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 5
Multiple Capacitor Charger
The circuit is shown in Figs. 1-2 and tested succesfully. This is a 555 timer IC based charger. The circuit is operated by 8.4VDC. For R1=2.7K, R2=3.3K, and C1=10nF, oscillation frequency is about 25KHz. Measured period is about 40µs when there is no toroid load. In the presence of toroid, period shrinks to about 30µs. So the frequency jumps...
Solder aid is an extremely useful device which sucks the poisonous gas due to melted soldering alloy and sucks it away using an ordinary 12VDC fan removed from a computer. The circuit is shown in Fig 1. It is basically a 1.25-14.5VDC regulated voltage source built around LM317 IC.
Avramenko is a Russian scientist and invented the plug shown in Fig. 1 to transmit electrical energy over a single wire. It’s a simple circuit consisting of two diodes, one capacitor, and a flash tube. The high-voltage (HV) terminal is connected to the HV output of an auto ignition coil. The + HV pulse charges C1 through D1. D2 is OFF during...
Explanation of Bedini’s Pulse Motor and Generator
When the magnet approaches, N flux inside the bifilar coil increases. An opposing flux is produced by the coil and an EMF is generated across L1 and L2. The EMF across L1 applies + voltage to B-E terminals of Q1 and turns it ON. Q1 saturates rapidly and a high current is withdrawn from B1. This current builds a strong magnetic field inside the...
An Electromagnetic and Ultrasonic Shield
I like to present a Shielding Carpet for shielding Electromagnetic (EM) and Ultrasonic waves. Shielding EM waves is easy. You need to enclose whatever you want to shield by some metal. Faraday cage is a good example.
Electron Collection and Emission Using a Flyback Transformer
I've designed a high-voltage generator which uses a flyback transformer as the output stage. Flyback transformer circuit diagram is shown in Fig. 1. And I like to share some of my findings with you.
Secret of the Great Pyramid
I like to post some thoughts on some of the functions of the Great Pyramid of Egypt. It's been claimed that the Great Pyramid might be a Power Plant, a Tomb, a Transmitter/Receiver to talk with some other Worlds, or a message from Atlanteans to future generations in the form of a massive monument. Let's start with Ionosphere.
Star-Gate for Hyper-Space Travel
This type of travel may be possible if two space points can be connected by a vortex channel in aether. The channel allows continuity of matter, energy, life etc by establishing a connection between two distant points. The vortex channel can be created by a rotating and metallic ring held at high-voltage (blue ring in Fig. 1).
LIght activated switch Circuit
Light activating and deactivating switches are simple to build when you are provided with a LDR (sensing element) and 555 (switch activator). These kind of sensor circuits are widely employed in many applications and may come in handy when you intend to build a simple light sensing circuit. LED is used in the above circuit to indicate switching,...
DIY Tremolo Effect
This tremolo effect circuit uses the XR2206 and the TCA730 IC which is designed as an electronic balance and volume regulator with frequency correction. The circuit is use full for stereo channels and it also has the ability to simulate the Lesley effect aka rotating loudspeaker effect. How does the tremolo effect circuit works Balance and...
LEDs are available in a number of different sizes and shapes with most being round topped cylinders that are either 3 mm or 5 mm in diameter. These sizes are also commonly referred to as T1 (3 mm) and T1 (5 mm). The body of most LEDs is made of plastic that is either the same color as the lit LED, generally referred to as a diffused LED, or of a...
At first glance this circuit looks fairly complex, but when broken down, can be divided into high pass and low pass filter sections followed by a summing amplifier with a gain of around 20 times. Supply rail voltage is +/- 9V DC. The controls may also be adjusted for use as a band stop (notch) filter or band pass filter.
Float Switch Water Level Measurement
A Float Switch is a device which is typically used to measure the depth/level of liquid in a container. As the water rises and reaches the level of the float switch, it begins to float going from the vertical to the horizontal. This closes an internal switch which can then be used to turn on/off a pump, alarm, relay. Pictured above is a submersi
audio graphic equalizer circuit
This is a design circuit for audio graphic equalizers, that are very common as commercial products but circuits for them are very rarely published. This circuit is a simple design circuit. The circuit is needs an op-amp for amplifying the input signal. This is the figure of the circuit. Only one gyrator stage is shown: all 7 gyrators are the same
am to fm converter
The above circuit can he used to hear am statons in ur fm radio .It is a regenerative circuit that samples am signals of all frequency and re transmits them in the fm hand [88-108] an even in the TV hand .The capacitor C1 can be varied to receive different am stations thus providing remote tuning facility .
3 band equalizer
This is a simple 3 band graphic equalizer circuit that`s built by a single op amp IC LF351 IC and few passive components. The component values of this circuit are not very critical and can be replaced with nearest values with a little loss on the performance. This is feature make it easy to be assembled from your junk box. This is a figure of the
Adjustable Power Supply with Charger Output
The aim of a DC power supply is to provide the required level of DC power to the load using an AC supply at the input. Different applications require different attributes, but more often than not these days DC power supplies provide an accurate output voltage - this is regulated using electronic circuitry so that it provides a constant output...
Ethernet remote device controller sensor circuit
The main purpose is to show here the circuit diagram and explain the software. We use a UDP application to send commands to the microcontroller. Those commands will then cause the microcontroller to switch on or off the relay. It think it will be possible to even implement TCP. The current UDP software is less than 3k bytes and that is not even...
8W Amplifier Based on IC LM383
This is the 8W audio amplifier with IC LM383 as the main component. Very simple, easy and cheap circuit.
Frequency converter circuit
Frequency converter schematic, frequency to voltage converter schematic, Frequency to Voltage Converter Using TR, Voltage to Frequency Converter Application
807 Tube Triode Connected
This is a very nice amplifier design and it is very difficult to improve it. I am glad about the results because that's a very good way to verify my 6DJ8 and 6L6GC Spice models, like I tell you before, the 6L6GC and 807 have very close caracteristics and I get very close results to what you schematic said It is a really good idea to use the...
3-channel Audio Amplifier circuit
Careful examination of the photos of the amplifier will reveal that the heatsink on the HY60 near-clone I built using the TDA2050A is slightly shorter than that on the original HY60s. I placed this unit at the rear of the amplifier, and the gap provides adequate space for a free-flow of air up the inside of the amplifier. No slots were cut in...
pierce xtal oscillator circuit
This circuit is conventional Pierce type oscillator that uses a JFET. The circuit uses fundamental mode crystals. It has decent performance and reliability if we use a low noise JFET. This is the figure of the circuit. The feedback is controlled by the C1 Capacitance from drain to ground. Adjusting the frequency can be done by adjusting a shunt
Gray Code Circuit
Gray Code. A positional binary number notation in which any two numbers whose difference is one is represented by expressions that are the same except in one place and differ by only one unit in that place. A code composed of a number of bits assigned in such a way that only one bit changes at each increment, or decrement. A binary code in which...
Atmel 89C2051 prototype board
This single sided proto board provides an economical solution for developing and testing the projects around Atmel 20 pin series u-controllers (89Cx051 & AVR). Figure 1 shows the circuit diagram of proto board. All port connections are available for user interface around the proto area including the power supply pins. MAX232 serial driver is used
NJM2574 NJM2574 LOW VOLTAGE VIDEO AMPLIFIER WITH LPF
The NJM2670 is a general-purpose 60V dual H-bridge drive IC. It consists of a pair of H-bridgesa thermal shut down circuit and its alarm output. The alarm output CAN detect application problems and the system reliability will be significantly improved if monitored by Micro Processor. Thereforeit is suitable for two-phase stepper motor application
USB Cellphone Charger circuit
You can charge your Mobile Phone from the USB outlet of PC. This simple usb cellphone charger circuit can give regulated 4. 7 volts for charging the mobile phone. USB outlet can give 5 volts DC and 100 mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone battery is rated 3. 6 volts at 1000 to 1300 mAh.
A8V W8EXI 6CL6 One Tube Transmitter
A8V W8EXI 6CL6 One Tube Transmitter. The operation of the 6CL6 transmitter is actually quite sophisticated..
Diode Radio for Low Impedance Headphones
The most commonly available headphones have an impedance of 2 × 32 ?, this relatively low value makes them unsuitable for such a design. However, with a bit of crafty transformation these headphones can be used in just such a design. To adapt them, you will need a transformer taken from a mains adapter unit, the type that has a...
A surprising number of modules still have an interface based on RS232. No wonder, as RS232 is easy implemented on a microcontroller with two I/O pins and a line driver such as the MAX232. In the case where the master is a PC, the serial port is relatively easy to access on both Windows and Linux. Usually modules implement a text terminal...
This circuit uses the 555 timer in an Astable operating mode and generates a continuous output via Pin 3 in the form of a square wave. This is then passed through the 22 ½F electrolytic capacitor to create a smooth oscillation which then creates the `toc-toc` sound. The speed of the output is controlled by the 250K Potentiometer (VR1).
Low cost Ethernet shield with ENC28J60
One of the most interesting shield that you can mount on the Arduino platform is certainly the ethernet shield, because enable numerous networking applications such as remote control of systems and users, web access and publication of data, and more yet, the simplicity of finding and integrating open-source libraries on Arduino IDE does the...
Wien Bridge Oscillator Tutorial and Theory
Wien Bridge Oscillator Tutorial about the Wien Bridge Oscillator Circuit which uses a RC Phase Shift Oscillator to produce sine waves..
1khz multiple feedback low pass filter circuit
Pins 1 and 5 on this amplifier are trim pins and are not used in the circuit. When not used it is required to leave them floating.
Medium Wave radio reciever circuit
This radio reciever can work with any of the following transistors zn414, mk484 or ta7642.
relay toggle circuit using a 555 timer
This 555 timer circuit toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and discharges when the output is low. When the button is pressed, the capacitor voltage is applied...
Digital Temperature monitor with LM5 and AT89C51
I plugged the temperature onto 8 LEDs (I'm using a DeccanRobots package, and so this was supplied with the board). It worked, showing the temperature in binary form . Now when I tried using my microcontroller with this program I wrote to output the number on 4 7-segments(also included in the DeccanRobots package), it ended up showing me "29.9".
Arduino Analog Input
A potentiometer is a simple knob that provides a variable resistance, which you can read into the Arduino board as an analog value. In this example, you`ll connect a poterntiometer to one of the Arduino`s analog inputs to control the rate at which the built-in LED on pin 13 blinks. Connect three wires to the Arduino board. The first goes to ground
pcb design Need second set of eyes on 555 50% duty cycle soldered protoboard
Bold lines are soldered connections, arrows are wire based connections. Red for V_cc, Black for ground, blue for intermediate connection and gold for primary output. Pins 1, 5 are connected to ground (I recognize that 5 should go to a capacitor to ground, but have omitted it here as it worked without it on the breadboard and space was limited)...
Data transmitter circuit using the TM1V IC
multiplexed 7 segment
The basic technique is the same like the last lesson except fact that we have added a counter which counts between 0000 and 9999. Our counter increments with 1 second delay. /* ` * ` Lesson nr. 12: ` Multiplexed 7Segment as counter mode ` Done by: ` Aureliu Raducu Macovei, 2010. ` ` This code demonstrates displaying number on fo
b1 dc 12 volt
Finding an Electrical Short
Over time, many things can cause electrical problems with your Mustang. Components will get old and worn or a wire can rub against something and expose the wire to metal. I have seen where a body shop will inadvertently crimp a wire when they install a body panel. Sometimes, when mechanical repair is done, the wiring just gets in their way. This i
I`m not all that clear of the difference between a data selector and a multiplexer. Although the designs I`ve been involved in stopped using small scale ICs in the early 1990`s, as the physical side of the work moved into general purpose PALs and MACHs. Following that, any new designs were generated in much larger FPGAs, so there was
Interfacing RFID Reader with AVR MCUs
RFID is a great technology, has may uses and become very cheap and easy to implement these days. This tutorial describes how to interface a RFID Reader with a common Atmel AVR MCU..
60MHz Frequency Meter / Counter 10Hz to 60MHz
This project is nice and small frequency counter that reads frequency from 1 Hz to 50 MHz that I have modified from original designed by Weeder Technologies . I have designed new PCB to fit with 16X1 LCD and change source code for compatible with new small PCB Specifications - Auto-ranging with floating decimal point. - Up to 7 digits displayed...
Parallel fed Colpits oscillator circuit
It is parallel fed because the DC plate current does not flow through the inductor. R3 may be replaced by an RF choke if desired. C3 keeps B+ from appearing across the variable capacitor which is generally a no no. If R1 were not present, C3 might not charge up and there would be B+ on the variable capacitor anyway. R1 makes sure that the...
bjt transistor circuit finding the resistances
I have been given the following circuit diagram and have been asked to compute R2 and RC such that, at the Q-point, the circuit will behave as follows: VCE=5V VBE=0.7V IC=2mA β=100(where β=ic/ib)
Automatic light dimmer circuit
This is an automatic light dimmer circuit. You do not need to dim the lights by yourself. It is so very convenient, because we use the LDR to detect external light. To control the Triac, and the brightness of the lamp next. Suppose low light so there is voltage across the LDR many making the triac a lot of work, the lamp so super bright. But some
how make triacs and leds get along
DIY/Homemade Geiger Muller Clicker V2
High Voltage Circuits
Reading a voltage divider schematic
Ground is used as a reference for the voltage divider, and that each successive point above ground is how much voltage is dropped across the circuit. (So with a 15 volt input, and 5K ohm for each resistor the taps would be 5, 10, and 15 volts respectively. ) What I do not understand is by placing ground at that location, wouldn`t you immediately...
Led or Lamp Flasher Circuit
This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. Especially suited for car or panel pilot lights, this device can drive lamps up to 10W..
all about wiring diagram
This is door knob touch alarm for your home security purpose. The alarm will be activated when someone touch the metal door knod. This circuit won`t work on full metal door. Now we use the batteries are circular, here the designers propose a new concept to design six-sided shape for battery, place the whole up and that is cellular, and compared to
pulse generator circuit
With the relaxation oscillator, we basically achieved a fairly regular square wave. Let's change the duty cycle (and visualize the effect with LEDs). Wire up the following variation on the relaxation oscillator circuit
The aim of this project is to transmit analog sound from a commercial mp3 player digitally using a store-bought laser pointer as the transmitter. This will be achieved mainly by performing analog-digital conversions, and by using a digitally phase-locked loop (DPLL) to synchronize the clock signals on both the transmitter and the receiver. This pr
Crystal oscillator and regulator circuit
The goal of this project was to explore how objects, places, and people can be linked wirelessly. We began discussing how we might approach this task. Will this be for private or public use How many people will be interacting with the project Will we use wireless technologies or a direct connection to the internet What existing applications wil
Triac Dimmer Circuit
The circuit of a simple triac light dimmer shown below can be used for dimming incandescent lamps directly from AC mains. The circuit is very easy to construct and uses very few components. The pot is used for controlling the load power or the intensity of the light. The circuit can be also used for controlling ceiling fan speeds.
low cost capacitance meter
Frequency counter Oscillator schematic
The oscillator provides a 1MHz and a 1khz clock. The 1MHz clock is used as the clock for the microcontroller and as timebase for millisecond measurement. I use a 2MHz and divide it by 2 in order to guarantee a 50% duty cycle. Then three halve HC390 are used as divider by 1000 which can be externally reset. This is necessary to make sure the millis
How to make a JDM Programmer
This JDM programmer works with a RS232, 9-pin(9 wire) DB9 Serial connector on your computer, and is used for loading Source Code (hex files) into your microcontroller. JDM programmers are Cheap and very easy to make. JDM programmer that we are going to make will be used for loading the code into microcontroller board. You can probably buy this JDM
Percussion electronic doorbell 1
The electronic doorbell circuit is composed of the pickup amplifier, monostable trigger circuit, pulse counter circuit, music generating circuit and audio amplifier circuit and other components, and it is shown in Figure 3-113. Pickup amplifier circuit consists of piezoelectric ceramic BC, amplification tube Vl, resistors Rl and R2 and capacitor...
Micro-Ohm Meter Senior Project Page
A digital micro-ohm meter is necessary to verify the condition of shunts used in the Electrochemical Analysis & Diagnostics Laboratory (EADL) at Argonne National Laboratories. A shunt is basically a small resistor. They are used to measure current. The micro-ohmmeter will push 0. 5A of current through the smaller shunts and 10A through the larger s
inverter design shines photovoltaic systems
The electric utility grid-connected photovoltaic (PV) system is an important technology for future renewable energy applications..
4 Watt Single Ended Vacuum Tube Amplifier
Morse Code circuit using ATtiny85
The Morse Beepy is a circuit I designed to be simple and cheap enough for kids and adults to use as a first soldering project, but powerful enough that they could have fun with it. In fifteen minutes, it can be soldered together and programmed to beep and blink your name or secret message in Morse Code.
circuits for motorcycle
Design of a Nonisolated Flyback LED Driver Reference Schematic
Flyback LED drivers are versatile because they can be used for applications that have input voltages above or below the required output voltages. They lend themselves to a simple circuit configuration that keeps the LED current constant without using additional control loops. The circuit described in this application note is designed around the...
Bike Guard Alarm Circuit
This Simple circuit can be used to Guard your bike from theft. It gives a loud alarm tone if somebody tries to start the bike. The alarm disables only when the hide switch S2 is opened. The circuit has little component count and can be easily fixed in the bike. Working of the circuit is simple. The alarm generator buzzer or Horn is activated by an
isp communication with microcontroller
How should I wire up the circuit to connect a TSOP4838 (Radio Shack 276-64) infrared receiver to an Arduino
All you need to do is supply a resistor (I used 200 Ohms, with a 3. 3V supply) to the power line, GND it, then connect the data line to one of your digital pins (I used pin #2)". However, the datasheet shows an example circuit with a 100 Ohm resistor connected to Vs along with a 4. 7 micro Farad capacitor connected between Vs and GND. I`m...
dimmer control voltage polarity changer
EQ DIRECT CONTROL
rgb lcd shield for arduino
This is an old Dynacord Eminent Amplifier, featuring 5 x ECC83, 2 x EL34, GZ34 rectifier and EM84 "Magic Eye". It has two instrument and two microphone inputs with separate bass/treble controls and a master volume. I got it for 50 Euro in VERY used condition and spent about as much for new capacitors and a new EM84. The other tubes were still good
Crystal audio oscillator circuit
Generating variable audio frequencies with crystal precision is not often done because it isn`t easy to make. Low frequency quartz crystals are difficult to find, and each would only provide a singular frequency. Some small tweaking of the crystal oscillator`s frequency with a trimmer capacitor is common, but the variation is almost...