New Circuits Page 158
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This circuit is designed to switch on/off any home or industrial appliance by using the TV/DVD remote controller. The circuit can be operated up to a dist....
-
-
This circuit is a motion detection sensor, this circuit uses a light source and detector as a sensor infrared motion detector. Motion sensor using infrared LED and phototransistor. Because it uses light to the sensor sensitivity can be affected by....
-
I designed a 8x8-bit memory module using LogicSim, a shareware software program that allows people to create logic diagrams and run a simulation using that design. The memory module I created uses 688 logic gates. There are couple layers of abstraction in....
-
-
4 Channel Infrared (IR) Remote is a simple kit using the famous HT12A and HT12D encoder / decoder chips from Holtek...
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-
-
Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transi...
-
A power supply circuit for sega game gear for the additional collection of your circuit. For a more complete explanation can be found on the website..
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Here is a simple but effective burglar alarm circuit that can be fixed on windows to detect break throughs. The circuit uses a fine wire element fixed as a network through the window glass for sensing the break through. Normally the base of Q1 is held to....
-
This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a co....
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This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source....
-
-
The heart of the circuit is the two transistor flasher with frequency modulation applied to the base of the first transistor. When the pushbutton is depressed, the frequency of oscillation climbs to a peak and when the button is released, the frequency....
-
The hobby circuit below can be connected to a 3v battery, to give you some warning when the battery is nearing its end of life. It will flash a LED when the battery voltage drops to about 2. 4 volts. The electronic circuit draws only 1ua of current in....
-
The objective of this project is to make a controller based model to count number of persons visiting particular room and accordingly light up the room. Here we can use sensor and can know present number of persons. In today`s world, there is a continuous....
-
This PC fan controller circuit is designed with discrete components and is used to control 12 V fans that have a current consumption lower than 200mA. With the components values presented in the circuit diagram, the voltage won`t drop below 7V. If the fan....
-
LED displays are nothing more than sets of Light Emitting Diodes. The difference is that they have different shapes in order to display specific information. So driving LED displays is the same as regular LEDs. This is simple connection when there are enough....
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-
-
A 40 watt fluorescent tube lamp or two 20-watt tubes in series will be driven by this circuit but this circuit will produce less brightness than usual, since....
-
This mini-VOX voice operated relay is based on a circuit published in Silicon Chip, 9/1994, p31. The off delay time may be adjusted by varying R3 and R4. Reducing R3 will result in a longer release time. You could change the release time constant (C2 & R5)....
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Infrared burglar alarm circuit schematic is shown in Figure 1. Infrared transmitter is a multivibrator with oscillation frequency being 40kHz, and it is composed of IC2 ( NE555 ), R1, R2 and C3. VLS is the infrared emission probe which can be used to radiate....
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-
Timers are widely used in industrial and domestic application for automating tasks. Microcontrollers can be used to design versatile and accurate timers with...
-
Ahigh voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc. Such a power supply could also be used for protection of property by electric charging of....
-
Owing to the recent launching in Europe of Cranial Electrotherapy Stimulation (CES) portable sets, we have been "Electronically Stimulated" in designing a similar circuit for the sake of hobbyists. CES is the most popular technique for electrically boosting....
-
The following circuit shows about CD4017 IC For Automatic Room Lights Sensor Circuit Diagram. Features: has only one light sensor, using two LDRs ....
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Originally Posted by artosalo My original claim was that pentode connected version is not optimum. NO! You wrote the Mullard 5-10 is not optimum. If....
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Using analog audio line delay, you can adjust your room virtually. Just turn a knob in your audio set and you can adjust your room size. The circuit described here will make your dream come true, giving a feel that your speaker is located 15 meters behind....
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actually i wanted to know about the female connector used in PC for connecting the speaker. i hope u got it. i wanted to know the pin connections of the jacks. i shall show u the circuit for the audio coupling of the PC to telephone line. also please suggest....
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Home-made antennas can greatly improve the performance of AM and FM radios, short-wave receivers, and scanners. If you are a talk-radio fan then experiment with the AM band antennas and you will be able to hear shows from all over the country with surprising....
-
-
Bicycle sensors provide two main purposes: to record the motion of the bicycle in order to assist with collision reconstruction, and to relay signals to the bicycle controls to keep the bicycle on course. This will pose several component requirements, as the....
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This document provides details on using the ATA6833-DK for BLDC Motor Control applications. The BLDC Motor Control Kit consists of two boards: Basic board with a BLDC Gate Driver SBC (System Basis Chip) ATA6833 ATA6834 and external MOSFETs Controller board....
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This is the circuit of a low power LED night lamp that will automatically switch OFF at day time. The CMOS timer IC TS555CN is wired as a square wave generator operating at around 5Hz. The output voltage from the IC1 is doubled using the combination of....
-
-
A car stereo amplifier circuit that can be used in automobiles, designed using Class-B audio amplifier TDA1553, with circuit diagram and schematics....
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Laptop Schematic Circuit Diagram for Laptop Repair, Laptop Bios Password Remove...
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-
If you ever look at construction notes for building old detector type radios the type of headphones specified always have an impedance of 2 G— 2000. Nowadays the most commonly available headphones have an impedance of 2 G— 32 , this relatively low value....
-
It`s based on an LM2917 and an SCR, which has the very nice side effect of being impossible to generate any mis-timed sparks, a highly desirable attribute for high output rotary engines. When the limit is reached by accelerating to the rev limit, the....
-
A 30 to 50 cm whip antenna provides reception from 10 MHz to over 220 MHz. T1 BF981, a dual-gate MOSFET, provides low noise, high-input impedance and high....
-
The design is a clone of Steve Ward`s MiniSSTC circuit; the schematic is reprinted here with credits to Steve Ward: 9schem. jpg. This circuit performs very well for a low power and simple SSTC. My design is based on Steve`s final revised circuit that employs....
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Minuscule circuit of the electric AC heater controller presented here is built around the renowned 3-Pin Integrated Temperature Sensor LM35 (IC1) from NSC ..
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The circuit comprises two sections: charger power supply and LED driver. The charger power supply section is built around 3-terminal adjustable regulator (IC1) LM317, while the LED driver section is built around transistor BD140(T2). In the charger power....
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The schematic for this project really only consists of adding a single 5mm LED to one digital output port on the Arduino. The picture below should be fairly self explanatory for how to do it. The main parts in the schematic are the Arduino Uno, 5mm LED and....
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The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these....
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This is a Preselector for SW receivers (diy hf preselector) circuit. The entry low capacitance of MOSFET modern, with two gates, will create negative inverse reaction through a uncoupled source resistor. Applied right this technique allows the creation of a....
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-
The four main input channels are identical, have independently adjustable input sensitivity, tone, panning sound. The fifth entry - linear channel. Despite the cheap and primitive, the work Mini Audio Mixer "Impulse MM-04" was quite satisfactory ..
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-
In some video applications, the signal sources deliver RGB signals and a composite sync signal. The RGB signals contain no video sync. At the receiver side, some low-cost video decoders do not have a stand-alone composite sync input; they only accept the....
-
There are a lot of alarm systems on the market but you might be inclined to build your own. This little project can be put together using inexpensive parts readily available. The alarm transmitter module allows for a delayed trigger and auto turn-off as it....
-
This circuit generates inaudible ultrasound to make a barrier across the entry. At the moment the circuit detects a break in the sound barrier, it generates a loud alarm indicating the entry of a person. This can be used to protects the entry passages and....
-
When I purchased the salve dial, it came with no instructions, packaging or other details. The only markings (other than five decades of grime) were those on the face (SMITH SECTRIC, ACELEC SYDNEY), and some markings on bracket holding the mechanism together....
-
-
Any step-down DC-DC converter can be used as an inverter with no changes to the operating schematic. The only differences between the normal step-down application and inverting operation are the labels of the connection points. The step-down VOUT is....
-
The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit diagram and power....
-
The charging circuit stops automatically when the battery is fully charged. So you can leave the emergency light connected to AC mains overnight without any fear. The circuit can be divided into inverter and charger sections. The inverter section is built....
-
This circuit consists of a UJT oscillator in which the timing charge capacitor C2 is linearly dependent on the input sigoal voltage. The charging current is set by the voltage across resistor R5. which is accurately controlled by the amplifier..
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A small power amplifier, but with very good quality of sound. It combines a completed very good quality (NE5534), that has the possibility of control of low loads, high speed, low distortion and two transistors of technology v-mosfet in the exit....
-
Here is the circuit diagram of a super bright LED night lamp that can be operated from the mains supply. Bridge D1 is used to rectify the AC mains voltage. The capacitor C1 and resistor R1 forms the current limiting circuit. 10 ultra bright white LEDs are....
-
This adaptor circuit is essentially a 100mA constant current source. It is applied across a low-value resistor of unknown value (ie, the resistance to be measured) and the resulting voltage drop can then be measured by a digital multimeter (DMM). Setting....
-
Control a car toy. The toy car is controlled via a controller that is connected to it via a wire, so it`s not radio controlled. I would like to use relays to control toy via parallel port. I think there are many relay types and models, and I would like to....
-
This project introduces important type of transducer, an optical coupler. An optical coupler together with a square wave generator and counters can be used to construct a timer for appliances. That is, an appliance can be turned on at a desired time for a....
-
Early schematic of a Colpitts circuit, using a vacuum tube, redrawn from the patent publication. A Colpitts oscillator, invented in 1920 by American engineer Edwin H. Colpitts, is one of a number of designs for electron....
-
The cheap flashlight had a rather small (0. 22 Farad) capacitor for energy storage - not very much energy, really, approximately 6. 6 Joules maximum or less than 1/1000th of what a single AA alkaline cell contains! Being a standard "super cap" its internal....
-
This voltage to frequency converter (VFC) circuit uses 555 IC and 741 op-amp as the main components. Up to 20kHz oscillation can be produced by this circuit..
-
This is the sequence timer diagram composed by NE555. The timer can set time any time when the power is connected, break and control the external system to work. In the circuit, K1-K3 are relays used to control the corresponding system to work, adjust the....
-
The TINAH board shield, a printed circuit-board shield designed and built for Phys253 and first used in 2009 by Engineering Physics students and staff. The shield acts as a buffer for protecting the digital and analog inputs and outputs of the Wiring....
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-
-
-
One of the most insidious problems in an audio system is one or more ground loops. They not only cause hum pickup, they can inject interference from electric drills, computer hardware and even AM radio stations. Eliminating them is often not a trivial....
-
Linear whether three phases step down voltage regulation power control unit of the switch synchronously in LTC3731H of Company, can drive connecting the power N-MOSFET of all, specified the intersection of operating temperature and up to 140 the intersection....
-
Current regulator acts like a load when connected to a voltage source, or in series between voltage source and real load. The main characteristic of a current....
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-
-
This article means to utilize your old PC to be come a simple controller. Many old PC like 8088 type, 8086, 80286, 80386, or even 80486 already become an obsolete systems, since they can not run many new program now a days. In fact, this system still also....
-
A simple liquid level switch circuit with diagram and schematic.This can also be used as water level switch,fluid level,float level and tank level switch....
-
This is a design circuit for a doorbell. This circuit can produces a sound like bird sound. This circuit controlled by transistor NPN. This is the figure of the circuit. The operation of the circuit is beginning when P1 is of experimental value. Start with....
-
There are two types of preamplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SIL....
-
This tremolo effect circuit uses the XR2206 and the TCA730 IC which is designed as an electronic balance and volume regulator with frequency correction. The circuit is usefull for stereo channels and it also has the ability to simulate the Lesley effect aka....
-
This circuit converts the ripple from a wall wart supply to a clean Line x 2 digitial clock. Doing it this way eliminates the need to put AC into the unit which then has to be rectified and filtered just to have access to the line frequency sine wave...
-
Amplifier circuit for electret microphones (condenser microphones). Amplifier the audio signals picked up by the electret microphone, using 741 op-amp and a 2N2222 transistor....
-
The headlights and photo cells will face the ground, so I find it easiest to imagine that the whole circuit is upside down Why 3 LEDs per side As far as I can tell, because you can`t power three in series from a single 9V battery without a little help, and....
-
The light sources for mirror screws based on my work, consist of a dozen or more of high brightness LEDs, in colors or white, typically connected in parallel or series-parallel. Shown here are two amplifiers, capable of handling the full range of video....
-
The ASUS Eee is a fantastic ultra-portable notebook with almost everything required for geeks (and nothing that isn t). Plus it features fantastic build q....
-
-
18W Audio Amplifier. High Quality very simple unit -- No need for a preamplifier Circuit diagram: Amplifier parts: P1 = 22K Log.Potentiometer...
-
This PIC microcontroller EEPROM project saves the temperature from an LM35DZ IC to the PIC`s internal long term data storage area. The project follows on from the last project using the virtually the same hardware. It stores temperature readings internally....
-
This dc voltage doubler circuit produces a voltage that is twice its voltage supply. This is useful when a higher voltage level is needed out of a single l...
-
-
Most people don`t know it, but there are usually over a dozen, battery backup systems in your home already. The average American around 18 battery backed up devices in their home. These battery backup systems backup the crucial, expensive, or mobile....
-
In order to measure the temperature without using the thermometer, thermocouples are the option to do so. However, the thermocouples need a reference temperature(normally take 0°C ) as to detect the difference of the temperature in between the materials of....
-
-
This circuit is for a temperature controlled constant current battery charger. It works with NICD, NIMH, and other rechargeable cells. The circuit works on the principle that most rechargeable batteries show an increase in temperature when the cells becomes....
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An old nonfunctional DVD player donated by the Engineering Department was gutted to provide an appropriate enclosure for the audio amplifier. To mount the nearly 16 lb toroidal transformer and 2in diameter filter capacitors, various sheet metal braces were....
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This voltage to frequency converter is designed to be connected to a frequency counter to display the voltage value being measured. This converter-counter combination produces a cheap but functionally complete digital voltmeter. The circuit delivers TTL....
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Unlike many units, this battery charger continuously charges at maximum current, tapering off only near full battery voltage. In this unit, the full load current of the supply transformer/rectifier section was 4.4A. It tapers off to 4A at 13.5V, 3A at 14.0V,....
This circuit is designed to switch on/off any home or industrial appliance by using the TV/DVD remote controller. The circuit can be operated up to a dist....
This circuit is a motion detection sensor, this circuit uses a light source and detector as a sensor infrared motion detector. Motion sensor using infrared LED and phototransistor. Because it uses light to the sensor sensitivity can be affected by....
I designed a 8x8-bit memory module using LogicSim, a shareware software program that allows people to create logic diagrams and run a simulation using that design. The memory module I created uses 688 logic gates. There are couple layers of abstraction in....
4 Channel Infrared (IR) Remote is a simple kit using the famous HT12A and HT12D encoder / decoder chips from Holtek...
Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transi...
A power supply circuit for sega game gear for the additional collection of your circuit. For a more complete explanation can be found on the website..
Here is a simple but effective burglar alarm circuit that can be fixed on windows to detect break throughs. The circuit uses a fine wire element fixed as a network through the window glass for sensing the break through. Normally the base of Q1 is held to....
This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a co....
This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source....
The heart of the circuit is the two transistor flasher with frequency modulation applied to the base of the first transistor. When the pushbutton is depressed, the frequency of oscillation climbs to a peak and when the button is released, the frequency....
The hobby circuit below can be connected to a 3v battery, to give you some warning when the battery is nearing its end of life. It will flash a LED when the battery voltage drops to about 2. 4 volts. The electronic circuit draws only 1ua of current in....
The objective of this project is to make a controller based model to count number of persons visiting particular room and accordingly light up the room. Here we can use sensor and can know present number of persons. In today`s world, there is a continuous....
This PC fan controller circuit is designed with discrete components and is used to control 12 V fans that have a current consumption lower than 200mA. With the components values presented in the circuit diagram, the voltage won`t drop below 7V. If the fan....
LED displays are nothing more than sets of Light Emitting Diodes. The difference is that they have different shapes in order to display specific information. So driving LED displays is the same as regular LEDs. This is simple connection when there are enough....
A 40 watt fluorescent tube lamp or two 20-watt tubes in series will be driven by this circuit but this circuit will produce less brightness than usual, since....
This mini-VOX voice operated relay is based on a circuit published in Silicon Chip, 9/1994, p31. The off delay time may be adjusted by varying R3 and R4. Reducing R3 will result in a longer release time. You could change the release time constant (C2 & R5)....
Infrared burglar alarm circuit schematic is shown in Figure 1. Infrared transmitter is a multivibrator with oscillation frequency being 40kHz, and it is composed of IC2 ( NE555 ), R1, R2 and C3. VLS is the infrared emission probe which can be used to radiate....
Timers are widely used in industrial and domestic application for automating tasks. Microcontrollers can be used to design versatile and accurate timers with...
Ahigh voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc. Such a power supply could also be used for protection of property by electric charging of....
Owing to the recent launching in Europe of Cranial Electrotherapy Stimulation (CES) portable sets, we have been "Electronically Stimulated" in designing a similar circuit for the sake of hobbyists. CES is the most popular technique for electrically boosting....
The following circuit shows about CD4017 IC For Automatic Room Lights Sensor Circuit Diagram. Features: has only one light sensor, using two LDRs ....
Originally Posted by artosalo My original claim was that pentode connected version is not optimum. NO! You wrote the Mullard 5-10 is not optimum. If....
Using analog audio line delay, you can adjust your room virtually. Just turn a knob in your audio set and you can adjust your room size. The circuit described here will make your dream come true, giving a feel that your speaker is located 15 meters behind....
actually i wanted to know about the female connector used in PC for connecting the speaker. i hope u got it. i wanted to know the pin connections of the jacks. i shall show u the circuit for the audio coupling of the PC to telephone line. also please suggest....
Home-made antennas can greatly improve the performance of AM and FM radios, short-wave receivers, and scanners. If you are a talk-radio fan then experiment with the AM band antennas and you will be able to hear shows from all over the country with surprising....
Bicycle sensors provide two main purposes: to record the motion of the bicycle in order to assist with collision reconstruction, and to relay signals to the bicycle controls to keep the bicycle on course. This will pose several component requirements, as the....
This document provides details on using the ATA6833-DK for BLDC Motor Control applications. The BLDC Motor Control Kit consists of two boards: Basic board with a BLDC Gate Driver SBC (System Basis Chip) ATA6833 ATA6834 and external MOSFETs Controller board....
This is the circuit of a low power LED night lamp that will automatically switch OFF at day time. The CMOS timer IC TS555CN is wired as a square wave generator operating at around 5Hz. The output voltage from the IC1 is doubled using the combination of....
A car stereo amplifier circuit that can be used in automobiles, designed using Class-B audio amplifier TDA1553, with circuit diagram and schematics....
Laptop Schematic Circuit Diagram for Laptop Repair, Laptop Bios Password Remove...
If you ever look at construction notes for building old detector type radios the type of headphones specified always have an impedance of 2 G— 2000. Nowadays the most commonly available headphones have an impedance of 2 G— 32 , this relatively low value....
It`s based on an LM2917 and an SCR, which has the very nice side effect of being impossible to generate any mis-timed sparks, a highly desirable attribute for high output rotary engines. When the limit is reached by accelerating to the rev limit, the....
A 30 to 50 cm whip antenna provides reception from 10 MHz to over 220 MHz. T1 BF981, a dual-gate MOSFET, provides low noise, high-input impedance and high....
The design is a clone of Steve Ward`s MiniSSTC circuit; the schematic is reprinted here with credits to Steve Ward: 9schem. jpg. This circuit performs very well for a low power and simple SSTC. My design is based on Steve`s final revised circuit that employs....
Minuscule circuit of the electric AC heater controller presented here is built around the renowned 3-Pin Integrated Temperature Sensor LM35 (IC1) from NSC ..
The circuit comprises two sections: charger power supply and LED driver. The charger power supply section is built around 3-terminal adjustable regulator (IC1) LM317, while the LED driver section is built around transistor BD140(T2). In the charger power....
The schematic for this project really only consists of adding a single 5mm LED to one digital output port on the Arduino. The picture below should be fairly self explanatory for how to do it. The main parts in the schematic are the Arduino Uno, 5mm LED and....
The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these....
This is a Preselector for SW receivers (diy hf preselector) circuit. The entry low capacitance of MOSFET modern, with two gates, will create negative inverse reaction through a uncoupled source resistor. Applied right this technique allows the creation of a....
The four main input channels are identical, have independently adjustable input sensitivity, tone, panning sound. The fifth entry - linear channel. Despite the cheap and primitive, the work Mini Audio Mixer "Impulse MM-04" was quite satisfactory ..
In some video applications, the signal sources deliver RGB signals and a composite sync signal. The RGB signals contain no video sync. At the receiver side, some low-cost video decoders do not have a stand-alone composite sync input; they only accept the....
There are a lot of alarm systems on the market but you might be inclined to build your own. This little project can be put together using inexpensive parts readily available. The alarm transmitter module allows for a delayed trigger and auto turn-off as it....
This circuit generates inaudible ultrasound to make a barrier across the entry. At the moment the circuit detects a break in the sound barrier, it generates a loud alarm indicating the entry of a person. This can be used to protects the entry passages and....
When I purchased the salve dial, it came with no instructions, packaging or other details. The only markings (other than five decades of grime) were those on the face (SMITH SECTRIC, ACELEC SYDNEY), and some markings on bracket holding the mechanism together....
Any step-down DC-DC converter can be used as an inverter with no changes to the operating schematic. The only differences between the normal step-down application and inverting operation are the labels of the connection points. The step-down VOUT is....
The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit diagram and power....
The charging circuit stops automatically when the battery is fully charged. So you can leave the emergency light connected to AC mains overnight without any fear. The circuit can be divided into inverter and charger sections. The inverter section is built....
This circuit consists of a UJT oscillator in which the timing charge capacitor C2 is linearly dependent on the input sigoal voltage. The charging current is set by the voltage across resistor R5. which is accurately controlled by the amplifier..
A small power amplifier, but with very good quality of sound. It combines a completed very good quality (NE5534), that has the possibility of control of low loads, high speed, low distortion and two transistors of technology v-mosfet in the exit....
Here is the circuit diagram of a super bright LED night lamp that can be operated from the mains supply. Bridge D1 is used to rectify the AC mains voltage. The capacitor C1 and resistor R1 forms the current limiting circuit. 10 ultra bright white LEDs are....
This adaptor circuit is essentially a 100mA constant current source. It is applied across a low-value resistor of unknown value (ie, the resistance to be measured) and the resulting voltage drop can then be measured by a digital multimeter (DMM). Setting....
Control a car toy. The toy car is controlled via a controller that is connected to it via a wire, so it`s not radio controlled. I would like to use relays to control toy via parallel port. I think there are many relay types and models, and I would like to....
This project introduces important type of transducer, an optical coupler. An optical coupler together with a square wave generator and counters can be used to construct a timer for appliances. That is, an appliance can be turned on at a desired time for a....
Early schematic of a Colpitts circuit, using a vacuum tube, redrawn from the patent publication. A Colpitts oscillator, invented in 1920 by American engineer Edwin H. Colpitts, is one of a number of designs for electron....
The cheap flashlight had a rather small (0. 22 Farad) capacitor for energy storage - not very much energy, really, approximately 6. 6 Joules maximum or less than 1/1000th of what a single AA alkaline cell contains! Being a standard "super cap" its internal....
This voltage to frequency converter (VFC) circuit uses 555 IC and 741 op-amp as the main components. Up to 20kHz oscillation can be produced by this circuit..
This is the sequence timer diagram composed by NE555. The timer can set time any time when the power is connected, break and control the external system to work. In the circuit, K1-K3 are relays used to control the corresponding system to work, adjust the....
The TINAH board shield, a printed circuit-board shield designed and built for Phys253 and first used in 2009 by Engineering Physics students and staff. The shield acts as a buffer for protecting the digital and analog inputs and outputs of the Wiring....
One of the most insidious problems in an audio system is one or more ground loops. They not only cause hum pickup, they can inject interference from electric drills, computer hardware and even AM radio stations. Eliminating them is often not a trivial....
Linear whether three phases step down voltage regulation power control unit of the switch synchronously in LTC3731H of Company, can drive connecting the power N-MOSFET of all, specified the intersection of operating temperature and up to 140 the intersection....
Current regulator acts like a load when connected to a voltage source, or in series between voltage source and real load. The main characteristic of a current....
This article means to utilize your old PC to be come a simple controller. Many old PC like 8088 type, 8086, 80286, 80386, or even 80486 already become an obsolete systems, since they can not run many new program now a days. In fact, this system still also....
A simple liquid level switch circuit with diagram and schematic.This can also be used as water level switch,fluid level,float level and tank level switch....
This is a design circuit for a doorbell. This circuit can produces a sound like bird sound. This circuit controlled by transistor NPN. This is the figure of the circuit. The operation of the circuit is beginning when P1 is of experimental value. Start with....
There are two types of preamplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SIL....
This tremolo effect circuit uses the XR2206 and the TCA730 IC which is designed as an electronic balance and volume regulator with frequency correction. The circuit is usefull for stereo channels and it also has the ability to simulate the Lesley effect aka....
This circuit converts the ripple from a wall wart supply to a clean Line x 2 digitial clock. Doing it this way eliminates the need to put AC into the unit which then has to be rectified and filtered just to have access to the line frequency sine wave...
Amplifier circuit for electret microphones (condenser microphones). Amplifier the audio signals picked up by the electret microphone, using 741 op-amp and a 2N2222 transistor....
The headlights and photo cells will face the ground, so I find it easiest to imagine that the whole circuit is upside down Why 3 LEDs per side As far as I can tell, because you can`t power three in series from a single 9V battery without a little help, and....
The light sources for mirror screws based on my work, consist of a dozen or more of high brightness LEDs, in colors or white, typically connected in parallel or series-parallel. Shown here are two amplifiers, capable of handling the full range of video....
The ASUS Eee is a fantastic ultra-portable notebook with almost everything required for geeks (and nothing that isn t). Plus it features fantastic build q....
18W Audio Amplifier. High Quality very simple unit -- No need for a preamplifier Circuit diagram: Amplifier parts: P1 = 22K Log.Potentiometer...
This PIC microcontroller EEPROM project saves the temperature from an LM35DZ IC to the PIC`s internal long term data storage area. The project follows on from the last project using the virtually the same hardware. It stores temperature readings internally....
This dc voltage doubler circuit produces a voltage that is twice its voltage supply. This is useful when a higher voltage level is needed out of a single l...
Most people don`t know it, but there are usually over a dozen, battery backup systems in your home already. The average American around 18 battery backed up devices in their home. These battery backup systems backup the crucial, expensive, or mobile....
In order to measure the temperature without using the thermometer, thermocouples are the option to do so. However, the thermocouples need a reference temperature(normally take 0°C ) as to detect the difference of the temperature in between the materials of....
This circuit is for a temperature controlled constant current battery charger. It works with NICD, NIMH, and other rechargeable cells. The circuit works on the principle that most rechargeable batteries show an increase in temperature when the cells becomes....
An old nonfunctional DVD player donated by the Engineering Department was gutted to provide an appropriate enclosure for the audio amplifier. To mount the nearly 16 lb toroidal transformer and 2in diameter filter capacitors, various sheet metal braces were....
This voltage to frequency converter is designed to be connected to a frequency counter to display the voltage value being measured. This converter-counter combination produces a cheap but functionally complete digital voltmeter. The circuit delivers TTL....
Unlike many units, this battery charger continuously charges at maximum current, tapering off only near full battery voltage. In this unit, the full load current of the supply transformer/rectifier section was 4.4A. It tapers off to 4A at 13.5V, 3A at 14.0V,....
