New Circuits Page 68
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This article briefly describes the NTSC-PAL TV Signal Identifier (LM1881). Although this circuit is very easy to understand, but also very practical. Circuit elements in depth understanding of the grasp of the principle is very effective. Do you know the....
-
-
A vacuum fluorescent display (VFD) tube is a type of tube which consists of a hot cathode (filaments), anodes (phosphor) under a high vacuum condition in a glass envelope. This clock uses tube types 8843 or 8894 made by Sylvania in the early seventies. The....
-
-
I`m using regular analog control via pots, though will use digital readouts of voltage/current. Anyhow. I HAVE watched the PSU videos, but at least in simulations I couldn`t get the single-LT308x with the transistor limiter to work properly (one, it didn`t....
-
The first switching LED driver that we will study is the buck converter. The buck converter is the simplest of the switching drivers, and is a step-down converter for applications where the load voltage is never more than about 85% of the supply voltage. The....
-
The simple circuit offers no isolation, but the simplicity of the circuit combined with cost of sound cards and the fact that diodes 1 and 2 add a good measure of protection makes this circuit ideal for the average user. Notice the physical hardware includes....
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-
-
The SC1088 is a bipolar integrated circuit for use in mono portable and pocket Radios It is used when a minimum of peripheral components (of small dimensions and low costs) is important. The circuit contains a frequency-locked-loop(FLL) system with an....
-
The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the....
-
All PIC IR Decoders share the same, easy to build, hardware. All parts for this hardware are easily obtainable throughout the world. Building it shouldn`t take very much longer than one evening. At the heart of the diagram is the PIC16F84 processor. It is....
-
The first versions operated from ±15V supplies, featured bandwidths of 50 MHz, and delivered slew rates in the low hundreds of volts per microsecond. Today`s fastest amplifiers run on ±5V supplies with bandwidths of 1. 4 GHz and slew rates of 6000V/ µsec.....
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-
The circuit was taken from one of the old elektor electronics magazine and it is indeed a very cute little circuit which may be used for creating high intensity lighting effects during festivals, parties and fun gatherings. Diodes D1 and D2 along with the....
-
The resistors could be 1/8w, The zener diode could be a 250mW part, or it could be a 1W part (1N number will be different). The electrolytic capacitor is plain vanilla, and the value can deviate (larger is ok, higher voltage is ok), but when it`s all done,....
-
Co-axial cable tester is used to test whether the co-axial cable is open or short circuit or good using digital IC 4001 circuit description with parts list and various project...
-
-
The recent Epilog Laser Challenge at Instructables. com got me thinking about building a low cost CNC laser. The engrave r they had as the prize had a list price of about $8, 000. The income tax on that would be quite a lot. I thought a larger more powerful....
-
The TPS61200 spec says GND is control/logic ground and PGND is power ground but this isn`t reflected in the symbols chosen in the diagram. I`m also puzzled why the link to earth is shown on GND rather than on PGND. From this key it seems that various parts....
-
-
This simple circuit can be used to program the PIC16F84 and similar "flash memory" type parts. It uses a cheap 555 timer IC to generate the programming voltage from a +5V rail, allowing the circuit to be powered from a computer`s USB port. The 555 timer....
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The following circuit shows about Tachometer Circuit Project. This circuit built based on the 555 Timer IC. Features: monostable IC, voltage ....
-
I have a copper mesh (10cm x 10cm square) in a vacuum chamber connected to a BNC connector by a 24-cm-long copper wire. The goal is to switch the mesh voltage (referenced to ground) from 8 V to ~0 V quickly. (This will switch the electric field in the....
-
R2_47R 1/4W Resistor D1_LED (Any dimension, shape and color) Q1_Infra-red Photo Transistor (Any cheap type) Q2_BC327 45V 800mA PNP Transistor SW1_SPST Toggle or Slide Switch (Optional, see Note) B1_3V Battery (2 x 1. 5V AA, AAA or smaller type Cells in....
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This was my very first arduino project. Its great for beginners. Fade the color or the lights my moving your hands near it. It fades from a pretty purple blue to a firey red-orange. Its was SUPER easy to build, not to hard to write the code, and its really....
-
This low-cost burglar alarm employs a 12V strobe light and a truck reversing horn as the visible and audible alarm outputs while the alarm itself is a 12V....
-
This is a simple alarm circuit for a checkup with a 4001. It can be used to protect our home, motorcycle, car or any other application that comes to mind. In this circuit will be a computer simulation with Livewire and then design the printed circuit Kicad.....
-
Enhancements include: analog front end, pin-to-pin compatibility (for existing designs), analog stabilized comparator and simplified external circuit design, improved time and temperature measurement and reduced current. TDC-GP21 is perfectly suited to....
-
-
Using an LM3915 VU meter LED bar graph driver?10 LEDs are driven?A simple audio amplifierdrives a detector circuit?which provides dc drive for the LM3915....
-
-
Unlike other alarm circuit that provide normally-open only or normally-closed only configuration, this alarm circuit work for both configurations. The....
-
This is a simple update to Mr. Hareendran s PIR Sensor Security Light circuit. It has a shortcoming limits the relay voltage to approximately 3.3V. While this may function with some 5V relays, it will not function with all. The nature of....
-
TR-55 was the first transistor radio produced and sold in Japan. It uses the following transistors: 2T51 (oscillator-mixer), 2 x 2T52 (for IF), 2T53 (AF driver) and 2T12. The very first commercially produced transistor radio was Regency TR-1 from October....
-
For all electrically conductive Fluid or liquid level measurement, this single-chip circuit is very compact and simple. This circuit is a voltage level sensor encouraged the AC bias supply for the sensor to prevent the electrolysis of the probes used. This....
-
This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and....
-
-
-
Here the simple mixer with 4 input and 2 op-amps: A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net g....
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Home built NMR spectrometer, showing the construction and circuitry. Demonstates 90 degree and 180 degree pulse sequence, and generation of FIDs and spin echos at 18 MHz....
-
-
Circuit To relieve you of any concern related to high frequency, I used a module ready, in case a module Aurel audio FM transmitter. This tiny circuit board with 2 cm by 4 cm supports a transmitter modulation frequency track, delivering an RF power of 10 mW....
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This program initializes all of the sixteen io lines of the U4x1 to be outputs. The lower four port pins of port A (A. 0 - A. 3) are "channel 1" when it concerns stepper activity, the upper four port pins of port A (A. 4 - A. 7) are "channel 2" when it....
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Don`t like your little brother`s TV channel selection? Hate the volume your wife sets the stereo at? Want to just annoy someone? This circuit does all that and more by jamming most IR remote signals. The circuit releases a flood of pulsing IR light that....
-
Part of this circuit is turning the analog signal coming from the reversed LED (sensing mode) and amplified by the op amp into a digital (on/off) signal. I got rid of all that. This is the modified simplified version of the schematics: Another possibility is....
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This is an amplifier circuit that has a high output power is 1400W mono, the audio amplifier circuit is very suitable when used in a large room, using a woofer speaker, and fullrange. To sound out very nice, loud sound and almost no noise. The amplifier....
-
-
This page features a replacement circuit for the LM3909 LED Flasher / Oscillator using discrete components. The circuit is functionally the same as the integrated LM3909 but has a minor variations in values of the components used. The LM3909 can still found....
-
A wireless temperature sensor so that temperature measurements can be made anywhere within the range of the transmitter and the receiver. There are many ways to achieve this. One of the simplest ways is to use a voltage to frequency conversion chip along....
-
This is a "beta release" schematic. Use at your own risk The idea is to add this circuitry to a board with already has ram at 2000 and an 82C55 I/O chip to provide ports A, B and C. Warning: not shown here is a memory mapping trick which is described below.....
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The password electronic doorbell circuit is composed of the electronic password circuit and music occurred circuit, and it is shown in Figure 3-118. Electronic password circuit consists of integrated circuits lCl and keys Sl-S6, diodes VDl-VD5. lCl is the....
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Here is a high performance radio receiver antenna amplifier for the entire VHF broadcast and PMR band (100-175 MHz) which can be successfully built without....
-
The UHF motion detector below operates on the Doppler radar principle. A radial signal is created by the oscillator (Q1). Some of this energy is reflected back....
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This mosfet fm transmitter circuit is designed to be used for aligning FM radio receivers. It has a microphone amplifier with automatic gain control. The FM modulation is a voltage oscillator and the final stage is built with MOSFETs. A lowpass filter at the....
-
This is circuit for audio equalizer that is very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. This circuit is like as equalizer bands. Here`s the circuit diagram of the audio equalizer....
-
The IR to RF transmitter circuit given here can convert the IR signals from your remote to RF signals to long distances. The circuit given here is a good one for extending the range of your IR remote. Also such systems does not need a line of sight since RF....
-
Every driver knows that a high intensity light striking one`s eyes can have dangerous consequencies. Cars have a dimmer switch to lower the light intensity but unfortunately, some auto headlamps are just too bright even if they are dimmed. The dimmer circuit....
-
This article celebrates in 2008 the 45 Years of the invention of PAL as well as to give an appriciation to the german television pioneer Prof. Dr. Eng. Walter Bruch, known as Papa PAL, Mister PAL or even among us collegues PAL pal . This document was first....
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By gluing a standoff to the center of the cone, an inexpensive 2", 8 ohm speaker becomes a vibration sensor with a naturalresonance below 100Hz which is quite good. My implementation is shown below: After the epoxy cured, the speaker was hung in the middle....
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Music Driven Motor Schematic. The geared motor drive the stem of a dancing flower to beat of music....
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General Diagram Of Motor Controller Manual PDF Download...
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This simple and cheap circuit is not just for Christmas! There are just two resistors, a small-signal transistor such as a BC547, one flashing` LED and a string of normal` LEDs. The flashing LED works as an oscillator and switches the transistor on and off;....
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Circuit This Circuit converts a voltage control output from a Process Controller to be converted into a Current Control if the AC-Drive or Valve needs a Current Control Signal. This is a three wire voltage to current loop converter. The 1-5 V DC is....
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I usually use an NPN Bipolar transistor to do the relay switching, mainly because my relays are 12v coil rated, but it also keeps everything nice and seperated. and yes i add a diode. with no problem. ( do I or did I need to drive it with a transistor ) but....
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An electromagnetic field probe designed to detect changing electric and magnetic fields....
-
The configuration bytes are probably all OK, but then maybe there is a problem in the communication part (writing bytes via SCCB). This is going well for the moment even though I haven`t reach goal yet, started yesterday, but I just wondered if you ever....
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Before I began building amateur rockets, I built and flew model rockets, starting in the summer of 1971. Looking for a greater challenge, the following year I decided to begin building my own rockets, entirely from scratch. Although my first rocket was a....
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This circuit could be used as a treble control circuit with high frequency gain occuring when R3 is set so a=b (we`ll call this k=0), and high frequency attenuation occuring when R3 is 22kOhms across a and b (k=1). So therefore, depending on R3`s setting,....
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Our eyes are very sensitive to light but they cannot see the IR (Infrared) radiations so it is some time difficult to test or check the equipments which emits infrared to confirm that either they are working or not. So here is the IR detector circuit which....
-
-
See as the circuit, it consists of the infrared sensor control circuit, relay control circuit, music generating circuit and so on, which can be used in infrared alarm, timing control and other spots....
-
-
Circuit Here is a low cost one touch door bell circuit using Bel 188 transistor. I think this may be the most cheap bell circuit that can be made. The core of this circuit is a output transformer of push-pull amplifier that often used in transistor radios....
-
-
-
A high quality stereo FM transmitter circuit is shown here. The circuit is based on the IC BA1404 from ROHM Semiconductors. BA1404 is a monolithic FM stereo modulator that has built in stereo modulator, FM modulator, RF amplifier circuitries. The FM....
-
Video Power amplifier circuit diagram. The scheme works only when using the compounds of AV where video and audio signals are sent separately. Not suitable for joints «HF » antenna cable. Make sure to include the video amplifier in the line of the video,....
-
This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; eg, a door or table. Basically, it amplifies and....
-
The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate the relay placing his hand on the card,....
-
The receiver has a bigger motor to drive the wheels and a smaller motor to drive the steering which is not proportional. You could add an extra channel to the receiver by using the spare latch. Again there is no separate on/off switch on the transmitter....
-
This circuit was purposely designed as a funny Halloween gadget. It should be placed to the rear of a badge or pin bearing a typical Halloween character image, e. g. a pumpkin, skull, black cat, witch, ghost etc. Two LEDs are fixed in place of the eyes of....
-
Agreeable, very close sound imitation, Suitable for sound effects, door-bells etc. This circuit generates a two-tone effect very much alike the cuckoo son....
-
This circuit is a frequency meter, low cost. It covers region 1HZ until 1MHZ. The IC1 schmitt trigger that it regulates the signal of entry and him changes in reasonable level suitable for the IC2-3-4. With the tenth pulse in the entry of IC2/1, is produced....
-
-
-
-
the circuit diagram is shown below. hopefully it is readable.if you`ve got a breadboard, lay one out first and make sure it all works!AGH sorry! Revis....
-
The PLL transmitter exciter has the functions of providing a stable, low noise, frequency-selectable RF signal and amplify it to a controllable output power sufficient to drive the power amplifier. It uses a PLL frequency synthesizer built with MC145151,....
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Let me begin by saying I built my buffer board with a specific project in mind but I`d like to present it here as more of a general application devic....
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This topic continues from the more general Passive Tone Control circuit, which begins using only passive filters. This circuit follows the previous design, although the component values are different and in an alternate configuration. An audio tone control....
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Schematic shows R4 at the emmiter of the transistor, as amb and majkel have suggested it should be between the opamp and transistor, this is also the correct configuration in the canamp. The amp i managed to get a look at has been modified and has had the....
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A device used to generate different types of electrical waveforms over a wide range of frequencies is called function generator. The most common wave forms are square, sawtooth, triangular or sine wave shapes (drawn from top to bottom). The drawing shows an....
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Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, it is not difficult to build a data transmission module and connect it to the corresponding header. As....
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This article is for those who wants to make their own car amplifier. The basics of calculation will be discussed below. If you have understand it you will be able to make car amplifier yourself. Actually the difficulty of designing the car power amplifier....
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This circuit allows a 240V mains appliance to be controlled remotely via low-voltage cabling and a pushbutton switch. The mains appliance (in this case, a light bulb) is switched with a suitably-rated relay. All of the electronics is housed in an ABS box....
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This is a simplified schematic diagram for a home-made scanning backlight driven by an Arduino, an open-source electronics prototyping platform. The Arduino monitors the VSYNC signal (input-lag compensated) and executes a backlight scanning sequence, using....
This article briefly describes the NTSC-PAL TV Signal Identifier (LM1881). Although this circuit is very easy to understand, but also very practical. Circuit elements in depth understanding of the grasp of the principle is very effective. Do you know the....
A vacuum fluorescent display (VFD) tube is a type of tube which consists of a hot cathode (filaments), anodes (phosphor) under a high vacuum condition in a glass envelope. This clock uses tube types 8843 or 8894 made by Sylvania in the early seventies. The....
I`m using regular analog control via pots, though will use digital readouts of voltage/current. Anyhow. I HAVE watched the PSU videos, but at least in simulations I couldn`t get the single-LT308x with the transistor limiter to work properly (one, it didn`t....
The first switching LED driver that we will study is the buck converter. The buck converter is the simplest of the switching drivers, and is a step-down converter for applications where the load voltage is never more than about 85% of the supply voltage. The....
The simple circuit offers no isolation, but the simplicity of the circuit combined with cost of sound cards and the fact that diodes 1 and 2 add a good measure of protection makes this circuit ideal for the average user. Notice the physical hardware includes....
The SC1088 is a bipolar integrated circuit for use in mono portable and pocket Radios It is used when a minimum of peripheral components (of small dimensions and low costs) is important. The circuit contains a frequency-locked-loop(FLL) system with an....
The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the....
All PIC IR Decoders share the same, easy to build, hardware. All parts for this hardware are easily obtainable throughout the world. Building it shouldn`t take very much longer than one evening. At the heart of the diagram is the PIC16F84 processor. It is....
The first versions operated from ±15V supplies, featured bandwidths of 50 MHz, and delivered slew rates in the low hundreds of volts per microsecond. Today`s fastest amplifiers run on ±5V supplies with bandwidths of 1. 4 GHz and slew rates of 6000V/ µsec.....
The circuit was taken from one of the old elektor electronics magazine and it is indeed a very cute little circuit which may be used for creating high intensity lighting effects during festivals, parties and fun gatherings. Diodes D1 and D2 along with the....
The resistors could be 1/8w, The zener diode could be a 250mW part, or it could be a 1W part (1N number will be different). The electrolytic capacitor is plain vanilla, and the value can deviate (larger is ok, higher voltage is ok), but when it`s all done,....
Co-axial cable tester is used to test whether the co-axial cable is open or short circuit or good using digital IC 4001 circuit description with parts list and various project...
The recent Epilog Laser Challenge at Instructables. com got me thinking about building a low cost CNC laser. The engrave r they had as the prize had a list price of about $8, 000. The income tax on that would be quite a lot. I thought a larger more powerful....
The TPS61200 spec says GND is control/logic ground and PGND is power ground but this isn`t reflected in the symbols chosen in the diagram. I`m also puzzled why the link to earth is shown on GND rather than on PGND. From this key it seems that various parts....
This simple circuit can be used to program the PIC16F84 and similar "flash memory" type parts. It uses a cheap 555 timer IC to generate the programming voltage from a +5V rail, allowing the circuit to be powered from a computer`s USB port. The 555 timer....
The following circuit shows about Tachometer Circuit Project. This circuit built based on the 555 Timer IC. Features: monostable IC, voltage ....
I have a copper mesh (10cm x 10cm square) in a vacuum chamber connected to a BNC connector by a 24-cm-long copper wire. The goal is to switch the mesh voltage (referenced to ground) from 8 V to ~0 V quickly. (This will switch the electric field in the....
R2_47R 1/4W Resistor D1_LED (Any dimension, shape and color) Q1_Infra-red Photo Transistor (Any cheap type) Q2_BC327 45V 800mA PNP Transistor SW1_SPST Toggle or Slide Switch (Optional, see Note) B1_3V Battery (2 x 1. 5V AA, AAA or smaller type Cells in....
This was my very first arduino project. Its great for beginners. Fade the color or the lights my moving your hands near it. It fades from a pretty purple blue to a firey red-orange. Its was SUPER easy to build, not to hard to write the code, and its really....
This low-cost burglar alarm employs a 12V strobe light and a truck reversing horn as the visible and audible alarm outputs while the alarm itself is a 12V....
This is a simple alarm circuit for a checkup with a 4001. It can be used to protect our home, motorcycle, car or any other application that comes to mind. In this circuit will be a computer simulation with Livewire and then design the printed circuit Kicad.....
Enhancements include: analog front end, pin-to-pin compatibility (for existing designs), analog stabilized comparator and simplified external circuit design, improved time and temperature measurement and reduced current. TDC-GP21 is perfectly suited to....
Using an LM3915 VU meter LED bar graph driver?10 LEDs are driven?A simple audio amplifierdrives a detector circuit?which provides dc drive for the LM3915....
Unlike other alarm circuit that provide normally-open only or normally-closed only configuration, this alarm circuit work for both configurations. The....
This is a simple update to Mr. Hareendran s PIR Sensor Security Light circuit. It has a shortcoming limits the relay voltage to approximately 3.3V. While this may function with some 5V relays, it will not function with all. The nature of....
TR-55 was the first transistor radio produced and sold in Japan. It uses the following transistors: 2T51 (oscillator-mixer), 2 x 2T52 (for IF), 2T53 (AF driver) and 2T12. The very first commercially produced transistor radio was Regency TR-1 from October....
For all electrically conductive Fluid or liquid level measurement, this single-chip circuit is very compact and simple. This circuit is a voltage level sensor encouraged the AC bias supply for the sensor to prevent the electrolysis of the probes used. This....
This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality. The Power Amplifier section employs only three transistors and a handful of resistors and....
Here the simple mixer with 4 input and 2 op-amps: A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net g....
Home built NMR spectrometer, showing the construction and circuitry. Demonstates 90 degree and 180 degree pulse sequence, and generation of FIDs and spin echos at 18 MHz....
Circuit To relieve you of any concern related to high frequency, I used a module ready, in case a module Aurel audio FM transmitter. This tiny circuit board with 2 cm by 4 cm supports a transmitter modulation frequency track, delivering an RF power of 10 mW....
This program initializes all of the sixteen io lines of the U4x1 to be outputs. The lower four port pins of port A (A. 0 - A. 3) are "channel 1" when it concerns stepper activity, the upper four port pins of port A (A. 4 - A. 7) are "channel 2" when it....
Don`t like your little brother`s TV channel selection? Hate the volume your wife sets the stereo at? Want to just annoy someone? This circuit does all that and more by jamming most IR remote signals. The circuit releases a flood of pulsing IR light that....
Part of this circuit is turning the analog signal coming from the reversed LED (sensing mode) and amplified by the op amp into a digital (on/off) signal. I got rid of all that. This is the modified simplified version of the schematics: Another possibility is....
This is an amplifier circuit that has a high output power is 1400W mono, the audio amplifier circuit is very suitable when used in a large room, using a woofer speaker, and fullrange. To sound out very nice, loud sound and almost no noise. The amplifier....
This page features a replacement circuit for the LM3909 LED Flasher / Oscillator using discrete components. The circuit is functionally the same as the integrated LM3909 but has a minor variations in values of the components used. The LM3909 can still found....
A wireless temperature sensor so that temperature measurements can be made anywhere within the range of the transmitter and the receiver. There are many ways to achieve this. One of the simplest ways is to use a voltage to frequency conversion chip along....
This is a "beta release" schematic. Use at your own risk The idea is to add this circuitry to a board with already has ram at 2000 and an 82C55 I/O chip to provide ports A, B and C. Warning: not shown here is a memory mapping trick which is described below.....
The password electronic doorbell circuit is composed of the electronic password circuit and music occurred circuit, and it is shown in Figure 3-118. Electronic password circuit consists of integrated circuits lCl and keys Sl-S6, diodes VDl-VD5. lCl is the....
Here is a high performance radio receiver antenna amplifier for the entire VHF broadcast and PMR band (100-175 MHz) which can be successfully built without....
The UHF motion detector below operates on the Doppler radar principle. A radial signal is created by the oscillator (Q1). Some of this energy is reflected back....
This mosfet fm transmitter circuit is designed to be used for aligning FM radio receivers. It has a microphone amplifier with automatic gain control. The FM modulation is a voltage oscillator and the final stage is built with MOSFETs. A lowpass filter at the....
This is circuit for audio equalizer that is very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. This circuit is like as equalizer bands. Here`s the circuit diagram of the audio equalizer....
The IR to RF transmitter circuit given here can convert the IR signals from your remote to RF signals to long distances. The circuit given here is a good one for extending the range of your IR remote. Also such systems does not need a line of sight since RF....
Every driver knows that a high intensity light striking one`s eyes can have dangerous consequencies. Cars have a dimmer switch to lower the light intensity but unfortunately, some auto headlamps are just too bright even if they are dimmed. The dimmer circuit....
This article celebrates in 2008 the 45 Years of the invention of PAL as well as to give an appriciation to the german television pioneer Prof. Dr. Eng. Walter Bruch, known as Papa PAL, Mister PAL or even among us collegues PAL pal . This document was first....
By gluing a standoff to the center of the cone, an inexpensive 2", 8 ohm speaker becomes a vibration sensor with a naturalresonance below 100Hz which is quite good. My implementation is shown below: After the epoxy cured, the speaker was hung in the middle....
Music Driven Motor Schematic. The geared motor drive the stem of a dancing flower to beat of music....
This simple and cheap circuit is not just for Christmas! There are just two resistors, a small-signal transistor such as a BC547, one flashing` LED and a string of normal` LEDs. The flashing LED works as an oscillator and switches the transistor on and off;....
Circuit This Circuit converts a voltage control output from a Process Controller to be converted into a Current Control if the AC-Drive or Valve needs a Current Control Signal. This is a three wire voltage to current loop converter. The 1-5 V DC is....
I usually use an NPN Bipolar transistor to do the relay switching, mainly because my relays are 12v coil rated, but it also keeps everything nice and seperated. and yes i add a diode. with no problem. ( do I or did I need to drive it with a transistor ) but....
An electromagnetic field probe designed to detect changing electric and magnetic fields....
The configuration bytes are probably all OK, but then maybe there is a problem in the communication part (writing bytes via SCCB). This is going well for the moment even though I haven`t reach goal yet, started yesterday, but I just wondered if you ever....
Before I began building amateur rockets, I built and flew model rockets, starting in the summer of 1971. Looking for a greater challenge, the following year I decided to begin building my own rockets, entirely from scratch. Although my first rocket was a....
This circuit could be used as a treble control circuit with high frequency gain occuring when R3 is set so a=b (we`ll call this k=0), and high frequency attenuation occuring when R3 is 22kOhms across a and b (k=1). So therefore, depending on R3`s setting,....
Our eyes are very sensitive to light but they cannot see the IR (Infrared) radiations so it is some time difficult to test or check the equipments which emits infrared to confirm that either they are working or not. So here is the IR detector circuit which....
See as the circuit, it consists of the infrared sensor control circuit, relay control circuit, music generating circuit and so on, which can be used in infrared alarm, timing control and other spots....
Circuit Here is a low cost one touch door bell circuit using Bel 188 transistor. I think this may be the most cheap bell circuit that can be made. The core of this circuit is a output transformer of push-pull amplifier that often used in transistor radios....
A high quality stereo FM transmitter circuit is shown here. The circuit is based on the IC BA1404 from ROHM Semiconductors. BA1404 is a monolithic FM stereo modulator that has built in stereo modulator, FM modulator, RF amplifier circuitries. The FM....
Video Power amplifier circuit diagram. The scheme works only when using the compounds of AV where video and audio signals are sent separately. Not suitable for joints «HF » antenna cable. Make sure to include the video amplifier in the line of the video,....
This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; eg, a door or table. Basically, it amplifies and....
The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate the relay placing his hand on the card,....
The receiver has a bigger motor to drive the wheels and a smaller motor to drive the steering which is not proportional. You could add an extra channel to the receiver by using the spare latch. Again there is no separate on/off switch on the transmitter....
This circuit was purposely designed as a funny Halloween gadget. It should be placed to the rear of a badge or pin bearing a typical Halloween character image, e. g. a pumpkin, skull, black cat, witch, ghost etc. Two LEDs are fixed in place of the eyes of....
Agreeable, very close sound imitation, Suitable for sound effects, door-bells etc. This circuit generates a two-tone effect very much alike the cuckoo son....
This circuit is a frequency meter, low cost. It covers region 1HZ until 1MHZ. The IC1 schmitt trigger that it regulates the signal of entry and him changes in reasonable level suitable for the IC2-3-4. With the tenth pulse in the entry of IC2/1, is produced....
the circuit diagram is shown below. hopefully it is readable.if you`ve got a breadboard, lay one out first and make sure it all works!AGH sorry! Revis....
The PLL transmitter exciter has the functions of providing a stable, low noise, frequency-selectable RF signal and amplify it to a controllable output power sufficient to drive the power amplifier. It uses a PLL frequency synthesizer built with MC145151,....
Let me begin by saying I built my buffer board with a specific project in mind but I`d like to present it here as more of a general application devic....
This topic continues from the more general Passive Tone Control circuit, which begins using only passive filters. This circuit follows the previous design, although the component values are different and in an alternate configuration. An audio tone control....
Schematic shows R4 at the emmiter of the transistor, as amb and majkel have suggested it should be between the opamp and transistor, this is also the correct configuration in the canamp. The amp i managed to get a look at has been modified and has had the....
A device used to generate different types of electrical waveforms over a wide range of frequencies is called function generator. The most common wave forms are square, sawtooth, triangular or sine wave shapes (drawn from top to bottom). The drawing shows an....
Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, it is not difficult to build a data transmission module and connect it to the corresponding header. As....
This article is for those who wants to make their own car amplifier. The basics of calculation will be discussed below. If you have understand it you will be able to make car amplifier yourself. Actually the difficulty of designing the car power amplifier....
This circuit allows a 240V mains appliance to be controlled remotely via low-voltage cabling and a pushbutton switch. The mains appliance (in this case, a light bulb) is switched with a suitably-rated relay. All of the electronics is housed in an ABS box....
This is a simplified schematic diagram for a home-made scanning backlight driven by an Arduino, an open-source electronics prototyping platform. The Arduino monitors the VSYNC signal (input-lag compensated) and executes a backlight scanning sequence, using....
