New Circuits Page 47
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Values shown are for 13-kHz bandwidth 1070 Hz for mark and 1270 Hz for space, using Exar XR-2206 function generator and XR-2211 FSK de-modulator Report gives design procedure Supply can be ‹12 v "Phase-Locked Loop Data Book, "Exar Integrated Systems,....
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-
When the push switch is operated - the buzzer will sound and the LEDs will begin to flash. For the hearing members of the household - the buzzer acts as a regular doorbell. It also re-assures the visitor that the doorbell is working. When the push switch is....
-
One of the drawbacks for some of us is that Linux support for PICs is not very well known. The information is out there, but no one has laid out the process of going from writing C code to programming a chip. Written for Linux users that are familiar with....
-
-
-
The control-circuit output current has to be amplified when the gate current required to trigger the device is higher than the control-circuit output current...
-
-
The new TPS2359 hot-plug controller integrates all of the power management functions for two AdvancedMC (AMC) modules. Its current limiting circuitry enables designers to meet tight AMC requirements. This is relevant because many applications use redundant....
-
This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the....
-
NCP2830 audio power amplifier main features are : high quality audio (THD+N = 0. 04%), low noise: SNR up to 100 dB, overall system efficiency optimization: up to 89%, Superior PSRR ( ’88 dB): Direct Connection to Battery, Very Low Quiescent Current 7 mA,....
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The signal from MSP430 PWM pin isn`t quite ready to drive a speaker or amplifier. First, we can clean up the signal a bit by running it through a low pass filter. This clips the sharp edges from the PWM waveform to make it sound a bit more natural. You can....
-
Derating is the method of decreasing a devices operational limits as temperature is increased, in this case derating a devices operational power dissipation vs increasing ambient temperature. Ambient temperature. is the air temperature measured below a....
-
-
This circuit provides sine and square wave at frequency of below 20Hz up to above 20KHz. The benefit of this circuit diagram is that you can adjust the output frequency by varry the variable resistor of R6. ..
-
-
This article describes how to implement a simple, but robust, optical wheel encoder system on a robot that uses hobby servos for two-wheel differential drive. In my case I am using the TJ-PROTM robot platform from MekatronixTM, and some aspects of this....
-
This DIY magnetic field sensor circuit is very simple and can detect fixed magnetic fields or fields that are varying at an audio frequency. The unit is no....
-
The crock pot is attached to a relay that can switch it on or off. The relay is toggled by a microcontroller based on readings from a temperature sensor ( thermistor ) placed inside the crock pot. Heat the milk to 185 °F (85 °C). This kills off microbes to....
-
Powering up my twin digital Sony DSC-V1 cameras at exactly the same time frequently synchronizes the cameras to a remarkable degree, within milliseconds. The cameras are powered up by twinned Sony wired remotes by shorting the ACC port LANC signal conductor....
-
-
-
-
What do you do with those old 2-Meter FM rigs that don`t have any CTCSS tone capability Well, you add it of course! While big knob` tone encoders have been available from several sources, their downside has been having to know the tone of the repeater you....
-
-
The circuit illustrates the use of 3 frequencies to produce a graphic equalizer that will be used for acoustic signals. Equalizer a passive or an active....
-
This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op-amp MC1458 and LM 380. The two op amps inside the MC 1458 are used to produce square and triangular waves. LM 380 is....
-
18W Audio Amplifier made of transistors..
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This is a circuit diagram of amplifier circuit, these circuits have a 10W audio power amplifier using TDA2003 IC from SGS Thomson popular. The IC can easily provide 10W into 4 Ohms load at 18V DC supply voltage. IC can also be operated from 12V and that....
-
This is the cheapest 150 Watt amplifier circuit you can get, I think. Based on two Darlington power transistors TIP 142 and TIP 147, this circuit can deliver a blasting 150 W Rms to a 4 Ohm speaker. Enough for you to get rocked, then try out this. TIP 147....
-
The working and circuit diagram of a two mode night light circuit is given below....
-
The AD7740 is the world`s smallest, lowest-cost, 12-Bit accurate VFC. Since this is a synchronous converter, the output frequency is related to the fixed master Clock frequency so temperature stability is much improved over asynchronous VFCs. With a 1 MHz....
-
The following circuit shows about 555 Timer IC For RF Sweeper. Features: used a 1N4004 Diode, JF1OZL uses a pot for a fine frequency control ....
-
-
An interesting hobby circuit of a crank door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact battery is enough for powering the whole gadget. Timer IC (NE555)....
-
This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can also check the output power transistors on amplifier circuits. Circuit....
-
My 2007 Mustang convert. top won`t go down. Started down, got to about 6" open then stopped. It will engage to go back up, but won`t go down. Have checked all fuses, OK. When I press the down switch I can hear the top motor running. It indicates a mechanical....
-
This is a circuit that can generate 1kHz to 25kHz sine waves with a THD better than -80dB. This circuit consist of a 4th-order low-pass filter, a TTL counter....
-
Another version of the 1W VHF amplifier for the FM transceiver, well, in fact, it`s still the same version since I didn`t managed to get 1W. YET! Today I made some tests with a 2n2553 and a 2n2866. it melted solder in one of the base resistors (never I had....
-
I made circuit diagram in Kicad (In my opinion the best freeware software for drawing electronic diagrams and printed circuits boards). For printing....
-
The Hartley Oscillator is an L C oscillator that derives its feedback from magnetically coupled energy in a tapped coil. Hartley oscillator are inductively coupled variable frequency oscillators...
-
The Network Time Protocol (NTP) has revolutionized the world. Suddenly one could have anywhere in the world accurate time and date. NTP is a simple UDP based protocol and can be implemented in a microcontroller. The tuxgraphics NTP clock has been very....
-
-
-
-
-
A flame sensor (UV TRON) made by HAMAMATSU PHOTONICS, Japan, is an ultraviolet light detector. It has a narrow spectral sensitivity of 185 nm to 260 nm, being completely insensitive to visible and infrared light. Unlike semiconductor detectors, it does not....
-
-
-
-
A simple white LED driver circuit can be designed using the LM3530 high efficiency white LED driver IC with programmable ambient light sensing capability and I2C compatible interface. LM3530 LED driver can control up to 11 series white LED`s and can be used....
-
BU8732AKV is a PCM codec IC for digital cellular phones. This includes plenty of Analog input / output functions such as a 14bit precision linear. / A-LAW codec, a Microphone Amplifier with two systems, Amplifiers for speaker and earphone and a Switch....
-
A simple 5 Volt regulated PSU featuring overvoltage protection. The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be v....
-
So to reduce the resonant frequency and get some useful signals, I took some washers slapped them on a bolt and some nuts and experimented. I used aOscilloscopewith FFT and changed the weight on the tip of the film until frequencies of around 40Hz were the....
-
The H-Bridge is a circuit which can drive a motor in forward and reverse. It can be a very simple circuit that requires only a handful of components....
-
The circuit would automatically light a bulb on arrival of a telephone ring and simultaneously mute the music system/TV audio for the duration the telephone handset is off-hook. Lighting of the bulb would not only indicate an incoming call but also help in....
-
This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it`s a modern substitute for the old sandglass. Useful also for....
-
In a traditional microstepping motor controller, many parallel outputs of a microcontroller are used which are then converted to analog signals using a DAC and fed through a power amplifier to the motor coils. This approach is inefficient both in terms of....
-
The potensiometer adjust the trigger on` level. The diode in the circuit diagram shows to be 1N914. This is ok if you have a light-duty relay, also the 1N914 is a signal diode so actually does not qualify. Use a 1N4001 (or better) instead. A couple of....
-
The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. It is more serious in the case of domestic appliances like fridge and air conditioners. If a fridge is operated on low voltage, excessive current flows....
-
Microcontroller design where the mcu is placed in hibernation mode, and can only be awoken by a pulse(high-low-high) signal on the reset pin. (active low) As a wake-up source i`m using an accelerometer or an external RTC. The idea is to have the....
-
This is a very simple circuit of UHF band TV antenna booster with 15dB gain power. This low cost antenna booster is simple and easy to build. This ....
-
At the point Vp the Emitter triggers and TURN the ujt ON, until this point ; the emitter is isolated(doesnt conduct) from the transistor so no Current Conduction occurs between Base1 and Base2...
-
-
In electron technology, the triode uses a kind of extremely general components and parts, the parameter of the triode and a lot of electricity parametric measurement schemes, measuring results have a very close relation, so, in the electronic design, the....
-
This is a circuit for laser door alarm is based on the interruption of Laser beam. A low cost Laser pointer is used as the source of light beam. When somebody breaks the laser path, the alarm will be generated for few seconds. This is the figure of the....
-
-
-
This is a Servo System Controller circuit. This circuit is used to control a servo motor remotely. This circuit uses the 555 and requires only six extra...
-
-
I did some quick playing with the circuit. It is very close to sustaining oscillation. Changing R2 to 10. 5k will cause it to sustain oscillation. The original authors of the note that you reference are no longer with TI so we cannot consult with them.....
-
The current draw should be somewhere between 80 and 100 mA. The exact value is very much dependent upon the Si570, the version (CMOS vs LVDS), the frequency setting, and component variations in the circuit. You can test the SW1 programming of U3 by checking....
-
This is the very simple circuit diagram of 150W power amplifier. The circuit is easy enough to built without PCB. The power output range is about 100-150W depends to the power supply and the Darlington`s you use for the amplifier. Heatsink is a must since....
-
-
Q1 and Q2 form an ALL-ON ALL-OFF circuit that in the off state draws no significant current. P1 starts the circuit, the relay is turned on and the two ICs are powered. The lamp is powered by the relay switch, and IC2 is reset with a positive voltage at pin....
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This circuit is design circuit for low drop out charger using a MOSFET as the pass element, but this circuit does not include current limiting. This is the figure of the circuit. This circuit is a simple design. This circuit uses Q3 and a Schottky diode to....
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This section will list several projects which will allow you to build your own RF design test equipment. Microwave construction techniques and basic electronic skills will be required on some projects, but the tools you can make will equal what the so-called....
-
In interfacing AC loads, isolation is very important. This because an interfaced circuit that do not isolates the computer from the AC load have chances that the computer will be so much affected if ever the interfaced circuit will fail or be destroyed.....
-
The FM Remote Control Receiver` (available on this website in Infra-red circuits section) has a connector where an analogue output is made available. To make a simple intercom or P. A. system the associated transmitter needs a microphone pre-amplifier that....
-
The circuit for the Digital Tachometer/RPM Counter consists of only a few devices. Wire them up according to the following circuit diagram. The PIC I`m using is on a demonstration board, which means the clock, power and ground pins are already wired up so I....
-
The basic techniques of designing electro-mechanical systems and to gain the knowledge on tuning and controlling dynamic systems. The design of this course should attract special interests of many universities becauseit actually requires students to build....
-
-
There are three Controls to be Adjusted to make a Proportional Flow Controller Perform Properly. This method has to be practiced and experience gained from it can be used to get very good and stable Control of the Flow or Velocity of a Fluid. This is the....
-
The easy way to power your projects Here is the circuit diagram of regulated power supply. It is a small power supply that provides a regulated voltage, a....
-
Present roads in good condition than the former Pan. The traffic is convenient. But often ran high speeds. When we use the bicycle at night. Although the...
-
This page presents an alternate option to directly control your mount`s stepper motor board. There is not much difference in terms of stepper control functionality from the original modification as they both allow commands to be sent from the PC directly to....
-
-
This circuit is based on a standard LT1074CT switching regulator IC. For sure, Application Note AN35 published by Linear Technology describes the design far more elegantly than the author could in this short article. Interested readers are therefore strongly....
-
-
Hello All Experts, i m in need of Transistor Ignition to replace point breaker from my motorcycle. i read many many articles in internet google and almost all forums but did not yet found working and simples smallest circuit yet. and which i found they dont....
-
The principle used in this electronic head or tail circuit is simple: a multivibrator controls a flip flop. The multivibrator oscillates as long as the buton S1 is pressed and the flip flop switches on and off with a frequency of several kilohertz. When the....
-
-
The circuit I used is a very common one. You can do a google search for 555 timer LED blinker and find hundreds of schematis that will fit the bill. Here is the schematic for my particular flavor of LED blinker: The variable resistor (100K) in the....
-
A homebrew 2M transceiver I wanted to use it mobile so I wouldn`t have been able to use a fist mike. I had the bright idea of using one of those cheap personal hands free kits you can buy for mobile phones, however once installed reality struck home - hardly....
-
This temperature controller employs an LM135/235/335 temperature sensor, can be used to keep small environment warm or hot. Here is the schematic diagram:....
-
-
This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone. The dial tone we heard when we pick up the phone set is call Dual Tone Multi-Frequency, DTMF in short. The name was given because the tone that....
-
-
The WWVB signal is broadcast as a 60 kHz carrier that is AM modulated with a time code frame that is updated once per minute. The data rate is one bit per second. Along with time code information, the data frame also contains synchronization bits, calendar....
-
Are you looking for a free schematic and pcb design tool? The gEDA project has produced and continues working on a full GPL`d suite and toolkit of Electronic Design ....
-
This is a simple touch switch circuit, the 555 timer is configured as a one shot multivibrator that is triggered by touching the touch terminal. In this monostable mode, the timer generates a fixed pulse of about 4 seconds whenever the trigger voltage falls....
-
The circuit is composed of lag comparator with A1 and inverting integrator A2, and the charging and discharging time constant is decided by integral resistors (R1+RP1) and the capacitor C1. VD1~VD5 form the limiter circuit. The maximum oscillation frequency....
-
This tiny circuit comprising of a single 3 terminal IC UM66 can be built small enough to be placed inside a greeting card and operated off a single 3V flat button cell. There is not much to the circuit. The UM66 is connected to its supply and its output fed....
Values shown are for 13-kHz bandwidth 1070 Hz for mark and 1270 Hz for space, using Exar XR-2206 function generator and XR-2211 FSK de-modulator Report gives design procedure Supply can be ‹12 v "Phase-Locked Loop Data Book, "Exar Integrated Systems,....
When the push switch is operated - the buzzer will sound and the LEDs will begin to flash. For the hearing members of the household - the buzzer acts as a regular doorbell. It also re-assures the visitor that the doorbell is working. When the push switch is....
One of the drawbacks for some of us is that Linux support for PICs is not very well known. The information is out there, but no one has laid out the process of going from writing C code to programming a chip. Written for Linux users that are familiar with....
The control-circuit output current has to be amplified when the gate current required to trigger the device is higher than the control-circuit output current...
The new TPS2359 hot-plug controller integrates all of the power management functions for two AdvancedMC (AMC) modules. Its current limiting circuitry enables designers to meet tight AMC requirements. This is relevant because many applications use redundant....
This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the....
NCP2830 audio power amplifier main features are : high quality audio (THD+N = 0. 04%), low noise: SNR up to 100 dB, overall system efficiency optimization: up to 89%, Superior PSRR ( ’88 dB): Direct Connection to Battery, Very Low Quiescent Current 7 mA,....
The signal from MSP430 PWM pin isn`t quite ready to drive a speaker or amplifier. First, we can clean up the signal a bit by running it through a low pass filter. This clips the sharp edges from the PWM waveform to make it sound a bit more natural. You can....
Derating is the method of decreasing a devices operational limits as temperature is increased, in this case derating a devices operational power dissipation vs increasing ambient temperature. Ambient temperature. is the air temperature measured below a....
This circuit provides sine and square wave at frequency of below 20Hz up to above 20KHz. The benefit of this circuit diagram is that you can adjust the output frequency by varry the variable resistor of R6. ..
This article describes how to implement a simple, but robust, optical wheel encoder system on a robot that uses hobby servos for two-wheel differential drive. In my case I am using the TJ-PROTM robot platform from MekatronixTM, and some aspects of this....
This DIY magnetic field sensor circuit is very simple and can detect fixed magnetic fields or fields that are varying at an audio frequency. The unit is no....
The crock pot is attached to a relay that can switch it on or off. The relay is toggled by a microcontroller based on readings from a temperature sensor ( thermistor ) placed inside the crock pot. Heat the milk to 185 °F (85 °C). This kills off microbes to....
Powering up my twin digital Sony DSC-V1 cameras at exactly the same time frequently synchronizes the cameras to a remarkable degree, within milliseconds. The cameras are powered up by twinned Sony wired remotes by shorting the ACC port LANC signal conductor....
What do you do with those old 2-Meter FM rigs that don`t have any CTCSS tone capability Well, you add it of course! While big knob` tone encoders have been available from several sources, their downside has been having to know the tone of the repeater you....
The circuit illustrates the use of 3 frequencies to produce a graphic equalizer that will be used for acoustic signals. Equalizer a passive or an active....
This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op-amp MC1458 and LM 380. The two op amps inside the MC 1458 are used to produce square and triangular waves. LM 380 is....
This is a circuit diagram of amplifier circuit, these circuits have a 10W audio power amplifier using TDA2003 IC from SGS Thomson popular. The IC can easily provide 10W into 4 Ohms load at 18V DC supply voltage. IC can also be operated from 12V and that....
This is the cheapest 150 Watt amplifier circuit you can get, I think. Based on two Darlington power transistors TIP 142 and TIP 147, this circuit can deliver a blasting 150 W Rms to a 4 Ohm speaker. Enough for you to get rocked, then try out this. TIP 147....
The working and circuit diagram of a two mode night light circuit is given below....
The AD7740 is the world`s smallest, lowest-cost, 12-Bit accurate VFC. Since this is a synchronous converter, the output frequency is related to the fixed master Clock frequency so temperature stability is much improved over asynchronous VFCs. With a 1 MHz....
The following circuit shows about 555 Timer IC For RF Sweeper. Features: used a 1N4004 Diode, JF1OZL uses a pot for a fine frequency control ....
An interesting hobby circuit of a crank door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact battery is enough for powering the whole gadget. Timer IC (NE555)....
This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can also check the output power transistors on amplifier circuits. Circuit....
My 2007 Mustang convert. top won`t go down. Started down, got to about 6" open then stopped. It will engage to go back up, but won`t go down. Have checked all fuses, OK. When I press the down switch I can hear the top motor running. It indicates a mechanical....
This is a circuit that can generate 1kHz to 25kHz sine waves with a THD better than -80dB. This circuit consist of a 4th-order low-pass filter, a TTL counter....
Another version of the 1W VHF amplifier for the FM transceiver, well, in fact, it`s still the same version since I didn`t managed to get 1W. YET! Today I made some tests with a 2n2553 and a 2n2866. it melted solder in one of the base resistors (never I had....
I made circuit diagram in Kicad (In my opinion the best freeware software for drawing electronic diagrams and printed circuits boards). For printing....
The Hartley Oscillator is an L C oscillator that derives its feedback from magnetically coupled energy in a tapped coil. Hartley oscillator are inductively coupled variable frequency oscillators...
The Network Time Protocol (NTP) has revolutionized the world. Suddenly one could have anywhere in the world accurate time and date. NTP is a simple UDP based protocol and can be implemented in a microcontroller. The tuxgraphics NTP clock has been very....
A flame sensor (UV TRON) made by HAMAMATSU PHOTONICS, Japan, is an ultraviolet light detector. It has a narrow spectral sensitivity of 185 nm to 260 nm, being completely insensitive to visible and infrared light. Unlike semiconductor detectors, it does not....
A simple white LED driver circuit can be designed using the LM3530 high efficiency white LED driver IC with programmable ambient light sensing capability and I2C compatible interface. LM3530 LED driver can control up to 11 series white LED`s and can be used....
BU8732AKV is a PCM codec IC for digital cellular phones. This includes plenty of Analog input / output functions such as a 14bit precision linear. / A-LAW codec, a Microphone Amplifier with two systems, Amplifiers for speaker and earphone and a Switch....
A simple 5 Volt regulated PSU featuring overvoltage protection. The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be v....
So to reduce the resonant frequency and get some useful signals, I took some washers slapped them on a bolt and some nuts and experimented. I used aOscilloscopewith FFT and changed the weight on the tip of the film until frequencies of around 40Hz were the....
The H-Bridge is a circuit which can drive a motor in forward and reverse. It can be a very simple circuit that requires only a handful of components....
The circuit would automatically light a bulb on arrival of a telephone ring and simultaneously mute the music system/TV audio for the duration the telephone handset is off-hook. Lighting of the bulb would not only indicate an incoming call but also help in....
This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it`s a modern substitute for the old sandglass. Useful also for....
In a traditional microstepping motor controller, many parallel outputs of a microcontroller are used which are then converted to analog signals using a DAC and fed through a power amplifier to the motor coils. This approach is inefficient both in terms of....
The potensiometer adjust the trigger on` level. The diode in the circuit diagram shows to be 1N914. This is ok if you have a light-duty relay, also the 1N914 is a signal diode so actually does not qualify. Use a 1N4001 (or better) instead. A couple of....
The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. It is more serious in the case of domestic appliances like fridge and air conditioners. If a fridge is operated on low voltage, excessive current flows....
Microcontroller design where the mcu is placed in hibernation mode, and can only be awoken by a pulse(high-low-high) signal on the reset pin. (active low) As a wake-up source i`m using an accelerometer or an external RTC. The idea is to have the....
This is a very simple circuit of UHF band TV antenna booster with 15dB gain power. This low cost antenna booster is simple and easy to build. This ....
At the point Vp the Emitter triggers and TURN the ujt ON, until this point ; the emitter is isolated(doesnt conduct) from the transistor so no Current Conduction occurs between Base1 and Base2...
In electron technology, the triode uses a kind of extremely general components and parts, the parameter of the triode and a lot of electricity parametric measurement schemes, measuring results have a very close relation, so, in the electronic design, the....
This is a circuit for laser door alarm is based on the interruption of Laser beam. A low cost Laser pointer is used as the source of light beam. When somebody breaks the laser path, the alarm will be generated for few seconds. This is the figure of the....
This is a Servo System Controller circuit. This circuit is used to control a servo motor remotely. This circuit uses the 555 and requires only six extra...
I did some quick playing with the circuit. It is very close to sustaining oscillation. Changing R2 to 10. 5k will cause it to sustain oscillation. The original authors of the note that you reference are no longer with TI so we cannot consult with them.....
The current draw should be somewhere between 80 and 100 mA. The exact value is very much dependent upon the Si570, the version (CMOS vs LVDS), the frequency setting, and component variations in the circuit. You can test the SW1 programming of U3 by checking....
This is the very simple circuit diagram of 150W power amplifier. The circuit is easy enough to built without PCB. The power output range is about 100-150W depends to the power supply and the Darlington`s you use for the amplifier. Heatsink is a must since....
Q1 and Q2 form an ALL-ON ALL-OFF circuit that in the off state draws no significant current. P1 starts the circuit, the relay is turned on and the two ICs are powered. The lamp is powered by the relay switch, and IC2 is reset with a positive voltage at pin....
This section will list several projects which will allow you to build your own RF design test equipment. Microwave construction techniques and basic electronic skills will be required on some projects, but the tools you can make will equal what the so-called....
In interfacing AC loads, isolation is very important. This because an interfaced circuit that do not isolates the computer from the AC load have chances that the computer will be so much affected if ever the interfaced circuit will fail or be destroyed.....
The FM Remote Control Receiver` (available on this website in Infra-red circuits section) has a connector where an analogue output is made available. To make a simple intercom or P. A. system the associated transmitter needs a microphone pre-amplifier that....
The circuit for the Digital Tachometer/RPM Counter consists of only a few devices. Wire them up according to the following circuit diagram. The PIC I`m using is on a demonstration board, which means the clock, power and ground pins are already wired up so I....
The basic techniques of designing electro-mechanical systems and to gain the knowledge on tuning and controlling dynamic systems. The design of this course should attract special interests of many universities becauseit actually requires students to build....
There are three Controls to be Adjusted to make a Proportional Flow Controller Perform Properly. This method has to be practiced and experience gained from it can be used to get very good and stable Control of the Flow or Velocity of a Fluid. This is the....
The easy way to power your projects Here is the circuit diagram of regulated power supply. It is a small power supply that provides a regulated voltage, a....
Present roads in good condition than the former Pan. The traffic is convenient. But often ran high speeds. When we use the bicycle at night. Although the...
This page presents an alternate option to directly control your mount`s stepper motor board. There is not much difference in terms of stepper control functionality from the original modification as they both allow commands to be sent from the PC directly to....
This circuit is based on a standard LT1074CT switching regulator IC. For sure, Application Note AN35 published by Linear Technology describes the design far more elegantly than the author could in this short article. Interested readers are therefore strongly....
Hello All Experts, i m in need of Transistor Ignition to replace point breaker from my motorcycle. i read many many articles in internet google and almost all forums but did not yet found working and simples smallest circuit yet. and which i found they dont....
The principle used in this electronic head or tail circuit is simple: a multivibrator controls a flip flop. The multivibrator oscillates as long as the buton S1 is pressed and the flip flop switches on and off with a frequency of several kilohertz. When the....
The circuit I used is a very common one. You can do a google search for 555 timer LED blinker and find hundreds of schematis that will fit the bill. Here is the schematic for my particular flavor of LED blinker: The variable resistor (100K) in the....
A homebrew 2M transceiver I wanted to use it mobile so I wouldn`t have been able to use a fist mike. I had the bright idea of using one of those cheap personal hands free kits you can buy for mobile phones, however once installed reality struck home - hardly....
This temperature controller employs an LM135/235/335 temperature sensor, can be used to keep small environment warm or hot. Here is the schematic diagram:....
This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone. The dial tone we heard when we pick up the phone set is call Dual Tone Multi-Frequency, DTMF in short. The name was given because the tone that....
The WWVB signal is broadcast as a 60 kHz carrier that is AM modulated with a time code frame that is updated once per minute. The data rate is one bit per second. Along with time code information, the data frame also contains synchronization bits, calendar....
Are you looking for a free schematic and pcb design tool? The gEDA project has produced and continues working on a full GPL`d suite and toolkit of Electronic Design ....
This is a simple touch switch circuit, the 555 timer is configured as a one shot multivibrator that is triggered by touching the touch terminal. In this monostable mode, the timer generates a fixed pulse of about 4 seconds whenever the trigger voltage falls....
The circuit is composed of lag comparator with A1 and inverting integrator A2, and the charging and discharging time constant is decided by integral resistors (R1+RP1) and the capacitor C1. VD1~VD5 form the limiter circuit. The maximum oscillation frequency....
This tiny circuit comprising of a single 3 terminal IC UM66 can be built small enough to be placed inside a greeting card and operated off a single 3V flat button cell. There is not much to the circuit. The UM66 is connected to its supply and its output fed....
