New Circuits Page 56
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A very simple electronic key code lock circuit that require few external components can be constructed using this schematic diagram. This electronic key code lock circuit is based on a common 555 timer circuit and some other common components. This low cost....
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This is a simple visual indication of the audio level signals, adaptive to various user needs. Can be adapted to different input levels, adjustable by trimmer TR1 (state) - TR2 (Gain), then rectified by diodes D1-D2 (standard negative mark-recovery periods)....
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This is an a simple Tone Control Circuit using TDA1524A. Is the heart pillar in the work that is IC chip diagram of Philip. You can use a tone control or a portion of the lower portion of fines sound, treble and balance to get all setly can be extended by a....
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It`s supposed to reduce the max. voltage between the GPIO input pin and the current source to 3. 3V, since 5V * (10K/(10K+5K) = 3. 3V. The thing is - 3. 3V is the voltage over the 10K resistor and 1. 7V is the voltage over the 5K one. As long as the current....
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Most universal radio receivers have a very wide bandwidth that is not particulary for radio amateurs. The better models with narrower bandwith are almost a....
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FM radio receiver circuit is an FM receiver made by IC TDA7000. The circuit uses IC TDA7000 FM receiver can be supplied with a DC voltage of 2 volts DC to 12 volts DC. FM radio receiver circuit includes a series of simple because it uses the TDA7000 IC. IC....
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In some industries, to control the some equipments they are use computer-controlled 4-20mA current loop. This current loop is used transmit a signal over a....
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Dimmer, from the word n. dim, v. to dim . Simple device to make light of incandescence lamps lower. Also, used to slow down colector motors. All this started because Lithuanian internet is full of old soviet circuits with archaic components. Meanwhile other....
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Although the voltage across the two pins of our microphone will fluctuate based on the input sound, we would like to amplify this so that the Arduino can actually read the signal. This can be a bit of a complex circuit to think about at first to we will....
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It is often required to switch electrical appliances from a distance without being a direct line of sight between the transmitter and receiver. As you may....
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Automatic Street light system is very common nowadays as it provides intelligent street lighting mechanism. It provides light automatically during night. These energy saving street lights make uses of incandescent lamps instead of LEDs. So here we will teach....
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I need an AC line 220V light display or main voltage monitor. Because the home ‘s electric of his brother a very often problem. Below a figure is the 230V AC v....
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This 1-kHz linear-scale analog frequency meter circuit uses the 555 as a pulse counter. Frequency is read on M1, (or 1 mA meter) which can be calibrated to read 0 to 1 kHz....
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The LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts. The device also has built in current limiting and thermal shutdown which makes it essentially blow-out proof....
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This 1. 3V power supply can be used as replacement for the 1. 3V Mercury Cell in any circuit. When the input 5V is given to the circuit, the voltage drop across zener diode D1 will be around 2V. The diode D2 will drop a 0. 7 V from the 2V volt and the....
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Voltage to be sampled is applied to the input which is one end of R2 (100K linear taper potentiometer). The other end of R2 is grounded and thus the level of signal applied to buffering level shifter U1-A and associated components is controlled by R2.....
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Use a remote control with your computer, view infrared signals on a logic analyzer, or capture and replay remote control buttons. USB Infrared Toy v2 has an improved IR transmitter and several new features. There`s lots of interesting infrared projects on....
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Using this schematic I doubled the range of my IR LED, the power drawn in the circuit is now 37mA. My former circuit, without using a NPN transistor drew 20mA (JeeNode max per digital pin). So that`s almost twice the power. You could increase this even....
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Here is a new audio power amplifier schematic built around TIP darlington pair transistors. You can use this circuit for home audio power amplifiers and car audio amplifiers. The TIP142 and TIP147 darlington pair transistors forms a push pull high power....
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This video demonstrates how to bring up multiple instances of QsoNet`s Dahdidah Cw Software Keyer using FABULATECH`s VIRTUAL SERIAL PORT SPLITTER. Four separa....
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The Spartan-3an board has eight LED Connected with FPGA I/O pins (details tabulated below). The cathode of each LED connects to ground via a 330 © resistor. To light an individual LED, drive the associated FPGA control signal to High...
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This is a simple circuit of low power regulator reference. This circuit can produces stable voltage reference. The voltage reference that is produced by this....
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Article explains how to layout a standard MAX16922 automotive PMIC (power-management IC) to maximize performance and minimize emissions....
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There is great sensitivity to operating costs when dealing with high-powered commercial lighting. In these applications, there is increased emphasis on energy efficiency and ac line power factor because these parameters impact operating expenses. The....
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The JFET Pierce oscillator is stable and simple. It can be the clock of a microprocessor, a digital timepiece or a calculator. With a probe at the output, it can be used as a precise injection oscillator for troubleshooting. Attach a small length of wire at....
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Build a circuit that will flash 5 pairs of LEDs at variable rates. To do this I designed a circuit using 5 NE555 timers. To control the variable flash rate I want to use trim pots. I am having a hard time figuring out where to lay out the trim pot and what....
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A circuit diagram and example code to implement and use the DS18B20 temperature sensor in PICAXE both in rounded and full12bit resolution....
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The MOC303XM and MOC304XM devices consist of a AlGaAs infrared emitting diode optically coupled to a monolithic silicon detector performing the function of a zero voltage crossing bilateral triac driver. MOC3041. They are designed for use with a triac in the....
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A small electronic switch that connects a battery to the equipment for a certain amount of time when a push-button is momentarily pressed. And we have also taken the ambient light level into account; when it is dark you won`t be able to read the display so....
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Alarm system designs often require circuitry that can detect whether a phone line is active or broken. With this type of design, the primary difficulty is drawing less than 5 µA from the phone line over a line-voltage range of 24 to 58 V as the standard....
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When there is no smoke the light from the bulb will be directly falling on the LDR. The LDR resistance will be low and so the voltage across it (below. 6V). The transistor will be OFF and nothing happens. When there is sufficient smoke to mask the light from....
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This be simple check pressure level circuit, with integrated number circuit TL431. When use power supply 5Volt in digital circuit. The general feeding signal....
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This circuit is usable as a Night Lamp when a wall mains socket is not available to plug-in an ever running small neon lamp device. In order to ensure minimum battery consumption, one 1.5V cell is used and simple voltage doublers drives a pulsating....
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Here the simple and low cost FM transmitter circuit. The frequency range of this FM transmitter should be about 89MHz 109MHz. Output power is about 9mW at 9V. R1, R6_12K R2, R4_100K R3_22K R5_1K R7_100R Q1_BC338 Q2_BC548B Microphone JinIn ECM-60P B1....
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The following circuit shows about ?DTMF Remote Domestic System Control Circuit Diagram. Features: DTMF signals can be transmitted over a radio to ...
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This circuit uses a single chip, IC TL074 for achieving a 5-band graphic equalizer for use in Hi-fi audio systems. The 5-band graphic equalizer is true for radio-cassette player, and car stereos. This unit features: low distortion and low noise, wide range....
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The description of this circuit is rather simple. The RTS line of the serial port gives power to the voltage regulator which fixes it to 5 stable volts. A diode is there to protect the serial port from inverse current. The capacitor helps to keep a stable....
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AN6591FJM is a single chip IC optimum for PHS, and a quadrature Modulator reception IF and PLL are inte- grated in it. As this IC is housed in a QFN package (quad flat non- leaded PKG), realization of compact equipment through this super-small package is....
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Since high frequency voltage-controlled oscillators, or VCOs, are not easy to construct, Maxim ( has produced an integrated 1. 2GHz oscillator, the MAX2754. The center frequency is set using the TUNE input, and a linear modulation input allows the frequency....
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Power pulse circuit by LM350 and NE555 . This circuit can use to drive lamp,power LED,DC motor etc. Adjust R5 for output amplitude.Adjust R1 for output power .The LM350 is adjustable 3-terminal...
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When it is necessary to send a digital signal between two electrically isolated circuits you would normally choose an optoisolator or some form of transformer coupling. Neither of these solutions is ideal; optocouplers run out of steam beyond about 10 MHz....
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This again the one circuit that can is dc regulator the many voltage get simplely. Or Simple step down dc converter multi voltage. By have R1 be formed fix the....
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This is my first project using an AVR microcontroller and really the first embedded systems project I`ve done since college. I had two options for programming languages C and assembly. I chose assembly because I was familiar (at least with the 8051) and....
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How the processor produces `3` as the output. I realise that this question may be difficult to answer in simple terms. If it is, then a link would help, perhaps to a book...
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In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit....
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We are using LM3886 which is the revised version of its brother LM3875.Briefly features of LM3886 are; Maximum Output Power: 68W RMS 108W Peak THD: %0.03 at 60W S....
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This week was spent completing a number of different objectives. Firstly, the software was downloaded to design the schematic for the circuit to be translated onto a PCB. Much of the week was spent doing tutorials and learning the user interface to make a....
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Here is an automatic water tank controller that controls the operation of a water pump through a 12V 10amp relay. When ever the water level of the tank short circuits the points A and B in the circuit diagram, the pump get turned off automatically. This home....
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The electret microphone has a current of 200uA which changes by +- 3 uA depending on sound waves. This sets the voltage across R1 to 2V and the voltage across the mic to 4 volts. As the sound hits the mic the current through R1 increases slightly reducing....
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The following circuit shows about Boost Converter Circuit Diagram. This Circuit Based On The 555 IC. Featrures: only requires an `of the shelf` ....
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The LM324N is one member of the LM324 family,this family consists of four independent, high gain,internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of....
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Presented in this letter is a very low-power monolithic 1.9GHz silicon LNA which draws a total current of 1.75mA including bias circuit....
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Free-energy" or "G-solar energy" as solar infrared radiation energy stored in the gravitational field. Alternative terms: "Aether heat", "2nd-material layer Heat" In the link below, professor KonstantinMeyldescribes in detail simple experimental setting of....
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FM transmissions can be received within a range of 40 km. If you are in fringe areas, you may get a very weak signal. FM DXing refers to hearing distant stations (1500 km or more) on the FM band (88-108 MHz). The term DX` is borrowed from amateur radio....
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This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today....
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This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and RX-2B from Silan Semiconductors. TX-2B / RX-2B is a remote encoder decoder pair that can be used for remote control applications. TX-2B / RX-2B has five channels,....
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The schematic for the crystal bandpass filter/amplifier board appears below (left) withimages of the assembled and boxed unit appearing below center andright. The signal frequency bandpass filter isconstructed over a ground plane and housed in its own....
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An old Nokia phone charger with 5. 6 V output, so I tried to adjust it to 12 V. By changing the Zener diode though I manged to do that, but I can`t understand its circuit (I replaced the 9v1 with 16v Zener). I would really appreciate any help to understand....
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Plug the diode VD under test into sockets X1 and X2. Stabilized power supply adds reverse breakdown voltage to VD and the stabilized voltage value Uz can be read from voltage meter V, and the stable-working current value can be read from the milliammeter mA....
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This circuit requires a regulated 10V-DC front end capable of supplying 2 Amps. Begins the charge period at 240mA and at full charge switches automatically to a float condition (trickle charge) of 12mA. The capacitors should be the ceramic 50V (or greater)....
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The 8051 became widely popular after Intel allowed other manufacturers to make and market any flavors of the 8051 they please with the condition that they remain code-compatible with the 8051...
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This circuit is used IC number NE555 set up to stable multi vibrator. It produces a frequency rectangular patch of about 100 Hz. Out to pin 3 through C3 and C4. Before the rectifier power section. Both positive and negative DC 2 series. Positive power supply....
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Building your own Zapper. 1 Compositor 1 micro farad, C2, I like the un-polarized because it allows you not to worry about positive an negative sides. If you do get one with a longer leg that`s the positive, see schematic for proper placement. 1 resistor for....
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LH0024 IC small signal IC designed for general purpose switching and amplification due to its low voltage, low voltage and three different win the election 1N4148 silicon small signal diode planar epitaxial used for fast switching applications with a reverse....
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It is a wireless doorbell with a cost of about $10. 00. So, we have to change our attitude to building projects and use items such as this to learn how things work and modify them to suit our own requirements. This doorbell uses quality components. It`s not....
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An HD44780 Character LCD is a liquid crystal display (LCD) display device designed for interfacing with embedded systems. These screens come in a variety of configurations including 8x1, which is one row of eight characters, 16x2, and 20x4. The most commonly....
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This is a relay driver that is based on a PIC16F84A microcontroller. The board includes four relays so this lets us to control four distinct ....
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This simple circuit indicates the amount of power that goes to a loudspeaker. The dual-color LED shows green at an applied power level of about 1 watt. At 1. 5 watts it glows orange and above 3 watts it is bright red. The circuit is connected in parallel....
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This is the story of the Fredbox, a rig that first saw the light of day in 1974 in Cambridge. In the last few months it has been restored to full working order to enjoy the renewed interest in AM operation on 2m in the UK. For several years I`d worked local....
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This low cost bass treble circuit consists of some capacitors, resistors, and two T/C pot for BASS and TREBLE control. this circuit can be made without even a veroboard. You just solder components as this circuit network is not so complex. It has only....
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This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete iso....
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. a 32. 768 KHz square wave from a common watch crystal. The output can be fed to a 15 stage binary counter to obtain a 1 second....
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The main part of this circuit is the LM386 amplifier chip. It also uses a transistor input to buffer the input signal and provide extra gain for the LM386. The little unit has helped me out on numerous occasions when trouble shooting any amplifier circuit....
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As I`m working from a single power supply and I`m trying to keep the design small, I`ve been using the LM386n-1 IC. Also, how would you suggest I control the frequency, which component value should be changed to achieve this - I`ve tried messing with all the....
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This LCD terminal provide two modes of operation by selecting jumper J1. When J1 is open the terminal operate as a normal ascii display terminal, when J1 is closed the terminal displays the input serial data in hexadecimal format. This mode is useful for....
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The following post illustrates a simple light toggled/operated remote control circuit, which can be activated by an ordinary flashlight or more effectively through a laser beam unit (key chain type). The LDR is connected across the base of thetransistor and....
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The battery voltage has to pass through R1 before reaching the load at the output and therefore the current passing through it is proportionately transformed into voltage across it. When the battery voltage falls beyond a certain low voltage threshold, the....
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The circuit shows a simple triangle and square wave generator with a common dual operational amplifier LM1558 to produce very low frequencies around 10 kHz. The time interval for one half cycle is about R * C and outs of supply of 10 mA. The amplitude of the....
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Using a K-12 tube amp with a NAD C542 CD player, there is no need for a buffer or line level preamplifier. The K-12 is a very polite and sweet amp with all the warmth of it`s "hot bottle" heritage. However, when I compare the K-12 with my monoblock chip amps....
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The High Power Amplifier has great advantages are 5000W ultra-light, high-power audio amplifier, without switching-mode power supply. This ambit is of an 2 x 2, 500W RMS Stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof....
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The output assign modules uses a 16V8 GAL for address decoding and enable signal generation. Figure 44 shows the pin assignments for the GAL used in the output assign module. The VHDL code used to generate the GALs is included in the appendices, on page The....
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I have an almost mint condition Fisher 800b hi-fi amplifier that I want to convert into a mic pre. All of the power supply SS diodes need to be replaced with modern, low noise parts. All electrolytic caps. need replacement. The signal caps. may still be....
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The other thing I thought of is using a phase shift oscillator followed by an inverter to turn the sine into a square wave, but it semms a rather crude solution. I`m also looking for the schematics to a frequencydivider. I know you can use a flip flop to....
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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....
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This Project Automatic Room Light Controller with Bidirectional Visitor Counter using Microcontroller is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately.....
A very simple electronic key code lock circuit that require few external components can be constructed using this schematic diagram. This electronic key code lock circuit is based on a common 555 timer circuit and some other common components. This low cost....
This is a simple visual indication of the audio level signals, adaptive to various user needs. Can be adapted to different input levels, adjustable by trimmer TR1 (state) - TR2 (Gain), then rectified by diodes D1-D2 (standard negative mark-recovery periods)....
This is an a simple Tone Control Circuit using TDA1524A. Is the heart pillar in the work that is IC chip diagram of Philip. You can use a tone control or a portion of the lower portion of fines sound, treble and balance to get all setly can be extended by a....
It`s supposed to reduce the max. voltage between the GPIO input pin and the current source to 3. 3V, since 5V * (10K/(10K+5K) = 3. 3V. The thing is - 3. 3V is the voltage over the 10K resistor and 1. 7V is the voltage over the 5K one. As long as the current....
Most universal radio receivers have a very wide bandwidth that is not particulary for radio amateurs. The better models with narrower bandwith are almost a....
FM radio receiver circuit is an FM receiver made by IC TDA7000. The circuit uses IC TDA7000 FM receiver can be supplied with a DC voltage of 2 volts DC to 12 volts DC. FM radio receiver circuit includes a series of simple because it uses the TDA7000 IC. IC....
In some industries, to control the some equipments they are use computer-controlled 4-20mA current loop. This current loop is used transmit a signal over a....
Dimmer, from the word n. dim, v. to dim . Simple device to make light of incandescence lamps lower. Also, used to slow down colector motors. All this started because Lithuanian internet is full of old soviet circuits with archaic components. Meanwhile other....
Although the voltage across the two pins of our microphone will fluctuate based on the input sound, we would like to amplify this so that the Arduino can actually read the signal. This can be a bit of a complex circuit to think about at first to we will....
It is often required to switch electrical appliances from a distance without being a direct line of sight between the transmitter and receiver. As you may....
Automatic Street light system is very common nowadays as it provides intelligent street lighting mechanism. It provides light automatically during night. These energy saving street lights make uses of incandescent lamps instead of LEDs. So here we will teach....
I need an AC line 220V light display or main voltage monitor. Because the home ‘s electric of his brother a very often problem. Below a figure is the 230V AC v....
This 1-kHz linear-scale analog frequency meter circuit uses the 555 as a pulse counter. Frequency is read on M1, (or 1 mA meter) which can be calibrated to read 0 to 1 kHz....
The LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts. The device also has built in current limiting and thermal shutdown which makes it essentially blow-out proof....
This 1. 3V power supply can be used as replacement for the 1. 3V Mercury Cell in any circuit. When the input 5V is given to the circuit, the voltage drop across zener diode D1 will be around 2V. The diode D2 will drop a 0. 7 V from the 2V volt and the....
Voltage to be sampled is applied to the input which is one end of R2 (100K linear taper potentiometer). The other end of R2 is grounded and thus the level of signal applied to buffering level shifter U1-A and associated components is controlled by R2.....
Use a remote control with your computer, view infrared signals on a logic analyzer, or capture and replay remote control buttons. USB Infrared Toy v2 has an improved IR transmitter and several new features. There`s lots of interesting infrared projects on....
Using this schematic I doubled the range of my IR LED, the power drawn in the circuit is now 37mA. My former circuit, without using a NPN transistor drew 20mA (JeeNode max per digital pin). So that`s almost twice the power. You could increase this even....
Here is a new audio power amplifier schematic built around TIP darlington pair transistors. You can use this circuit for home audio power amplifiers and car audio amplifiers. The TIP142 and TIP147 darlington pair transistors forms a push pull high power....
This video demonstrates how to bring up multiple instances of QsoNet`s Dahdidah Cw Software Keyer using FABULATECH`s VIRTUAL SERIAL PORT SPLITTER. Four separa....
The Spartan-3an board has eight LED Connected with FPGA I/O pins (details tabulated below). The cathode of each LED connects to ground via a 330 © resistor. To light an individual LED, drive the associated FPGA control signal to High...
This is a simple circuit of low power regulator reference. This circuit can produces stable voltage reference. The voltage reference that is produced by this....
Article explains how to layout a standard MAX16922 automotive PMIC (power-management IC) to maximize performance and minimize emissions....
There is great sensitivity to operating costs when dealing with high-powered commercial lighting. In these applications, there is increased emphasis on energy efficiency and ac line power factor because these parameters impact operating expenses. The....
The JFET Pierce oscillator is stable and simple. It can be the clock of a microprocessor, a digital timepiece or a calculator. With a probe at the output, it can be used as a precise injection oscillator for troubleshooting. Attach a small length of wire at....
Build a circuit that will flash 5 pairs of LEDs at variable rates. To do this I designed a circuit using 5 NE555 timers. To control the variable flash rate I want to use trim pots. I am having a hard time figuring out where to lay out the trim pot and what....
A circuit diagram and example code to implement and use the DS18B20 temperature sensor in PICAXE both in rounded and full12bit resolution....
The MOC303XM and MOC304XM devices consist of a AlGaAs infrared emitting diode optically coupled to a monolithic silicon detector performing the function of a zero voltage crossing bilateral triac driver. MOC3041. They are designed for use with a triac in the....
A small electronic switch that connects a battery to the equipment for a certain amount of time when a push-button is momentarily pressed. And we have also taken the ambient light level into account; when it is dark you won`t be able to read the display so....
Alarm system designs often require circuitry that can detect whether a phone line is active or broken. With this type of design, the primary difficulty is drawing less than 5 µA from the phone line over a line-voltage range of 24 to 58 V as the standard....
When there is no smoke the light from the bulb will be directly falling on the LDR. The LDR resistance will be low and so the voltage across it (below. 6V). The transistor will be OFF and nothing happens. When there is sufficient smoke to mask the light from....
This be simple check pressure level circuit, with integrated number circuit TL431. When use power supply 5Volt in digital circuit. The general feeding signal....
This circuit is usable as a Night Lamp when a wall mains socket is not available to plug-in an ever running small neon lamp device. In order to ensure minimum battery consumption, one 1.5V cell is used and simple voltage doublers drives a pulsating....
Here the simple and low cost FM transmitter circuit. The frequency range of this FM transmitter should be about 89MHz 109MHz. Output power is about 9mW at 9V. R1, R6_12K R2, R4_100K R3_22K R5_1K R7_100R Q1_BC338 Q2_BC548B Microphone JinIn ECM-60P B1....
The following circuit shows about ?DTMF Remote Domestic System Control Circuit Diagram. Features: DTMF signals can be transmitted over a radio to ...
This circuit uses a single chip, IC TL074 for achieving a 5-band graphic equalizer for use in Hi-fi audio systems. The 5-band graphic equalizer is true for radio-cassette player, and car stereos. This unit features: low distortion and low noise, wide range....
The description of this circuit is rather simple. The RTS line of the serial port gives power to the voltage regulator which fixes it to 5 stable volts. A diode is there to protect the serial port from inverse current. The capacitor helps to keep a stable....
AN6591FJM is a single chip IC optimum for PHS, and a quadrature Modulator reception IF and PLL are inte- grated in it. As this IC is housed in a QFN package (quad flat non- leaded PKG), realization of compact equipment through this super-small package is....
Since high frequency voltage-controlled oscillators, or VCOs, are not easy to construct, Maxim ( has produced an integrated 1. 2GHz oscillator, the MAX2754. The center frequency is set using the TUNE input, and a linear modulation input allows the frequency....
Power pulse circuit by LM350 and NE555 . This circuit can use to drive lamp,power LED,DC motor etc. Adjust R5 for output amplitude.Adjust R1 for output power .The LM350 is adjustable 3-terminal...
When it is necessary to send a digital signal between two electrically isolated circuits you would normally choose an optoisolator or some form of transformer coupling. Neither of these solutions is ideal; optocouplers run out of steam beyond about 10 MHz....
This again the one circuit that can is dc regulator the many voltage get simplely. Or Simple step down dc converter multi voltage. By have R1 be formed fix the....
This is my first project using an AVR microcontroller and really the first embedded systems project I`ve done since college. I had two options for programming languages C and assembly. I chose assembly because I was familiar (at least with the 8051) and....
How the processor produces `3` as the output. I realise that this question may be difficult to answer in simple terms. If it is, then a link would help, perhaps to a book...
In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit....
We are using LM3886 which is the revised version of its brother LM3875.Briefly features of LM3886 are; Maximum Output Power: 68W RMS 108W Peak THD: %0.03 at 60W S....
This week was spent completing a number of different objectives. Firstly, the software was downloaded to design the schematic for the circuit to be translated onto a PCB. Much of the week was spent doing tutorials and learning the user interface to make a....
Here is an automatic water tank controller that controls the operation of a water pump through a 12V 10amp relay. When ever the water level of the tank short circuits the points A and B in the circuit diagram, the pump get turned off automatically. This home....
The electret microphone has a current of 200uA which changes by +- 3 uA depending on sound waves. This sets the voltage across R1 to 2V and the voltage across the mic to 4 volts. As the sound hits the mic the current through R1 increases slightly reducing....
The following circuit shows about Boost Converter Circuit Diagram. This Circuit Based On The 555 IC. Featrures: only requires an `of the shelf` ....
The LM324N is one member of the LM324 family,this family consists of four independent, high gain,internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of....
Presented in this letter is a very low-power monolithic 1.9GHz silicon LNA which draws a total current of 1.75mA including bias circuit....
Free-energy" or "G-solar energy" as solar infrared radiation energy stored in the gravitational field. Alternative terms: "Aether heat", "2nd-material layer Heat" In the link below, professor KonstantinMeyldescribes in detail simple experimental setting of....
FM transmissions can be received within a range of 40 km. If you are in fringe areas, you may get a very weak signal. FM DXing refers to hearing distant stations (1500 km or more) on the FM band (88-108 MHz). The term DX` is borrowed from amateur radio....
This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today....
This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and RX-2B from Silan Semiconductors. TX-2B / RX-2B is a remote encoder decoder pair that can be used for remote control applications. TX-2B / RX-2B has five channels,....
The schematic for the crystal bandpass filter/amplifier board appears below (left) withimages of the assembled and boxed unit appearing below center andright. The signal frequency bandpass filter isconstructed over a ground plane and housed in its own....
An old Nokia phone charger with 5. 6 V output, so I tried to adjust it to 12 V. By changing the Zener diode though I manged to do that, but I can`t understand its circuit (I replaced the 9v1 with 16v Zener). I would really appreciate any help to understand....
Plug the diode VD under test into sockets X1 and X2. Stabilized power supply adds reverse breakdown voltage to VD and the stabilized voltage value Uz can be read from voltage meter V, and the stable-working current value can be read from the milliammeter mA....
This circuit requires a regulated 10V-DC front end capable of supplying 2 Amps. Begins the charge period at 240mA and at full charge switches automatically to a float condition (trickle charge) of 12mA. The capacitors should be the ceramic 50V (or greater)....
The 8051 became widely popular after Intel allowed other manufacturers to make and market any flavors of the 8051 they please with the condition that they remain code-compatible with the 8051...
This circuit is used IC number NE555 set up to stable multi vibrator. It produces a frequency rectangular patch of about 100 Hz. Out to pin 3 through C3 and C4. Before the rectifier power section. Both positive and negative DC 2 series. Positive power supply....
Building your own Zapper. 1 Compositor 1 micro farad, C2, I like the un-polarized because it allows you not to worry about positive an negative sides. If you do get one with a longer leg that`s the positive, see schematic for proper placement. 1 resistor for....
LH0024 IC small signal IC designed for general purpose switching and amplification due to its low voltage, low voltage and three different win the election 1N4148 silicon small signal diode planar epitaxial used for fast switching applications with a reverse....
It is a wireless doorbell with a cost of about $10. 00. So, we have to change our attitude to building projects and use items such as this to learn how things work and modify them to suit our own requirements. This doorbell uses quality components. It`s not....
An HD44780 Character LCD is a liquid crystal display (LCD) display device designed for interfacing with embedded systems. These screens come in a variety of configurations including 8x1, which is one row of eight characters, 16x2, and 20x4. The most commonly....
This is a relay driver that is based on a PIC16F84A microcontroller. The board includes four relays so this lets us to control four distinct ....
This simple circuit indicates the amount of power that goes to a loudspeaker. The dual-color LED shows green at an applied power level of about 1 watt. At 1. 5 watts it glows orange and above 3 watts it is bright red. The circuit is connected in parallel....
This is the story of the Fredbox, a rig that first saw the light of day in 1974 in Cambridge. In the last few months it has been restored to full working order to enjoy the renewed interest in AM operation on 2m in the UK. For several years I`d worked local....
This low cost bass treble circuit consists of some capacitors, resistors, and two T/C pot for BASS and TREBLE control. this circuit can be made without even a veroboard. You just solder components as this circuit network is not so complex. It has only....
This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete iso....
Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. a 32. 768 KHz square wave from a common watch crystal. The output can be fed to a 15 stage binary counter to obtain a 1 second....
The main part of this circuit is the LM386 amplifier chip. It also uses a transistor input to buffer the input signal and provide extra gain for the LM386. The little unit has helped me out on numerous occasions when trouble shooting any amplifier circuit....
As I`m working from a single power supply and I`m trying to keep the design small, I`ve been using the LM386n-1 IC. Also, how would you suggest I control the frequency, which component value should be changed to achieve this - I`ve tried messing with all the....
This LCD terminal provide two modes of operation by selecting jumper J1. When J1 is open the terminal operate as a normal ascii display terminal, when J1 is closed the terminal displays the input serial data in hexadecimal format. This mode is useful for....
The following post illustrates a simple light toggled/operated remote control circuit, which can be activated by an ordinary flashlight or more effectively through a laser beam unit (key chain type). The LDR is connected across the base of thetransistor and....
The battery voltage has to pass through R1 before reaching the load at the output and therefore the current passing through it is proportionately transformed into voltage across it. When the battery voltage falls beyond a certain low voltage threshold, the....
The circuit shows a simple triangle and square wave generator with a common dual operational amplifier LM1558 to produce very low frequencies around 10 kHz. The time interval for one half cycle is about R * C and outs of supply of 10 mA. The amplitude of the....
Using a K-12 tube amp with a NAD C542 CD player, there is no need for a buffer or line level preamplifier. The K-12 is a very polite and sweet amp with all the warmth of it`s "hot bottle" heritage. However, when I compare the K-12 with my monoblock chip amps....
The High Power Amplifier has great advantages are 5000W ultra-light, high-power audio amplifier, without switching-mode power supply. This ambit is of an 2 x 2, 500W RMS Stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof....
The output assign modules uses a 16V8 GAL for address decoding and enable signal generation. Figure 44 shows the pin assignments for the GAL used in the output assign module. The VHDL code used to generate the GALs is included in the appendices, on page The....
I have an almost mint condition Fisher 800b hi-fi amplifier that I want to convert into a mic pre. All of the power supply SS diodes need to be replaced with modern, low noise parts. All electrolytic caps. need replacement. The signal caps. may still be....
The other thing I thought of is using a phase shift oscillator followed by an inverter to turn the sine into a square wave, but it semms a rather crude solution. I`m also looking for the schematics to a frequencydivider. I know you can use a flip flop to....
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....
This Project Automatic Room Light Controller with Bidirectional Visitor Counter using Microcontroller is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately.....
