Top Circuits Page 204
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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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This Circuit is a simple Analog to Digital Interface with a capability of 10 to 12 bits resolution. 10 bits means 1024 counts or parts of a full scale FS which is close to 3-1/2 1999 counts. In this 1 V can be read as 1. 000 V that means even 1mV can be....
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This was a Student Project of mine, it is a very basic instruments that could do most of the tasks on a test bench. The cabinet used, was available as a part of a Hi-Fi DIY System, The Range and Mode switches were Modular Stackable Interlocked MultiPole....
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In circuit diagrams given in equipment manuals, voltages at various points in the circuit are usually marked. A deviation from these values indicates that some component has failed and eventually leads to clues for isolating the faulty areas. Specifications....
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This was a small circuit made for driving an Impact counter. The heart being ICL8038. It must have been a Motor driving a Conveyor, the motor has a feedback attachment called Tachogenerator. Only part of the circuit is shown here. See the image of product....
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LM311 is a comparator, It operates from single 5V supply or dual supplies, input current 150 nA, 50 V-50 mA output drive capability. TTL-CMOS compatible output. The Output is open collector so it can sink current but cannot source, a totem pole output can....
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The Measured Value and The Setpoint are two inputs to a Control System. The Measured Value is the Amplified input of a Transducer or Sensor for some Parameter that needs to be controlled. It could be Pressure or Temperature etc. The Setpoint is the User....
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A Center tap 50Hz Step Down Transformer with two diodes is used to get a train of Positive Sine Pulses at 100Hz which is applied to Q6 base via R51. 2N2646 is a unijunction transistor(UJT) in a TO-18 metal package. The control voltage or voltage proportional....
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This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone. The dial tone we heard when we pick up the phone set is call Dual Tone Multi-Frequency, DTMF in short. The name was given because the tone that....
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Function Generator is an essential laboratory equipment. The module described here is based on high quality XR2206 IC. 1Hz - 2MHz XR2206 Function Generator is capable of producing high quality sine, square and triangle waveforms of high-stability and....
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This new stereo FM Micromitter is capable of broadcasting good quality signals over a range of about 20 metres. It`s ideal for broadcasting music from a CD player or from any other source so that it can be picked up in another location. For example, if you....
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The capability to support multiple satellite positioning systems is increasingly a requirement for automotive navigation systems. The UMSZ2 Series GNSS module from ALPS Electric meets these requirements at a very compact form factor ..
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This circuit is of an 2x 2, 500W RMS stereo amplifier, super-light and without switching-mode power supply. The circuit just shows a channel, and the power supply that it assists to the two channels. The audio circuit should be duplicated, but the power....
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To listen old vinyl LP`s in a correct sounding on a sassy with dynamic cartridge you need a circuit, named RIAA corrector. This circuit you can find in old amps, but it isn`t embedded in home cinema equipments or amplifiers can be obtained nowadays. Also, if....
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For those who are lazy like me, turn on or off the bedroom light without getting out of bed, simple clap your hands is amazing. Thinking about it I projected one for me. Several projects of clappers can be found on the Internet, and most of them do not use....
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This easy as well as cheap but effective device is mainly intended for your ease to leave your fish autofed. You need no longer worry your fish would starve as this autofeeder would replace your job. This autofeeder device will expell pellets by quantity as....
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The purpose of this project is to develop a self sufficient Mailbox (real one) that will be powered only by the sun and that will display the number of the house, but only in accordance with the battery level. The system must work autonomously when there is....
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This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it....
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This is an improved version of the Darkroom Timer originally created by Stan Ockers (1999). Some extra features were added and the PIC code was modified accordingly The complete schematic, PCB and silkscreen are available in high resolution pdf format. The....
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To start with, there is a step-down mains transformer with a secondary winding rated at 24 V/3 A, which is connected across the input points of the circuit at pins 1 & 2. (the quality of the supplies output will be directly proportional to the quality of the....
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It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have got here. The power transformer should be capable to deliver at least 25A at 17.....
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Crystal radios have been around for over 100 years and exist in many different shapes, sizes and complexities. Some are definitely better than others, but wired correctly and connected to a good Antenna and Ground wire system, this simple little AM radio....
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A relay sequencer is used in a radio transverter and is use to activate particular stages in order after short delay. This project describes how to build this sequencer. It has the following features. This stage is used to switch the output / input of the....
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The objective of this project is to use inexpensive PIR sensor to detect if a human has moved. To build this project I use a PIC18F25K20 microcontroller to detect if the sensor had change state and it will emit a sound from the speaker or piezo, the MCU also....
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This is the circuit that sparked off all the other Link Telephone Intercom designs. Originally designed back in 1996 with heavy duty relays and their contact banks, it was updated late last year with the addition of IC1 in place of a simpler transistor....
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This project describes how to make a digital voltmeter using a PIC microcontroller. A HD44780 based character LCD is used to display the measured voltage. The PIC microcontroller used in this project is PIC16F688 that has 12 I/O pins out of which 8 can serve....
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This automotive battery charger project is designed to charge 12V electrolyte lead acid batteries. ....
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This simple code practice oscillator project for beginners to Continuous Wave Morse Code uses a 555 timer to generate a dit or dah sound when the key is pressed ..
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150 - 210 secs analog delay timer project for control of devices that need to have a minimum off timer before power can resume to prevent damage to the devices ..
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Build Your Own Door Bell Chime using 555 timer integrated circuit, a speaker, 5 resistors, 4 electrolytic capacitors, 1 ceramic capacitor, 3 diodes, 1 pushbutton switch and 9 V battery as power supply....
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This electronics educational game uses a NAND IC, a Latch IC and a few peripheral components to construct a project that is able to tell who among the four person press the button first ..
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The RFID technology is fast penetrating the automotive market with the passive keyless lock application which will soon replace the remote control used to open or close the doors of the vehicle ..
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This simple LED Light flasher project uses a Hex Inverter 74C04 IC to generate a square wave pulse which is used to alternately ON and OFF two LEDs ..
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In the design of microcontroller based electronics project, the use of Reset IC is critical for highly critical applications that need to ensure that the MCU will only operate at its optimum voltage. Without the use of reset circuitry, the MCU may go into a....
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Build your own simple power failure alarm monitoring system using a AC Relay that will trigger off a buzzer when the mains power supply cuts off ..
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Construct a variable 5A, 2V to 25V Regulated Power Supply using LM338 Adjustable Regulator. Power supply schematic and parts list is provided here ....
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Thyristor is a switching device based on internal regenerative feedback of 2 transistors. One of the most popular type is called silicon controlled rectifier(SCR). They are basically a PNPN structure. They are very reliable and have current ratings up to a....
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Timer circuit has been used in many projects and there are basically 2 types that are used these days. One of them is the use of analog RC circuit where charging of the capacitor circuit determined the T of the circuitry. This type of circuitry has larger....
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This simple electronics timing light uses RC circuit as a delay OFF timer to control an incandescent lamp by using a relay ..
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This Digital Dice electronic project uses a combination of 555 timer, 7490 decade counter, 7483 4-bit binary adder, 7447 BCD to 7 Segment Decoder and the 7 segment display the digit ..
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This electronic timer switch will ON your light for 100 seconds, OFF for another 100 seconds and ON again for 100 seconds after an hour of powering up the circuit. Good home project to build ..
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This simple home alarm project can be used together with a momentary contact of a motion detector to trigger an alarm similar to police siren for a duration from a few seconds up to 220 secs ..
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If you are looking for a digital light sensor that is able to measure the intensity of light and easy interface with a microcontroller, Intersil ISL29001 is one such device ..
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Phone In Use Indicator Electronics Project using 5 resistors, 2 NPN transistors, 4 diodes and 2 light emitting diodes ..
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This temperature switch uses a few discrete components to trigger a buzzer when the temperature of the surrounding increases. Suitable for use as a simple fire alarm indicator ..
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A summary of the varactor or varicap diode used in many radio frequency circuits to provide an electronically variable capacitance ..
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Christmas is coming and its that time of the year again when the electronics student or hobbyists thoughts turn to making a Christmas circuit for their home and especially one that flashes a few lights. There are many circuits and kits on the market that can....
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The PNP Transistor is the exact opposite to the NPN Transistor device we looked at in the previous tutorial. Basically, in this type of transistor construction the two diodes are reversed with respect to the NPN type giving a Positive-Negative-Positive type....
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Electronics Tutorial about Combinational Logic Circuits that use Logic Gates to make Multiplexers, Encoders and Solid State Switches....
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Electronics Tutorial about Mesh Current Analysis and Mesh Analysis Examples used to Analyse Complex Electrical Circuits in DC Theory....
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Electronics Tutorial about the Hall Effect Sensor and Magnetic Hall Effect Switch which is an Output Transducer used to detect Magnetic Fields....
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Electronics Tutorial about Passive High Pass Filter Circuit including Passive RC High Pass Filter First Order Frequency Response, Bode Plot and Construction....
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Electronics Tutorial about the Passive Band Pass Filter Circuit, including Passive RC Band Pass Filter First Order Frequency Response and Bode Plot....
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Electronics Tutorial about Active Low Pass Filter including Low Pass Filter Frequency Response, Op-amp Voltage Gain and Active Filter Construction....
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Electronics Tutorial about Active High Pass Filter including its High Pass Filter Frequency Response, Op-amp Voltage Gain and Active Filter Construction....
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Electronics Tutorial about Active Band Pass Filter including Band Pass Filter Frequency Response, its Resonant Frequency and Second Order Response....
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Electronics Tutorial about Light Sensor including Photocells, LDR, Photodiodes, Phototransistors, Photovoltaic Cells and Light Dependent Resistor....
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Electronics Tutorial about DC Motors, Electrical Motors and Stepper Motors used as Actuators including PWM and Transistor H-bridge Motor Control....
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Digital Electronics Tutorial about the Logic NOT Gate also called an Inverter and the Logic NOT Gate Truth Table used in TTL and CMOS Logic Gate circuits....
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Colpitts Oscillator Tutorial and the theory behind the design of the Colpitts Oscillator which uses a LC Oscillator tank circuit to generate sine waves....
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Electronics Tutorial about Quartz Crystal Oscillator including Harmonic, Overtone, Pierce Oscillator and Crystal Quartz Oscillator Circuits....
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Hartley Oscillator Tutorial and the theory behind the design of the Hartley Oscillator which uses a LC Oscillator tank circuit to generate sine waves....
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Electronics Tutorial about the RC Oscillator Circuit, RC Phase Shift Oscillators and how a Tuned RC Oscillator Circuit produces sine waves....
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Wien Bridge Oscillator Tutorial about the Wien Bridge Oscillator Circuit which uses a RC Phase Shift Oscillator to produce sine waves....
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Electronics Tutorial about Multivibrators including Monostable Multivibrator Circuits, Astable Multivibrators, Bistable Oscillators and Clocks....
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Electronics Tutorial about the 555 Oscillator and How the 555 Oscillator can be used as a 555 Astable Oscillator Circuit to Generate Square Wave Waveforms....
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Electronics Tutorial about Bistable Multivibrator also known as the Bistable Flip-Flop or Two-shot Multivibrator constructed from Transistors or Logic Gates....
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Electronics Tutorial about the Monostable Multivibrator Circuit also known as a One-shot Monostable Multivibrator used as a Pulse Generator Circuit....
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Have you got rhythm Do you want to transfer that rhythm to your computer or hardware sequencer Probably the easiest way of achieving this is to use MIDI drum pads that can be hit with drumsticks, and the data can be stored in real time with any errors....
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This allows up to 8 analogue inputs (with a range from 0 to 5 volts) to produce selectable MIDI control output commands. The analogue inputs could be rotary or slider potentiometers which are connected to 0 to 5 volts. Also the inputs could be connected to....
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The MIDI Bass Pedal uses the MIDI keyboard encoder (MKE), which is capable of encoding any number of momentary action, push to make, single pole single throw (SPST), switches from 1 up to 128 to produce the equivalent MIDI note-on/note-off data commands. The....
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The sustain pedal is also known as the Damper Pedal. When operated it sends out a controller value of CC64. When the pedal is pressed ON the unit outputs a value of 127, when released OFF the unit outputs a value of 0. Tone-generators without the....
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The Theramidi is a new musical device, based on the Theremin, which produces a MIDI signal relative to the movement of objects to or away from it. The MIDI output is controlled by the intensity of light falling onto two Light Dependent Resistors (LDRs). One....
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The project called Digital Code Lock using AT89C2051 ². LCD is used for display and a keyboard is used to input the keys. This project source code is written in C. This a simple project with efficient hacking prevention from Brute Force etc. The basic user....
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Adjust the component values in the two RC networks to get exactly the tones you want. 3V low stand-by current. Kit includes 1 x switch, 1Watt 8ohm speaker, 2 x AA batery holder, COB and mother board. COB PCB size: 16mm x 29mm. (CPSSG5)..
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The Wien-bridge oscillator, consists of an Operational Amplifier (OA) in a non-inverting configuration with gain 1 + R2/R1 and a RC feedback network....
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Oh, one thing I forgot to mention about the battery ""circuit"" I attempted to salvage the circuit and put it inline with the new battery,....
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Hi everyone! I found this circuit in my computer (i don`t remember where i got it and when) and i was wandering if it`s able to dim 220V LED BULBS? it ....
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Hi Ben. You need to connect pins 1 and 13 of the 4053 to the virtual ground rail (top of C4), not the circuit`s 0V rail. The way you have it, when the ....
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Originally Posted by CDRIVE Thanks for clarifying that. Since you have a dual (+-) supply a SPDT relay will suffice. Do you want a solid state....
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Hi All, I am currently working on a project that requires a 0-10V DC supply to be converted into a linear fequency range - square wave. for instance....
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Hello everyone, I need help to modify this light dimmer circuit which is connected to PIC12C508 microcontroller. This circuit is designed for the....