Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
New Circuits Page 11
Arduino Light Sensors
I`ve been working on a project that will allow me to determine the number of sun hours available in a given spot, and track that over time, as a component of solar power installation design. The idea is to get a light detector in the sun, record the number of hours it is lit at full intensity, and map that to photovoltaic equivalence.
FTDI Circuit Schematic
6 Watt Hi Fi Audio Amplifier Using TDA2613
A 6 watt audio amplifier circuit using TDA2613 is shown here. TDA2613 is an integrated Hi-Fi audio amplifier IC from Philips Semiconductors. The IC is swi..
dancing light using 555 timer
A dancing light can be easily constructed using a 555 timer wired in astable mode. Please read the article Astable Multivibrator using 555 Timer before continuing. This circuit blinks two LEDsalternativelywith some delay and it can be easily modified to include more LEDs or for controllingincandescentlamps. Time period of oscillation is determined
Heart Rate Monitor
Strictly speaking, this simple circuit shouldn t work! How could anyone expect an ordinary light dependent resistor photo cell to â€˜see through a fingerti..
Phototransistor for High Impedance Voltmeter
This circuit is designed to provide an inexpensive way to create a High Impedance Voltmeter while making use of an inexpensive analog or digital multi meter. The circuit is specifically designed for testing phototransistors. This the figure for the circuit; When measuring voltages in high resistance circuits the resistance of the voltmeter itself
Simple Frequency Meter
TDA2030 active speaker audio systems with 60 watt output power
A very simple multiway active speaker audio systems can be designed using the TDA2030 audio IC. This TDA2030 active speaker audio system circuit is designed to provide the best possible acoustic performance since each loudspeaker is specially designed and optimized to handle a limited range of frequencies. The midrange section consists of two fil
Programmable Timer of timer circuit
Programmable Timer in this website is very simple made from only 2 iC of wide range circuit and description of programmable timer various timer project.
Electronic locust killer device 2
The electronic locust killer device is composed of the square wave oscillator circuit and high-voltage generator circuit, and the cirucuit is shown in Figure 3-192. Square-wave oscillator is composed of the counting divider lC and resistors R5, R6, capacitor Cl and potentiometer RP. High-voltage generator is composed of the transistors VI, V2,...
Wien bridge oscillator circuit
In this laboratory experiment, we need to design the frequency determining network for a 1k Hz sinusoidal oscillator. Therefore, we should set: Capacitance = 100nF Resistance = 1520 ohm
servo motor control using plc wiring
AC to AC Power Supplies and Transformer Circuits
Active amplified transformer isolated signal splitter that enables hum-free connection of1-guitar to more than1-amp as well as having a direct output Transformers for Audio Interfacing: Discussion on using audio transformers in equipment interconnections, read also Line-level transformers in High-End Audio
Auto-Fill Valve with Arduino
Part Fill valves are widely used in Rainwater tanks. The valve will open once the water level in the tank has fallen to a low posit..
tv monitor diagram blog
Ee bicycle lights schematic diagram
12v to 220v 100w transistor Inverter
ADUC816 1MIPS 8052 MCU + 8kB Flash + Dual 16-Bit ADC + 12-Bit DAC
The ADUC831 MicroConverter is a fully integrated 12-bit data acquisition system-on-a-chip. Like all of ADI`s MicroConverter products, it features precision A/D & D/A conversion and a Flash Microcontroller on a single chip. For detailed documentation on the ADUC831 please click the "Datasheets" buttons at left. The ADUC831 is 100% hardware backward
UDA1343TT UDA1343TT Economy Audio CODEC With Features
The UDA1350AH is a single chip IEC 958 Audio decoder with an integrated stereo digital-to-analog converter employing bitstream conversion techniques. Besides the UDA1350AH which is the full featured version in QFP44 package, there also exists the UDA1350ATS. The UDA1350ATS has IEC 958 input to the DAC only and is in SSOP28 package. The UDA1350AH...
Capacitive liquid level sensor circuit
FIG. 1 (A) illustrates the circuit diagram of one embodiment of the fluid level detector of the present design. The supply voltage for this circuit is typically provided by a 12-volt automobile battery which is reduced to a 5-volt DC source voltage by means of a voltage regulator comprising the combination of resistor R1 and zener diode Z1....
TCA440 Datasheet Specification
TCA440 is a AM receiver circuit for LW, MW and SW in battery and line operated radio receivers. It includes an RF prestage with AGC, a balanced mixer, sepa..
switching loads with MOSFETs
The biggest issue is that the RDS_on of the used MOSFETS is, driven with 5V gate voltage, too low. The other issue is that the the reverse voltage that occurs, when the MOSFET switches from on to off state kills the transistor. This revese voltage is caused by the parasitic series inductance of the heatbed, hotend heater cartride or resistor....
LA1061M Antenna Switching Diversity Circuit For FM Tuners
On-Glass Antenna Amplifi er AGC IC LA1070 The LA1070 is an Automatic gain control IC for use with automotive on-glass Antennas By Sanyo Semiconductor Corporation
Symmetrical power supply circuit electronic project
A symmetrical power supply, can be designed using this circuit diagram. This symmetrical power supply is designed using a simple operational amplifier and some classic electronic components Resistances R1 and R2 form a high impedance voltage divider. Operational amplifier makes sure that artificial potential mass is the same as the voltage at the
Telephony Circuits and DTMF Circuits
9-line telephone sharer This circuit is able to handle nine independent telephones (using a single telephone line pair) located at nine different locations, pdf file Bidirectional telephone line simulator without using telephone lines, couple, test and demonstrate all types of telephone equipment such as: answering machine, modem, fax, call record
simple intercom circuit with
This is a 2-station simple intercom circuit build based on transistors part and using common 8R mini speakers. The speaker works as microphone and generate sound, so there is no need microphone for this intercom. The "press-to-talk" switches should have a spring-return so the intercom can never be left ON, push on switch can be used for this kind
2 line intercom plus a telephone changeover switch
Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for connecting the other telephone. In this simple parallel line operation, the main problem is loss of privacy besides interference from the other phone. This problem is obviated in the circuit presented here. U
Low Cost High Voltage Power Supply
I have designed this high voltage, low current power supply for various experiments in systems & synthetic biology. I have cleaned up the design and I am placing the schematic and board layout online below! This circuit outputs up to +1, 866VDC at under 1 mA or can be tapped at various points for +622VDC or +933VDC. This is useful for either DIY Bi
When trying to move things with microcontrollers, there are basically three kinds of motors that are most useful: DC motors, servomotors, and stepper motors. Most all motors work on the electrical principle of induction. When you put electric current through a wire, it generates a magnetic field around the wire. By placing a charged coil of wire...
Garden Railway Sensors
A sensor in garden railway applications. Hall Effect sensors are the electronic equivalent of a reed switch. You can think of them as a cross between a reed switch and a transistor. They are frequently used to determine the rotational speed of a spinning device, such as the platter of a hard drive or the drive shaft of an automobile. A small...
Japanese Antique Vacuum Tube Radios
Servo Motor Control with PIC16F84
This simple micro-control circuit controls a servo motor according to a 3-state switch. A servo motor acts as an actuator in 3 position. It has 3 wires, one for VCC, one for Ground and another one for position control. The last signal is a single pulse with variable width. The pulse width can vary between 1 and 2 mSec. An 1 mSec pulse width turns
Cook Your Own Distortion
Later in the sixties, the first distortion effect boxes were made to simulate the sound of razored cones and overdriven amps. Now, most amps have a distortion control, but distortion effects are still popular. Now we`re going to discuss the methods of creating distortion with effect boxes. When talking about distortion, you can usually hear the...
TDA0161 metal detector electronic schematic
This metal detector circuit diagram is based on the TDA0161 monolithic integrated circuit, designed for metallic body detection by detecting the variations in high frequency Eddy current losses. Output signal is determined by supply current changes. Independent of supply voltage, this current is high or low according to the presence or the absenc
car audio amplifier using tda2003 ic
The circuit is Easy to construct. TDA2003 is an integrated radio amplifier from ST Micro electronics that like short circuit protection for all pins, thermal over low harmonic distortion, low cross over distortion etc. In the circuit given here TDA2003 is wired as a mono amplifier operating f
Fireflies based on tiny AVR
When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this project very simple. I must try it. one day "I was always fascinated by the emergence of patterns. One I like most is the synchronization of hundreds or thousands of fireflies. First they flash
Adding 1 PPS and 10MHz Outputs to the Z3801A
Make Z3801A GPS-disciplined oscillators more useful by making 1 PPS and additional 10MHz signals available on the rear panel, and providing a 1 PPS signal on the DCD line of the serial connector so the unit could serve as a reference clock for an NTP server. Although I ultimately want to add a distribution amplifier/splitter for the 10MHz sine...
ttl power supply with crowbar protection
auxillary fuse lighter fuse burned out
Here is the fuse block diagram, with the Aux Pwr fuse highlighted. I would check both sides of the fuse with a test light or multimeter to make sure it is working at that point. I am assuming that you have checked for power at the Aux Power socket - center pin - and power is NOT there. I wouldn`t want to be going after a power issue when the...
Simple transistor tester circuits
This is the Transistor tester into the Circuit or PCB. When your project do not works, the tester electronic parts or..
Lx1995 Led Driver: Camera Flash Application
The M-88L70 is a full DTMF Receiver that integrates both bandsplit Filter and decoder functions into a single 18-pin DIP or SOIC package. Manufactured using CMOS process technology, the M-88L70 offers low power consumption (18 mW max), precise data handling and 3V operation. Its Filter section uses switched capaci- tor technology for both the high
freeze protector circuit
This is the simple freeze protector circuit diagram. It is also called timing circuit. It is just hobby project for beginners. When you need to operate automatically any device in the fixed time later after coming AC power supply, you can use this circuit. The circuit output pin 3 is connected with resistor (10k) and output 12 volt relay. Relay is
10A Auto battery charger circuit diagram
12 volt switching power supply using LTC3810-5 switching regulator
Using the LTC3810-5 synchronous step-down switching regulator controller can be designed a very easy and simple 12 volt switching power supply electronic project using few external electronic parts. LTC3810-5 synchronous step-down switching regulator controller can directly step-down voltages from up to 60V, making it ideal for telecom and automo
A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude..
Protection For Voltage Regulators
build automatic car battery charger
This is a project for those who want to build their very own Automatic Battery Charger. This is a project made by duc_tech..
why have my power dooe locks lost the power to operate correctly
The longer the locks are not used with either the remote or central lock button, the stronger the power surge to the door lock motors. After being "activated" even once, it is like it drains all the power out of the capacitor or whatever stores the charge if indeed this is the case. two three attempts in a relatively short time and they become ver
Car audio amplifier 40w
This Car audio amplifier gives ouput of 40w from 2 ohm speaker. his car amplifier circuit gives an output power 40 watts per channel at 2 ohm load, and 22 Watts on 4 ohms load. Perhaps you are wondering how to get 40 watts of power And answer is : you can find 2 ohm speakers (if any), or you can connect an amplifier with a pair of 4 ohm speakers
Logic gate using current source and diodes
You check the voltage at the anode and cathode of the diodes and determine whether or not it is conducting. With a current source I am kind of confused on what to do. I can`t determine the state of the diodes for a given input combination (00, 01,10, 11) because I don`t know the voltage at the anode of the diodes. I have simulated the circuit using
Wideband Active Small Magnetic Loop Antenna
There are now extremely wideband software defined radios (SDR) where the wideband antenna is a natural choice. Wideband small magnetic loops (WSM loop) are used already 3-4 decades and I was curious to see what can be reached with them and to evaluate their usefulness as a wideband SDR input. The WSM loop should work in short circuit mode in...
Ultrasonic anemometer Ultrasonic wind sensor
This ultrasonic anemometer serves for the 2-dimensional capture of the horizontal components of the wind speed and the wind direction as well as the virtual temperature. On account of the high measuring rate this device is suited very well to capture gusts and peak value measurement without sluggishness. The accessible exactness with the measureme
Linear RF Power Meter
The National Semiconductor LMV225 is a linear RF power meter IC in an SMD package. It can be used over the frequency range of 450 MHz to 2000 MHz and requ..
Laser Diode Driver
We can use a voltage-controlled current source to implement a laser diode driver. Compared with a a Switched (PWM) drivers, this simple linear laser diode..
The 1K resistors in the circuit are essential so that the LED`s turn on at different audio levels. This circuit is easily expandable with more op-amps, and is not limited to use with the LM324. The 33K resistor on the schematic is to keep the signal input to the circuit at a low level. The circuit in it`s current form will accept line level inputs
Bicycle back Safety Lights
This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles as a back light, or to put on by jogger/walkers. IC1 is a CMos version of the 555 IC wired
varying brightness ac lamp
In this circuit, an SCR is used to slowly vary the intensity of a 120 volt light bulb by controlling the time that the AC line voltage is applied to the lamp during each half cycle..
interrupts interfacing with 8051 primer
GSM Based Home Automation Project Report
This is a good project on GSM Based Home Automation and submitted in partial fulfillment of the requirements for the degree of bachelor of technology in Electronics and Communication engineering. The goal of the project is to develop a system, which uses Mobile technology that keeps control of the various units of the home appliances, which execut
Metal detector using 555 timer
LED Emergency Light Circuit With Battery Over Charge Protection
The following circuit was designed by me in response to the request sent by PP. The article describes an LED emergency light circuit with advanced features such as, over charge battery cut off, day time auto-disable, and need less to say that the circuit switches ON the LEDs automatically when AC mains fails and reverts to charging mode when power
transistors IR Emitter/Detector with 555 timer alarm
This circuit detects when a tube is empty and pulses a piezo buzzer in. 5 second intervals. I have it working with 5v on a breadboard, but I need to move it to 12v from a wall wart. Secondly, with 12v R1 should be 220 1W, but I want to stick with 1/4W resistors, maybe 510. Is that possible I realize that will bring down the 50ma current to...
Phone Spy Transmitter
Here is a very simple telephone broadcaster transmitter which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this phone transmitter is that the circuit derives its power directly from the active telephone lines, and thus avoids use of any external...
Cheap 12V to 220V Inverter
12V Flourescent Lamp Inverter
Fluorescent tubes use far less energy than incandescent lamps and fluorescent tubes last a great deal longer as well. Other advantages are diffuse, glare-free lighting and low heat output. For these reasons, fluorescent lighting is the natural choice in commercial and retail buildings, workshops and factories. For battery-powered lighting, fluores
Camera internal flash circuit
This circuit is composed of the light measurement circuit and the flash circuit, as the figure shows. It can be used in the POPTICS (one kind of popular integration camera), the Franka X-500 and the WIZEN-860S cameras. It is composed of the following circuits: the light measurement circuit is composed of the VT1, VT2 and the light metering...
Stepper Motor Controller Schematic
We are using 6v/2amps 1. 8degree stepper motor. In this circuit CD4050 hex buffer using to connect to the microcontroller. The output of cd4050 is connected to the TIP122 of the BASE. The Emitter and collecter is conneted to 1N4007 diode the colleter of tip122 is connected to the stepper motor coil. In this demo we are using Uni polar Stepper...
6DJ8 Tube RIAA Phono and Line Preamplifier Schematic
6DJ8 Tube RIAA Phono and Line Preamplifier Schematic. The HT power supply uses tube rectification and regulation
12v 15a voltage regulator
FM modulator circuit
The FM modulator circuit (frequency modulation) is built with a Motorola MC1648P oscillator. Two varactors, Motorola MV-209 are used to frequency modulate the oscillator. The 5000 ? potentiometer is used to bias the varactors for the best linearity. The output frequency of approximately 100 MHz can be adjusted by changing the value of the...
Help with crystal radio circuit
Ok first of all I am sort of a complete noob I made a `crystal` radio circuit from parts i got out of an old busted radio, a LM386N audio amplifier ..
Combination Lock (PIC16F84) TutorialCircuit Project
Arduino GSM Shield
The Arduino GSM Shield connects your Arduino to the internet using the GPRS wireless network. Just plug this module onto your Arduino board, plug in a SIM card from an operator offering GPRS coverage and follow a few simple instructions to start controlling your world through the internet. You can also make/receive voice calls (you will need an ex
Portable AM Receiver Using ZN414 Integrated Circuit
The circuit exemplifies the use of ZN414 IC to produce a handy AM radio receiver. ZN414 IC a composition of transistor tuned radio frequency (TRF) circui..
make yourself a simple versatile long duration timer
Arduino Master Reader
In some situations, it can be helpful to set up two (or more!) Arduino boards to share information with each other. In this example, two Arduinos are programmed to communicate with one another in a Master Reader/Slave Sender configuration via the I2C synchronous serial protocol. Several functions of Arduino`s Wire Library are used to accomplish t
This is a project of a 555 buzzer circuit. NE555 is a timer IC comes in 8 pin dip package, it performs wide variety of tasks in electronic circuits. The circuit mentioned below will produce a buzzer sound when 9 volt power will be applied. The frequency of sound can be changed with the help of 1K variable resistor and changing the value of 15K res
500W low cost 12V to 220V inverter
65W notebook laptop power adapter circuit
Using TOP269EG off-line switcher IC, (U1), in a flyback configuration can be designed a very simple high efficiency notebok laptop power adapter. TOP269EG IC has an integrated 725 V MOSFET and a multi-mode controller. It regulates the output by adjusting the MOSFET duty cycle, based on the current fed into its CONTROL pin. Common-mode inductors L3