New Circuits Page 127
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This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec. , e. g. when accessing some dark place, without the necessity of coming back to switch-off the lights. Pushing on P1 allows C1 charging to full 12V....
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Wireless IR headphone transmitter. Audio input from PL1 frequency modulates the VCO section of a 4046 PLL chip. The VCO output drives Q1, a switching transistor. Q1 drives two IR LEDs. The...
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A project with circuit on Working with IC555. IC555 is the most versatile chip and it is (can be) used in all most every kind of application because of its multifunctionality. As we know it s on chip multivibrator means with IC555 one can design astable,....
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This power inverter circuit will provide a very stable Square Wave Output Voltage. Frequency of operation is determined by a pot and is normally set to 60 Hz. Various off the shelf transformers can be used. Or Custom wind your own for best results.....
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The Fv-1 has internal circuitry to support an external crystal, preferably a 32768Hz watch crystal. These crystals are extremely inexpensive and widely available. Frequencies other than 32768Hz are available, but not as cheap and not as plentiful. If the....
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This is a design circuit for tone control circuit. This is the figure of the circuit;..The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control in ....
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How to make a Voltage multiplier using dides and capacitors, capable of producing extreem high voltage....
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This simple circuit allows a 12V battery pack to be charged via a bike generator. The generator is rated at 3W and with this voltage multiplier circuit provides about 200mA at about 15km/h. A 12V system was chosen because it allows the use of a car horn (get....
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Atmel`s XMEGA series of microcontrollers are neat little pieces of hardware; with a very fast clock, a ton of IO, USB, and up to 8 UART ports, these neat little chips serve as a nice bridge between AVRs and PICs and the very powerful ARM chips coming out on....
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The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can use ignition...
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50-watt PMS hi-fi amplifier for an 8-ohm load. This circuit delivers about 56 volts peak to peak across an 8-ohm load. Distortion is about 1 % at 20 kHz. The ganged switch at the input is for selecting either disc or FM radio. The input 741 stage is a....
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4027 a dual JK flip flop that has independent clock, set, and reset inputs for each flip flop used in toggle, register, and control functions due to its features such as capability of driving two low power TTL loads, logic edge clocked flip flop design,....
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A teleremote circuit which enables switching on` and off` of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls. The circuit described here can be used....
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PicLink RS232 low cost development controller with ADC PICLink RS232 Embedded Controller The PICLink RS232 controller module affords any microcontroller en....
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DC drive for a Universal motor is shown in figure below. In order to supply DC current to the motor, a diode bridge has been added around the motor. The motor....
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This is anaudioamplifier circuit which use TDA7052 as the main component and other 5 pieces of components to support the main component. The ideal supply voltage of this circuit is about 6-12V and no heatsink required. ..
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An alternating display for my version 1 nixie clock led me to think of new logic designs for switching signals to the display. I took the design of my version 1 nixie clock, tossed out the 4013 flip flop and two 4017 counters, and redesigned the hours....
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This is a three-modes lamp dimmer circuit with touch control. This circuit can be used to control a lamp in 3 operation modes: dim, off, and bright. A NE555....
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Transmitter RF Output LED Indicator Circuit Diagram This RF output detector circuit using a visual indicator can be useful for an RF....
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This acoustic sensor was originally developed for an industrial application (monitoring a siren), but will also find many domestic applications. Note that the sensor is designed with safety of operation as the top priority: this means that if it fails then....
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When we are driving sometimes we do not know the speed of our car, especially when we are in the course of the highway so nice and straight, if the cars speed is too fast or faster than anyone could lead to accidents that do not want to happen. The circuit....
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This is an amplifier circuit using ic LM12 as the main amplifier. This amplifier has a 150Watt power output and has a 4 ohm impedance. These amplifiers have a classified high output power. The frequency response of 10Hz to 30KHz. Supply Voltage at least 9....
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Many fire alarm circuits are presented here, but this time a new circuit using a thermistor and a timer to do the trick. The circuit is as simple and straight forward so that, it can be easily implemented. The thermistor offers a low resistance at high....
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The mechanical chassis prototype, as can be seen from the image on the left, was made using two materials: foam and aluminium. Foam was chosen due to its easy manipulation and aluminium due to its excellent strength to weight ratio. The prototype includes a....
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A field strength meter is a very handy tool for locating a transmitter. A sensitive field strength meter by itself has some limitations, however: It will respond to practically any RF signal that enters its input. This property has the effect of limiting the....
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This surround-sound decoder is based on the "Hafler" principle, first discovered by David Hafler sometime in the early 1970s. The original idea was to connect a pair of speakers as shown in Figure 1, for use as the rear speakers in the surround setup. This....
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This is a walk-through for making and installing a diode kit on a Honda VTX 1800C. This is necessary when you replace incandescent turn signals with LEDs....
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The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit diagram and power....
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If you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be. The high voltage power supplies for the laser tubes are often more expensive then the tubes themselves. This supply can be built with....
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The meaning of Frequency Shift Keying (FSK) is transmitting digital data over a signal path (two wires, telephone lines, AM or FM transmitter). Typically, there are only two signals transmitted. One corresponds to a logical 1 ³. the other to a logical 1 ³.....
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Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal. Voltage controlled oscillators are commonly used in frequency (FM), pulse (PM) modulators....
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This one transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most of the driving current flows through the collector away. Using the values in the audio mi....
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As more than one switches are to be controlled, we have to transmit a number of bits through IR transmission to indicate which is key is pressed on the remote and accordingly which switch of the switch-board to control. In this project, this is done by using....
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Here is a simple yet powerful circuit that can be used for flashing 12V lamps especially that is used on automobiles. The flashing circuit is based on transistor Q1(BC557) and MOSFET Q2 (IRF530) where the Q2 provides the necessary drive for the lamp. Any....
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a miniature version of the classic PONG game. The PONG game was invented back in 1966 by Ralph Baer [1, 2]. In the seventies the game became very popular and I remember that as a child I was completely fascinated by it. We had a later version at home, and on....
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The frequency measurement is one of the most important things in radio construction. Without it you will be unable to set desired frequency in your receiver (and in transmitter too!), without it you will be unable to monitor frequency drifts etc. Sometimes,....
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60MHz Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is extremely useful bench test equipment for testing and measuring frequency of oscillators, transmitters, radio receivers, function generators, crystals, etc.....
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This circuit shows about Remote Control Using Radio Telephone Circuit Diagram. Features: used to switch appliances from any distance, overcoming ....
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Make a little buzzer for my bike to sound occasionally to warn off bears. I have a 12V buzzer from Radio Shack (Cat. No. 273-065) and was wondering if I could run it off of 18V directly (2x9V Transistor Batteries series) for 1-2 second bursts, or if I should....
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Microchip do not recommend any particular circuit for ICSP programming. There are diagrams for different tools, such as Pro Mate and PICKit2 with similar circuitry but slight variations. In some schematics, their suggested resistor values are too small, in....
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Wondered how to control the MR2 Power steering pump so that it is not a noisy power hog because it ’s always on full throttle. Designing some sort of motor controller or using a small off-the-shelf controller would not work for me. One, I ’m not that great....
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Controlled by indoor and outdoor temperature, Simple, high reliability design This circuit is intended to control a heating system or central heating plan....
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This be delay timer circuit model to be simple. It be the character delays to close electric all appliances. By fix the time about 5 minute. It can fine decorate the time. When see the circuit uses digital IC number CD4093 make good easy. And use transistor....
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If you want to build a 10 LED Chaser circuit we suggest this circuit first. It uses popular IC is a simple and affordable IC-4017_decade counter and....
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This is first version of laser diode power supply, and current source using n-channel power device. Component: LM358D IC, Transistor, Resistor, ....
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I2C is pronounced "I squared C" and stands for Inter-Integrated Circuit. This protocol was designed by Phillips Semiconductors around 1992 to allow easy communication between components on the same circuit board and can achieve transfer rates of up to 400....
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The module costs GB38. 00 and the transducer costs a further GB17. 00. In fairness, the Polaroid module does the job it was intended to do, which requires the range, but that job is not to provide the eyes of a small robot. The circuit is designed to be low....
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This kit is based upon an original design by Jan G0BBL and provides a multi-faceted replacement for the older "Rocky" serial interface kit. The kit includes: The control of the programmable Oscillator on the V6. 3 RXTX (and the older, now retired Lite +....
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As shown on the figure 11-6, the fishing circuit consists of timing circuit and audio circuit. 555, RP1 and C1 make up the single shot circuit. The definite time: td=1.1RP1C1. The maximal definite time given by the figure is 15s.IC2 adopts the muisc....
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The objective of this project is to use inexpensive PIR sensor to detect if a human has moved. To build this project I use a PIC18F25K20 microcontroller to detect if the sensor had change state and it will emit a sound from the speaker or piezo, the MCU also....
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Constant Temperature Circuit. (C) G. Forrest Cook 1997 Introduction This circuit is a generic low power temperature controller that can be used for stabilizing temperature...
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One of the more difficult aspects when making a control or security system that uses a PC (a burglar alarm using a PC, for example), is the connection of the sensors to the computer. In addition to typically requiring specialist interface expansion boards,....
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Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set`s aerial input via a cable. Then all that remains to do is tune the....
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The receiving systems used with the scanning type of echo-ranging equipments are of the dual-channel type, which is required in present methods of video portrayal. Deviation indicators, which are cathode-ray tubes or galvanometers, use either a....
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There are two main types: the most common is the Wein Bridge oscillator variety, which has low distortion, but offers only sinewave output and can suffer from amplitude bounce as you change frequency. The type which offers greater versatility of waveform and....
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These Intersil RS-485/RS-422 devices are "fractional" unit load (UL), BiCMOS, 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, this Intersil family is specified for 10%....
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This radio receiver built on a piece of wood uses only 5 transistors but will receive longwave beacons and VLF beacons, depending on the antenna unit connected. Uses our AMVC-384 capacitor and one of our "C" antennas. This page is still under construction as....
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This circuit shows about TDA1054 For Tone Control Stereo Preamp Circuit Diagram. Features: National Semiconductor LM35 IC, use a semiconductor ....
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If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the LED to flash 5 times per second, because the 4017 IC divides the mains....
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This is a simple electronic siren circuit, which can be used in many circuits where the need of siren is required. The circuit is very simple using only two transistors and few other components and it will generate siren sound when power is applied. Use 8....
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This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 - 30MHz with an input sensitivity of greater then 100mV. The probe connects to the PC serial port. So by using the crystal oscillator already present on your PC....
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Circuit diagram is a very simple circuit-level indication, with 10 Led. Used a series of half-wave rectification of precision around IC2 TL071, with a single. LM3915 IC is used to control the led, as an indicator VU Meter. LM3915 can be controlled 10 led.....
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The familiar astable flip-flop circuit is a handy configuration for making flashers or generating squarewaves. Here is a typical alternating LED flasher with the LEDs in the emitters instead of collectors as is normally done. (There is another good reason to....
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This file contains information on tube transconductance. How it is computed and how it is used. It is one of the best descriptions around. It is simple and doesn`t get very deep into the math. It is an old 1940s Bell Labs document written by T. Slonczewski.....
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There are battery powered wireless systems on the market, but the ones I found would signal that the door was open even if you left it open just a few inches for ventilation. I wanted a system that would alert me if we`d just plain forgotten that the door....
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This is a design circuit of a simple inexpensive amplitude stabilized phase shift sine wave oscillator which requires one IC package, three transistors and runs off a single supply. This circuit is combination with the RC network comprises a phase shift....
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Ok, I have been looking for this circuit on line now for a while and I finally found it. (Thank you Kostas 711 in Patras City, Greece. ) Turns out it is a pretty simple circuit. Part of it is a voltage regulator and filter to isolate the voltage supplied by....
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When the input voltage is 198- 242V, the mean value of the load current is 0. 5- 1A, the mean value of the output voltage should keep in 15V, the error is smaller than 5% : 1 When the input voltage is 198- 242V, the mean value of the load current is 0. 5-....
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When designing bass reflex loudspeaker cabinets, it is necessary to measure the resonance of the speaker to an accuracy of about 1%. To do this, you need an audio oscillator and a frequency counter. However, the typical accuracy and resolution of a frequency....
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This page covers several different regenerative receiver circuits that were used in the past, mostly from 1920s to 1940s. Connections are shown with electron tubes (vacuum tubes/valves), but FET transistors can be substituted with little or no changes. To....
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This is the second part of the square root algorithm. It was developed in one month during the final stages of finishing this web site and reviewing this document for publication. While Part I dealt with an empirical discovery for a sequential algorithm to....
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The following circuit shows about Ultrasonic Receiver Sircuit Diagram. Thicircuit based on the CA3140IC. Features: The frequency of sound produced ....
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A series capacitor worked best for low impedance loads while a parallel capacitor was used to feed into high impedance loads. Today`s norm is a 50 ohm antenna antenna/coax system requiring a series capacitor. loading adjustment. With SW3 I can switch out the....
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Gather statistic about the electricity usage at my new house, mainly to see how much using the fireplace lowers the bill. The meter installed by the utility company has a led that blinks at the speed that is relative to the usage. Text on the meter says that....
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Binary Coded Decimal is a number system that only counts from 0 to 9 and then repeats. The table below shows the conversion between the different numbering systems and BCD code. BCD is also called 8421 because the binary LSB counts as a 1, the next bit adds....
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It is sometimes necessary to monitor a device that generates a relatively short pulse to indicate a change of status. If the duration of the input signal is too short, the RFC-1/B may not have time to capture the pulse and respond appropriately. The RFC-1/B....
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The mic`s capsule is believed to be a 32mm OD, 26mm diaphragm design with 3-micron membranes. It is most likely the standard Chinese-made 32mm K67 capsule found in most inexpensive imported condensers...
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The LM1279 is a full featured and low cost Video Amplifier with OSD (On Screen Display). 8V operation for low power and increased reliability. Supplied in a 20-pin DIP package, accommodating very compact designs of the Video channel requiring OSD. All Video....
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Regulating ~12V from the car battery to 5V used by Atmel AVR microcontroller. Why are there two capacitors on each side of linear regulator LM7805 This answer to another question might be the answer I`m looking for, but I`m not sure about it. If this answer....
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The lighting system of a motor vehicle consists of lighting and signalling devices mounted or integrated to the front, sides, rear, and in some cases the top of the vehicle. The purpose of this system is to provideilluminationfor the driver to operate the....
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I have it set up so that I get an out put signal that goes High for about 1/2 second, and then goes low for about 1.33 seconds. The problem is that....
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A 1971 lincoln continental 4dr, i am getting no power inside the car mainly ignition switch, i checked battery cables, post connectors, and fusible link by battery all check out good. all fuses in fuse box good. not sure about the circuit breakers though i....
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This simple Door Chime protects the door and gives a loud Alarm tone when there is an attempt of theft. The circuit is too simple and battery operated. A Normally Closed (NC) reed switch and magnet is used to trigger the circuit. Alarm generator is the....
This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec. , e. g. when accessing some dark place, without the necessity of coming back to switch-off the lights. Pushing on P1 allows C1 charging to full 12V....
Wireless IR headphone transmitter. Audio input from PL1 frequency modulates the VCO section of a 4046 PLL chip. The VCO output drives Q1, a switching transistor. Q1 drives two IR LEDs. The...
A project with circuit on Working with IC555. IC555 is the most versatile chip and it is (can be) used in all most every kind of application because of its multifunctionality. As we know it s on chip multivibrator means with IC555 one can design astable,....
This power inverter circuit will provide a very stable Square Wave Output Voltage. Frequency of operation is determined by a pot and is normally set to 60 Hz. Various off the shelf transformers can be used. Or Custom wind your own for best results.....
The Fv-1 has internal circuitry to support an external crystal, preferably a 32768Hz watch crystal. These crystals are extremely inexpensive and widely available. Frequencies other than 32768Hz are available, but not as cheap and not as plentiful. If the....
This is a design circuit for tone control circuit. This is the figure of the circuit;..The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control in ....
How to make a Voltage multiplier using dides and capacitors, capable of producing extreem high voltage....
This simple circuit allows a 12V battery pack to be charged via a bike generator. The generator is rated at 3W and with this voltage multiplier circuit provides about 200mA at about 15km/h. A 12V system was chosen because it allows the use of a car horn (get....
Atmel`s XMEGA series of microcontrollers are neat little pieces of hardware; with a very fast clock, a ton of IO, USB, and up to 8 UART ports, these neat little chips serve as a nice bridge between AVRs and PICs and the very powerful ARM chips coming out on....
The schematic diagram below show a circuit of high voltage generator. This circuit uses a 4049 hex inverter as an oscillator, and you can use ignition...
50-watt PMS hi-fi amplifier for an 8-ohm load. This circuit delivers about 56 volts peak to peak across an 8-ohm load. Distortion is about 1 % at 20 kHz. The ganged switch at the input is for selecting either disc or FM radio. The input 741 stage is a....
4027 a dual JK flip flop that has independent clock, set, and reset inputs for each flip flop used in toggle, register, and control functions due to its features such as capability of driving two low power TTL loads, logic edge clocked flip flop design,....
A teleremote circuit which enables switching on` and off` of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls. The circuit described here can be used....
PicLink RS232 low cost development controller with ADC PICLink RS232 Embedded Controller The PICLink RS232 controller module affords any microcontroller en....
DC drive for a Universal motor is shown in figure below. In order to supply DC current to the motor, a diode bridge has been added around the motor. The motor....
This is anaudioamplifier circuit which use TDA7052 as the main component and other 5 pieces of components to support the main component. The ideal supply voltage of this circuit is about 6-12V and no heatsink required. ..
An alternating display for my version 1 nixie clock led me to think of new logic designs for switching signals to the display. I took the design of my version 1 nixie clock, tossed out the 4013 flip flop and two 4017 counters, and redesigned the hours....
This is a three-modes lamp dimmer circuit with touch control. This circuit can be used to control a lamp in 3 operation modes: dim, off, and bright. A NE555....
Transmitter RF Output LED Indicator Circuit Diagram This RF output detector circuit using a visual indicator can be useful for an RF....
This acoustic sensor was originally developed for an industrial application (monitoring a siren), but will also find many domestic applications. Note that the sensor is designed with safety of operation as the top priority: this means that if it fails then....
When we are driving sometimes we do not know the speed of our car, especially when we are in the course of the highway so nice and straight, if the cars speed is too fast or faster than anyone could lead to accidents that do not want to happen. The circuit....
This is an amplifier circuit using ic LM12 as the main amplifier. This amplifier has a 150Watt power output and has a 4 ohm impedance. These amplifiers have a classified high output power. The frequency response of 10Hz to 30KHz. Supply Voltage at least 9....
Many fire alarm circuits are presented here, but this time a new circuit using a thermistor and a timer to do the trick. The circuit is as simple and straight forward so that, it can be easily implemented. The thermistor offers a low resistance at high....
The mechanical chassis prototype, as can be seen from the image on the left, was made using two materials: foam and aluminium. Foam was chosen due to its easy manipulation and aluminium due to its excellent strength to weight ratio. The prototype includes a....
A field strength meter is a very handy tool for locating a transmitter. A sensitive field strength meter by itself has some limitations, however: It will respond to practically any RF signal that enters its input. This property has the effect of limiting the....
This surround-sound decoder is based on the "Hafler" principle, first discovered by David Hafler sometime in the early 1970s. The original idea was to connect a pair of speakers as shown in Figure 1, for use as the rear speakers in the surround setup. This....
This is a walk-through for making and installing a diode kit on a Honda VTX 1800C. This is necessary when you replace incandescent turn signals with LEDs....
The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit diagram and power....
If you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be. The high voltage power supplies for the laser tubes are often more expensive then the tubes themselves. This supply can be built with....
The meaning of Frequency Shift Keying (FSK) is transmitting digital data over a signal path (two wires, telephone lines, AM or FM transmitter). Typically, there are only two signals transmitted. One corresponds to a logical 1 ³. the other to a logical 1 ³.....
Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal. Voltage controlled oscillators are commonly used in frequency (FM), pulse (PM) modulators....
This one transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most of the driving current flows through the collector away. Using the values in the audio mi....
As more than one switches are to be controlled, we have to transmit a number of bits through IR transmission to indicate which is key is pressed on the remote and accordingly which switch of the switch-board to control. In this project, this is done by using....
Here is a simple yet powerful circuit that can be used for flashing 12V lamps especially that is used on automobiles. The flashing circuit is based on transistor Q1(BC557) and MOSFET Q2 (IRF530) where the Q2 provides the necessary drive for the lamp. Any....
a miniature version of the classic PONG game. The PONG game was invented back in 1966 by Ralph Baer [1, 2]. In the seventies the game became very popular and I remember that as a child I was completely fascinated by it. We had a later version at home, and on....
The frequency measurement is one of the most important things in radio construction. Without it you will be unable to set desired frequency in your receiver (and in transmitter too!), without it you will be unable to monitor frequency drifts etc. Sometimes,....
60MHz Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is extremely useful bench test equipment for testing and measuring frequency of oscillators, transmitters, radio receivers, function generators, crystals, etc.....
This circuit shows about Remote Control Using Radio Telephone Circuit Diagram. Features: used to switch appliances from any distance, overcoming ....
Make a little buzzer for my bike to sound occasionally to warn off bears. I have a 12V buzzer from Radio Shack (Cat. No. 273-065) and was wondering if I could run it off of 18V directly (2x9V Transistor Batteries series) for 1-2 second bursts, or if I should....
Microchip do not recommend any particular circuit for ICSP programming. There are diagrams for different tools, such as Pro Mate and PICKit2 with similar circuitry but slight variations. In some schematics, their suggested resistor values are too small, in....
Wondered how to control the MR2 Power steering pump so that it is not a noisy power hog because it ’s always on full throttle. Designing some sort of motor controller or using a small off-the-shelf controller would not work for me. One, I ’m not that great....
Controlled by indoor and outdoor temperature, Simple, high reliability design This circuit is intended to control a heating system or central heating plan....
This be delay timer circuit model to be simple. It be the character delays to close electric all appliances. By fix the time about 5 minute. It can fine decorate the time. When see the circuit uses digital IC number CD4093 make good easy. And use transistor....
If you want to build a 10 LED Chaser circuit we suggest this circuit first. It uses popular IC is a simple and affordable IC-4017_decade counter and....
This is first version of laser diode power supply, and current source using n-channel power device. Component: LM358D IC, Transistor, Resistor, ....
I2C is pronounced "I squared C" and stands for Inter-Integrated Circuit. This protocol was designed by Phillips Semiconductors around 1992 to allow easy communication between components on the same circuit board and can achieve transfer rates of up to 400....
The module costs GB38. 00 and the transducer costs a further GB17. 00. In fairness, the Polaroid module does the job it was intended to do, which requires the range, but that job is not to provide the eyes of a small robot. The circuit is designed to be low....
This kit is based upon an original design by Jan G0BBL and provides a multi-faceted replacement for the older "Rocky" serial interface kit. The kit includes: The control of the programmable Oscillator on the V6. 3 RXTX (and the older, now retired Lite +....
As shown on the figure 11-6, the fishing circuit consists of timing circuit and audio circuit. 555, RP1 and C1 make up the single shot circuit. The definite time: td=1.1RP1C1. The maximal definite time given by the figure is 15s.IC2 adopts the muisc....
The objective of this project is to use inexpensive PIR sensor to detect if a human has moved. To build this project I use a PIC18F25K20 microcontroller to detect if the sensor had change state and it will emit a sound from the speaker or piezo, the MCU also....
Constant Temperature Circuit. (C) G. Forrest Cook 1997 Introduction This circuit is a generic low power temperature controller that can be used for stabilizing temperature...
One of the more difficult aspects when making a control or security system that uses a PC (a burglar alarm using a PC, for example), is the connection of the sensors to the computer. In addition to typically requiring specialist interface expansion boards,....
Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set`s aerial input via a cable. Then all that remains to do is tune the....
The receiving systems used with the scanning type of echo-ranging equipments are of the dual-channel type, which is required in present methods of video portrayal. Deviation indicators, which are cathode-ray tubes or galvanometers, use either a....
There are two main types: the most common is the Wein Bridge oscillator variety, which has low distortion, but offers only sinewave output and can suffer from amplitude bounce as you change frequency. The type which offers greater versatility of waveform and....
These Intersil RS-485/RS-422 devices are "fractional" unit load (UL), BiCMOS, 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, this Intersil family is specified for 10%....
This radio receiver built on a piece of wood uses only 5 transistors but will receive longwave beacons and VLF beacons, depending on the antenna unit connected. Uses our AMVC-384 capacitor and one of our "C" antennas. This page is still under construction as....
This circuit shows about TDA1054 For Tone Control Stereo Preamp Circuit Diagram. Features: National Semiconductor LM35 IC, use a semiconductor ....
If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter, and causes the LED to flash 5 times per second, because the 4017 IC divides the mains....
This is a simple electronic siren circuit, which can be used in many circuits where the need of siren is required. The circuit is very simple using only two transistors and few other components and it will generate siren sound when power is applied. Use 8....
This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 - 30MHz with an input sensitivity of greater then 100mV. The probe connects to the PC serial port. So by using the crystal oscillator already present on your PC....
Circuit diagram is a very simple circuit-level indication, with 10 Led. Used a series of half-wave rectification of precision around IC2 TL071, with a single. LM3915 IC is used to control the led, as an indicator VU Meter. LM3915 can be controlled 10 led.....
The familiar astable flip-flop circuit is a handy configuration for making flashers or generating squarewaves. Here is a typical alternating LED flasher with the LEDs in the emitters instead of collectors as is normally done. (There is another good reason to....
This file contains information on tube transconductance. How it is computed and how it is used. It is one of the best descriptions around. It is simple and doesn`t get very deep into the math. It is an old 1940s Bell Labs document written by T. Slonczewski.....
There are battery powered wireless systems on the market, but the ones I found would signal that the door was open even if you left it open just a few inches for ventilation. I wanted a system that would alert me if we`d just plain forgotten that the door....
This is a design circuit of a simple inexpensive amplitude stabilized phase shift sine wave oscillator which requires one IC package, three transistors and runs off a single supply. This circuit is combination with the RC network comprises a phase shift....
Ok, I have been looking for this circuit on line now for a while and I finally found it. (Thank you Kostas 711 in Patras City, Greece. ) Turns out it is a pretty simple circuit. Part of it is a voltage regulator and filter to isolate the voltage supplied by....
When the input voltage is 198- 242V, the mean value of the load current is 0. 5- 1A, the mean value of the output voltage should keep in 15V, the error is smaller than 5% : 1 When the input voltage is 198- 242V, the mean value of the load current is 0. 5-....
When designing bass reflex loudspeaker cabinets, it is necessary to measure the resonance of the speaker to an accuracy of about 1%. To do this, you need an audio oscillator and a frequency counter. However, the typical accuracy and resolution of a frequency....
This page covers several different regenerative receiver circuits that were used in the past, mostly from 1920s to 1940s. Connections are shown with electron tubes (vacuum tubes/valves), but FET transistors can be substituted with little or no changes. To....
This is the second part of the square root algorithm. It was developed in one month during the final stages of finishing this web site and reviewing this document for publication. While Part I dealt with an empirical discovery for a sequential algorithm to....
The following circuit shows about Ultrasonic Receiver Sircuit Diagram. Thicircuit based on the CA3140IC. Features: The frequency of sound produced ....
A series capacitor worked best for low impedance loads while a parallel capacitor was used to feed into high impedance loads. Today`s norm is a 50 ohm antenna antenna/coax system requiring a series capacitor. loading adjustment. With SW3 I can switch out the....
Gather statistic about the electricity usage at my new house, mainly to see how much using the fireplace lowers the bill. The meter installed by the utility company has a led that blinks at the speed that is relative to the usage. Text on the meter says that....
Binary Coded Decimal is a number system that only counts from 0 to 9 and then repeats. The table below shows the conversion between the different numbering systems and BCD code. BCD is also called 8421 because the binary LSB counts as a 1, the next bit adds....
It is sometimes necessary to monitor a device that generates a relatively short pulse to indicate a change of status. If the duration of the input signal is too short, the RFC-1/B may not have time to capture the pulse and respond appropriately. The RFC-1/B....
The mic`s capsule is believed to be a 32mm OD, 26mm diaphragm design with 3-micron membranes. It is most likely the standard Chinese-made 32mm K67 capsule found in most inexpensive imported condensers...
The LM1279 is a full featured and low cost Video Amplifier with OSD (On Screen Display). 8V operation for low power and increased reliability. Supplied in a 20-pin DIP package, accommodating very compact designs of the Video channel requiring OSD. All Video....
Regulating ~12V from the car battery to 5V used by Atmel AVR microcontroller. Why are there two capacitors on each side of linear regulator LM7805 This answer to another question might be the answer I`m looking for, but I`m not sure about it. If this answer....
The lighting system of a motor vehicle consists of lighting and signalling devices mounted or integrated to the front, sides, rear, and in some cases the top of the vehicle. The purpose of this system is to provideilluminationfor the driver to operate the....
I have it set up so that I get an out put signal that goes High for about 1/2 second, and then goes low for about 1.33 seconds. The problem is that....
A 1971 lincoln continental 4dr, i am getting no power inside the car mainly ignition switch, i checked battery cables, post connectors, and fusible link by battery all check out good. all fuses in fuse box good. not sure about the circuit breakers though i....
This simple Door Chime protects the door and gives a loud Alarm tone when there is an attempt of theft. The circuit is too simple and battery operated. A Normally Closed (NC) reed switch and magnet is used to trigger the circuit. Alarm generator is the....
