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 13
How the capacitor works (in a debouncing circuit)
Understand how come the LED will not light up as the Capacitor looks like it`s by-passing the switch. When the capacitor is full, it doesn`t transmit/conduct electricity You`ll notice that I`m very beginner, but after 20 hours of reading various tutorials, I still can`t really figure out something very simple; how the full capacito
ProtoSnap Pro Mini Quickstart Guide
BASIC CIRCUITRY of Metal Detection
The search loop may be constructed in several different ways; however, the method offered here should get you headed in the right direction. Refer to Fig. 2 as a guide for constructing the loop. The loop form should be constructed from non-metallic and non-moisture-absorbent material. A sealed wood form will do, and it can be either solid or hoop-
SLAVE FLASH TRIGGER
The SCR is wired across the trigger circuit of the flash gun. Normally, the SCR is off, so the flash gun is able to charge to its trigger voltage. Photo transistor Q1 is used to monitor the light level. When a high-intensity flash occurs, Q1 briefly con-ducts and supplies gate current to the SCR. That causes the SCR to turn on, which then triggers
Schematic Audio Power Amplifier with IC TDA2612 Schematic Diagram
This amplifier circuit based on IC TDA2612 produced by siemens, minimum voltage require for this circuit is 10 Volts and amximum voltage require 35 volts DC. Power output 25 watt with 4 ohm impedance. Frequncy response 20Hz to 20kHz. Quiescent current is 70 mA. This is a mono circuit amplifier. See circuit below : You are reading the Circuits of S
capacitor Choosing components for a triacs snubber
Interfacing the BT139-600 TRIAC with this MOC3051-M Opto-triac. Build a snubber circuit for the TRIAC as shown in the MOC3051M opto-triac`s datasheet @ page 8, figure 12. The load will be a 230V AC, 4A motor. What are the recommended characteristics of the Rs, Cs and MOV in that schematic (the type of the resistor and capacitor, power...
Phase detector and light self-test card A2
A simple way of phase locking microwave local oscillators
The circuit is presented as a starting point - there will be some experimentation needed for each individual case. For the popular microwave bands the LOs are usually generated from overtone crystal oscillators followed by multipliers, with the following table showing the usual LO frequencies for the narrowband segments along with the associated...
Simple, easily transported VSWR meter consists of high-gain amplifier, narrow-bandwidth (100-Hz) selective amplifier tuned to 1000 Hz, and variable-gain output amplifier driving low-cost VU meter. Ideal for nulling type VSWR measurements. Draws only about 6mA from 9. V transistor battery. Closing S1 increases gain about 100 times for Iow. Ievel...
Touch SwitchCircuit using NE 555 IC
A touch switch circuit schematic using 555 IC.When touched on the touch plate a relay will be switched ON for a preset time. This time can be adjusted too..
light bulb pcr
Based on this `manual` PCR machine I built a few weeks ago, the Light Bulb PCR machine uses a light bulb and an old computer fan as its heating and cooling elements: Instead of the switches pictured above, the unit is now controlled by an Arduino Uno, Code Available Here. It uses a thermistor (a resistor that allows more current to flow the more
cmos based single zone alarm
This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset. It has provision for normally-open and normally-closed switches and will accommodate the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and Inertia Sensors)..
Solid laser range finder reception circuit
The amplification of this circuit is about 12000 times, the bandwidth is 0.5~14MHz, the input resistance is 700?, the output resistance is 35?(measured with 5MHz), the output noise level is 0.6~0.8V. In figure, T1, T2 are direct coupling amplifier, they are connected into parallel current negative feedback. Zener diode 2CW11 improves T2 emitter...
Low Noise Power Supply for Audio Circuits
This low noise audio power supply circuit can reduces noise and ripple voltage by 40dB over the 100Hz to 20kHz audio range. In portable application such as..
555 metal detector
lm723 variable power supply circuit design
This LM723 variable power supply circuit design is a very simple variable power supply that will provide an output voltage between 8 and 30 volt at a maximum output current of 3 ampere. This LM723 variable power supply circuit design project has a very low output ripple voltage of 0. 5mV and offer various protections like : shortcircuit protection
smith kanapadz replication 6
ok LOL i will buy transformer to run in a 12V battery but this one is not similar to what the user romerouk from overunity is using?..
CMOS Integrated Switched-Mode Transmitters for Wireless Communication
Measured output power and efficiency of a 6 dBm 130nm CMOS class-D inverter chain, using gate bias variation to create a pulse width modulated inverter output voltage (Cijvat et al. , 2008). (b). Efficiency versus output power of two amplifiers, one with 6dBm and one with 12 dBm output power. The supply voltage was 1. 2 V. The 6 dBm amplifier...
Dog Repellent Circuit
The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and cat repeller, wh..
Personal Applause Sign
Build a Hackduino board as explained here. Cut the speaker off of your wireless doorbell receiver. Leave as much wire connected to the receiver as yo..
signal Can someone break down how this receiver works
It is on top labled toy car receiver. The toy car transmitter is easy enough to understand, and I suspect that the receiver is essentially working the same way, but backwards and with more filtering. I have no experience in RF except that I saw this circuit before and asked someone how it works. The first stage is tuned at 27, 145 Mhz and will...
Triangular Wave Generator Using Op-amp
This is a circuit diagram of the triangular wave producing circuit. We can produce the triangular wave with a series of two Op-Amp. You can use the LM741 op-amp. Op-amp first (left) is a series of comparison (comparator) while the Op-Amp circuit second (right) is the integrator. example : initial condition at the output 2 is negative, then output
Simple 7-Segment Counter Circuit
The circuit diagram of 7 segment counter circuit has been published here. This circuit consists of counter IC CD 4033 as its central part.
Simple low power Inverter Circuit (12V DC to 230V or 110V AC) diagram using CD4047 and IRFZ44 power MOSFET
This simple low power dc to ac inverter (dc to ac converter) circuit converts 12V DC to 230V or 110V AC. By doing simple modification you can also convert 6V DC to 230V AC or 110V AC. It can be used as inverters for home needs to enable light loads (electric bulb, CFL, etc) at the time of electricity failure. You can construct this circuit ofsimpl
dc motor control circuit
AV (Audio/Video) Wireless Transmitter
This circuit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system! Q3, VC1, C13, C16 and L3 all make up a colpitts oscillator circuit that fluctuates form 220~250MHz.
PIC Microcontroler PS2 Keyboard
thyristor trigger circuit schematic diagram
The circuit takes its input from the "zero-crossing detector", which provides it with a 0-to-1-to-0 pulse to "set" the R-S flip-flop and release the ramp circuit (A to Ramp) for it to start the ascent of the timing ramp.
ELECTROLYTIC RUST REMOVAL
Experiments in rust electrolysis. The idea of using electricity to convert rust back into iron is not a new one, and electrolysis has been used for metal restoration by collectors and archaeologists for decades and the results can be very impressive, with shiny metal being visible after proper treatment. The exact requirements, though, are...
Portable solar charger designed using LM358N
As you can see in circuit diagram, this portable solar charger circuit, is based on a LM358N operational amplifier and one transistor. This regulator provide a constant 2. 4 volts DC and can be used for powering small devices that needs to be powered from two AA battery cells. Because the regulator has a low drop down voltage of 0. 3 volt you sho
Selfrunning Free Energy 5 KW Kapanadze 2
Trying to estimate the pump input energy your circuit needs, let say your average voltage input (waveform D) is around 6V (12Vpp) and let say your average input current (waveform G) is around 1. 5 - 2mA (8mApp) so to maintain the loaded oscillations in L1-L2 tanks you need about 9-10mW input power (rough and rigorous estimation of course). This...
Compact DWDM laser Temperature Control with the MAX8521
Compact thermal control solution for DWDM (Dense Wavelength Division Multiplexing) laser modules can be made using a MAX8520/21 and a single op amp..
Radio alarm clock
The program makes use of the built-in AD converter of the PIC16F874 for sensing the touch buttons. The PIC has 8 AD ports, seven are used for the 7 touch-buttons, 1 is used for the light measurement. In order to receive DCF signals, you have to add a DCF module (e. g. Conrad nr. 641138 - 89) which will provide a digital TTL level DCF signal which i
Mini FM Transmitter
pic16f877 up down counter code and proteus simulation
This PIC16F877 microcontroller tutorial answers the question, "" How to implement a up down counter using PIC16F877 ? "" Using PIC16 simulator (Proteus) you..
Solar Cell and Photovoltaic Circuits
This almost trivial circuit may be used to charge a pair of AA or AAA sized cells in the sun. I have used it to keep my Palm Pilot and walkman radio running perpetually. This is an unregulated charger, proper charging is achieved by placing the unit in the sun for a known amount of Time, this Time varies according to the
Brief introduction of circuit diagram of the inverter and principle
The inverter is kinds of direct currents can battery, storage battery Change into alternating current generally 220 volts of 50HZ sine waves or rectangular waves Device. Our common emergency power supply, 220V exchange to generally all invert the direct current bottle. Come briefly and say, the inverter is that one kind turns direct current into e
detection Sample Application with LHI 778 PIR Sensor
Light Sensor Circuit Using Op Amp 741
This is a one of the light sensor. This circuit is a dark sensor that is based on op amp 741 IC as main control. This circuit is a simple design for sensor the light at the night. This is the figure of the circuit. For sensor the light is using LDR. Operation of the circuit is under normal conditions the resistance of the LDR is high, keeping
Humidity Tester Circuit Using Sensor
A simple humidity tester circuit using just a LED, transistor, and a few resistors is explaind with a neat circuit schematic..
8 Line Intercommunication using 89c51s=
Circuit for controlling 8 appliances using TV Remote
The IR circuit can be used to switch devices using TV Remote. Normal circuits can switch only one device. But using this circuit, different devices can be controlled using same remote with different switches. In this circuit, we interfaced 8 devices. These devices are switched using remote keypad -1 to 8. AT89S52 microcontroller is used to control
astable multivibrator transistors
An Astable Multivibrator or a Free Running Multivibrator is the multivibrator which has no stable states. Its output oscillates continuously between its two unstable states without the aid of external triggering. The time period of each states are determined by Resistor Capacitor ( RC ) time constant. In the above diagram we can find two transisto
24V CRT high voltage power supply circuit diagram
Random Access Memory? (RAM)
the Poppet 500 milliwatt AM transmitter
The Poppet" is a half-watt AM transmitter designed by Mr. Doug Gibson of England. The original design was published in issue 84 of SPRAT, newsletter of the GQRP Club. The version shown here incorporates changes suggested by Steve Hartley and others. Although it was designed to work with a microphone and to be used in the 160 meter band (1800-2000
A Cmos Based Motorcycle Alarm circuit
This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can immobilize the bike - flash the lights etc. Any number of normally-open switches may be use
DIY Infrared Remote Extender Unit
Here`s a few details on the Infrared Remote Control Extender unit I designed and built to control my NAD T752 A/V receiver. The NAD T752 has an IR input socket on the back of it for system installs where the unit has to be inside a cabinet or at least out of normal Infrared control range. Many newer A/V receivers have this feature, and so it came
Halogen Lamp Dimmer schematic
Low noise preamplifier circuit
Keyboard is a basic and essential element of an embedded or microcontroller system. For small and hobby projects a 4x4 (hex) matrix keyboard is sufficient. The keys in the matrix keyboard are arranged in a matrix arrangement in order to utilize the port pins of the microcontrollers efficiently. Here we can interface 16 keys by using just 8 pins...
Smart Battery Charger with Graphical Data Logger
Common Collector Colpitts Oscillator
Design a Colpitts Oscillator in a common collector configuration using a single BJT. Provide base current to get the transistor operating properly, and you can do this using a potential divider (between Vcc and gnd): use resistor values as high as possible (bearing in mind the loading effect of the base current) in order not to load the LC...
Flasher circuit negative switching
Actually did (do) have access to the resistors but yes measured open (disconnected from any ground source or input source)..
Infrared circuits related resources
Computerized infrared remote project a very simple device for recording and playing back streams of infrared data, in particuliar the codes transmitted via remote controls, software is supplied to be run in both DOS and Windows, with information on interfacing the CIR into your own C and Visual Basic applications, Infrared emitter & detector this
High Input Voltage regulator using LM340
This circuit is the High Input Voltage regulators, which generate voltage 5V. In these circuit LM340 input voltage must remain within the limits specified in the data sheet. If the device is operated above the absolute maximum input voltage rating, two failure modes can occur. With the output shorted to ground, or, even with the output is not grou
Electronic equipment is not `cheap` and can be damaged in a number of ways, by electro-static discharge, by lightning and by transmitting withno antenna attached, or into an antenna with a high SWR. The controller described herein attempts to facilitate the safe and automatic tuning of a mag loop antenna by reducing the output power to an...
Serial Voltmeter using the PIC16C71
Building a serial voltage meter to measure from 0 to 5 volts DC is actually pretty easy. Using MeLabs PicBasic, and Microsoft`s Visual Basic Version 5 Pro. You need Visual Basic Pro version because you will have to use Basic`s MSComm control. This control is not available in the Visual Basic 5 Learning Edition. The PIC16C71 simplifies the task
16 G— 2 LCD Volt Meter & Ampere Meter With PIC Schematic Diagram
Volt meters & ampere meter with PIC can be used to measure voltage and current simultaneously. The series of volt meters & ampere meter with PIC16F876A PIC is used as a data processor voltage and current are measured. This circuit uses the viewer in the form of 16 G— 2 LCD used for the data display voltage and current measurements. In the article
How do I use a quartz crystal in an oscillator
Design of a compact reversible fault tolerant field programmable gate array
universal high resistance voltmeter
The full-scale deflection of the universalhigh-input-resistance voltmetercircuit shown in the figuredepends on the function switch positionas follows: The term IFS in the aboveequations refers to meter`s fullscaledeflection current rating inamperes. It must be noted that neithermeter resistance nor diode voltagedrops affects meter current. A high-i
Light Tracking Servo System
Sun tracking systems are very effective in increasing the efficiency of photovoltaic (PV) arrays, and are essential for concentration PV systems. The following paper discusses a light tracking servo model which has been built to simulate the movement of a PV array. A mathematical model is developed and a qualitative comparison of the...
Super Light Sensor
This "Super Light Sensor" responds to minute fluctuations in light level, auto-adjusting over the range from about 200 lux up to 60, 000 lux (ie, from a modestly lit room to direct sunlight). It has lots of potential uses - eg, detecting a car entering a driveway, a person moving in a room, or wind rustling the leaves of a tree. At the same time, i
Donald Smith Devices too good to be true 14
Originally Posted by kajunkreations The natural resonant freq of the L2 is 31.5 mhz. I calculated the 40K by using LC meter and LC resonance..
Micropower Voltage Regulator Schematic Diagram
This circuit was industrial to power an AVR microcontroller from a 12 opposed to run-acid battery. The watchdog itself draws solitary 14 µA. Of avenue, at hand are dyed-in-the-wool ICs, in lieu of model from Linear machinery or else Maxim, which can subsist used, but these can be very brutally to pick up grasp of and are commonly barely to be had
Electrical Stepper Motor Manufacturers
Microcontroller projects 2
This module is HC-06 a slave mode serial bluetooth data link. The chips is made by CSR. In this project, my mobile phone will talk to AT89C2051 via HC-06. All the complication has been put in the cage (in the java library and bluetooth module), so what I need to do is just create terminal program for mobile phone written in java (J2ME), and create
ultrasound How do I drive an ultrasonic transducer with an Arduino
A cat deterrent with an Arduino, something akin to this. I have figured out detection, and now realize that I need to use an ultrasonic transducer to produce the `blast` that I need.
80W Electronic Ballast
Schematics for an 80W electronic ballast to drive 2 48"" lamps..
usb car charger
This is a project of a mini USB car charger circuit. The circuit is very simple to build using only three components. Heart of the circuit is a LM78M05 IC which is a 5V positive voltage regulator IC. This IC has many built in featuers like thermal overload protection, short circuit protection, safe operating area protection etc. The circuit can b
18 dB LT1253 DDS Amplifier
This 18 dB gain amplifier was built Manhattan-style to evaluate the Linear Technology LT1253 dual video amplifier as a candidate output amplifier for DDS systems employing the Analog Devices AD9850 and similar devices. This dual amplifier was chosen to take advantage of its high gain-bandwidth product. By utilizing both amplifier sections, a very
A Simple Secondary Side Vcc Source For Low Power Constant Voltage Constant Current (cvcc) Power Supplies
Mini Split Acs
If you switch gears over 5k during a solar eclipse you`ll have to have your nut bearings revalved. There is a lot that goes into it. Same goes for making a sammich. They`re Fedders Inverter units. 12K & 18K. I understand they`re tricky to get the charge right due to the variable speed compressor. I also believe there`s a `test` mode that runs at...
GP2D12 distance sensor
A distance sensor would be a nice addition to Mindstorms robots, but ultrasonic ones were bulky and power hungry, and simple infrared method like the one I used in my radar car detects obstacles but don`t give true distance measurement. The solution came from Andreas Peter (thanks Andreas for showing me these devices !) who interfaced a Sharp...
Back to qrss
For some reason, I`m getting back into the universe of QRSS, or very slow Morse code. I goofed around with this for a while, writing some software to record audio and produce the necessary FFTs so that you can read Morse from these incredibly long Morse messages, but lately haven`t done much lately. It`s really just a Colpitt`s oscillator, with a
Simple TV Remote Control Jammer
This circuit confuses the infra-red receiver in a TV. It produces a constant signal that interferes with the signal from a remote control and prevents the TV detecting a channel-change or any other command. This allows you to watch your own program without anyone changing the channel ! The circuit is adjusted to produce a 38kHz signal. The IR dio