New Circuits Page 76
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This is a mini FM transmitter built and powered using 2 transistors, designed by Tony van Roon. This small transmitter is simple to build and its transmissions could be picked up on any common FM radio. It possesses a range of approximately 1/4-mile (400....
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To avoid the deep discharge that can destroy or shorten the life of a rechargeable battery, you must disconnect its load before the discharge is complete Circuit Protects Against AC Line Disturbances : 07/29/98 EDN-Design Ideas / operates by switching off....
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A 10 MHz crystal is typically 4 ohms at its series resonance and 40 kiloohms at its parallell resonance. To get low sideband noise the power dissipated in the crystal has to be reasonably large, the design used here dissipates 0. 2mW in the crystal, 7mA and....
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The following circuit shows about Fully Linear Diode Sensor Circuit Diagram. This circuit based on the A748 IC. Features: opamp as ....
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This DS18S20 digital thermometer provides a precision of 0. 5 °C and SCRATCHPAD it`s read at every 800ms. Capacitors C5, C6 and diodes D8, D8 makes a voltage doublers which power the lcd panel. The DS18S20 temperature sensor it`s wrapped in a thermo....
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This circuit uses an SAD 512D (Reticon) chip, which is a 512-stage analog shift register. By varying the clock frequency between 5 and 50 kHz, delay time can be set between 51. 2 and 5. 12 ms. The clock fre-quency must be at least twice the highest audio....
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A Simple Transistor Based Motorcycle Alarm Circuit This is a simple - easy to build - transistor based motorcycle alarm. It`s designed to work at 12-volts. But - if you change the relay for one with a 6-volt coil - it`ll protect....
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When starting with Arduino, one soon has much more Arduino boards then RS232 or even USB ports on the computer. So that, it seems more useful to put the signal level converter to an external adapter than directly on the Arduino board. Usually, one has (I....
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I have few Kenwood TK-760G-1 transceivers (two-way radios) and they all were programmed to one channel and all other features were locked. In the internet and in local newsgroup I collected various software for Kenwood programming. All I needed is....
-
Electronic ballasts for dimming fluorescent lamps require a control interface for the user to set the desired lamp-brightness level. Existing interface circuits include a 1-to-10-Vdc interface, digitally-addressable lighting interface (DALI), triac-based....
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-
The circuit was based on a single operational amplifier integrated circuit that is made to produce a modular preamplifier which functions in the Class A o....
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This is the DC switching regultor Voltage 5V at current 3A. It is make for digital circuit. The important part of the circuit is LM2673, it is 3A Step-Down....
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Universal motor control with built-in self-timer. Use this circuit only with motors having commutators. If heavy motor loads are anticipated, use a larger-rated C30B SCR in place of the GE-X1 for SCR2. To increase the time delay increase the capacitance of....
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Circuit is based basically on quite well tested my simple microphone preamplifier. I have built one prototype of this circuit and it worked nicely. Soundblaster soundcard series (SB16, SB32, AWE32 and AWE64) have all a microphone input designed to be used....
-
Presented schematic shows how to build simple PIR motion detector sensor. PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and....
-
This page is a revised version of the original submission of an article entitled "Better Bachmann Sound For Under A Buck" published in the Feb. 1998 issue of Garden Railways Magazine. Editorial changes and additional artwork that might have been added by....
-
The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can use ignition transformer from automotive engine. A fly-back transformer is possibly usable too. The 4049 will drive the....
-
A DIY intervalometer for my Sony NEX 5N camera so that I could do time-lapse photography. This intervalometer should work with most Sony cameras: NEX, Alpha and other. To work intervalometer used infrared LED Serial LCD has 4 output: GND, VCC, SDA, SCL. SDA....
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The circuit of automatic emergency light presented here has the following features: 1. When the mains supply (230V AC) is available, it charges a 12V battery up to 13. 5V and then the battery is disconnected from the charging section. 2. When the battery....
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The crime prevention bell device that I produced about 20 years ago works still in the active service. It worked many times to make the thief not operate well and not go into it. The bell keeps ringing generally though the bell rings as for the crime....
-
This Resonance generators (oscillating sound generator) circuit, designed using CMOS integrated circuit number 4011(CMOS Quad 2-Input NAND Gate). Contains within 4 nand gate. To each oscillator circuit has a 2 circuit. This circuit provides a higher....
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It is important yet to mention that the 74HC240 can drive directly an IRF510 FET transistor being able to give until 10W. Another application is using it to drive a balanced diode mixer, which needs a considerable power drive, easily supplied by a 74HC240....
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BFP640 used for 1575 MHz Global Positioning Satellite (GPS) Applications BFP640 is investigated for use as an LNA for 1575 MHz GPs Design Goals: Gain = 16 dB min, Noise Figure -14. 8 dBm min Printed Circuit Board used is Infineon Part..
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Did you know you can build your own home intercom? Read our instructions and find a circuit of a versatile home intercom system. The unit is able to communicate to as many as ten different locations or rooms discretely and incorporates a single change over....
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This months project is based on the 4017 chip that we used in a project last month. If you haven`t had a chance to review the basics of the 4017 chip you may want to review the info presented in June`s project of the month. As you can see see we have changed....
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Sometimes the need arises to construct a really simple oscillator. This could hardly be simpler than the circuit shown here, which uses just three compone....
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The STK672-050 is a unipolar constant-current chopper- type externally-excited 4-phase stepping Motor Driver hybrid IC which uses MOSFET power devices. It has a microstep operation-supported 4-phase distributed con- troller built-in to realize a high torque,....
-
A relay is an electro-mechanical switch that opens and closes under the control of another electric circuit. When current flows through the coil of the relay, a magetic field is created that causes an armature to move, either making or breaking an electrical....
-
The electric fence control circuit is composed of the +6 V power supply circuit, high-voltage output circuit, trigger control circuit, alarm circuit and protection circuit, and it is shown in Figure 4-30. +6 V power supply circuit is composed of the power....
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This is a very simple and easy to make IR receiver circuit. This infrared receiver circuit is using only few components and it is able to receive 38KHz carrier signal. The working of this circuit is simple when ever the IR LED receive any signal from 38KHz....
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-
The SC41343 is designed as one kind of infrared, ultrasonic or RF remote control launch coding circuit. The internal circuit is composed of the sequence generator, control logic circuit?4-bit shift register?data extraction circuit and the latch circuit.....
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Covering FM radio reception frequency, by adjusting the L value (La stretch or compression coil L) can easily change the transmission frequency to avoid the FM radio. Transmit signal coupled to the antenna through C4 to launch out...
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Tone is made adjustable by using multiposition switch to change capacitors in oscillator circuit. Speed (rate of change in frequency) of siren is adjusted with R3. 4700-ohm resistor in series with R3 keeps siren op-erational when R3 is rotated to....
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-
-
Included on this page are various small circuits I have created over time. Some are trivial, some are a bit more complex, but hopefully all are useful in a variety of projects. Most include both the schematics as well as the source ( KiCad ) files. This is a....
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Applications 900 MHz ISM Band, Satellite TV LNB IF Amplifiers (950 - 2150 MHz), 1575 MHz GPs 2. 4 GHz ISM Band (802. 11 b/g WLAN, Cordless, etc. ), "SDARS" Satellite - based Radio (2. 33 and 2. 6 GHz), 5 - 6 GHz WLAN (802. 11a), 5 GHz Cordless Phones, etc.....
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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....
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-
HI, i Just wanted to understand this circuit better and discuss with people So here it is a ,crystal oscillator It uses a 3.5Mhz Crystal and....
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The amateur radio call sign W9VES has been assigned to ”held by, as ham radio operators like to put it ”only two people, of whom I am the second. My maternal uncle, Phil Simmons, was the first W9VES, and I enjoy my amateur radio in celebration of him. By....
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This Low Dropout Voltage (LDO) solar charge controller uses a simple differential amplifier and series P channel MOSFET linear regulator --their compatibil....
-
Controlling the speed of three phase ac motor is done by controlling the frequency of the power line supply,? since the motor is synchronized with the line...
-
All resistors are 5 or 10 percent tolerance, 1/4-watt all capacitors are 10 percent tolerance, rated 35 volts or higher. This circuit amplifies the output of a regular electret condenser microphone quite nicely. adjust sensitivity by turning R1..
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The following circuit shows about Complete Solid state M-9 Power Amplifier Circuit Diagram. Features: DC servo make a loudspeaker protect circuit, ....
-
This is a design circuit for a simple 27MHz transmitter producing a carrier. The circuit can produces an unmodulated 27MHz signal and when picked up by a receiver. This is the figure of the circuit; The transmitter is a very simple crystal oscillator. The....
-
In the circuit diagram for the Joule Thief, the common point of the toroid is the connection at the top of the hand-wound ferrite toroid, in the upper right of the diagram. This goes to the positive end of the battery. The other two wires from the toroid go....
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The distortion produced by a typical solid-state Class-B power amplifier is shown to consist of eight mechanisms, all of which may co- exist and whose distortion products overlap to give a complex result. Methods for isolating each mechanism for study, and....
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-
-
National Semiconductor has been producing and designing ICs for use in switch-mode power supplies for many years. The application of these devices is norm....
-
LM3914 Dot Bar Display Driver LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 20 Led stereo Vu Metre Devresi PCB Circuit LM3914 10 leds stereo vumeter circuit diagram of Eagle PCB drawing of eagle ..
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A one shot multivibrator generate a fixed width pulse at the output when the input is triggered. This fixed width output should be consistent, regardless the....
-
Here is the circuit schematic of a simple audio surveillance system in which the transmitter will pickup sound from one location and the receiver at other location will reproduce it. The receiver and transmitter are connected by only one set of wire. Here....
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-
The Saver V5. 0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated....
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Peripheral circuit is very simple, it is DAC schematic circuit diagram of the USB interface which adopts PCM2702 to make the picture, the Ausgang of circuit can be connected with the power amplifier directly, can drive earphone of more than 32 ohms too...
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This project was inspired by a circuit that a friend of mine, Simon Field, over at Scitoys. com showed me. He had built a very simple transmitter circuit out of a 1Mhz "can" oscillator and a serial connector (see it here ) In his circuit he used a computer....
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Can someone please help explain to me how this circuit works? I am pretty sure I understand how the voltage divider network works. I am pretty sure I....
-
-
By removing harmonics from a square wave, this circuit generates an accurate and adjustable sine-wave output....
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-
-
Both transistors should be low noise types. In the original circuit, is used BC650C which is an ultra low noise device. These transistors are now hard to find but BC549C or BC109C are a good replacement. The circuit is self stabilizing and will set its....
-
This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and normally-open contacts, and a 24-hour Personal Attack/Tamper zone. It is connected permanently to the 12-volt supply and its....
-
Typical solutions for vertical movement of probe of bed profiling devices (guide wheels, dumpers, brakes, backlash and vibration suppressors not shown). Figure 7. Pictorial description of a complete mechanism for vertical motion of a bed profiler; the....
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The circuit of graphic equalizer, allocates ten adjusting potesometer , that each one from them affects in a predetermined area of frequencies, the central frequency of which abstains a octave (double), from the central frequencies of her neighbouring....
-
Visit eBid United Kingdom, the Online Marketplace without the Fees - buy and sell today....
-
This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around a standard reflective opto-sensor CNY70(IC1). In some disciplines, a line following robot or an....
-
This LED lamp was originally designed for use on a budget solar-charged 12V electrical system. It is bright enough for comfortable reading at night and features constant LED brightness with diminishing battery voltage. The circuit uses six high-brightness....
-
The 555 Astable generates a clock for this circuit, an oscillator giving a square wave output at pin 3 which is counted by 4017 to give a running lights effect. The decade counter-divider CD4017 has 10 outputs, for every low to high transition at the clock....
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Install the red LED at D2. Align the flat side of the LED with the PCB outline. Install a jumper wire at R4 and install a 220uF electrolytic cap at C8 with the negative side to ground. Connect pin2 of J4 to the AGC input on the 612 HF mixer...
-
This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful....
-
-
As the name implies,emergency light is a source of light available during an emergency.It is an automatic system in which a rechargeable battery operated l....
-
The following circuit is a cheap completely transistorised inverter circuit ideal for driving medium loads with the order of 40 to 60 watts working with battery of 12V, 15 Ah or larger power capacity. Transistors T1 and T2 (BC548) make a 50Hz multivibrator.....
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-
The MLX90224 series are dual Hall effect Latches It includes two Hall effect latch functions of which typical thresholds are +/- 2. 0 mT. In each latch, the magnetic flux detection is performed by a switched silicon Hall plate. The BOP and BRP are....
-
This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only special` component in the circuit is a window discriminator (a fancy version of a window comparator). Resistors R1 and....
-
Low Cost Water Pump Controller Circuit. The sensors applied to the circuit could be any two conducting probes, preferably resistant to electrolytic corrosion. For example, in the easiest case, a appropriately sealed audio jack could be utilized to operate as....
-
Chipmunk BASIC has lots off useful functions. So I wrote a small BASIC file to read the serial port and then plot the value on screen (Avaliable upon request FREE). The desktop 386SX PC has a 1. 44 FD and a 40M HD, a VGA with 256k of VRAM. BIOS was configure....
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A very simple split power supply circuit project can be designed using this schematic diagram which is based on a LM380 audio power IC. The regulation of the output voltage depends of the upon circuit feeding the LM380. The power dissipation is around 1 watt....
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National Instruments Multisim now has microcontroller unit co-simulation capabilities, allowing you to include a microcontroller, programmed in assembly or C code, within your SPICE modeled circuit. The MCU functionality in Multisim enables students,....
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The idea for this crystal tester circuit sprung out of the need of testing a large number of oscillator crystals lying unused in a big hobby box. testing the crystals one by one without the appropriate device would have been very slow and a time consuming....
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Hello, this is my first post here. I built several versions of JFET static charge detectors and I`m seeing some differences I can`t explain so I`m....
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The water resource is being turned into a valuable rare resource. So, popularizing the water-saving irrigation has already become countries all over the world in order to relieve the water resource crisis and realize the inevitable choice of agricultural....
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This is a mini FM transmitter built and powered using 2 transistors, designed by Tony van Roon. This small transmitter is simple to build and its transmissions could be picked up on any common FM radio. It possesses a range of approximately 1/4-mile (400....
To avoid the deep discharge that can destroy or shorten the life of a rechargeable battery, you must disconnect its load before the discharge is complete Circuit Protects Against AC Line Disturbances : 07/29/98 EDN-Design Ideas / operates by switching off....
A 10 MHz crystal is typically 4 ohms at its series resonance and 40 kiloohms at its parallell resonance. To get low sideband noise the power dissipated in the crystal has to be reasonably large, the design used here dissipates 0. 2mW in the crystal, 7mA and....
The following circuit shows about Fully Linear Diode Sensor Circuit Diagram. This circuit based on the A748 IC. Features: opamp as ....
This DS18S20 digital thermometer provides a precision of 0. 5 °C and SCRATCHPAD it`s read at every 800ms. Capacitors C5, C6 and diodes D8, D8 makes a voltage doublers which power the lcd panel. The DS18S20 temperature sensor it`s wrapped in a thermo....
This circuit uses an SAD 512D (Reticon) chip, which is a 512-stage analog shift register. By varying the clock frequency between 5 and 50 kHz, delay time can be set between 51. 2 and 5. 12 ms. The clock fre-quency must be at least twice the highest audio....
A Simple Transistor Based Motorcycle Alarm Circuit This is a simple - easy to build - transistor based motorcycle alarm. It`s designed to work at 12-volts. But - if you change the relay for one with a 6-volt coil - it`ll protect....
When starting with Arduino, one soon has much more Arduino boards then RS232 or even USB ports on the computer. So that, it seems more useful to put the signal level converter to an external adapter than directly on the Arduino board. Usually, one has (I....
I have few Kenwood TK-760G-1 transceivers (two-way radios) and they all were programmed to one channel and all other features were locked. In the internet and in local newsgroup I collected various software for Kenwood programming. All I needed is....
Electronic ballasts for dimming fluorescent lamps require a control interface for the user to set the desired lamp-brightness level. Existing interface circuits include a 1-to-10-Vdc interface, digitally-addressable lighting interface (DALI), triac-based....
The circuit was based on a single operational amplifier integrated circuit that is made to produce a modular preamplifier which functions in the Class A o....
This is the DC switching regultor Voltage 5V at current 3A. It is make for digital circuit. The important part of the circuit is LM2673, it is 3A Step-Down....
Universal motor control with built-in self-timer. Use this circuit only with motors having commutators. If heavy motor loads are anticipated, use a larger-rated C30B SCR in place of the GE-X1 for SCR2. To increase the time delay increase the capacitance of....
Circuit is based basically on quite well tested my simple microphone preamplifier. I have built one prototype of this circuit and it worked nicely. Soundblaster soundcard series (SB16, SB32, AWE32 and AWE64) have all a microphone input designed to be used....
Presented schematic shows how to build simple PIR motion detector sensor. PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and....
This page is a revised version of the original submission of an article entitled "Better Bachmann Sound For Under A Buck" published in the Feb. 1998 issue of Garden Railways Magazine. Editorial changes and additional artwork that might have been added by....
The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can use ignition transformer from automotive engine. A fly-back transformer is possibly usable too. The 4049 will drive the....
A DIY intervalometer for my Sony NEX 5N camera so that I could do time-lapse photography. This intervalometer should work with most Sony cameras: NEX, Alpha and other. To work intervalometer used infrared LED Serial LCD has 4 output: GND, VCC, SDA, SCL. SDA....
The circuit of automatic emergency light presented here has the following features: 1. When the mains supply (230V AC) is available, it charges a 12V battery up to 13. 5V and then the battery is disconnected from the charging section. 2. When the battery....
The crime prevention bell device that I produced about 20 years ago works still in the active service. It worked many times to make the thief not operate well and not go into it. The bell keeps ringing generally though the bell rings as for the crime....
This Resonance generators (oscillating sound generator) circuit, designed using CMOS integrated circuit number 4011(CMOS Quad 2-Input NAND Gate). Contains within 4 nand gate. To each oscillator circuit has a 2 circuit. This circuit provides a higher....
It is important yet to mention that the 74HC240 can drive directly an IRF510 FET transistor being able to give until 10W. Another application is using it to drive a balanced diode mixer, which needs a considerable power drive, easily supplied by a 74HC240....
BFP640 used for 1575 MHz Global Positioning Satellite (GPS) Applications BFP640 is investigated for use as an LNA for 1575 MHz GPs Design Goals: Gain = 16 dB min, Noise Figure -14. 8 dBm min Printed Circuit Board used is Infineon Part..
Did you know you can build your own home intercom? Read our instructions and find a circuit of a versatile home intercom system. The unit is able to communicate to as many as ten different locations or rooms discretely and incorporates a single change over....
This months project is based on the 4017 chip that we used in a project last month. If you haven`t had a chance to review the basics of the 4017 chip you may want to review the info presented in June`s project of the month. As you can see see we have changed....
Sometimes the need arises to construct a really simple oscillator. This could hardly be simpler than the circuit shown here, which uses just three compone....
The STK672-050 is a unipolar constant-current chopper- type externally-excited 4-phase stepping Motor Driver hybrid IC which uses MOSFET power devices. It has a microstep operation-supported 4-phase distributed con- troller built-in to realize a high torque,....
A relay is an electro-mechanical switch that opens and closes under the control of another electric circuit. When current flows through the coil of the relay, a magetic field is created that causes an armature to move, either making or breaking an electrical....
The electric fence control circuit is composed of the +6 V power supply circuit, high-voltage output circuit, trigger control circuit, alarm circuit and protection circuit, and it is shown in Figure 4-30. +6 V power supply circuit is composed of the power....
This is a very simple and easy to make IR receiver circuit. This infrared receiver circuit is using only few components and it is able to receive 38KHz carrier signal. The working of this circuit is simple when ever the IR LED receive any signal from 38KHz....
The SC41343 is designed as one kind of infrared, ultrasonic or RF remote control launch coding circuit. The internal circuit is composed of the sequence generator, control logic circuit?4-bit shift register?data extraction circuit and the latch circuit.....
Covering FM radio reception frequency, by adjusting the L value (La stretch or compression coil L) can easily change the transmission frequency to avoid the FM radio. Transmit signal coupled to the antenna through C4 to launch out...
Tone is made adjustable by using multiposition switch to change capacitors in oscillator circuit. Speed (rate of change in frequency) of siren is adjusted with R3. 4700-ohm resistor in series with R3 keeps siren op-erational when R3 is rotated to....
Included on this page are various small circuits I have created over time. Some are trivial, some are a bit more complex, but hopefully all are useful in a variety of projects. Most include both the schematics as well as the source ( KiCad ) files. This is a....
Applications 900 MHz ISM Band, Satellite TV LNB IF Amplifiers (950 - 2150 MHz), 1575 MHz GPs 2. 4 GHz ISM Band (802. 11 b/g WLAN, Cordless, etc. ), "SDARS" Satellite - based Radio (2. 33 and 2. 6 GHz), 5 - 6 GHz WLAN (802. 11a), 5 GHz Cordless Phones, etc.....
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....
HI, i Just wanted to understand this circuit better and discuss with people So here it is a ,crystal oscillator It uses a 3.5Mhz Crystal and....
The amateur radio call sign W9VES has been assigned to ”held by, as ham radio operators like to put it ”only two people, of whom I am the second. My maternal uncle, Phil Simmons, was the first W9VES, and I enjoy my amateur radio in celebration of him. By....
This Low Dropout Voltage (LDO) solar charge controller uses a simple differential amplifier and series P channel MOSFET linear regulator --their compatibil....
Controlling the speed of three phase ac motor is done by controlling the frequency of the power line supply,? since the motor is synchronized with the line...
All resistors are 5 or 10 percent tolerance, 1/4-watt all capacitors are 10 percent tolerance, rated 35 volts or higher. This circuit amplifies the output of a regular electret condenser microphone quite nicely. adjust sensitivity by turning R1..
The following circuit shows about Complete Solid state M-9 Power Amplifier Circuit Diagram. Features: DC servo make a loudspeaker protect circuit, ....
This is a design circuit for a simple 27MHz transmitter producing a carrier. The circuit can produces an unmodulated 27MHz signal and when picked up by a receiver. This is the figure of the circuit; The transmitter is a very simple crystal oscillator. The....
In the circuit diagram for the Joule Thief, the common point of the toroid is the connection at the top of the hand-wound ferrite toroid, in the upper right of the diagram. This goes to the positive end of the battery. The other two wires from the toroid go....
The distortion produced by a typical solid-state Class-B power amplifier is shown to consist of eight mechanisms, all of which may co- exist and whose distortion products overlap to give a complex result. Methods for isolating each mechanism for study, and....
National Semiconductor has been producing and designing ICs for use in switch-mode power supplies for many years. The application of these devices is norm....
LM3914 Dot Bar Display Driver LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 20 Led stereo Vu Metre Devresi PCB Circuit LM3914 10 leds stereo vumeter circuit diagram of Eagle PCB drawing of eagle ..
A one shot multivibrator generate a fixed width pulse at the output when the input is triggered. This fixed width output should be consistent, regardless the....
Here is the circuit schematic of a simple audio surveillance system in which the transmitter will pickup sound from one location and the receiver at other location will reproduce it. The receiver and transmitter are connected by only one set of wire. Here....
The Saver V5. 0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated....
Peripheral circuit is very simple, it is DAC schematic circuit diagram of the USB interface which adopts PCM2702 to make the picture, the Ausgang of circuit can be connected with the power amplifier directly, can drive earphone of more than 32 ohms too...
This project was inspired by a circuit that a friend of mine, Simon Field, over at Scitoys. com showed me. He had built a very simple transmitter circuit out of a 1Mhz "can" oscillator and a serial connector (see it here ) In his circuit he used a computer....
Can someone please help explain to me how this circuit works? I am pretty sure I understand how the voltage divider network works. I am pretty sure I....
By removing harmonics from a square wave, this circuit generates an accurate and adjustable sine-wave output....
Both transistors should be low noise types. In the original circuit, is used BC650C which is an ultra low noise device. These transistors are now hard to find but BC549C or BC109C are a good replacement. The circuit is self stabilizing and will set its....
This circuit features automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both normally-closed and normally-open contacts, and a 24-hour Personal Attack/Tamper zone. It is connected permanently to the 12-volt supply and its....
Typical solutions for vertical movement of probe of bed profiling devices (guide wheels, dumpers, brakes, backlash and vibration suppressors not shown). Figure 7. Pictorial description of a complete mechanism for vertical motion of a bed profiler; the....
The circuit of graphic equalizer, allocates ten adjusting potesometer , that each one from them affects in a predetermined area of frequencies, the central frequency of which abstains a octave (double), from the central frequencies of her neighbouring....
Visit eBid United Kingdom, the Online Marketplace without the Fees - buy and sell today....
This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around a standard reflective opto-sensor CNY70(IC1). In some disciplines, a line following robot or an....
This LED lamp was originally designed for use on a budget solar-charged 12V electrical system. It is bright enough for comfortable reading at night and features constant LED brightness with diminishing battery voltage. The circuit uses six high-brightness....
The 555 Astable generates a clock for this circuit, an oscillator giving a square wave output at pin 3 which is counted by 4017 to give a running lights effect. The decade counter-divider CD4017 has 10 outputs, for every low to high transition at the clock....
Install the red LED at D2. Align the flat side of the LED with the PCB outline. Install a jumper wire at R4 and install a 220uF electrolytic cap at C8 with the negative side to ground. Connect pin2 of J4 to the AGC input on the 612 HF mixer...
This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful....
As the name implies,emergency light is a source of light available during an emergency.It is an automatic system in which a rechargeable battery operated l....
The following circuit is a cheap completely transistorised inverter circuit ideal for driving medium loads with the order of 40 to 60 watts working with battery of 12V, 15 Ah or larger power capacity. Transistors T1 and T2 (BC548) make a 50Hz multivibrator.....
The MLX90224 series are dual Hall effect Latches It includes two Hall effect latch functions of which typical thresholds are +/- 2. 0 mT. In each latch, the magnetic flux detection is performed by a switched silicon Hall plate. The BOP and BRP are....
This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only special` component in the circuit is a window discriminator (a fancy version of a window comparator). Resistors R1 and....
Low Cost Water Pump Controller Circuit. The sensors applied to the circuit could be any two conducting probes, preferably resistant to electrolytic corrosion. For example, in the easiest case, a appropriately sealed audio jack could be utilized to operate as....
Chipmunk BASIC has lots off useful functions. So I wrote a small BASIC file to read the serial port and then plot the value on screen (Avaliable upon request FREE). The desktop 386SX PC has a 1. 44 FD and a 40M HD, a VGA with 256k of VRAM. BIOS was configure....
A very simple split power supply circuit project can be designed using this schematic diagram which is based on a LM380 audio power IC. The regulation of the output voltage depends of the upon circuit feeding the LM380. The power dissipation is around 1 watt....
National Instruments Multisim now has microcontroller unit co-simulation capabilities, allowing you to include a microcontroller, programmed in assembly or C code, within your SPICE modeled circuit. The MCU functionality in Multisim enables students,....
The idea for this crystal tester circuit sprung out of the need of testing a large number of oscillator crystals lying unused in a big hobby box. testing the crystals one by one without the appropriate device would have been very slow and a time consuming....
Hello, this is my first post here. I built several versions of JFET static charge detectors and I`m seeing some differences I can`t explain so I`m....
The water resource is being turned into a valuable rare resource. So, popularizing the water-saving irrigation has already become countries all over the world in order to relieve the water resource crisis and realize the inevitable choice of agricultural....
