the Physical interface bus from device to device is....
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Stand-alone, 9V battery powered unit, Three-level input selector, three-band tone control This preamplifier was designed as a stand-alone portable unit, u....
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A simple lab-psu using the lm317, based on the first schematic. to prevent damages to my dmm when measuring mA, i`d like to include a switchable current limiter. but i`m not sure if i understand those schematics and how i could integrate it. so here are my....
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I have designed a simple Electric Guitar SPICE Subcircuit that includes a Signal Generator 440Hz Sine Wave Output at 100mv. The Parameter ""440&quo....
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Here is a simple 3 band graphic equalizer circuit made of a single op amp IC LF351 (IC1) and few passive components. The component values of this circuit are not very critical and can be replaced with nearest values with a little loss on the performance.....
-
This is about as close as you can get to a real vintage Pultec EQP-1a. Built from the original Pulse Techniques Pultec schematic with the layout designed around modern replacement parts (filter caps and trannys); and utilizing best practices regarding lead....
-
This is a design circuit of audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage is that there is no need for the complication of a second (symmetric) power supply;....
-
In the event of combustible gas, the conductance of TGS308 gas sensor increases, and the voltage is removed through the potentiometer RP1 slide point, and its value is increased from normal 3V rms to 20V. This elevated voltage is added to transistor VT1....
-
-
PLL (Phase Locked Loop) can be used to make a FM demodulator. PLL circuit track the input frequency by controlling a voltage input of a VCO (Voltage-Controlled....
-
This is Simple Tone Oscillator Generator. It is use transistor 2N2222 and 2N2907 be main part. By control tone sound with R2 - 50K and use 8ohm size. Detail...
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This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is....
-
The project is a continuation of the 5kW Boost converter project. After a few failed attempts, I realized that I was really after more power, perhaps 10kW or so. I changed the title from 12kW to 8kW. While the converter is designed for 12kW, its very....
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The basic digital circuits are Flip Flop and Counter, both are here. This circuit can be cascaded to make even a 6 digit event counter, even a simple frequency counter can be made. These are best done with microcontrollers today. Then what if you have to....
-
The left hand side transistor T1 is rigged as a voltage comparator using a resistive network. The resistor at the upper arm is the LDR and the lower arm resistor is the preset which is used to set the threshold values or levels. T2 is arranged as an....
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The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the....
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The following circuit shows about Ultrasonic Sensor Switch circuit diagram. This circuit based on the 555 Timer IC for Ultrasonic Transmitter, and ....
-
Many excellent ISP (In System Programming) designs exist for 8 bit AVR microcontrollers. However, most require a pre-programmed microcontroller, or the "Chicken or Egg" problem: you can`t program microcontrollers unless you have one already programmed.....
-
This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser....
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When the telephone rings the line voltage rises to 72 volts. At this time the LED in the opto-coupler glows and the transistor conducts. Due to this the transistor Q1 conducts. This makes the relay ON. The load connected to the relay whether bulb or bell....
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The following circuit shows about Sensor Circuit Diagram Of Automatic Room Lights. This circuit based on the CD4017 IC. . Features: uses two LDRs, ....
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An ideal solution to harvest Solar energy for charging purpose. This charger can replenish almost all types of batteries including Mobile phone battery. It uses a Solar Module to convert light energy into electrical energy The circuit is self explanatory. A....
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The protected section of track can be as long or as short as desired and does not have to be the same length on both sides of the crossing. The circuit works in both directions and can be connected to other grade crossing circuits to provide fully automatic....
-
easy to build home made 50 Mhz (6-metres band) vertical half wave antenna! Omnidirectional, high gain, low SWR!....
-
Voltage is transformed by the transformer turns ratio N2/N1. For instance if 20VAC secondary voltage is required with 120VAC input, a 6:1 ratio would be needed. When full load current is drawn from the secondary winding, the voltage may drop from 5 to 25%,....
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It`s one of the simplest circuits to get working but one of the more tricky to understand. This simple two-transistor oscillator has a technical name of astable multivibrator and provides a squarewave (of sorts) output in and out of phase. First up, keep....
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This circuit may look simple, but that`s because I made considerable effort to simplify the circuit. It requires only a small amount of components and it has low current consumption (15 mA). From the left to the right, this circuit consists of a tranducer, a....
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Is an eight-way signal remote control selection circuit composed of ZHJ-9904 ; (B) is remote control transmitter circuit; (C) is the eight-way switch control circuit; (D) is remote control transmitter...
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Malcolm Moore`s schematic is good, but it`s not enough for a dangerous man with a soldering iron to do anything useful with. Namely, what is T1 A coil(s) of some type, but the configuration Also Q1, Q2 values ditto SCRs. I was intending to respond to your....
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The circuit is built around two 555 timer ICs. U1 and U2. U1 is wired as a variable duty cycle oscillator with a constant time period of around 0. 1 second. Duty cycle can be varied from 0 to 100 per cent by R4 potentiometer. The output of U1 (pin 3) is....
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We will use them to show current room temperature using a LM35 temperature sensor. Please note that this schematic is slightly different from our previous schematic on multiplexed seven segment display. The display select i/o pins were RA0, RA1, RA2, RA3 on....
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With the world`s non-renewable resources being consumed at an alarming rate, it`s no surprise that when the new curriculum was released, 2 ½ years ago, the word `environmental` appeared in the key concepts. The programme of study goes on to add that this....
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The capability to support multiple satellite positioning systems is increasingly a requirement for automotive navigation systems. The UMSZ2 Series GNSS module from ALPS Electric meets these requirements at a very compact form factor ..
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With this cool cat/dog repeller circuit you could chase the cats off from any where you want. In fact, I designed this circuit to chase my cat from my computer table. Most of the animals like cats respond violently to ultrasonic sound and in fact it`s the....
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The DTMF codec is the abbreviation of the dual-tone multi-frequency codec. The multiple-channel infrared remote control switch circuit which is composed of the DTMF is as shown in the figure. It is composed of the infrared remote control signal emitter, the....
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This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched....
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This simple device allows two computers to share a single USB printer or some other USB device, such as an external flash drive, memory card reader or scanner. A rotary switch selects the PC that you wish to use with the USB device, while two LEDs indicate....
This application note describes an application of the MAX2361 quadrature transmitter IC in the Korean PCS band (Tx = 1750-1780MHz)....
This circuit automatically turns a motor cycle`s headlight on and off, independently of both the light and ignition switches, provided the battery is fully charged. The first stage uses the 22O resistor and ZD1 to hold transistor Q1 off while the motor is....
This amplifier comes with high fidelity (Hi-Fi), high sensitivity, low power consumption and low distortion. It will be nice for your high fidelity sound system. :) Make a PCB in very easy steps. ! Create your PCB design using PCB designer software like....
Whenever there is a need for battery-powered lighting, like for camping, solar powered cottages, cars, boats, planes, or emergency purposes, fluorescent lamps have a great appeal. Firstly, they are very much more efficient than glow lamps, so they produce....
This power supply was designed for use with the ˜Simple hybrid amp published elsewhere in this issue. It is of course suitable for use in other applications as well. We ve used a cascade generator for the 170 V, a switch mode supply for the 16 V, a series....
I`m designing a circuit to drive a 4x7 segment display using a PIC. I`ve done this in the past without any drama. I would just use four pins to control each of the four digits (one each). I`d switch one digit on, wait a bit, turn it off, then switch the....
A Transcutaneous Electrical Nerve Stimulation (TENS) device is, put bluntly, a machine for giving electric shocks. The author was prescribed such a device on loan by his orthopaedic specialist. The unit has a large number of programmes, of which he used only....
If you want to make your robot sense the objects in it`s surroundings i suggest you to go for an ULTRASONIC sensor. Though the IR based sensors are cheep, their working range may vary due change in ambient light and won`t give accurate range values. In case....
Firecrackers are normally ignited by using a matchstick or a candle. You have to run away quickly after igniting the fuse of the firecracker. This method of igniting firecracker is unsafe, because the danger of the firecracker bursting before you reach a....
The transmitter on 2 meters 144 MHz was designed mainly for use by radio amateurs as radio beacon and to this end, it produces a signal of good quality and....
The USB(Universal Serial Bus) specification provides the ability and energy. This change highlights series and parallel connections of the past, allowing an increase in the number of devices that can use a Personal computer. This simple circuit USB charger....
Connect Relay with pic microcontroller and whenever I put Load on Relay`s Contacts PIC16f877a resets. I some time solve this problem by triggering another relay from basic relay attached to PIC. But this is not a solution. Can any one describes Why pic is....
Now-a-days every institution needs automation. As a part of college automation, we have decided to do a project Voice Interactive System for College Automation . Our project allows the user to know the student`s attendance and marks quickly through the....
The air sampler is a highly effective multi-stage wetted-wall cyclone that continuously processes air at a 325 LPM rate, extracting particulates and transferring them to a liquid phase of 4 to 5 cc volume (see Figure 2). Distilled water is typically the....
To get a position control that are low cost, accurate and simple we can use stepper motor. To drive it we can use a circuit mounted close to the motor, and to....
A very simple frequency counter circuit is shown below and can be easily built by any electronic enthusisat for the intended purpose. The circuitdiagramwas provided by Mr. Kapital through an order in Fiverr. com, I was asked to explain the functioning by....
This article describes an amplifier Audison LR604XR principle. The principle is simple there, we recommend that combine text carefully read the complete schematic. To better grasp this principle, it is recommended to read several times on this principle. 1.....
Digital clock project based on the PIC16C54 microcontroller can be designed using the following circuit diagram. This digital clock electronic project based on the PIC16C54 is a simple time-of-day clock incorporating four seven-segment LED displays and three....
The normal telephone bell, at times (specially during night when one does not want to be disturbed), appears to be quite irritating. The circuit shown here converts the loud sounding bell into a soft and pleasing musical tone....
This door open alarm electronic project is designed using an linear hall effect device and a 555 timer circuit. This door open alarm alarm electronic project is based on the TL3103 linear hall effect device used for detecting the angle of rotation. The....
This circuit uses the measurement of SIEMENS and UAA180 circuit of rectification of accuracy, around IC2B TL072. Calibration has been a 3dB steps from one another LED, make sure, a very good level of precision, the measurement of acoustic signals entering.....
Power Supply in this article use a regulator that is composed of 2 pieces of NPN transistor. A transistor acts as a power regulator and a transistor again serves as a controller output voltage. Power Supply has an adjustable output with a range of 6-12 VDC.....
Many electronic projects call for a timebase generator, accurate to a second or so. One way of producing this is with a microcontroller, quartz crystal and some software. But a far cheaper and simpler approach is to recycle an old analogue quartz clock.....
he following circuit shows a Photo Alarm Electronic Circuit. This circuit based on the 555 Timer IC. Features: LDR ( photoresistive cell), ....
This is a simple pulse generator circuit or standard astable oscillator circuit for IC 555 timer,NE555N IC. Use for....
The purpose of this page and its sub pages about members of Z80 family (and close relatives) is to collect and share information and good ideas. I know there are lots of people out there, who have developed some good utilities and hardware solutions. Now we....
The following schematic depicts the design of a 4 Watt Amplifier Circuit Diagram for portable radio application using TDA1011 from Philips Semiconductor. The....
SigmaTels STAC9721 STAC9723 is a general-purpose 18-bit stereo, full duplex, Audio CODEC that conforms to the Analog component specification of AC`97 (Audio Codec 97 Component Specification Rev. 2. 1). The STAC9721 STAC9723 incorporates SigmaTels proprietary....
The IC8211 presents the voltage reference and regulator amplifier, although Q1 will probably be the series pass transistor. R1 defines the output current of the IC8211, although C1 and C2 present loop stability and as well act to suppress feedthrough of....
With the quickening of the modern rhythm of life, the frequency happening in traffic accident is increasing too, in order to improve the safety that the car runs, this text introduces the mechanically controlled car anticollision alarm system of a one piece.....
In typical push-pull driver applications, the npn-pnp transistor pair is alternately turned on and off using a square-wave signal. A simple driver circuit uses an inverter between the V1 and V2 inputs to toggle the output transistors. However, mismatched....
I decided to make my own K9AY antenna system and controller. Basically, after looking at the currently available commercial version, I figured I could make a better unit for less money and be happy. The basis for the K9AY antenna is that it has a steerable....
Another project started with three others not finished. What would my Dad say Well one thing he would say is, "Warn people that this project is under construction and has not been proved to work yet". You have been warned. I had to use a signal generator,....
The following circuit is a schematic of mains surge suppressor circuit manufactured by StrG¶mfors and sold undel model name "Ahstrom Transienttisuoja 23 386". It is designed for protecting sensitive electronic devices agains overvoltage transients in normal....
This report entails the details on the principles and operation of an amplifier known as the Wien Bridge Oscillator. This oscillator was designed as part of a laboratory exercise, which unfortunately I did not get to participate in, therefore, this write....
FM Radio has a long history to its credit starting from its development in 1933. Today, FM Radio is an integral part of almost all mobile phones. In a common mobile phone, the cable to the earphone serves as the Antenna for FM reception, wherein the Antenna....
Convert a nice but ordinary chocolate box into a raging LED Blinking Inferno with ATTiny13 AVR chip, Arduino IDE and a handful of electronic components..
Electric motor start-run capacitor instructions: Use of air conditioner compressor motor starting capacitors Use of starting capacitors on electric motors for air conditioning, pumps, etc. Start or Run Capacitor Diagnostic Checks: How to Use a VOM or....
This was actually used to program my Digital Voice Recorder which I made for my VI sem project. It connects to the Parallel port, and can be used to program any Atmel AVR while it is still in the system, provided the system provides a standard In System....
This is the square wave oscillator which used a CMOS-type logic inverters. I use the word "logic inverter" to avoid confusion with the DC/AC inverter. The output of the oscillator is connected with the drive circuit through the logic inverters. The antiphase....
This is an actual reverse engineered circuit diagram of the one transistor circuit most commonly used to drive Permanent Magnet DC motors in childrens` toys. This type of circuit almost always uses the 625mW version of the ubiquitous 8050 or 8550 transistor.....
The top MOSFET switches on creating a short circuit between the input voltage (IN) and the left hand side of the inductor, L1. The inductor current ramps up according to the equation where V is the voltage across the inductor, L is the inductance value and....
The Physical interface bus being either fiber [Optical] or wire [electrical]. The difference here, in some cases, is that the electrical interface being defined resides just prior to the optical encoder. So the Physical interface bus from device to device is....
Stand-alone, 9V battery powered unit, Three-level input selector, three-band tone control This preamplifier was designed as a stand-alone portable unit, u....
A simple lab-psu using the lm317, based on the first schematic. to prevent damages to my dmm when measuring mA, i`d like to include a switchable current limiter. but i`m not sure if i understand those schematics and how i could integrate it. so here are my....
I have designed a simple Electric Guitar SPICE Subcircuit that includes a Signal Generator 440Hz Sine Wave Output at 100mv. The Parameter ""440&quo....
Here is a simple 3 band graphic equalizer circuit made of a single op amp IC LF351 (IC1) and few passive components. The component values of this circuit are not very critical and can be replaced with nearest values with a little loss on the performance.....
This is about as close as you can get to a real vintage Pultec EQP-1a. Built from the original Pulse Techniques Pultec schematic with the layout designed around modern replacement parts (filter caps and trannys); and utilizing best practices regarding lead....
This is a design circuit of audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage is that there is no need for the complication of a second (symmetric) power supply;....
In the event of combustible gas, the conductance of TGS308 gas sensor increases, and the voltage is removed through the potentiometer RP1 slide point, and its value is increased from normal 3V rms to 20V. This elevated voltage is added to transistor VT1....
PLL (Phase Locked Loop) can be used to make a FM demodulator. PLL circuit track the input frequency by controlling a voltage input of a VCO (Voltage-Controlled....
This is Simple Tone Oscillator Generator. It is use transistor 2N2222 and 2N2907 be main part. By control tone sound with R2 - 50K and use 8ohm size. Detail...
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is....
The project is a continuation of the 5kW Boost converter project. After a few failed attempts, I realized that I was really after more power, perhaps 10kW or so. I changed the title from 12kW to 8kW. While the converter is designed for 12kW, its very....
The basic digital circuits are Flip Flop and Counter, both are here. This circuit can be cascaded to make even a 6 digit event counter, even a simple frequency counter can be made. These are best done with microcontrollers today. Then what if you have to....
The left hand side transistor T1 is rigged as a voltage comparator using a resistive network. The resistor at the upper arm is the LDR and the lower arm resistor is the preset which is used to set the threshold values or levels. T2 is arranged as an....
The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the....
The following circuit shows about Ultrasonic Sensor Switch circuit diagram. This circuit based on the 555 Timer IC for Ultrasonic Transmitter, and ....
Many excellent ISP (In System Programming) designs exist for 8 bit AVR microcontrollers. However, most require a pre-programmed microcontroller, or the "Chicken or Egg" problem: you can`t program microcontrollers unless you have one already programmed.....
This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser....
When the telephone rings the line voltage rises to 72 volts. At this time the LED in the opto-coupler glows and the transistor conducts. Due to this the transistor Q1 conducts. This makes the relay ON. The load connected to the relay whether bulb or bell....
The following circuit shows about Sensor Circuit Diagram Of Automatic Room Lights. This circuit based on the CD4017 IC. . Features: uses two LDRs, ....
An ideal solution to harvest Solar energy for charging purpose. This charger can replenish almost all types of batteries including Mobile phone battery. It uses a Solar Module to convert light energy into electrical energy The circuit is self explanatory. A....
The protected section of track can be as long or as short as desired and does not have to be the same length on both sides of the crossing. The circuit works in both directions and can be connected to other grade crossing circuits to provide fully automatic....
easy to build home made 50 Mhz (6-metres band) vertical half wave antenna! Omnidirectional, high gain, low SWR!....
Voltage is transformed by the transformer turns ratio N2/N1. For instance if 20VAC secondary voltage is required with 120VAC input, a 6:1 ratio would be needed. When full load current is drawn from the secondary winding, the voltage may drop from 5 to 25%,....
It`s one of the simplest circuits to get working but one of the more tricky to understand. This simple two-transistor oscillator has a technical name of astable multivibrator and provides a squarewave (of sorts) output in and out of phase. First up, keep....
This circuit may look simple, but that`s because I made considerable effort to simplify the circuit. It requires only a small amount of components and it has low current consumption (15 mA). From the left to the right, this circuit consists of a tranducer, a....
Is an eight-way signal remote control selection circuit composed of ZHJ-9904 ; (B) is remote control transmitter circuit; (C) is the eight-way switch control circuit; (D) is remote control transmitter...
Malcolm Moore`s schematic is good, but it`s not enough for a dangerous man with a soldering iron to do anything useful with. Namely, what is T1 A coil(s) of some type, but the configuration Also Q1, Q2 values ditto SCRs. I was intending to respond to your....
The circuit is built around two 555 timer ICs. U1 and U2. U1 is wired as a variable duty cycle oscillator with a constant time period of around 0. 1 second. Duty cycle can be varied from 0 to 100 per cent by R4 potentiometer. The output of U1 (pin 3) is....
We will use them to show current room temperature using a LM35 temperature sensor. Please note that this schematic is slightly different from our previous schematic on multiplexed seven segment display. The display select i/o pins were RA0, RA1, RA2, RA3 on....
With the world`s non-renewable resources being consumed at an alarming rate, it`s no surprise that when the new curriculum was released, 2 ½ years ago, the word `environmental` appeared in the key concepts. The programme of study goes on to add that this....
The capability to support multiple satellite positioning systems is increasingly a requirement for automotive navigation systems. The UMSZ2 Series GNSS module from ALPS Electric meets these requirements at a very compact form factor ..
With this cool cat/dog repeller circuit you could chase the cats off from any where you want. In fact, I designed this circuit to chase my cat from my computer table. Most of the animals like cats respond violently to ultrasonic sound and in fact it`s the....
The DTMF codec is the abbreviation of the dual-tone multi-frequency codec. The multiple-channel infrared remote control switch circuit which is composed of the DTMF is as shown in the figure. It is composed of the infrared remote control signal emitter, the....
This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched....
