New Circuits Page 165
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This UHF transmitter is designed for low power applications as remote for garage doors and operating systems, wireless alarm. This UHF FM transmitter with....
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It is sometimes necessary for an RC (remote control) model to contain some kind of switching functionality. Some things that come to mind are lights on a model boat, or the folding away of the undercarriage of an aeroplane, etc. A standard solution employs a....
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According to the datasheet, they`ll switch about 160 kW at up to 10 kV (7. 2 kV typical). Sadly this is not enough for the quarter shrinker, but I think I see a miniature ring flipper in my future I`m very excited to be speaking at Ada`s Technical Books on....
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A simple electronic circuit project is discussed here that may be built by any school student for displaying in a school fair science exhibition. The proposed circuit is a high gain opamp amplifier which detects slightest of RF disturbance that might be....
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Several years ago a colleague suggested that I should be using PICs for my hobby, which then was amateur television. I spent many hours developing and experimenting with video mixers, faders and effects (FX) units, and all this was done sing analogue and....
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This chapter contains the description of a simple development board for the study of the 8051 family of microcontrollers Unlike the development boards dedicated to the HC11 and AVR families, presented in the previous chapters, this project allows the user to....
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I make a real-size printout of the PCB in order to verify dimensions of all parts against it. Should a part be too big or small to match its PCB pads, I can adjust PCB layout or try to findia compatible part before the hard work starts. Once all parts are....
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A half bridge setup with strain gages and a INA126 to amplify the voltage. I can read the voltage fine when the lever is bent one way, but when beding the lever in the opposite direction I don`t get any reading. I`m guessing it`s because the voltage is....
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The Universal Development Board has external 5v Relay interfacing, indicated as in Figure. ULN2803 is used as a driver for FPGA I/O lines, drivers output connected to relay modules. PTB connector provided for external power supply if needed. Signal LEDs for....
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A circuit is described that transmits temperature data over an IR link. This allows isolation of the temperature sensor....
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Complete GPS solution using MAXIM CMOS RF front-end receiver MAX2742 and SONY GPS baseband CXD2932 is presented....
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This 555 timer based circuit is a kind of voltmeter, also an analog to digital converter, that converts the analog input voltage to digital output pulses ..
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Small telephone bug. Listen telephone line on your FM receiver. It is self powered. Small part count. Circuit diagram, schematics, electronics project....
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The loads (2 or more solenoids in parallel) share a 12V supply and are individually switched to ground through the car`s ECU. I need to detect when any one of the circuits close (only one closes at any one time), using a single PIC digital in (or comparator....
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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Dynamic flip-flops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to....
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this circuit serves as a motor controller circuit to easily controlling or varying the RPM & Phase control of a AC motor. source: directly 220VAC Load: approx. 1hp AC motor (600w-1kw) CIRCUIT DIAGRAM: COMPONENT PARTLIST: C1 = 2G ....
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A simple way to produce your own speaker transformer by winding turns on a piece of ferrite rod. The primary winding is made by winding 300 turns of 0. 01mm wire (this is very fine wire) over the secondary and ending with a loop of wire we call the centre....
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Many a times one needs an ex- tra telephone ringer in an ad- joining room to know if there is an incoming call. For example, if the telephone is installed in the drawing room you may need an extra ringer in the bedroom. All that needs to be done is to....
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To this small FM transmitter to change the mic for an audio jack so I can plug it into my mp3 player to listen to songs on my car audio. I looked at some of the transmitters on this site, but I think I`m going to go with this one, as I find it simple, and....
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The following is an example for a very simple and high quality JFET preamp. You can use this to amplify a very low signal sources. FET transistors are usually not used independently in preamplifiers. In most of the cases they are paired with bipolar....
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Learn how to interface LEDs with 8051 Microcontroller. Download free source code and circuit diagram of P89V51RD2 Microcontroller ..
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In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a....
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In the project LED Touch Sensing by Jeff Han, I saw a magic happen on a LED matrix. That LED matrix not only lighted but also sensed the touch of fingers. At first, I thought there should be some secret behind and the LED matrix he used must be a special....
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This is the circuit diagram of a ding dong sound generator based on two NE555 timer ICs. The circuit is designed to toggle between two adjustable frequencies to produce the ding dong sound. The first NE555 (IC1) is wires as an astable multivibrator operating....
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The design of the circuit is aimed to create a preamplifier for television systems that would operate in the UHF frequency range of 450 MHz to 800 MHz and....
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A very simple battery charger circuit having reverse polarity indication is shown here. The circuit is based on IC L200. L200 is a five pin variable voltage voltage regulator IC. The charging circuit can be fed by the DC voltage from a bridge rectifier or....
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his simple charger uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor....
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Usually when the car door is closed, the dome light just goes OFF. With this circuit, you can have our dome light fade slowly in brightness and finally go OFF. Electronic Transformer Dims halogen Lamp : 05/11/00 EDN-Design Ideas / (several circuits in PDF)....
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The circuit work theory This infrared automatic hand washing device circuit is composed of power supply, infrared transmitting circuit, infrared receiving circuit and control circuit, the circuit is shown in the figure 9-121. The power supply circuit is made....
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* This meter looked like it works well: YouTube - IndikG tor vybuzenG s LM3915 but the schematic is quite different. Google Translate If I followed that schematic, do you think everything would still work You should use a peak detector circuit at the input....
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Connecting the CPLD board to a ChipKit board, to be able to read the measured frequency...
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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....
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The LT ®4430 drives the opto-coupler that crosses the galvanic barrier in an isolated power supply. The IC contains a precision-trimmed reference, a high bandwidth error amplifier, an inverting gain of 6 stage to drive the optocoupler and unique overshoot....
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I will be using the bike eventually for quite long trips, off roading at night and dual sport riding, so the bike needs good headlamps, indicators and an accessory socket. To this end, I fitted the bike with a 12v 10AH battery, on two custom lugs welded to....
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The MP3 files (up 65, 536) are stored in a micro SDcard. This embedded MP3 module is an universal and compact circuit (37 mm x 27 mm) for playing MP3 audio files. The MP3 module can be used in embedded systems. Usually, the audio output from a laptop`s....
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This i-TRIXX circuit can prevent a whole lot of trouble for those of you who go on holiday in a caravan. It would be a significant damper on your holiday spirit when you are ready to leave the camping and discover that you have used your battery too much and....
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The LM35 series are precision integrated-circuit temperature sensor, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage over linear temperature sensorscalibrated in ° Kelvin, as the user is....
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A lot of electronic circuits in the domain of audio amplifiers are already been published here. This circuit is a little different because it is a four channel amplifier. Each channel of this amplifier can deliver an output of 15Watts into a 4 ohm speaker.....
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This is BTL(bridged tied load) mono amplifier with DC volume Control circuit. This circuit uses TDA7052A/AT that is suitable not only for monitors and TV but also battery fed portable radios and recorders. The difference between conventional DC volume....
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This circuit should be the easiest to tune as well (Reason: when the pulse is at 6V, all transistors should be open switch, so logically, there will never be battery shorts). The pulse voltage source V5 can be replaced by a 555 astable circuit. V6 can be....
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The material in this section shows how we built the Twist-Shift system for VHF using commonly available (and cheap) surplus land mobile VHF transceivers modified to operate on the 2-meter ham band. The radios we used were the 100-watt Motorola SyntorX model.....
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This is the circuit diagram of DC to DC converter based LM2596, the circuit has a single input supply and multiple voltage outputs. The circuit has an input voltage range of 15V to 40V. It has 5 outputs: 3. 3V at 1. 5A; +12V and ’12V at 50 mA each; and +5V....
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I hope that this crystal set is well received by all of you. My #62 radio combines the features of some of my earlier radios. It combines the one piece approach of my #48 set and the dual detector of one of my recent sets. The coil arrangement is a dual....
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AutoZone Repair Guide for your Engine Performance & Emission Controls Components & Systems Camshaft Position Sensor....
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The CXA1600M CXA1600P is an 8-pin single-chip bipolar IC for AM Radios This IC includes all functions from the front-end to the power Amplifier The CXA1600M CXA1600P doesnt require any external Filter making external ceramic Filter attachment unnecessary. By....
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If you have an application in which a MOSFET is already used to switch a load, it is relatively easy to add short-circuit or overload protection. Here we make use of the internal resistance RDS(ON), which produces a voltage drop that depends on the amount of....
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In order to obtain a good audio reproduction at different listening levels, a different tone-controls setting should be necessary to suit the well known behaviour of the human ear. In fact, the human ear sensitivity varies in a non-linear manner through the....
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This is a gadget that will estimate the amount of water left in the water tank of a caravan or camping unit....
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The first positive pulse from a classic 555-based oscillator is always 1. 6 times longer than the following pulses. The difference is caused by the fact that only during the first cycle C2 starts charging up from 0 V. This is generally not a problem, but....
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Today, almost all computers contain logic blocks for implementing a USB port. A USB port, in practice, is capable of delivering more than 100 mA of continuous current at 5V to the peripherals that are connected to the bus. So a USB port can be used, without....
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This small InfraRed Remote Control Tester circuit is used for checking the operation of an infrared remote control unit. The circuit is based on the idea of connecting a piezo buzzer directly to an IR receiver IC. The TSOP1738 integrated IR receiver accepts,....
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Two circuits for laser transmitters. The first uses a simple laser pointer module. Any of the normal 3 or 5mW devices will function well. Imports from the USA or Hong Kong are frequently a higher power than the UK approved units. The modules normally contain....
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There is a great deal of old amateur gear which many amateurs have decided to restore and bring back to life. While much of the early amateur transceivers work just fine they usually lack a digital readout and must rely on analog dials for tuning. The....
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This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly....
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The brake lights of the automobile trigger this circuit on and off. This save the annoyance of the alarm when it is not needed. This is an older circuit which was published in Popular Electronics Magazine, but still a good circuit today...
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Most of the V/F converters in this chapter produce pulse or square-wave outputs. Many applications (such as audio, filter, or automatic-equipment testing) require a sine-wave output, such as is produced by this circuit. The sine waves from this circuit span....
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Electrical lines which include lighting circuits begin from the main distribution panel of the installation and each line contains three conductors: phase, neutral and ground. All three conductors reach to the terminal point of each luminaire and if it has a....
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The figure shows the schematic for a versatile logic probe. The zener diode clamps the input signal just above the TTL inverter`s 2.2-V trigger voltage. Zener diode D1 can be left out if the probe is going to be used only on TTL circuits. The logic probe is....
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3-wire door locks can be either positive (diagram below), or negative. There is either a constant ground or positive wire that makes contact with either the lock or unlock wire when the switch is pushed. The idea here is to add relays that will make the....
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The schematic shown here is a circuit of plant watering watcher or dry soil detector. The plants located in your home or office wants more care as compare to the plants outside. We often forget to water the plants in our home and offices due to load of work....
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Accurate 50Hz Oscillator Circuit Using 555 And 7490 This circuit is a getting a 50Hz pulse. It comprises a 555 timer and two 7490 divide-by-ten....
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Colour Temperature is a term used to describe the colour tonality or shade of light. As anyone who has tried to buy a tin of white paint knows well, white is a very subjective colour available in a large number of hues. We hope this guide will help you....
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Compact circuit, Can be wired in parallel to existing switches This device allows one or more lamps to illuminate at sunset and turn off at dawn.Q1 and Q2....
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To begin, connect a single NAND gate to two input switches and one LED, as shown. At first, the use of an 8-position switch and a 10-segment LED bargraph may seem excessive, since only two switches and one LED are needed to show the operation of a single....
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This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment..
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The ability to reduce power losses is most important Describing here a new ultra-high-performance topology expected to be the foundation for next-generation dc-dc power supplies in high....
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A radio controlled electronic flash is a useful item in any photographer s kit. Professionals use them all the time. For example, a wedding photographer w....
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How to generate the signal for contolling a standard (RC) servo motor using a PIC microcontroller....
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CCFLs are often used to backlight the LCD displays of portable computers Such lamps require a high-voltage sine-wave drive. This circuit provides such drive and permits lamp intensity to be varied continuously and smoothly from zero to full intensity. Notice....
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A blog about new developments in 3D printing, RepRap and Open Hardware A blog about new developments in 3D printing, RepRap and Open Hardware...
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i need to control it with a ordinary pic. could someone please explain me how do i do it. im using it to control lego light sensor ..
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The ICL7665S Super CMOS Micropower Over/Under Voltage Detector contains two low power, individually programmable Voltage detectors on a single CMOS chip. Requiring typically 3A for operation, the device is intended for battery-operated systems and....
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This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment.....
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This is a design circuit diagram of a versatile FM transmitter. This circuit doesn`t have a coil. The circuit is simple and easy to assemble. This circuit is work based on gate logic concept. This is the figure of the circuit. The gate N1 acts as a buffer....
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The schematic diagram come from circuit: Car Lamp Charger power supply. Go to that page to read the explanation about above power supply related circuit diagram. Scheme of the Car lamp charger is shown in above. A distinctive feature of the scheme is that....
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This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the....
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GTP USB PIC PROGRAMMER (Open Source) This work includes, GTP USB (not plus or lite) . The schematic, photos and PCB have been developed by PICMASTERS based....
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Build a sine wave generator. I use this schematic:. The op-amp I have used is the TL082 and the power supply of 9V. However, I do get a nasty sound, indicating that I am not getting a sine wave but rather a distorted waveform. Any idea why this is happening....
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A short note describing how to replace crystal and ceramic resonator clock circuits with silicon oscillators and highlighting some of the technical advantages offered by these devices in microcontroller clock applications....
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Voltage Controlled Shape on each Oscillator, Calibrated 1V/Octave Keyboard Input, External Gate Input socket, Portamento/Glide, Patchable Voltage Inverter, Extra Input Channels, Better Panel Components, Power Supply Replacement, Mains Connectors....
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Generate sound or output analog voltages with an Arduino. This Instructable will show you how to set up a really basic digital to analog converter so....
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This is the circuit diagram of USB powered computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chipbased design, low-voltage electrical power supply, compatibility with USB power from computer, simple heat-sinking,....
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On the poles, the plane of the pendulum swing would make one rotation each day. On the equator, however, the plane will not rotate at all. This begs the question of why the plane rotates. Due to rotating reference frames and the Coriolis force, the pendulum....