Top Circuits Page 139
- Page 139
-
This is the circuit diagram of the simplest lamp dimmer or fan regulator. The circuit is based on the principle of power control using a Triac. The circuit works by varying the firing angle of the Triac. Resistors R1, R2 and capacitor C2 are associated with....
-
-
-
The parallel interface transfers data 8 bits (or more) at the same time, using eight separate wires. It is essentially an extension of the data bus into the outside world. The parallel interface is ideal for inputting or outputting data from devices that are....
-
This Battery Back-up circuit can be added to surveillance systems or control like alarms to power the circuit during Mains power failure. the battery back-up will immediatly take up the load without any delay the circuit is simple to construct. Regulator IC....
-
This is a simple application of internal 10-bit ADC(analogto digital converter) of PIC16F676 microcontroller. you can use this circuit to measure up to 30 v dc. the possible applications are on bench top power supply or as a panel meter invarioussystem.....
-
Another method of testing the received signal strength on a Symphony based wireless network is with a homebrew signal meter. The National LMX2240 Intermediate Frequency Receiver has a certain pin called "RSSI Out". RSSI stands for relative signal strength....
-
-
In today s blog we re going to examine a bipolar chopper drive, a common method for precision current control in stepper motors....
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Though the Arduino has no problem catching the incoming sensor data (it typically executes code in the range of microseconds (1 millionth of a second), I was running into trouble passing the data between the Arduino and Max. Without getting too technical,....
-
One of the goals of Movable Party is to provide an interactive experience for audiences/participants. Since power will be generated from a hub motor attached to the rear wheel of each bike (see this post ), the speed of the rear wheel directly translates to....
-
Reverse Engineering an EVAP System - Part 1 My friend/coworker has a 1997 Volkswagen Jetta (I4) that throws an EVAP SYSTEM Countless mechanics have attempted to diagnose it; none have ....
-
The Accu charger circuit is very simple and easy to make, because it only requires a few components are also not more than 10 components. Besides easy charger circuit is also very cheap and very efficient. This circuit requires power supply from a....
-
This is a simple design for wideband output amplifier. The wideband amplifier is suitable for use as a 50 © transmission line driver. This circuit is built by CA3140. This is the figure of the circuit. This circuit, when used in conjunction with the function....
-
Borrowing techniques echo sounder used to measure ocean depth, distance measuring device can be made with an ultra sonic. Gauge this distance using the same circuit with Digital Clock in the last article, coupled with a series of transmitter and receiver....
-
Schematic diagram in hard copy relating to the computer CSIRAC. A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common....
-
Schematic diagram in hard copy relating to the compurter CSIRAC. Schematic diagram shows the detailed connections between all the components in a circuit. They are used to build the circuit and later for testing. For CSIRAC, the most common components were....
-
Schematic diagram in hard copy relating to the computer CSIRAC. Possible date 1961. A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the....
-
A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common components were vacuum tubes (valves), capacitors and resistors.....
-
-
There are other chips or programs that do blanking and fading in from the side which is a cool effect. Like the signs at the ballpark. I don`t think this one does that particular trick but I intend to find out! The clock goes into slot machine mode every n....
-
It is possible to apply switch-mode approaches to a silicon CMOS semiconductor process to fabricate a current-mode power amplifier with high gain and efficiency for use in 2. 4-GHz wireless applications. Amplification at 2. 4 GHz is necessary for a number of....
-
This broadband low-noise CMOS amplifier covers the ultrawideband (UWB) communications frequencies from 3.1 to 10.6 GHz with the aid of current-reuse techniques....
-
Millimeter-wave frequency bands are attractive for their wide available bandwidths. There are a number of ways to generate these signals but, for each type of oscillator, it is desirable to be able to tune the source electronically, as well as in a defined....
-
Designing a PLL synthesizer for modern mobile communications systems involves achieving the proper balance among a number of tradeoffs, including spurious levels and frequency switching speed....
-
-
By designing a current difference buffer amplifier (CDBA) circuit for fabrication in a commercial CMOS semiconductor process, the versatility of this component can be applied in a variety of applications....
-
By combining a current-reuse amplifier and switch based mixer, a dual-band receiver front end offers excellent performance with extremely low power consumption....
-
This two-stage design makes use of enhancement-mode pHEMT device technology to serve IEEE 802.11a, HiperLAN2, and HiSWANa local-area-network receivers....
-
In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....
-
This transimpedance amplifier employs a current-reuse stage and cascade differential stage to achieve a continuous gain tuning range of 15 dB and low noise figure of 1.061 dB at 2.4 GHz....
-
Understanding how quartz-crystal resonators operate can lead to designing crystal oscillators with improved stability and better noise performance....
-
-
By developing a low-noise frequency synthesizer at 2 GHz and applying a pair of doublers, it is possible to achieve low-phase-noise outputs past 8 GHz for digital microwave radios....
-
This broadband frequency-upconversion mixer, which has been simulated with and without a novel linearity-enhancement circuit, is suitable for multiple-standard wireless applications from 1. 0 to 10. 6 GHz. Wireless communications products continue to support....
-
An active component, a CDTA, can be used as the basis for a variety of different filter responses, selecting the different responses by changing bias current to the amplifier....
-
In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....
-
Dual channel thermometer is simple PIC ADC based project. It`s a inexpensive thermometer with low cost components. Don`t used any high sensitive or high cost sensor for thermometer. I am using only simple silicon diode. Dual channel means this thermometers....
-
An Arduino measuring the rotational speed of a basic computer fan. It was one of a number of YouTube videos I did as I was studying for a Masters in Computer Science. This particular module was an embedded systems programming course, with a bit of....
-
-
Mainly f. m. receivers are of the superhetrodyne variety. Before we go into any depth about f. m. radio receivers let`s consider the principal differences between a. m. and f. m. signals. At first glance it might seem I am merely stating the blinding obvious....
-
an electronic project to construct an LC meter project kit of exceptional accuracy to measure both inductance and capacitance - an inductance meter and capacitance meter all in one unit. It also is readily available as a comparatively inexpensive kit which....
-
-
an electronic project to build a multivibator as a basic first test instrument - ideal for trouble shooting radio repairs. Includes a how to use guide. An excellent beginner project....
-
-
The Wien-bridge oscillator is a unique circuit because it generates an oscillatory output signal without having a sinusoidal input source. Instead, it uses capacitors with initial voltages to create the output. This circuit can be especially useful if....
-
The musical signal`s form does never resemble a square wave. The frequency range perceived by an average adult hardly goes above 17KHz. Hence I do not give a dime to those heated discussions whether it`s appropriate to test audio amplifiers using a 100KHz....
-
-
-
-
-
This lm338-v. 1power supply will be able to give something like two times 12- 36 volt and 2x5 amps (10 amps in the v. 2 of this PSU witch includes transistors to get more current from the circuit). I use 2 x lm338 in V. 1 but also lm317 can be used. I will....
-
This describes my original design dual channel quantizer inspired by Chris List`s ARP Style CV Quantizer design. My new implementation is an intelligent design that exploits the programmability of a Microchip PIC16F84. It will quantize voltages in 1/12 volt....
-
Here I am going to explain you how to make a wireless car. With the advent of IC`s, it has become very simple. Some registers are also required. To make your work simpler I would recommend to go to an Electronics Shop and ask for wireless Car 413 Mhz ASK....
-
The time constant of R1C1 determines the low-cutoff frequency while the time constant of R2C2 determines the high cutoff frequency. The pass-band gain, Avpass=R2/R1. For a low-cut filter, that is a high-pass filter, Za must be capacitors and Zb resistors. By....
-
The same equations can also be applied to D2, R5 and R6 which forms the negative non-linearity of the circuit, although all the signs should be inverted for the threshold voltage equation. Between the positive and negative threshold voltages, only the....
-
Here are instructions to turn such a tester into a not-so-precise analog display to monitor the CPU load on a Linux system, controlled by a serial port. You can build two variants of the display: - An AA Duracell battery with a tester. Energizer testers....
-
This little project was inspired by the Availabot from Schulze and Webb ( ). The Availabot is a puppet guy that rises to its feet when a friend comes online on IM, and falls over when the friend disappears. It`s a cool little toy, but it has 3 shortcomings:....
-
Any microcontroller in the ATmegaXX8 family should work, though if you`re going to go to the trouble of building this, spending a few tens of cents on extra flash memory seems like a prudent idea. A DIP socket is, strictly speaking, optional, but not having....
-
There are various obvious methods of rust removal, but these methods are unsuitable for very old or valuable artifacts as they tend to be destructive in use, meaning that along with the rust some of the base metal is also removed. Dissolving the rust with....
-
Very Low Frequency (VLF) radio signals and earth currents, and probably even fewer could really care about it. However, there are those who have a serious interest in such things, and actively persue the monitoring and recording of the effects, whilst....
-
A N2PK VNA that it would be useful for antenna measurements and wanted to run it with a laptop PC. As most newer laptops do not have a parallel port on them I decided to explore running it off the USB port. USB has its attractions when it works properly and....
-
This page contains tesla coil measurements using signal generators, frequency counters, oscilloscope etc....
-
-
-
The project I present here is my attempt at a universal QRP T/R switch. The idea is to take care of the essentials, so that any QRP (i. e. , less than 10W) receiver *AND* CW transmitter can be connected, and work seamlessly. These are what I considered the....
-
-
The user interface will consist of a single button and several LEDs or a RGB LED through which all user communication will occur. An overview of the proposed system states and transitions is given below. Pressing the button will wake the device up from sleep....
-
It is probably the most stable VFO oscillator known. Vackar configuration is rarely used because of known reason. (The NIH, not-invented-here syndrome). The frequency tuning range is above 2. 5, not observable in any other type of oscillator. The Coupling....
-
All the mods were sourced through the Mssiah forum, so thanks to all for sharing. I`ve tried to credit all those responsible, and to help anyone else wanted to do the same I`ve also added a few photos of my build. RCA soldered to GND and rearside of....
-
The concept is that a pair of yellow LEDs are placed in an otherwise inconspicuous pumpkin, and a photo sensor allows the circuit to turn on the lights at night. The circuit itself is very straightforward, incorporating minimal components. There are two....
-
This is a slightly less professional-looking version of Handmade Electronic Music, with almost identical content (and free!). See in particular Chapters 18 and 20. Layout of conductive metal strips under the breadboard performations. There are generally two....
-
A class-A audio amplifier is pretty wasteful of power but when plenty of power is available the simplicity is attractive. Here is a simple darlington transistor example intended for use with a 5 volt power supply. This circuit and the following aren`t for....
-
Free-energy" or "G-solar energy" as solar infrared radiation energy stored in the gravitational field. Alternative terms: "Aether heat", "2nd-material layer Heat" In the link below, professor KonstantinMeyldescribes in detail simple experimental setting of....
-
Afshin Izadian at Indiana University has invented a new power inverter that employs just a single switching transistor and generates infinite-level voltages....
-
A diode is used in series to drop the voltage down to 5. 4 V as the operating voltage for the PIC microcontroller should be below 5. 5 V. Besides, the diode also provides the protection to the circuit in case of reverse polarity of the power supply. I have....
-
-
-
-
This is the circuit diagram of the simplest lamp dimmer or fan regulator. The circuit is based on the principle of power control using a Triac. The circuit works by varying the firing angle of the Triac. Resistors R1, R2 and capacitor C2 are associated with....
The parallel interface transfers data 8 bits (or more) at the same time, using eight separate wires. It is essentially an extension of the data bus into the outside world. The parallel interface is ideal for inputting or outputting data from devices that are....
This Battery Back-up circuit can be added to surveillance systems or control like alarms to power the circuit during Mains power failure. the battery back-up will immediatly take up the load without any delay the circuit is simple to construct. Regulator IC....
This is a simple application of internal 10-bit ADC(analogto digital converter) of PIC16F676 microcontroller. you can use this circuit to measure up to 30 v dc. the possible applications are on bench top power supply or as a panel meter invarioussystem.....
Another method of testing the received signal strength on a Symphony based wireless network is with a homebrew signal meter. The National LMX2240 Intermediate Frequency Receiver has a certain pin called "RSSI Out". RSSI stands for relative signal strength....
In today s blog we re going to examine a bipolar chopper drive, a common method for precision current control in stepper motors....
Though the Arduino has no problem catching the incoming sensor data (it typically executes code in the range of microseconds (1 millionth of a second), I was running into trouble passing the data between the Arduino and Max. Without getting too technical,....
One of the goals of Movable Party is to provide an interactive experience for audiences/participants. Since power will be generated from a hub motor attached to the rear wheel of each bike (see this post ), the speed of the rear wheel directly translates to....
Reverse Engineering an EVAP System - Part 1 My friend/coworker has a 1997 Volkswagen Jetta (I4) that throws an EVAP SYSTEM Countless mechanics have attempted to diagnose it; none have ....
The Accu charger circuit is very simple and easy to make, because it only requires a few components are also not more than 10 components. Besides easy charger circuit is also very cheap and very efficient. This circuit requires power supply from a....
This is a simple design for wideband output amplifier. The wideband amplifier is suitable for use as a 50 © transmission line driver. This circuit is built by CA3140. This is the figure of the circuit. This circuit, when used in conjunction with the function....
Borrowing techniques echo sounder used to measure ocean depth, distance measuring device can be made with an ultra sonic. Gauge this distance using the same circuit with Digital Clock in the last article, coupled with a series of transmitter and receiver....
Schematic diagram in hard copy relating to the computer CSIRAC. A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common....
Schematic diagram in hard copy relating to the compurter CSIRAC. Schematic diagram shows the detailed connections between all the components in a circuit. They are used to build the circuit and later for testing. For CSIRAC, the most common components were....
Schematic diagram in hard copy relating to the computer CSIRAC. Possible date 1961. A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the....
A schematic diagram shows the detailed connections between all the components in a circuit. Such diagrams were used to build circuits and later for testing. For CSIRAC, the most common components were vacuum tubes (valves), capacitors and resistors.....
There are other chips or programs that do blanking and fading in from the side which is a cool effect. Like the signs at the ballpark. I don`t think this one does that particular trick but I intend to find out! The clock goes into slot machine mode every n....
It is possible to apply switch-mode approaches to a silicon CMOS semiconductor process to fabricate a current-mode power amplifier with high gain and efficiency for use in 2. 4-GHz wireless applications. Amplification at 2. 4 GHz is necessary for a number of....
This broadband low-noise CMOS amplifier covers the ultrawideband (UWB) communications frequencies from 3.1 to 10.6 GHz with the aid of current-reuse techniques....
Millimeter-wave frequency bands are attractive for their wide available bandwidths. There are a number of ways to generate these signals but, for each type of oscillator, it is desirable to be able to tune the source electronically, as well as in a defined....
Designing a PLL synthesizer for modern mobile communications systems involves achieving the proper balance among a number of tradeoffs, including spurious levels and frequency switching speed....
By designing a current difference buffer amplifier (CDBA) circuit for fabrication in a commercial CMOS semiconductor process, the versatility of this component can be applied in a variety of applications....
By combining a current-reuse amplifier and switch based mixer, a dual-band receiver front end offers excellent performance with extremely low power consumption....
This two-stage design makes use of enhancement-mode pHEMT device technology to serve IEEE 802.11a, HiperLAN2, and HiSWANa local-area-network receivers....
In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....
Understanding how quartz-crystal resonators operate can lead to designing crystal oscillators with improved stability and better noise performance....
This broadband frequency-upconversion mixer, which has been simulated with and without a novel linearity-enhancement circuit, is suitable for multiple-standard wireless applications from 1. 0 to 10. 6 GHz. Wireless communications products continue to support....
An active component, a CDTA, can be used as the basis for a variety of different filter responses, selecting the different responses by changing bias current to the amplifier....
In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....
Dual channel thermometer is simple PIC ADC based project. It`s a inexpensive thermometer with low cost components. Don`t used any high sensitive or high cost sensor for thermometer. I am using only simple silicon diode. Dual channel means this thermometers....
An Arduino measuring the rotational speed of a basic computer fan. It was one of a number of YouTube videos I did as I was studying for a Masters in Computer Science. This particular module was an embedded systems programming course, with a bit of....
Mainly f. m. receivers are of the superhetrodyne variety. Before we go into any depth about f. m. radio receivers let`s consider the principal differences between a. m. and f. m. signals. At first glance it might seem I am merely stating the blinding obvious....
an electronic project to construct an LC meter project kit of exceptional accuracy to measure both inductance and capacitance - an inductance meter and capacitance meter all in one unit. It also is readily available as a comparatively inexpensive kit which....
an electronic project to build a multivibator as a basic first test instrument - ideal for trouble shooting radio repairs. Includes a how to use guide. An excellent beginner project....
The Wien-bridge oscillator is a unique circuit because it generates an oscillatory output signal without having a sinusoidal input source. Instead, it uses capacitors with initial voltages to create the output. This circuit can be especially useful if....
The musical signal`s form does never resemble a square wave. The frequency range perceived by an average adult hardly goes above 17KHz. Hence I do not give a dime to those heated discussions whether it`s appropriate to test audio amplifiers using a 100KHz....
This lm338-v. 1power supply will be able to give something like two times 12- 36 volt and 2x5 amps (10 amps in the v. 2 of this PSU witch includes transistors to get more current from the circuit). I use 2 x lm338 in V. 1 but also lm317 can be used. I will....
This describes my original design dual channel quantizer inspired by Chris List`s ARP Style CV Quantizer design. My new implementation is an intelligent design that exploits the programmability of a Microchip PIC16F84. It will quantize voltages in 1/12 volt....
Here I am going to explain you how to make a wireless car. With the advent of IC`s, it has become very simple. Some registers are also required. To make your work simpler I would recommend to go to an Electronics Shop and ask for wireless Car 413 Mhz ASK....
The time constant of R1C1 determines the low-cutoff frequency while the time constant of R2C2 determines the high cutoff frequency. The pass-band gain, Avpass=R2/R1. For a low-cut filter, that is a high-pass filter, Za must be capacitors and Zb resistors. By....
The same equations can also be applied to D2, R5 and R6 which forms the negative non-linearity of the circuit, although all the signs should be inverted for the threshold voltage equation. Between the positive and negative threshold voltages, only the....
Here are instructions to turn such a tester into a not-so-precise analog display to monitor the CPU load on a Linux system, controlled by a serial port. You can build two variants of the display: - An AA Duracell battery with a tester. Energizer testers....
This little project was inspired by the Availabot from Schulze and Webb ( ). The Availabot is a puppet guy that rises to its feet when a friend comes online on IM, and falls over when the friend disappears. It`s a cool little toy, but it has 3 shortcomings:....
Any microcontroller in the ATmegaXX8 family should work, though if you`re going to go to the trouble of building this, spending a few tens of cents on extra flash memory seems like a prudent idea. A DIP socket is, strictly speaking, optional, but not having....
There are various obvious methods of rust removal, but these methods are unsuitable for very old or valuable artifacts as they tend to be destructive in use, meaning that along with the rust some of the base metal is also removed. Dissolving the rust with....
Very Low Frequency (VLF) radio signals and earth currents, and probably even fewer could really care about it. However, there are those who have a serious interest in such things, and actively persue the monitoring and recording of the effects, whilst....
A N2PK VNA that it would be useful for antenna measurements and wanted to run it with a laptop PC. As most newer laptops do not have a parallel port on them I decided to explore running it off the USB port. USB has its attractions when it works properly and....
This page contains tesla coil measurements using signal generators, frequency counters, oscilloscope etc....
The project I present here is my attempt at a universal QRP T/R switch. The idea is to take care of the essentials, so that any QRP (i. e. , less than 10W) receiver *AND* CW transmitter can be connected, and work seamlessly. These are what I considered the....
The user interface will consist of a single button and several LEDs or a RGB LED through which all user communication will occur. An overview of the proposed system states and transitions is given below. Pressing the button will wake the device up from sleep....
It is probably the most stable VFO oscillator known. Vackar configuration is rarely used because of known reason. (The NIH, not-invented-here syndrome). The frequency tuning range is above 2. 5, not observable in any other type of oscillator. The Coupling....
All the mods were sourced through the Mssiah forum, so thanks to all for sharing. I`ve tried to credit all those responsible, and to help anyone else wanted to do the same I`ve also added a few photos of my build. RCA soldered to GND and rearside of....
The concept is that a pair of yellow LEDs are placed in an otherwise inconspicuous pumpkin, and a photo sensor allows the circuit to turn on the lights at night. The circuit itself is very straightforward, incorporating minimal components. There are two....
This is a slightly less professional-looking version of Handmade Electronic Music, with almost identical content (and free!). See in particular Chapters 18 and 20. Layout of conductive metal strips under the breadboard performations. There are generally two....
A class-A audio amplifier is pretty wasteful of power but when plenty of power is available the simplicity is attractive. Here is a simple darlington transistor example intended for use with a 5 volt power supply. This circuit and the following aren`t for....
Free-energy" or "G-solar energy" as solar infrared radiation energy stored in the gravitational field. Alternative terms: "Aether heat", "2nd-material layer Heat" In the link below, professor KonstantinMeyldescribes in detail simple experimental setting of....
Afshin Izadian at Indiana University has invented a new power inverter that employs just a single switching transistor and generates infinite-level voltages....
A diode is used in series to drop the voltage down to 5. 4 V as the operating voltage for the PIC microcontroller should be below 5. 5 V. Besides, the diode also provides the protection to the circuit in case of reverse polarity of the power supply. I have....
