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 6
Single and Double Switch Cell Voltage Equalizers for Series-Connected Lithium-Ion Cells and Supercapacitors
Automatic Street Light Controller Circuit
This circuit is an automatic street light controller. Sensors used to detect changes in light is LDR (Light dependent resistor), the working principle of Light dependent resistor is exposed to light when the resistance value of LDR great, but if not exposed to light or dark then the resistance value of LDR. This circuit when the dark conditions (n
GSM Phone Jammer Circuit Schematics
It is based on NE555 as simple noise-maker whose output is fed to a single transistor oscillator. The oscillator is designed to operate between 800MHz and 2GHz which happens to be the frequency span used for GSM phones. The frequency of operation is set with a trim-capacitor. Ovaj bi do 30 metara, a ovaj drugi bi da mu neko javlja na mail. Ne...
10-100kHz sine-wave oscillator
LCC configuration for Tesla Coil impedance circuit
Because the coupling coefficient is so low, the primary self-inductance tends to short out the driving signal. However, if a series/parallel set of capacitors is used to couple energy, then the input impedance will increase at resonance, thus achieving decent power transfer efficiency. The LCC configuration shown in Figure 14 was chosen to match...
Mosfet Power Amplifier 100 Watt Schematic Diagram
At this time a unsophisticated MOSFET amplifier or else power Amp which Output power is plus/minus 100 Watt/RMS with8 Ohms otherwise ohter plus/minus 160 Watts /RMS with 4 ohms. Regarding this circuit simplicity, The distortion is plus/minus 0. 1 %. In support of mob-width -3 db(decibel) is increase for 4 Hz to 96 Khz, it is narrow by C1, R1, C2...
FUNCTIONAL BLOCK DIAGRAM
Wireless IR Headphones circuit
Using this wireless IR Headphones circuit electronic project you can transmit audio signal using an infrared connection .This wireless IR Headphones circuit diagram electronic project is composed by two parts : transmitter and receiver . This is not an RF transmitter , so you will need to design both parts of application . Using this infrared...
230v led lamp
High speed data switch circuit
This circuit is a small representation of a very low cost printer sharer i made very long ago. This is as much i can remember of the basic ideas behind the product.
Mosfet forward converter circuit
Serial programmer circuit for AT89Sx MCUs
Simple RS-232 ISP programmer for AT89Sx devices. This device is intended for education purposes and for hobbyists. It has been tested with AT89S2051 and AT89S8253 along with USB to serial port converter cable (with PL2303 chip).
Contactless Live Line Detector
Live-line detector is a circuit that detects the presence of a live mains conductor circuit operation: capacitive coupling between the live conductor and the..
4 stage voltage detector comparator circuit
LED Circuit with Timer 555
This circuit LED reproduces the first LED sequence at this time used by FISA on behalf of Formula single racing. It may perhaps be alive used with slot car sets (such for example HO shin up AFX/Life Like/Tyco sets) or else means of communication controlled cars. IC1, a 555 timer IC, is used as a watch pulse generator. Its output is fed via NAND ga
STK4050V audio amplifier circuit
This 200 watt audio amplifier circuit diagram is based on STK4050V high power audio amplifier IC and is designed do deliver up to 200 watts audio power on a single channel . STK4050V 200 watt audio amplifier circuit is pin compatibility with other STK amplifiers series . Because of current mirror circuit application the distortions are reduced...
Bluetoothß„? Front-end Ic T7024 Design Guide
The HV9911DB2 is an LED Driver capable of driving up to twenty 100mA LEDs in series from an input of 9 16V DC. The demoboard uses Supertex`s HV9911 IC in a boost topology. The converter has a very good initial regulation, (+/-5%), and excellent line and load regulation over the entire input and output voltage range (<+/- 1%). The full load ef
up down led sequencer
I have a 10 light LED bargraph, I want to make the LED`s light one after the other until all the LED`s are lit, and then have the circuit cycle back down until all the LED`s are off again. A simpler (analog) way is a LM3914 - Dot/Bar Display Driver operating in the bar mode. If you put a triangular ramp voltage at the input, the LEDs will light up
LPF circuit for rear fill decode
Need a little help getting this schematic figured out, most of it is understood with the exception of the triangular objects(amps-opamps?) Not sure what those are or how to implement and order them. Here is the diagram thus far(planning to test with a lpf at 1k and 500, with the hpf staying around 80-100hz)
Network RJ45 Cable Tester Circuit
This is a multifunction RJ45 network cable tester. It is the design of the network cable (RJ45) test, and telephone (RJ11). It is cheap and easy to use. It works for network, telephone, cable with RJ45 half Registered Jack plug immediately indicate whether a crossover network cable or straight, flashing a yellow or green LED. If something is br
solid state tesla coil with 555 timer
AT89C2051 Serial CMOS to LED Driver
metal sensor detector circuit schematic
The metal detector circuit is shown here that the limits represent the sake of simplicity for a metal detector, but the design works remarkably well. It only uses 40, 106 Hex Schmitt inverter IC, a capacitor and a search coil and of course batteries. An advantage of IC1b Pin 4 is to be connected to a medium-wave radio antenna, or it should be w
Phase shift oscillator circuit
The normal assumption is that the phase shift sections are independent of each other. Then using above Equation the loop phase shift is –1800, when the phase shift of each section is 600. This occurs when ω=2πf = 1.732/RC because the tangent of 600 = 1.732. The magnitude of β at this point is (1/2)3. So the gain, A, must be equal to 8 for...
VHF Audio Video Transmitter
The circuit presented here is a simple audio/video transmitter with a range of 3 to 5 metres. The A/V signal source for the circuit may be a VCR, a satellite receiver or a video game etc. A mixer which also operates as an oscillator at VHF (H) channel 5 TV frequency is amplitude modulated by video signal and mixed with frequency mo enna, contains
Sine Wave Oscillator
Information 1997 Honda Civic Charging System Wiring Diagram
arduino on breadboard
On the Uno boards, there`s an IC which is responsible as a USB to serial converter and it makes it possible to program the Arduino and also communicate with it from the computer. The problem here is the IC is an SMD (Surface Mounted Device). The R3 uses an ATmega 16U2 while the older revisions uses the 8U2. Installation is pretty easy.
Mini Audio Amplifier with MOSFET Technology
Parts List The circuit consists of preamplifier, tone controls, and regulated DC power supply, while providing a power output of 18 Watts for 8 Ohm load a..
gsm interfacing with lpc2148 arm7 primer
Vending Machine Controller
average vending machines are commonplace at railway stations, airports, fast-food restaurants and even in companies. Press a switch and the machine delivers a cup of your favorite drink. This looks quite a simple operation but has a very complex logic behind it: It involves use of twelve precision timers and four counters apart from physical devic
schematic shutdown controller
DTL-TTL Controlled Buffered Analog Switch
This analog switch uses the 2N4860 JFET for its 25 ohm rON and low leakage. The LM102 serves as a voltage buffer. This circuit can be adapted to a dual trace oscilloscope chopper. The DM7800 monolithic IC provides adequate switch drive controlled DTL-TTL logic levels. Here is a schematic drawing:
Frequency counter using PIC16f84
This is a simple frequency counter based on a micro-controller PIC16F84. Its maximum working frequency is around 30MHz, and have a 10Hz resolution, and having low current consumption (15mA), and very simple assembly. This uses 7 numbers seven segment LED display to display the frequency. The electrical schematic is very simple, given that most of
Stereo 12W Bridge Amplifier Circuit TDA2007A
The following schematic shows 12 W Bridge Amplifier circuit diagram as an application of the TDA2007A a class AB dual audio power amplifier which is designed for stereo application in music centers, TV receivers and portable radios. According to the datasheet, this TDA2007A has features such high output power, high current capability, AC short...
DC Servo 2
Hi all, I am planning to make another LM4702 amp with SAP15 devices (which is published in another topic in this forum). The amp will be in non..
Intelligent Presence Simulator
However effective a domestic alarm system may be, it`s invariably better if it never goes off, and the best way to ensure this is to make potential burglars think the premises are occupied. Indeed, unless you own old masters or objects of great value likely to attract professional` burglars, it has to be acknowledged that the majority of burglarie
I want/need better headlights. I`ve been trying to study up on this - including the on-going forum discussions. But, I think I need some basic info..
hardware control with computer
When the water is empty the wires in the tank are open circuited and the 180K resistors pulls the switch low hence opening the switch and LEDs are OFF. As the water starts filling up, first the wire in the tank connected to S1 and the + supply are shorted by water. This closes the switch S1 and turns the LED1 ON. As the water continues to fill the
LC compliant boost converter circuit diagram
The main ΣΔloop, which again operates in steady state, is fully controlled by summing comparator Q2, which amplifies the ripples of the sensed inductor current and output voltage by gains KI and KV, respectively, to generate an internal variable s. This variable s , is regulated to zero by the feedback control action of Q2, as in conventional...
VOLTAGE SHIFTING CIRCUIT DIAGRAM
As mentioned in the chapter about the DAC, this circuit shifts the voltage output range. The following diagram explains it's operation and structure. The circuits outputs are connected to the input pins of the power opamps.
Backup Lamp Circuit
This little circuit will pay for itself many times over the first time it is used, especially if you are in the shower. This back-up lamp stays off as long as light falls on the CdS photocell from either the NE-2 or from room ambient light. So, if the power fails at night, the lamp will light.
alternative on off switch circuit using 4069
Bus masters diagram
It is possible to add bus masters to the system, but a different bus architecture would be required, since the Integrator/CP uses the AHB-Lite bus protocol, which allows only one bus master (the ARM CPU core). One way to add bus masters in a Logic Tile would be to instantiate a bridge in the IM-LT3 FPGA, and splitting the Z[127:0] bus at the...
Arduino Differential Controller
I experienced faulty DS18B20 reads on my tank thermometers, probably due to my heatshrink/silicone waterproofing method. It gave me a chance to improve my code to make the controller more tolerant of bad reads, but my tank thermometers have now been replaced with waterproofed DS18B20 probes, which are very cheap on ebay. it is NOT reccommended
A Smart Barn Door Drive for Astrophotography
A tracking mount for trusty Minolta SRT-101. My untracked photos of Hyakutake had not done the comet justice; the exposures were too short. If one mounts a camera to a sturdy tripod and opens the shutter for several minutes, the developed picture will be trailed, with every object in the frame creating a short or long streak depending on the...
FT0 frequency synthesizer circuit
I m planning to construct a frequency synthesizer circuit and i found this circuit diagram..but i m unable to figure out a component..can any1 explain 2me what is the part with the VDD from pin 9,Vss from pin 8 and pin 12 connected to the phase comparator 2
A frequency-selective frequency multiplier can be construct with a PLL system by inserting frequency divider inside the feedback between the phase detector input and the VCO output. Figure below shows the schematic diagram of low-frequency synthesizer with a programmable three decades divider circuit. The frequency-divider modulus N have value bet
Oxygen codoping of ZnS:TbF electroluminescent thin film
Signal Generator circuit
The output level was set to 3. 8V peak to peak, not for any good reason, the first aim was to compare a few different op-amps before trying to further optimise the circuit. The op-amps were TL072, LM4562 and OPA2134. The distortion spectra are shown next, in all cases the 500k feedback level control was set to maximum resistance. Clearly this is
Smooth flasher circuit
GVI Digital Remote Control
GVI Digital Remote Control for DSLR camera is a step forward from my previous remote control for Canon EOS 450D. This remote is based on AVR Microcontroller ATmega328 and is programmed using Arduino IDE GVI Digital Remote Control is a tool for photographers to trigger cameras or flashes based on input signals from various sensors - for the...
really need help on PWM and PPM circuit
hello everyone..im need some helps i`ve construct the PWM and PPM circuit the output going smoothly but i`ve some problem im not very..
simple tv audio video transmitter
A very simple TV audio video transmitter circuit can be designed using this schematic diagram. This TV audio video transmitter circuit can be used to transmit video signals from VCR ( or some other device ) to a TV without using any cable. Video signals input at jack J1 are first terminated by resistor R6 and coupled through capacitor C1 to clamp
Mobile Phone Battery Charger
Small and portable unit, Can be assembled on veroboard Mobile phone chargers available in the market are quite expensive. The circuit presented here comes..
vu meter circuit
the designs of three phases SPWM variable frequency power supply of DSP
The variable frequency power supply, as the important constituent element of the power system, the quality of its characteristic concerns security and reliability index of the overall system directly. Such prominent advantages as the modern variable frequency power supply is succinct by low power consumption, high efficiency, circuit are favored.
APH-1050 Power Amplifier
If 40 watts RMS from 20Hz to 30KHz +/-1. 5 db sounds good to you, then you might enjoy this experiment. The most significant problem with public address gear is the use of audio output transformers which do not have enough iron in them to handle the lower frequency content at the amplifier`s full rated power. Look for amplifiers in which the...
Duty Cycle Selector
Duty Cycle Selector is unique project to select duty cycle in 9 steps up 100% circuit diagram with description of duty cycle selector various digital circuit.
ISP Flash Microcontroller Programmer
This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software which can program both the 8051 and AVR series devices. Figure 1 shows the circuit diagram
Data-Logger Shield for Arduino
There is a small power supply on the board for generating 3. 3V @ 250mA. We don`t use the `built in` 3. 3v regulator on the Arduino because its only guaranteed up to 50mA and some SD card need a lot of power when writing. This supply is nice and steady, we can use it as an analog reference too! We have two sets of bypass caps to try and keep...
lm317t power supply
LM 317T power supply circuit. This power supply is very simple and timeless, contain very few components and will give very stable, regulated adjustable / variable output..
Using a TENS for relief from RLS or Restless Legs Syndrome
Using a battery power source the TENS device produces a high voltage but low current signal at a specified frequency and duration. This electrical current is applied externally to the skin of the body using sticky foam electrode pads. The more expensive units have advanced features like dual-channels, programmable functions, a digital readout,...
This is a project of a ding dong door bell circuit using 555 IC. In the previous article we have discussed about a simple doorbell circuit using UM66 IC which is a CMOS three terminal melody IC. The circuit mentioned here is using NE555 IC and few other components to create doorbell sound. The frequency of sound can be controlled with 5. 6k and 10k
Better-Sounding Active Crossovers
Hi, can anyone explain what the four transistors on the right hand side of each of McBride`s schematics are doing?..
This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively high power outputs, and a certain built-in degree of loudspeaker protection, due to capacitor
Square wave oscillator
By the hysteresis characteristic, the voltage which becomes the H level with the input voltage of the inverter rising from 0 V (Voltage that the output becomes 0 V) and the voltage which becomes the L level, descending from +5 V (Voltage that the output becomes +5 V) are different.
OBD II Car Computer
Using the OBD-II (On Board Diagnostics) protocol, we can read live information from a car`s computer with our NerdKits microcontroller kit, as explained by our guest star, Elena T. , MIT class of 2011. This uses the port under your steering wheel to receive all kinds of information, and is used by auto mechanics for troubleshooting the "Check Engi
hi everyone, my name is mike, i come from a small country called new zealand- i am currently planning to build a 6l6 push pull stereo power and pre..
digital code lock
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 lock is of 5 Digits and Master Lock is of 10 digits so its not easy for an intruder to bre
Using AC for LED Christmas Lights
This circuit uses low-voltage AC to drive a string of 50 or so bi-color LEDs (two LEDs connected in inverse parallel). Power to the LEDs is controlled by the Triac and the two optocouplers which have their photo-transistors effectively connected in inverse-parallel. Depending on which optocoupler is turned on, the Triac applies positive, negative
LM1830 low level detector schematic circuit design
This LM1830 low level detector can use an audio indication (speaker ) or a visual indicator (LED- light emitting diode ) that will light when the level is too low. This low level detector circuit will generate a 500 Hz audio signal when the level is low. This low level detector require a 16 V DC power supply and the recipient must be from some m
wiring vacuum diagrams
Lux meters attiny26-16 light measurement circuit
Lux meter circuit atmel attiny26-16 microcontroller based on the value of the LED displays on the display lux with LEDs placed on 2sk1061 MOS.
555 IC Monostable multivibrator circuit
Beige Bag Software has been providing affordable and innovative circuit design tools since 1990. B2 Spice provides schematics as well as analog, digital and mixed mode electronic circuit simulation. Integrates with EAGLE and CADSTAR PCB software..
Latest British Police Car Siren circuit
The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency to alternate between 440Hz and 550Hz at a 1 Hz cyclic rate. The transistor 2N3055 is used to
Train Horn Circuit Diagram based IC NE556. The circuit is quite simple and easy to built, also it is inexpensive. With this circuit design, it will not give high output power, so you need to add audio amplifier to make this train horn circuit louder. Imagine for a moment that you are driving down the road in your truck and it has been a long and d
DIY Audio Function Generator Part 1
Most of my Blog posts involve short 3-4 hour projects/hacks that I just build up for learning and fun. I thought it was time to develop something a bit mo..
Quick and Easy Wireless Circuit
The Quick and Easy Wireless circuit is not terribly difficult however it will take some double checking to make sure you have everything hooked up properly before working the first time. The main devices used in the circuit are the 7805, 18F452, RC Receiver and RC Transmitter. The 7805 regulates the +9v battery down to +5v which the PIC and al