Vacuum Tubes Valves
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Yagi Uda Antennas
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Human Sensing Circuits
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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 8
AN7415 FM Stereo Demodulator
Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. The circuit shown is a stereo FM PLL demodulator designed based on the AN7415. C1 is the input coupling capacitor to block any DC voltage present on the multiplexed input signal. LED D1 is an LED and R1 is the curren
Driving bipolar stepper with uC
I have a bipolar motor, and software written for PIC 12F508 to drive unipolar motor. Is the schematic in attachment correct for this purpose? Coil A1, ..
interfacing to microprocessor
The parallel interface transfers data 8 bits (or more) at the same time, using eight separate wires. It is essentially an extension of the data bus into the outside world. The parallel interface is ideal for inputting or outputting data from devices that are either on or off. For example, a single limit switch uses only one input bit, and an on-of
Lnk606pg High Eficiency 7.6 V 700 Ma Isolated Led Driver
ULTRASONIC SOUND RECEIVER
You won`t be disappointed with the performance of this sensitive ultrasonic receiver. It can let you listen to bugs, bats, engines, and virtually any other source of ultrasonic sounds. This circuit uses a piezo tweeter as an ultrasonic microphone, amplifier stages Q1, Q2, and an LO using a 567IC. Q3 is a mixer that heterodynes the ultrasonic...
Pong Game Console
I created a simple game console that could play Pong and other games with Atari 2600 joysticks, which the Arduino would read the joystick inputs and output the data to a TV with a TVout library. I created this project just for the fact that I wanted to showcase that anyone can create their own miniature consoles to play, but also I wanted somethin
plug socket wiring detailst568astandard
Atmel AVR and 8051 series ISP 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
Homemade exposure unit
Each tub sockets has 2 plastic nibs on the back. For each socket I drilled 2 holes into circuit material. Then I pressed the socket nibs into the drill holes. Finally I screwed the stripe of epoxy circuit material to the wood slat. The wiring diagram to drive 1 or 2 tubes is printed on the top of the magnetic ballasts (see picture no. 14). In my c
99 CIVIC WIRING DIAGRAM COURTESY LIGHTS
99 Civic Wiring Diagram Courtesy Lights Manual PDF.
The Itsy-Bitsy USB Lamp circuit
We`ve called it the Itsy Bitsy USB Lamp. It is such a delightfully simple idea we`re wondering why no-one ever thought of it before. It started life (and continues) as a student project at Massey University in Wellington, New Zealand - and in fact was submitted to us by the lecturer, Stan Swan. When we say simple, we mean it: just a USB plug on...
IC Encoder Chip
This is not a complex function and could be easily coded into a PLD or FPGA. However implementing this function into a small PLD might just use up most of the chip`s I/O pins and defeat the purpose of the PLD. That is; spending more for the PLD, than using most of it up implementing a much cheaper part. However it could be possible to implement th
Fsk Modulation And Demodulation With The Microcontroller Msp430
The FX919A is a CMOS integrated circuit that contains all of the baseband signal processing and Medium Access Control (MAC) protocol functions required for a high performance 4-level FSK Wireless Packet Data Modem. It Interfaces with the modem host processor and the Radio modulation/demodulation circuits to deliver reliable two-way transfer of the
door bell circuit
Hi, Have installed a new wired doorbell. (DESA) Heath/Zenith Model #LE-65-B. (Electronic) I also changed and added a new 16 Volt Xfrmer and a lighted pushbutton and a diode. After install, all worked fine including the ""Lighted"" pushbutton. I checked the bell a few hours later, it stopped working and the pushbutton light was off..
stable fm transmitter
There are many techniques to make an FM transmitter stable so it will not change its frequency as the battery runs down. The rf circuit shown below is a mini stable FM transmitter which is using a zener diode to provide accurate voltage to the oscillator while the battery runs down, due to which it will not drift its frequency. The circuit is simp
colpitts osc not working
I`m afraid the circuit you have there is nowhere near correct. For a start, there is no DC path to the transistor base, so no base bias current is available. Q1 collector and emitter are connected directly to the battery with no intervening impedance, so the transistor cannot deliver any useful output. Hmm. ok. so how do I figure out what R1, R2,
Infrared Remote Control Switch
Infrared Remote Control Switch Circuit Remote controls, specially cordless type, are very popular nowadays. Here is a simple and..
relay driver board project
This article means to utilize your old PC to be come a simple controller. Many old PC like 8088 type, 8086, 80286, 80386, or even 80486 already become an obsolete systems. This board using 8-bits of LPT printer parallel data port (DP) to activate the relays. LPT printer parallel port also have 4-bits additional port (PC) which can be utilized too.
pressure sensor circuit
A dance pad, basically 4 pressure sensors (up, down, left, right). I already made the USB controller as a dance pad and whatnot, now I need to know how to hook up the actual sensors. I want the input to be pulled down to ground, so I figured that I would put a rheostat there as a variable resistor for the pulldown. This way, I could adjust how...
the water level control system design of the one-chip computer
In the production field, realize the automatic detection of the water level and control a critical technology that is the industrial process control, have important meanings in the automation level which improves industrial process control. In life field, supplied water the way was generally through realizing control manually in the pasted, apt...
Intercom Circuit for Factories
Power-Off Time Delay Relay circuit
The two circuits illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and the relay is closed when the voltage at the diode anode rises to +12 volts..
Fire Alarm Circuit with Siren Sound
This circuit alerts us when there is a fire accident at home by ringing a siren sound instead of a buzzer. Here we use thermistor to sense the temperature
The first circuit is a simple preamplifier showing the power arangements for conveying DC to the amplifier via the coaxial cable. The second circuit is a small modification so the antenna can still be used for transmitting. The actual preamplifier in this circuit is a practical wideband amplfier that gives about 15 - 20dB of gain from 1. 8 MHz thro
Trimless IF VCO
This paper is a tutorial discussion of IF VCO design considerations. A Colpitts topology is analyzed and used to explore performance impacts..
800w power amplifier mosfet
Using ULN2003 to drive a bipolar stepper motor
Hi all, I,ve built this nice circuit found in Silicon Chip magazine to test my bipolar stepper motor collections. Easy to built and works perfectly..
Si3210 Si3211 Si3212 Hardware Reference Guide
The SI4704 SI4705 enhanced FM receiver is the most advanced portable solution available today offering embedded Antenna support, digital Audio out, worldwide FM band support, and highly flexible, mature, and proven FM functionality in a simple API. The SI4704 SI4705 incorporates Silicon Labs` tuned-resonance Antenna technology for crystal clear FM
Laser Door Alarm Circuit
This laser door alarm is based on the interruption of Laser beam. A low cost Laser pointer is used as the source of light beam. When somebody breaks the la..
transformerless low cost power supply
In Capacitor Power Supplies we use a Voltage Dropping Capacitor in series with the phase line. An ordinary capacitor should not be used in these applications because Mains Spikes may create holes in dielectric of ordinary capacitors and the capacitor will fail to work. This may destroy the device by rushing current from the mains. Thus we use X...
Speed controller circuit change please help
To make your own PWM controller, start with this sawtooth generator. Run it from a 7. 5V regulated supply to make its Vpp 5V. Feed the sawtooth to one input of a comparator and the MAP voltage to the other input of the same comparator. Let the output drive a MosFet transistor. Hi, thanks for the replie, I`ve found this wiring diagram for the sp
Analog 5Gb/s Clock-and-Data Recovery Circuit
A clock-and-data recovery (CDR) circuit is used to both recover the clock from a transmitted data stream and re-time that data with the recovered clock. Such circuits are typically placed at the front-end of receiver chips to recover the clock from data sent from a transmitter chip across a backplane or other channel. This project presents a fully
A Very Simple LED Tester
This simple LED tester consists of a current source with a potentiometer that can be used to adjust the current. The current source is implemented using a type TL081 opamp. The output current of the opamp flows through the diode and R2. The voltage drop across R2 is fed back to the inverting input and compared with the reference voltage, which is
Infrared automatic faucet circuit diagram
The circuit is composed of the parts below: (1) infrared emitterThe multi-harmonic oscillator is comoposed of 555 circuit. The oscillation frequency is decided by value of the RP1, R1, C1. The circuit`s oscillation frequency is 38kHz. (2) infrared receiver circuitThe circuit is composed of infrared receiver tube VD2 and CX20106. (3) water valve con
Shift register sequencer circuit
I was particularly enamored over the mechanics of the Quantized Random Voltage function. The thought occurred to me that, instead of having fixed quantization steps for each output of of the 4006 shift register, it might be fun to actually make the voltages adjustable through pots. The Quantized Random Voltage function uses a pseudo-random...
15-volt power supply regulator
tube amp diagram
ac phase control triacs
This is an application of what`s known as "random fire" technique for full phase control. The term random iskind ofmisleading. Dimming cannot be effected bytriggering the gateindiscriminately;triggering (firing)must be done synchronised with the line frequency. The line frequency is detected by finding the zero-cross, the point where the line volt
clap sensor construction
The clap sensor is a simple circuit that incorporates a PC microphone, a microcontroller, and an output. The following diagram shows the logical circuit design: I chose the ATtiny84 microcontroller for this project because I`m familiar with the AVRarchitecture and Ihave access to the tools to use it. I bought the ATtiny84 in its SOIC-14 packaging.
Using Motor Bridges
Bridges allow your robot to control high current motors. They literally "bridge" between the low-current logic circuitry of your robot`s brain to the high current demanded from the motors. Many, but not all, use the common "H" arrangement of control circuitry (usually power transistors) to provide on/off and directional controls to the motors - h
CAN bus line communication modular design of one-chip computer and MCP2510
CAN Controller Area Network Bus line, namely control device LAN. Because of having high performance, high reliability and unique design, CAN bus line paid attention to more and more by people. Bosch Company of Germany controls and control system design CAN bus line for the car at first, now, its application has already faced fields such as course
up to 100w inverter 12 v to 220vl
how to make solar battery charger
TATUNG T25N440 T32W440 SERVICE ADJUSTMENTS
Self Powered Current Sensing
This is a current sensing circuit that senses the current at the high side (between load and positive supply). This circuit take advantage from..
batteries Li-Poly battery charger with protection Schematic review
When USB present and device needs to work, VSupply is directly provided by the USB and PMOS separates the battery from the supply. (R3 ensures PMOS is on when there is no USB) Primary reason for this is not to disturb the proper charging of the battery. Especially battery is in 2. 5V level, it needs to be trickle charged to 3V and than maximum
Automobile Power WindowCircuitwiring Diagram
Transistor Hartley Oscillator
Any vacuum-tube oscillator configuration has an equivalent transistor circuit. For example, consider the vacuum-tube oscillator, illustrated in Fig. 6-1 (A), which represents one form of Hartley oscillator. Positive feedback is accomplished by arranging the resonant tank E to be common to both the input grid and output plate circuits. The...
Voice changer circuit diagram electronic projects using RTS0072B
This voice changer circuit diagram electronic project is designed using the RTS0072B single chip CMOS LSI designed for voice changer applications, which can transpose or distort one voice into another voice by encoding the input audio signals in normal speed and transmit the output audio signals with unusual speed. Voice changer is accomplished b
The Active Low Pass Filter
Electronics Tutorial about Active Low Pass Filter including Low Pass Filter Frequency Response, Op-amp Voltage Gain and Active Filter Construction..
SPMC65P2408A application in one pair of mic identification directions
The part of the hardware mainly finishes the magnification of sound, when the sound is enough large, have measured on can lead this signal into the one-chip computer ing. The hardware makes up the frame picture and is shown by 1-1. Mainly made up of CPU, analogous circuit and display circuit. The analogous circuit is used in the sound to enlarge,
pt05 diy preamplifier
The next stage is working with the first stage as well it is a fully-complementary. The cascode circuit is also in this place to improve linearity of the amplifiers. Cascode circuit requires a constant reference voltage biasing to make a cascode transistor on. We chose to use a transistor array as a voltage reference. Because it requires less curr
tv remote control jammer
This is a TV Remote Control Jammer circuit. Remote control use modulated light to combat eer infrared nvironment/background infrared noise. Your room heater,..
Lazer Tag Infrared Receivers
So I wasn`t really in the mood of making and coding the timing controller for the PCB laser printer. And I remembered I had this laser tag gun that I took out of optical alignment the last time I took it apart. I figured it wouldn`t be a bad idea to take it apart to do some mods and to fix the alignment again: This is a Nerf (previously Tiger) "La
Replacing Motorola Batteries
These were about $60 a pair with charger and batteries, and have a three-bar battery gauge. With experimentation I found that if the voltage is greater than 4. 28V, all three bars light up. More than 3. 47V, two bars will light up. Below this latter voltage the radio chirps regularly, and only one bar will light up. After a few years use, we...
Charge Pump IC
Audio Level Meter Description A simple and low cost audio level meter circuit that can be used to measure the audio level of your sound source. This circuit is a valuable tool for those who are interested in audio circuits. The circuit is designed with a flat frequency response in the range of 20Hz to 50Khz. Input sensitivity is 100mV for a FSD on
FSK modem with driver for Atari ST or PC
Spot lamp dimmer by LM555 and TIP2955
This circuit is DC Dimmer Circuit. By use IC LM555 be model Astable Multi vibrator. It is can change translate Duty Cycle with fining VR1 and VR2 be..
Dual Relay Driver Board Circuit Schematic
This relay driver boosts the input impedance with a regular BC547 NPN transistor (or equivalent). Very common driver. It can drive a variety of relays, including a reed-relay. Transistor Q1and Q2 are a simple common-emitter amplifier that increases the effective sensitivity of the 12 volt relay coil about a 100 times, or in other words,
PIC16F628 2 Input Alarm Circuit
The program uses the internal 4MHz oscillator PIC16F628 2 Input Alarm Circuit..
You may need a different wiper motor in some cases, rebuilt units are typically available at the parts store for a reasonable cost. Once you have the parts and the manuals, it should be a simple matter of installing the right switch, motor, and (if needed) wiring. If all goes well, things should all fit like they were meant to and the wipers...
Spunky Tube Amplifier
The diagram below shows that power supplies don`t have to be complicated, especially in low-power designs. The filaments are powered directly from the 120 volt AC line, minimising the size of the transformer(s) required to drive the amplifier. Note the slightly unusual series-parallel arrangment; each pair of 35C5 output tube filaments is in...
Hubbell Limit Switch
Engineered Lifting Systems solved a typical crane two blocking problem with circuit limit switches and flux vector drives. ..
WxVoice is an automated voice-back system that uses your PC`s voice modem to speak the current and past weather conditions over the telephone. WxVoice takes advantage of Text-to-Speech (TTS) technology to produce a more natural sounding dialogue than other products that use pre-recorded numbers and phrases. WxVoice is an add-on product to...
This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared by IC2A & IC2B and monitored by LED D4. When D4 illuminates, albeit for a very short peak, I
ADUC845 12MIPS 8052 Flash MCU + 10-Ch 24-Bit ADC + 12-Bit DAC
AH1751 is a single-digital-output Hall-effect Sensor for high temperature operation. The device includes an on-chip Hall voltage generator for magnetic sensing, an Amplifier to amplify Hall voltage, and a Comparator to provide switching hysteresis for noise rejection, and an open-collector output pre-driver. An internal band-gap Regulator is used
Motor Generator Stepper
Stepper motors are a subject that keeps recurring. This little circuit changes a clock signal (from a square wave generator) into signals with a 90-degree phase difference, which are required to drive the stepper motor windings. The price we pay for the simplicity is that the frequency is reduced by a factor of four. This isn`t really a problem, s
Build a Portable AM Radio Transmitter
After we published the original Li`l 7 AM Transmitter plans, fellow experimenter Scott Todd sent us information about his design for a similar portable, battery-powered transmitter. -Original Message- From: Scott Todd Sent: Wednesday, April 12, 2000 8:58 AM To: Walter Heskes Subject: A-1 minicaster I noticed that you have yet to get around
Create a new project by selecting the New Project option from the Getting Started menu or by selecting Select File > New Project. This brings up a Dialog box where you can enter the desired project name and location. Choose a meaningful name. You can also place optional comments for your project in the Description text box. Choose Schematic for th
DIY Solar Tracker System Circuit
When the sun position is changing so does the illumination level on the LDRs and the input voltage for the window comparator is no longer half of the supply voltage thereby the output of the comparator generates informations for the motor that rotates the panels for tracking the sun. P1 and P2 are adjusted in such way that the motor stands still w
This circuit was requested by an school teacher. It is a simple intercom that anyone can put together and get to work. It is based on the LM380 IC chip. T..
Simple Robot That Drives Forward and Back
The Flip-Flop Robot drives forward until it hits an obstacle, and then reverses until it hits another obstacle. This back-and-forth process continues indefinitely. By limiting the functionality to this very rudimentary behavior, it can be generated from an off-the-shelf chip instead of requiring a fancy microcontroller. Thus, this is a good robot
Digital Step-Km Counter
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1 (the least significant digit) sh
A Repeating Timer Circuit
This circuit is based on a simple asymmetric oscillator. The length of time the relay remains energized - and the length of time it remains de-energized - are set independently. With the component values shown in the diagram - both periods are adjustable from about 1 to 30 minutes. The frequency of the Astable Oscillator depends on the value of C1
Inverter Circuit For Soldering Iron
Here is a simple but inexpensive inverter for using a small soldering iron (25W, 35W, etc) In the absence of mains supply. It uses eight transistors and a..
12V 50W Switching Regulator by UC3844N
This is a simple low-cost 50W off-line switching power supply, which can be used for home projects or to learn operation of flyback converters. It can work over a universal AC line input range 90-264 VAC and provides a 12VDC output at more then 4A load. Line and load regulation is better then 0. 5%. The unit has overcurrent, overtemperature and ove
This circuit is based around the PIC 16C84 (or PIC 16F84) microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on it. You have to compile the source code and download the resulting machine code into it, usin
using sg3525 pwm controller explanation