New Circuits Page 72
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nokia 5130 keypad jumper just follow the diagram.. tested just now.. after doing the jumper.. all keypads working well ....
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Most of the telephone security devices available in market are simple but quite expensive. These devices provide blinking or beeping type line-tap/misuse indications. Quite often they do not offer guaranteed protection against unauthorized operation. A very....
-
-
-
This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around a standard reflective opto-sensor CNY70(IC1). In some disciplines, a line following robot or an....
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-
Another way other than magnetic reed switches for the alarm trip switch. The circuit needs the switch to be normally closed / held open (when the door is shut. ). I was looking to use a normally closed momentary push button. Another thought was trying to....
-
One example of the phase shift oscillator is Bubba oscillator. This oscillator gets 45 degree phase shift for each section from quad op-amp package. The....
-
This is an area that is dominated by commercial information resellers. One outstanding exception is Nostalgia Air, which has a growing data base of radio schematics. Some of the links here point to Nostalgia Air `s database, but if you can`t find it here,....
-
The circuit diagram shown here is a simple circuit DC power delay, which is based on an SCR (Silicon-Controlled Rectifier). This circuit is very useful and can be used in many applications. The operation of this circuit is very simple. When input power is....
-
-
This is scircuit which I built to one of audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is wait around....
-
-
-
This example shows how to make use of the Watchdog and Sleep functions provided by the ATMEGA 168 chip. These functions are useful if you want to build low power consuming devices operated by battery or solar power. The reduced power consumption is achieved....
-
This single transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most o....
-
This is a high-speed control scheme LED display screen circuit theory. Adopt the MCS51 series one-chip computer to control LED display screen; The random access memory 62512 is used as the data storage of LED display screen, store the matrix data waiting to....
-
This is necessary to set the 10K potentiometer while pointing the device at your TV to block the IR rays from the remote. This can be done by trial and error..
-
Difficult to observe in order to solve the leaning phase in adjusting the electric transmission line manually, record and difficult and normalizing three major difficult problems this difficultly. This design passes the design of the software and hardware,....
-
BEAMSonics is a clever little circuit designed by Wilf Rigter. It`s central function is to filter incoming sounds and count high pitched pulses, whistles, beeps etc. When it hears a certain number of beeps it will respond with a noise of its own. If left on....
-
The Spartan-3 board has eight LED Connected with FPGA I/O pins (details tabulated below). The cathode of each LED connects to ground via a 330 © resistor. To light an individual LED, drive the associated FPGA control signal to High...
-
Logic indicator circuit / logic probe is used to identify logic level at any point of logic circuitry. The indicator can be visual (using LED, LCD, of 7...
-
This is a 12V 100mA Transformerless power supply in support of low current applications. C1 is the X rated AC capacitor so as to reduces climax volt AC. D1-D4 rectifies AC to DC and C2 removes ripples. R1 is the bleeder to remove stored current clothed in AC....
-
-
Anti-log or exponential generation is simply a matter of rearranging the logarithmic circuitry. The circuit diagram below shows the circuitry of the log...
-
The circuit was designed to operate a frequency modulation voice transmitter over the FM band 2 frequency range of VHF. Transmitter an electronic device....
-
-
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 circuit allows an SPST momentary pushbutton to act as a push-on push-off switch, using a DPDT latching (bi-stable) relay. It was originally intended to allow a single pushbutton switch on the dash of a vintage car to provide a latched function. The....
-
New cellular phones have incorporated high resolution cameras, which require high brightness illumination of the ambient area in order to achieve high quality pictures. Traditional xenon-filled photo Flash cannot be used in the very tight space available to....
-
The first choice is usually an integrated circuit designed for the purpose. A typical assortment can be seen on this National Semiconductor page. Discrete designs can also be built with readily available transistors or op-amps andmany designs are featured in....
-
i have a fujiya fl-555 (schematic attached) that i am having problems with. the recorder`s volume is very low even at maximum setting. it was working....
-
Figure shows a great project / schematic of a 12V solar LED night activated lamp circuit. This is a versatile project and can be used for variety of purposes. For example you can use it as a great automatic solar garden light and this can be done easily by....
-
This 900 MHz Amplifier Circuit is built with BFG480W which has a good linearity performance. Therefore the BFG480W is well suited for LNAs with high linear....
-
The telephone-line extension bell ringer shown will enable you to add a remote ringer in your garage or some other area where a ringing telephone cannot be heard Up to Four ringers can be used on a single telephone line and a remote bell can be used 100 feet....
-
i have a tandberg 74b that i just received second hand - everything on the inside is original, excluding previously replaced tubes. when it first....
-
LMD18245 bipolar stepper motor driver circuit design using few electronic parts..
-
A simple 12 volt inverter circuit. This 120V AC power source is built with a simple 120V:24V center-tapped control transformer and four additional component. This circuit outputs a clean 200-V pk-pk square wave at 60 Hz and can supply up to 20W. The circuit....
-
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....
-
-
This new design has replaced the old one. The design shown on this page is obsolete. The new design has more features, is flash upgradable, is much easier to use, costs less, and is actually available if you`d like to buy one! It`s better than this old....
-
-
The following discussion helps you choose the best microprocessor supervisor IC suited to your application, and offers solutions for many common microprocessor supervisory problems....
-
This is a very simple transistor tester circuit the circuit can be used to test NPN and PNP transistors. The voltage source is a 6V power supply which is 230V AC to 6V step down transformer. It is essential to put the transistor leads in right direction like....
-
-
A plot showing the paths of the recently-tracked and currently-tracked satellites. The receiver`s location is the "bull`s eye" in the center while the top of the plot represents the North pole. The red line shows the "EFC" value - the setting of the....
-
This is high fidelity, high quality audio amplifier circuit diagram. You dont need pre amplifier. Component list: R1,R4 = 47K 1/4W Resistors R2 = 4K7 1/4W Resistors R3 = 1K5 1/4W Resistors R5 = 390R 1/4W Resistors R6 = 470R 1/4W Resistors R....
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FT232RL USB to Serial UART (TTL) Adapter is a simple and inexpensive way to connect PIC, AVR or ATMEGA MCUs to a PC or Mac via USB connection. FT232RL is an impressive chip because it implements full v2. 0 USB protocol, needs no external crystal, has....
-
The circuit described here is eminently suitable to indicate the capacity of a battery. We use a cheap electric clock for this. By connecting a resistor across the battery terminals, the battery is discharged somewhat faster than with the clock alone. If we....
-
-
-
-
-
Note: This project page has morphed into a design discussion. (Constructive suggestions and collaboration are still welcome. See the comments sectio....
-
-
-
LM331 is basically a precision voltage to frequency converter from National Semiconductors. The IC has a hand full of applications like analog to digital conversion, long term integration, voltage to frequency conversion, frequency to voltage conversion.....
-
Car and Motorcycle Battery Tester Circuit Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charged lead acid battery and a power....
-
-
The current loop interface circuit diagram of AD694 multi-functional sensor signal conditioner being used as D / A converter. The current loop interface of AD694 being used as D / A converter (DAC) can achieve the conversion of digitalvalue †’voltage signal....
-
LM3876 based 50 watt audio amplifier circuit. Operates from +/-35V DC. Simple design, low noise,....
-
This is not new Idea of interfacing LCD using two wires, but it can help in many situations when there is not enough of microcontroller pins. This example is based onHitachi 44780 Alphanumerical LCD. This circuit I provide is only to represent an idea but I....
-
This circuit, which uses a CD4538 retriggerable monostable multivibrator and a CD4011 NAND chip, can sense fluid levels using a variable capacitance ( see the figure ). Such a sensor can be as simple as two adhesive copper foil strips on a saline or....
-
The automatic sprinkler controller circuit is composed of the clock timing controller, monostable flip-flop, bistable flip flop, electronic switch, self-excited multivibrator, counter, solenoid valve control circuit and power supply circuit, and the circuit....
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This circuit using power mosfet IRF840 for 60 Watt linear amplifier. The IRF series of power transistors are available in various voltage and ....
-
-
This is a simple proximity switches with IC 4049th The IC4049 is a bipolar monolithic integrated circuit for use in metal-detection system / proximity sensing applications IC4049 includes an oscillator constituted by an external parallel resonant tank....
-
The schematic for this project is much more complicated than previous projects. There are four main features in our design. (1) We will be able to program the pic on the board we develop. (2) We will be controlling a servo. (3) We will be taking data input....
-
This circuit produces a ringing sound similar to that made by more recent telephones. It consists of three almost identical oscillators connected in a chain, each generating a squarewave signal. The frequency of each oscillator depends on the RC combination:....
-
-
-
This circuit uses a 555 timer which is setup to both runn in an Astable operating mode. This generates a continuous output via Pin 3 in the form of a square wave. When the timer`s output changes to a high state this triggers the a cycle on the 4017 4017....
-
problem is my MOSFET gets realy hot. due to the circuit is using half bridge and no mosfet driver. I cannot get the tc4429 ic where i live. any other ideas how i can stop my MOSFET over heating, or maybe how to conect another mosfet driver. Probably wouldn`t....
-
The first thing I need to know how C1 is related to resonance frequency f of the circuit. It seems like I can choose a frequency and I automatically get a needed value for C1. I have a lot of doubts I don`t know if the circuit constitutes a Colpitts or....
-
In this instructable I use an example of interfacing an Arduino to an ARINC 429 transceiver in order to demonstrate the general process of interfacing an Arduino to electronic circuits so you can use these techniques on your own designs. An ARINC 429 bus is....
-
-
When turning a computer on and off, various peripherals (such as printers, screen, scanner, etc. ) often have to be turned on and off as well. By using the 5-V supply voltage from the USB interface on the PC, all these peripherals can easily be switched on....
-
This volume controller equalizer electronic project is designed using LM1036 DC tone volume controller with volume and balance circuit for stereo applications. The four control inputs of the LM1036 volume controller provides control of the bass, treble,....
-
A Simple LED Voltmeter to Monitor the charge level in Lead Acid Battery or Tubular battery. The terminal voltage of the battery is indicated through a four level LED indicators. The nominal terminal voltage of a Lead Acid battery is 13. 8 volts and that of a....
-
A sidetone oscillator is a special audio oscillator that is turned on and off with the transmitter. The oscillator is rf-driven and bat-tery operated. It uses a 555 IC timer as an astable multivibrator. Keying is accomplished by applying a positive dc....
-
This article describes a circuit of simple single cell li ion battery charger or lithium ion battery charger. Using the LP2391 regulator IC....
-
The following instructions will allow you to build a practical test tool for troubleshooting and analyzing digital and microcontroller circuits. The complete Assembly and Instruction Manual can be downloaded from the the following web link: Don`s Projects....
-
Any idea where can I get the schematics for the dome light dimmer to be used in car. Which means that when I open the door, the light will light up and when closed, the light will slower dim and off. Thank you for the reply, how would I connect the circuit....
-
This be mini size power amplifier 2 watt OTL that use IC LM380. Be base readymade circuit for side sound work and the communication. Which use outside equipment adds least. The C6 can choose get many the value since 47uF to at 470uF which, have a voice good....
-
Boss MT2 Metal Zone Distortion Pedal Schematic. The MT-2 Metal pedal is one the most popular guitar pedals, providing over-the-top, insane distortion tones with huge mids and lows and an ultra-saturated sound....
-
555 timer circuits LM555 - Astable Oscillator Calculator + Capacitor Calculator, Basic Circuits For The LM555 Timer, Triggering And Timing Helpers For Monostable Timers, Controlling Circuits For LM555 Timers, Advanced Circuits For The LM555 Timer, LM556....
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C2 can be chosen for the degree of smoothness as its value is effectively multiplied by the combined gains of Q1/Q2, if 100 µF is chosen for C2, assuming minimum hef for Q1 and Q2,..
-
The following touch switch circuit uses a CA3240 dual BiMOS op amp to sense small currents flowing between the contact points on a touch plate. Since this....
-
Rasbian on the Raspberry Pi is great, but the official image is large and includes all sorts of stuff I don`t need (my Pis don`t generally have screens as I use them for playing music, or being GPS NTP time servers, or collecting data on my power usage not....
-
Using the A3952S stepper motor controller designed by Allegro MicroSystems can be designed a very simple and useful motor driver circuit that can be used in many electronic applications. A3952S stepper motor controller is capable of continuous output....
-
This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape....
-
A partial solution to quietening noisy PCs can be to reduce the speed of internal cooling fans. Low-cost fan speed controllers are available, but they often employ inefficient, heat-generating linear regulators and contain no temperature feedback mechanism.....
-
The circuit requires an RF input which can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz (Medium Wave) up to 30 MHz in the SW band. The input Switch S1, applies voltage to a set of relays which switch in the appropriate....
-
An RF power amplifier is a type of electronic amplifier which is utilised to convert a low-power radio-frequency signal into a larger signal of significant power, usually for driving the antenna of a transmitter. It is usually optimized to have high....
-
This be Simple high pass Filter perform filter especial tall frequency can change only. By use IC 741 , be the integrated circuit op-amp very the circuit....
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This version of the Link is for those who really need a good cheap intercom that will work reliably, but without access to an outside Telco line. This could be in a pre school, a hobby farm or a small workshop or factory, where external phone traffic needs....
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The range of this FM transmitter is around 100 meters at 9V DC supply. The circuit comprises three stages. The first stage is a microphone preamplifier built around BC548 transistor. The next stage is a VHF oscillator wired around another BC548. (BC series....
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The following is my modification of the Headlight wiring for 240Z`s. I made this modification in order to take the current load off of the Headlight switch and put the load onto two relays, giving more current to the lights at the same time. This circuit is....
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In a monostable multivibrator, one of the state is absolutely permanent i. e, stable and the other one is temporary i. e, quasi-stable. When an external trigger pulse is applied to the mono-stable at appropriate point, the mono-stable changes it state from....
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How to measure water purity How to test water quality using a simple electronics project You can perform water purity measurement and water quality analysis using this water purity checker circuit. This circuit is built around a simple LDR (Light Depended....
nokia 5130 keypad jumper just follow the diagram.. tested just now.. after doing the jumper.. all keypads working well ....
Most of the telephone security devices available in market are simple but quite expensive. These devices provide blinking or beeping type line-tap/misuse indications. Quite often they do not offer guaranteed protection against unauthorized operation. A very....
This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around a standard reflective opto-sensor CNY70(IC1). In some disciplines, a line following robot or an....
Another way other than magnetic reed switches for the alarm trip switch. The circuit needs the switch to be normally closed / held open (when the door is shut. ). I was looking to use a normally closed momentary push button. Another thought was trying to....
One example of the phase shift oscillator is Bubba oscillator. This oscillator gets 45 degree phase shift for each section from quad op-amp package. The....
This is an area that is dominated by commercial information resellers. One outstanding exception is Nostalgia Air, which has a growing data base of radio schematics. Some of the links here point to Nostalgia Air `s database, but if you can`t find it here,....
The circuit diagram shown here is a simple circuit DC power delay, which is based on an SCR (Silicon-Controlled Rectifier). This circuit is very useful and can be used in many applications. The operation of this circuit is very simple. When input power is....
This is scircuit which I built to one of audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is wait around....
This example shows how to make use of the Watchdog and Sleep functions provided by the ATMEGA 168 chip. These functions are useful if you want to build low power consuming devices operated by battery or solar power. The reduced power consumption is achieved....
This single transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most o....
This is a high-speed control scheme LED display screen circuit theory. Adopt the MCS51 series one-chip computer to control LED display screen; The random access memory 62512 is used as the data storage of LED display screen, store the matrix data waiting to....
This is necessary to set the 10K potentiometer while pointing the device at your TV to block the IR rays from the remote. This can be done by trial and error..
Difficult to observe in order to solve the leaning phase in adjusting the electric transmission line manually, record and difficult and normalizing three major difficult problems this difficultly. This design passes the design of the software and hardware,....
BEAMSonics is a clever little circuit designed by Wilf Rigter. It`s central function is to filter incoming sounds and count high pitched pulses, whistles, beeps etc. When it hears a certain number of beeps it will respond with a noise of its own. If left on....
The Spartan-3 board has eight LED Connected with FPGA I/O pins (details tabulated below). The cathode of each LED connects to ground via a 330 © resistor. To light an individual LED, drive the associated FPGA control signal to High...
Logic indicator circuit / logic probe is used to identify logic level at any point of logic circuitry. The indicator can be visual (using LED, LCD, of 7...
This is a 12V 100mA Transformerless power supply in support of low current applications. C1 is the X rated AC capacitor so as to reduces climax volt AC. D1-D4 rectifies AC to DC and C2 removes ripples. R1 is the bleeder to remove stored current clothed in AC....
Anti-log or exponential generation is simply a matter of rearranging the logarithmic circuitry. The circuit diagram below shows the circuitry of the log...
The circuit was designed to operate a frequency modulation voice transmitter over the FM band 2 frequency range of VHF. Transmitter an electronic device....
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 circuit allows an SPST momentary pushbutton to act as a push-on push-off switch, using a DPDT latching (bi-stable) relay. It was originally intended to allow a single pushbutton switch on the dash of a vintage car to provide a latched function. The....
New cellular phones have incorporated high resolution cameras, which require high brightness illumination of the ambient area in order to achieve high quality pictures. Traditional xenon-filled photo Flash cannot be used in the very tight space available to....
The first choice is usually an integrated circuit designed for the purpose. A typical assortment can be seen on this National Semiconductor page. Discrete designs can also be built with readily available transistors or op-amps andmany designs are featured in....
i have a fujiya fl-555 (schematic attached) that i am having problems with. the recorder`s volume is very low even at maximum setting. it was working....
Figure shows a great project / schematic of a 12V solar LED night activated lamp circuit. This is a versatile project and can be used for variety of purposes. For example you can use it as a great automatic solar garden light and this can be done easily by....
This 900 MHz Amplifier Circuit is built with BFG480W which has a good linearity performance. Therefore the BFG480W is well suited for LNAs with high linear....
The telephone-line extension bell ringer shown will enable you to add a remote ringer in your garage or some other area where a ringing telephone cannot be heard Up to Four ringers can be used on a single telephone line and a remote bell can be used 100 feet....
i have a tandberg 74b that i just received second hand - everything on the inside is original, excluding previously replaced tubes. when it first....
LMD18245 bipolar stepper motor driver circuit design using few electronic parts..
A simple 12 volt inverter circuit. This 120V AC power source is built with a simple 120V:24V center-tapped control transformer and four additional component. This circuit outputs a clean 200-V pk-pk square wave at 60 Hz and can supply up to 20W. The circuit....
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....
This new design has replaced the old one. The design shown on this page is obsolete. The new design has more features, is flash upgradable, is much easier to use, costs less, and is actually available if you`d like to buy one! It`s better than this old....
The following discussion helps you choose the best microprocessor supervisor IC suited to your application, and offers solutions for many common microprocessor supervisory problems....
This is a very simple transistor tester circuit the circuit can be used to test NPN and PNP transistors. The voltage source is a 6V power supply which is 230V AC to 6V step down transformer. It is essential to put the transistor leads in right direction like....
A plot showing the paths of the recently-tracked and currently-tracked satellites. The receiver`s location is the "bull`s eye" in the center while the top of the plot represents the North pole. The red line shows the "EFC" value - the setting of the....
This is high fidelity, high quality audio amplifier circuit diagram. You dont need pre amplifier. Component list: R1,R4 = 47K 1/4W Resistors R2 = 4K7 1/4W Resistors R3 = 1K5 1/4W Resistors R5 = 390R 1/4W Resistors R6 = 470R 1/4W Resistors R....
FT232RL USB to Serial UART (TTL) Adapter is a simple and inexpensive way to connect PIC, AVR or ATMEGA MCUs to a PC or Mac via USB connection. FT232RL is an impressive chip because it implements full v2. 0 USB protocol, needs no external crystal, has....
The circuit described here is eminently suitable to indicate the capacity of a battery. We use a cheap electric clock for this. By connecting a resistor across the battery terminals, the battery is discharged somewhat faster than with the clock alone. If we....
Note: This project page has morphed into a design discussion. (Constructive suggestions and collaboration are still welcome. See the comments sectio....
LM331 is basically a precision voltage to frequency converter from National Semiconductors. The IC has a hand full of applications like analog to digital conversion, long term integration, voltage to frequency conversion, frequency to voltage conversion.....
Car and Motorcycle Battery Tester Circuit Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charged lead acid battery and a power....
The current loop interface circuit diagram of AD694 multi-functional sensor signal conditioner being used as D / A converter. The current loop interface of AD694 being used as D / A converter (DAC) can achieve the conversion of digitalvalue †’voltage signal....
LM3876 based 50 watt audio amplifier circuit. Operates from +/-35V DC. Simple design, low noise,....
This is not new Idea of interfacing LCD using two wires, but it can help in many situations when there is not enough of microcontroller pins. This example is based onHitachi 44780 Alphanumerical LCD. This circuit I provide is only to represent an idea but I....
This circuit, which uses a CD4538 retriggerable monostable multivibrator and a CD4011 NAND chip, can sense fluid levels using a variable capacitance ( see the figure ). Such a sensor can be as simple as two adhesive copper foil strips on a saline or....
The automatic sprinkler controller circuit is composed of the clock timing controller, monostable flip-flop, bistable flip flop, electronic switch, self-excited multivibrator, counter, solenoid valve control circuit and power supply circuit, and the circuit....
This circuit using power mosfet IRF840 for 60 Watt linear amplifier. The IRF series of power transistors are available in various voltage and ....
This is a simple proximity switches with IC 4049th The IC4049 is a bipolar monolithic integrated circuit for use in metal-detection system / proximity sensing applications IC4049 includes an oscillator constituted by an external parallel resonant tank....
The schematic for this project is much more complicated than previous projects. There are four main features in our design. (1) We will be able to program the pic on the board we develop. (2) We will be controlling a servo. (3) We will be taking data input....
This circuit produces a ringing sound similar to that made by more recent telephones. It consists of three almost identical oscillators connected in a chain, each generating a squarewave signal. The frequency of each oscillator depends on the RC combination:....
This circuit uses a 555 timer which is setup to both runn in an Astable operating mode. This generates a continuous output via Pin 3 in the form of a square wave. When the timer`s output changes to a high state this triggers the a cycle on the 4017 4017....
problem is my MOSFET gets realy hot. due to the circuit is using half bridge and no mosfet driver. I cannot get the tc4429 ic where i live. any other ideas how i can stop my MOSFET over heating, or maybe how to conect another mosfet driver. Probably wouldn`t....
The first thing I need to know how C1 is related to resonance frequency f of the circuit. It seems like I can choose a frequency and I automatically get a needed value for C1. I have a lot of doubts I don`t know if the circuit constitutes a Colpitts or....
In this instructable I use an example of interfacing an Arduino to an ARINC 429 transceiver in order to demonstrate the general process of interfacing an Arduino to electronic circuits so you can use these techniques on your own designs. An ARINC 429 bus is....
When turning a computer on and off, various peripherals (such as printers, screen, scanner, etc. ) often have to be turned on and off as well. By using the 5-V supply voltage from the USB interface on the PC, all these peripherals can easily be switched on....
This volume controller equalizer electronic project is designed using LM1036 DC tone volume controller with volume and balance circuit for stereo applications. The four control inputs of the LM1036 volume controller provides control of the bass, treble,....
A Simple LED Voltmeter to Monitor the charge level in Lead Acid Battery or Tubular battery. The terminal voltage of the battery is indicated through a four level LED indicators. The nominal terminal voltage of a Lead Acid battery is 13. 8 volts and that of a....
A sidetone oscillator is a special audio oscillator that is turned on and off with the transmitter. The oscillator is rf-driven and bat-tery operated. It uses a 555 IC timer as an astable multivibrator. Keying is accomplished by applying a positive dc....
This article describes a circuit of simple single cell li ion battery charger or lithium ion battery charger. Using the LP2391 regulator IC....
The following instructions will allow you to build a practical test tool for troubleshooting and analyzing digital and microcontroller circuits. The complete Assembly and Instruction Manual can be downloaded from the the following web link: Don`s Projects....
Any idea where can I get the schematics for the dome light dimmer to be used in car. Which means that when I open the door, the light will light up and when closed, the light will slower dim and off. Thank you for the reply, how would I connect the circuit....
This be mini size power amplifier 2 watt OTL that use IC LM380. Be base readymade circuit for side sound work and the communication. Which use outside equipment adds least. The C6 can choose get many the value since 47uF to at 470uF which, have a voice good....
Boss MT2 Metal Zone Distortion Pedal Schematic. The MT-2 Metal pedal is one the most popular guitar pedals, providing over-the-top, insane distortion tones with huge mids and lows and an ultra-saturated sound....
555 timer circuits LM555 - Astable Oscillator Calculator + Capacitor Calculator, Basic Circuits For The LM555 Timer, Triggering And Timing Helpers For Monostable Timers, Controlling Circuits For LM555 Timers, Advanced Circuits For The LM555 Timer, LM556....
C2 can be chosen for the degree of smoothness as its value is effectively multiplied by the combined gains of Q1/Q2, if 100 µF is chosen for C2, assuming minimum hef for Q1 and Q2,..
The following touch switch circuit uses a CA3240 dual BiMOS op amp to sense small currents flowing between the contact points on a touch plate. Since this....
Rasbian on the Raspberry Pi is great, but the official image is large and includes all sorts of stuff I don`t need (my Pis don`t generally have screens as I use them for playing music, or being GPS NTP time servers, or collecting data on my power usage not....
Using the A3952S stepper motor controller designed by Allegro MicroSystems can be designed a very simple and useful motor driver circuit that can be used in many electronic applications. A3952S stepper motor controller is capable of continuous output....
This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape....
A partial solution to quietening noisy PCs can be to reduce the speed of internal cooling fans. Low-cost fan speed controllers are available, but they often employ inefficient, heat-generating linear regulators and contain no temperature feedback mechanism.....
The circuit requires an RF input which can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz (Medium Wave) up to 30 MHz in the SW band. The input Switch S1, applies voltage to a set of relays which switch in the appropriate....
An RF power amplifier is a type of electronic amplifier which is utilised to convert a low-power radio-frequency signal into a larger signal of significant power, usually for driving the antenna of a transmitter. It is usually optimized to have high....
This be Simple high pass Filter perform filter especial tall frequency can change only. By use IC 741 , be the integrated circuit op-amp very the circuit....
This version of the Link is for those who really need a good cheap intercom that will work reliably, but without access to an outside Telco line. This could be in a pre school, a hobby farm or a small workshop or factory, where external phone traffic needs....
The range of this FM transmitter is around 100 meters at 9V DC supply. The circuit comprises three stages. The first stage is a microphone preamplifier built around BC548 transistor. The next stage is a VHF oscillator wired around another BC548. (BC series....
The following is my modification of the Headlight wiring for 240Z`s. I made this modification in order to take the current load off of the Headlight switch and put the load onto two relays, giving more current to the lights at the same time. This circuit is....
In a monostable multivibrator, one of the state is absolutely permanent i. e, stable and the other one is temporary i. e, quasi-stable. When an external trigger pulse is applied to the mono-stable at appropriate point, the mono-stable changes it state from....
How to measure water purity How to test water quality using a simple electronics project You can perform water purity measurement and water quality analysis using this water purity checker circuit. This circuit is built around a simple LDR (Light Depended....
