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 12
ITU-R 468 noise weighting
ITU-R 468 is a standard relating to noise measurement, widely used when measuring noise in audio systems. The standard defines a weighting filter curve, together with a quasi-peak rectifier having special characteristics as defined by specified tone-burst tests. It is currently maintained by the International Telecommunications Union who took it...
make this simple digital voltmeter
The post explains a very simple digital panel type voltmeter circuit using a single IC L7107 and a few other ordinarycomponents. The circuit is able to measure voltages right up to 2000 AC/DC V. Making this simple digital panel voltmeter circuit is particularly easy due to the availability of the A/D voltage processor chip in the form of IC L7
Bus / Register Tutorial
Since you will be required to use buses and registers in lab 4, we will make a macro for a register that uses a 4bit bus for the data input and a 4-bit bus for the data output. You will need to make a similar macro for all your components that uses buses, so this will be a good jumping off point Single click at the point where you want the bus to
USBStickLogger - USB thumb drive logger for serial data - fischl.de
Default setting for the UART is 9600 baud, 1 start bit, 1 stop bit, no parity. You can configure this paramter by placing the file "CONFIG. TXT" to the USB thumb drive. Currently only the baudrate can be configured. Example: Once the device is connected and correctly configured, all incoming characters on the serial interface are written to the fi
Tl5001 Pulse-width-modulation (pwm) Controller Coupled With A Tps2817 Mosfet Driver
H-Bridge and Half Bridge Driver IC TLE6282G Application, Dedicated for DC-brush high current motor bridges in PWM control mode and adapted for use in injector and valve applications for 12, 24 and 42V powernet applications. Useable as four fold lowside driver for unipolar 4 phase motor drives. , The two half bridges CAN operate independently. The
18 watt power amplifier using tle2141c
This is a circuit schematic diagram power amplifier, the power amplifier circuit diagram using the IC TLE2141C. This power amplifier is TLE2141C IC IC type Low noise, high voltage, high-slew-rate op-amps. Frequency response 30Hz to 20KHz-1dB. You can connect directly with a CD player, tuner and tape recorder. Circuit diagram for voltage requires 2
555 timer based light seeking robot
The schematic diagram of this robot is very simple to understand. As I had mentioned earlier I just modified a circuit from on of the books to create..
vhf rf preamp 100 175 mhz with max2633
This is the diagram of VHF RF Preamp circuit 100-175 MHz with single chip MAX2633. The circuit can be used for the entire VHF broadcast and PMR band (100-175 MHz) which can be easily construct without any special test equipment. The grounded-gate configuration is inherently stable without any neutralization if appropriate PCB layout techniques are
remote control circuit
This is a universal remote control I built. The entire thing was programmed with just 1KBof memory, and works with TV`s using the RC 5, RC 80, and NEC protocols (most TV`s). Its effective range is about 40m, and is effective at angles up to 60 degrees. I began by using ExpressSCH to lay out a schematic of the circuit required to power the micropro
RC Coupled Amplifier Training
battery low voltage buzzer
8-Way MIDI Drum Pads
Have you got rhythm Do you want to transfer that rhythm to your computer or hardware sequencer Probably the easiest way of achieving this is to use MIDI drum pads that can be hit with drumsticks, and the data can be stored in real time with any errors corrected afterwards. I previously designed a MIDI drum pad system with the velocity byte fixed...
Arduino FM radio receiver shield
This Instructable will show you how to build your own FM radio receiver shield to be used with an Arduino board. The radio chip we are going to be using is the AR1010 on a breakoutboard found at Sparkfun or Electrokit and there will be code to get you up and running provided later on. We are going to use an laser cutter for the shield...
lantern dimmer flasher circuit diagram
The electronic lantern control circuit adds high-efficiency dimming and flashing to an existing battery powered lantern orflashlight or to a custom design. For the car it makes a great lamp for changing a flat tire, back seat reading or emergencyengine work. The flasher mode is useful for warning other drivers of your troubles and it may be adjust
ME218A: Soccer Pinball scoreboard
The diagram below illustrates the high level connections required to drive a single 7-segment display on the scoreboard. The below circuit was repeated 4 times - once for each of the four 7-segment LED displays. Each circuit takes a single data line as its input (C32 outputs T4-T7), and uses a shared clock signal (C32 output T3) that is common to
IR On/Off Switch Using Microcontroller
Turn ON or OFF electrical devices using remote control is not a new idea and you can find so many different devices doing that very well. For realization of this type of device, you must make a receiver, a transmitter and understand their way of communication. Here you will have a chance to make that device, but you will need to make only the rece
Nokia 7610 MMC Corrupt Problem Picture Help
MMC corrupt can be caused by damaged MMC or damaged memory card driver. On the Nokia 7610, there is a memory card regulator, it is an integrated circuit and the location is near the memory card connector. Nokia 7610 memory card corrupt can be caused by damaged this regulator. To repair the problem, we can replace the regulator with the new one, o
Simple Transistor Amplifier Circuit Schematic and Explanation
This circuit doesn`t work as well as it could. I made it when I had a lesser understanding of circuit design. I`ll probably make a new and improved schematic and post later on, one that has a better design. Thanks for stopping by! Note: The schematic here says antenna , but that`s because it was used specifically to amplify electrical noise in t
latest Wailing Alarm Siren circuit Schematic with explanation
Browse » home » alarm » circuit » explanation » latest » schematic » siren » wailing » with » latest Wailing Alarm Siren circuit Schematic with explanation *The Loudspeaker LS and the resistor marked Rx should be together 75 ohms. If you have a standard 8-ohm speaker then Rx is 67 ohms. The nearest value is 68 ohms. So for a 8 ohm lou
Power-On Time Delay Relay circuit
Here`s a power-on time delay relay circuit that takes advantage of the emitter/base breakdown voltage of an ordinary bi-polar transistor. The reverse connected emitter/base junction of a 2N3904 transistor is used as an 8 volt zener diode which creates a higher turn-on voltage for the Darlington connected transistor pair..
220V Touch Switch circuit diagram
This circuit is connected directly to a 220V home electrical installations. LOAD on the schematic diagram above, is an electronic device with 220V AC current consumption.
TDA1083 Am radio receiver circuit diagram electronic project
This Am radio receiver circuit is based on the TDA1083 radio IC that can be used to build a simple MF band radio. This AM radio schematic circuit based on the TDA1083 will work in 300kHz 3MHz frequency range. This AM radio receiver circuit is very simple and require few external components. Using the TDA1083 we can make a AM FM radio receiv
5 Minute Signal
For the past year and a half I (Mark) have been part of an Ann Arbor, Michigan based group named GO-Tech. The common thread among the group members is that each of us is interested in making things using technology (combining hardware, software, metal, wood, etc. ). I refer to it as Do It Yourself Tech (DIYTech). The group meets monthly to pres
light flasher/blinker circuit diagram
With the preset at its max. the flashing rate of the LED is about 1/2 a second. It can be increased by increasing the value of the capacitor from 10uF to a higher value. For example if it is increased to 22uF the flashing rate becomes 1 second. There is also provision to convert it into an alternating flasher. You just have to connect a LED and a
6 volt power supply regulator
DC to AC Inverter - 12V to 110V/120V Inverter
Here is a simple 12 volts DC to AC inverter circuit. This 120V AC power source is built with a simple 120V:24V or 110V:24V center-tapped control transforme..
DOOR AJAR MONITOR
The monitor senses an ajar door and, if the situation isn`t corrected within 20 seconds, sounds a beeping alarm. The circuit is controlled by a magnetic reed switch and magnet on the door. With the door closed, the switch is closed and the alarm is disarmed. Opening the door opens switch, C1 starts charging up through R1. Approximately 20...
Dimmable Fluorescent Lights Bulbs
The brightness of a fluorescent light bulb or neon tube cannot adjust as easily as that of a incandescent bulb because it starts only when a voltage is much higher than that of the network, then remains on at electrical network voltage. Normally, the high starting voltage is obtained by the interruption of current that circulates through a choke c
Ponyprog Circuit for ATMEL AVRs
On board the AVRs that can be programmed are those in the schematic. For other members of AVR family or the rest programmable ICs that Ponyprog can program, there is the J1 connector (CON10) which allows expanding the programmer`s hardware. See Ponyprog`s site for other`s ICs Ponyprog circuits. The JUMP1 jumper is there to connect the crystal`s
frequency meter circuit
ir music transmitter and receiver
Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitter and receiver. The IR music transmitter works off a 9V battery, while the IR music receiver works off regulated 9V to 12V. First diagram shows the circuit of the IR music transmitter. It...
matrix keypad pic mikroc library
It initializes a particular port for working with keypad. A global variable keypad Port must be defined before using this function. Port need to be initialized before calling this function. This function reads key when a key is pressed and it returnsnumber corresponding (1 16) to the pressed key. If no key is pressed, it will return 0. When this...
1 Hz Pulse Frequency Generator with 555
A 1Hz pulse/frequency generator using the popular timer IC 555 which is wired as an Astable Multivibrator. The output pulses can be indicated visually by the LED. An Astable Multivibrator, often called a free-running Multivibrator, is a rectangular-wave generating circuit. Unlike the Monostable Multivibrator, this circuit does not require
10 Mhz QRSS Beacon
My beacon is using now a simple CW keying QRSS3 10140. 020 khz, power is 20 milliwatt. I`m using a PIC program PicBeacon di Ik2pcb. Click here for the reception report The idea of making this beacon start from two project, one is the Hans G0GPL QRSS Junkbox Beacon and the other is the simple "2 transistor" project from Colin G6AVK. Using
Using microcontroller as oscillator for high voltage power suppy
Using the 555 timer as an oscillator in the high voltage power supply section. Can the design be changed to use an output from the micro-controller to generate an oscillating signal instead of the 555. The first question is that would such a design work If it works, is there a particular reason why a 555 timer is used in the design
home telephone fm transmitter circuit
This circuit connects in series with your home phone line and delivers the phone conversation through the FM band any time you pick up the telephone handset. Transmitted signal could be tuned by any FM receiver. The circuit features an "On Air" LED indicator and also gives you a switch t
L297/298 Stepper Motor Controller
A better way to make a stepper motor controller is to make a printed circuit board, and then simply drop the components in. After making the PCB, placing the components and soldering them hardly takes any time at all, in contrast to the proto board which took a ton of time to make. Here`s a picture of the first stepper motor controller I made in...
cheap frequency counter
This frequency counter uses your existing digital multimeter as the display unit that is why it can be constructed at very low cost. Due to the high impedance of most DMMs, a frequency to voltage converter can be easily connected to it without matching problems. The converter shown in the diagram has a frequency range of 10 Hz up to 1 kHz (positio
Vary the Volume of a Buzzer
This is a pretty simple project we are going to do. We are going to create a simple buzzer circuit where we can increase or decrease the volume of the sound that the buzzer outputs. Okay, now we can do this in two ways. We can first turn the potentiometer all the way to the side where it gives out almost 0G of resistance. When we start at near
power amplifier An amplifier designed to deliver maximum power output to a load. Example: In an audio system, it is the ..
hv neon lamp multivibrator
This unusual, simple multi-vibrator has only five components and uses neither vacuum tubes nor semiconductors but two miniature NE2 type neon lamps. This circuit interfaces best with vacuum tube or FET type high-impedance circuits. Almost any type of neon bulbs would work fine in this circuit not just the NE2 type but they have to be in their...
7 Watt Class B Audio Amplifier Circuit
This is a design circuit for amplifier was designed in order to fill the gap in the 3-10 Watts power output range of the audio amplifiers available on RED Free Circuit Designs. Therefore a simple, very low parts-count amplifier, was designed on the same guidelines of the successful 45 Watt Class B Amplifier, but using the excellent NE5534 IC inste
stereo ir audio receiver
Troubleshooting a Triac Motor Control Circuit
Even thought the power was off there was AC at the handle plug and I shorted something. I pulled it apart and found a transistor blown apart. I figured it would be an easy fix. One month, twenty plus dollars in parts and many changes of components it is still not working correctly. The problem is on the right side, the handle with the solder...
The circuit is based on the 555 timer, connected as a PWM generator. Again i will use as output the discharging capacitor from pin 7, which will control the base of the power transistor. Similar to the LED Off Delay with dimming effect circuit, i wil. Read more A Photo resistor changes its resist value depending on how much light shines on its top
temperature controlled switch
It sounds rather mysterious: a switch that is controlled by its ambient temperature. All without the touch of a human hand, except for when you re building this sort of electronic thermostat. There are a lot of handy uses for a thermally controlled switch. If the temperature inside your PC gets too high sometimes, the circuit can switch on an...
A hifi preamplifier designed to convert high output impedance amplifiers to 600 ohm outputs..
Water Level controller
The Microcontroller based Water Level Controller cum Motor Protector controls on and off conditions of the motor depending upon the level of water in the over head tank (OHT), It controls water level of tank through micro-controller so that automatically protect the motor. ","0",
phone cut circuit
A while ago I got an email asking for the schematic of a circuit to detect cut phone lines. It didn`t take me long to find this circuit in Electronics Now. When the circuit detects that a phone line has been cut, it activates a MOSFET which can be used to drive a relay, motor, etc. It can also be connected to a security system. If the circuit is
Door lock Motor
The measured resistance of door lock motor was about 2 ohm. Therefore, supplying 5V, the current becomes 5v/2ohm= 2. 5A. Regarding that the peak output current of L293B is 2A, the current flowing inside the motor is slightly over 2A, but it does not occur any problem because the motor will be used just for several seconds. Voltage regulator (LM7805
Battery charger circuit using L200
A very simple battery charger circuit having reverse polarity indication is shown here. The circuit is based on IC L200. L200 is a five pin variable voltage voltage regulator IC. The charging circuit can be fed by the DC voltage from a bridge rectifier or center tapped rectifier. Here the IC L200 keeps the charging voltage constant. The charging...
SP6336 SP6336 -Triple Micropower Supervisory Circuit With Watchdog And Power Fail
Introduction The SP6648 integrated synchronous boost Regulator is a compact circuit that provides a ultra- high efficiency drive current for an LED flashlight using a LuxeonTM I light source. The circuit shown below is configured to provide 350mA constant output current for a two cell alkaline battery application. All components are compact surfac
555 Capacitor Tolerance Adjustment circuit
The 555 Timer shown below is configured as an 555 Astable Multivibrator previously discussed. However additional components have been added to enhance the operation of the circuit. As soon as the circuit is powered up the 555 will begin producing a square wave determined by the value of Capacitor C1 and Resistors R1 and R2, as determined by the ti
Atari Joystick Wired Remote Control for Robots
The simplest solution for implementing joystick control for a robot would be to program the actions in software in a microcontroller. But, since many readers prefer off-the-shelf parts, this circuit is going to be made with diodes, resistors, transistors, and one FAN8200 motor driver chip. The downside is that the circuit is more complex. D10: A S
Philadelphia Wireless Training Institute 1947 Receiver
Assemble the AVR Tiny MIcrocontroller Circuit
Wire the circuit diagram shown here on a bread board. The choice of V type of AVR is important. For example Tiny13V is very appropriate for such an ex..
audio peak indicator
A peak level indicator when a signal exceeds a certain maximum value. It can be quite useful, for instance, with tape recorders, mixing consoles etc. One of the most important requirements of a peak level indicator is that it should respond to very short signals..
gated pulse descrambler
This circuit consists of an amplifier and video detector with a second subcarrier detector for synch recovery purposes. A pulse-former circuit modulates the gain of the main channel increasing it during synch intervals.
eliminate wasted phantom power
Most Apple and Windows PCs can be put to "sleep" or "standby" mode while not in use rather than shutting them down completely. This mode has the advantage thatwhen they wake from sleep via keyboard or mouse activation, the operating systemrestores all previous work sessions within seconds. There is no need to restart the computer and then reopen...
Simple Alarm Circuit Keeps Wandering Children
The receiver circuit in Figure 1 sounds an audio alarm when the transmitter (Figure 2) moves beyond a designated perimeter. The transmitter, a voltage-controlled oscillator, operates at approximately 915 MHz in the unlicensed ISM (industrial/scientific/medical) band. It has a tuning voltage of 1. 5V=3G—R2/(R1+R2), which lets you easily adjust the f
Activ Loop Antennas
Multimedia RIAA Preamplifier
Even if a large number of album titles once available on vinyl are now, little by little, being proposed as CDs, not all are available and far from it. You may have treasures in your collection that you would like to burn on CDs. First, preserving a CD is easier than preserving a vinyl record, and second, we have to admit that turntables are disap
35w audio amplifier circuit by stk082
This amplifier circuit is suitable for home power audio devices. The STK082 amplifier specifications might lead you to believe that it can use supply voltages of up to ±43V. but I don`t recommend anything greater than ±25V if 8 ohm loads are expected, although ±30V will be fine if you can provide good heatsinking.
s1d13700 arduino documentation
The provided connections will provide configuration free usage for most Arduino boards. Some Arduino boards, such as the Mega2560, will require custom configuration. This is determined by how the ports on the Atmel AVR microcontroller are mapped to the digital pins as broken out on your Arduino board. Most Arduino boards, including the Uno,...
doorbell of two tones
SW Receiver Using ZN414
The problem with amplifying weak radio signals is that you also amplify the noise. What you can receive depends on how much background noise is present, whether it be man made interference or static. In this design the RF signal is first met by a resistive attenuator, this is necessary as strong signals could otherwise overload your receiver. The
5W Audio Amplifier Circuit based BD139/BD140
The following is the diagram of 5W audio amplifier circuit which built using power transistor BD139 and BD140 as the final gaining process. This small amplifier can be used as general purpose amplifier such as computer amplifier, radio, mp3 player, video player, etc. The input stage consists of Q1 through Q5 and 3 diodes. The differential pair is
Project choice for KT88
I plan on building a ""high power"" amp using the KT88. Found the following circuits: 1) Which will be the better quality one to build? 2) Are ..
Implementing An Ultralow-power Thermostat With Slope A/d Conversion
The A3425 is a dualoutput-channel, bipolar Switch with each channel comprising a separate complete Hall-effect Sensor circuit with dedicated Hall element and separate digital output for speed and direction signal processing capability. The independent Hall elements (E1 integrated with OUTPUTA, and E2 integrated with OUTPUTB) are photolithographica
Electronics cricket game circuit shown in this website is very simple and easy to build circuit diagram of electronics cricket project various game project .
tv memory program using at24c0 24c02n
switches Can I achieve a one shot button without a 555
A relay, which is energised by pulling the low side low using an NPN. I would like a pushbutton to operate the transistor (and therefore the relay) for a time (500ms ish) then deactivate it and wait for the next push (ignoring the button if held). I understand how I can achieve this using timers (or a MCU), but I was hoping there might be a more...
Simple Audio Amplifier
TDA8340 Television If Amplifier And Demodulator - Nxp Semiconductors
The TDA9813T is an integrated circuit for vision IF signal processing and sound dual FM demodulation, with single reference QSS-IF in TV and VCR sets. For negative modulation standards only.