Popular Circuits Page 144
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Introduction to circuit schematic of the circuit shown in Figure 3-3. Here the 555 connected as a one-shot form, usually in a normally open push button switch..
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This circuit does not require an output transformer or an output coupling capacitor; the annunciator can easily be turned on or off by a control input voltage driving a 10Mohm input resistor, R3. For a smaller acoustic output, replace output transistor Ql,....
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This circuit based on ATtiny26 but it could be anyone microcontroller of AVR family. Produce stable one MIDI tone and you can change it by press some keys like to change midi channel 0-15 , velocity 0-127, pitch 0-127. It is start from center tone (C) at....
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This page documents an older version of the project that proved very unreliable. This is (still) an ongoing project when I get free time, so I post periodic updates here until I get a proper design/rig and eventually create a new page for it (with pictures....
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Cheap, simple, and accurate thermostat circuits with instructions....
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This supply generates an initial high voltage for ignition purposes. After ignition, the supply generates about 1300 to 1500 V. If a higher ignition voltage (than the 6000 V supplied) is necessary,..
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While cleaning up my computer files I stumbled over this schematic, which I used in the early stage of the USB LED Matrix development, and I thought it might be usefull to others. ..
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This is a design circuit for stereo encoder. This circuit is using BH1417 Stereo Encoder. This circuit using with pre-emphasis, limiter so that the music can be transmitted at the same audio level, low pass filter that blocks any audio signals above 15 KHz....
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This current source has continuous control of the magnitude and polarity of its amplifier gain and needs only one voltage reference. The circuit includes reference ~, voltage-amplifier circuit A1 with gainsetting resistor Rs, and bootstrap-follower....
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The common characteristic of all of the previous low power FM transmitters I`ve built over the decades, is that their operating frequency is determined by an LC resonant circuit. ..
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Video Power amplifier circuit diagram. The scheme works only when using the compounds of AV where video and audio signals are sent separately. Not suitable for joints «HF » antenna cable. Make sure to include the video amplifier in the line of the video,....
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The stoboscope tube needs about 250-400V DC to operate. This aerial voltage is generated application simple voltage footfall up ambit congenital from transistors Q1, Q2 and agent T1. This ambit gives out about 230V AC voltage which is again rectified with....
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Can anybody tell me if the output of a monostable 555 timer circuit can be used to trigger another similar timer circuit. I have shown my idea with a....
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These two headlight reminder circuits are easy to install and operate on the KISS (Keep It Simple Stupid) principle. The simple circuit involves adding just a 12V piezo buzzer between the lights circuit and a door switch. The buzzer sounds if the lights are....
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The circuit of Figure 1 produces an accurate, variable-frequency sine wave for use as a general-purpose reference signal. It includes an eighth-order elliptic, switched-capacitor lowpass filter, IC3, which uses a 100-kHz square-wave clock signal that....
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Each issue a specific frequency of sound, audio remote control will switch changes state, the circuit for other frequencies emitted by the environment sound with strong anti-in..
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These circuits allow an ON-ON type DPDT toggle switch to control a twin coil switch machine motor. The handle of switch can then be used to indicate the route selected. The circuits are also able to control LEDs that could be used to indicate the selected....
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A nice and compact setup, that works off-line, directly at 220V, with only a voltage doubler to get the plate voltage up to 560V DC. I don`t need to go into details explaining this circuit, it is a simple Armstrong oscillator, using the feedback coil L4.....
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This part of the I2C interfacing project focuses on building an acceleration sensor, but in the process it also explores two other issues: advanced use of the PCF8591 chip (that we have already seen in the pressure sensor) and running the bus at 3. 3v. For....
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Before applying power, check for shorts on the board. This design runs from a FIVE volt supply, connecting it directly to a 12 volt supply will kill it for certain. The current drawn is very small, in the region of 70mA so connect a small 5V regulator in....
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The CA3189 IC integrates a symmetrical limiter, a phase demodulator, an audio amplifier, and a logarithmic detector-amplifier. The logarithmic detector-amplifier is the most interesting part of the IC for the above featured circuit. It can be used to enhance....
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A few months ago, I decided to build a compact, yet effective alarm. My demands were:- simple construction, reliable operation, very small power consumption, and, most of all, small size. I started with CMOS logic gates, but was soon forced to abandon the....
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This circuit is intended to provide good square waves converting a sine wave picked-up from an existing generator. Its main feature consists in the fact that no power-source is needed: thus it can be simply connected between a sine wave generator and the....
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Any time base circuit 555, the internal structure of the same circuit, the performance is the same. When there are many manufacturers base circuit 555 models, such as MC555, CA..
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over 1400 top electronics projects and electronic circuits with photos, datasheets and easy to read schematics plus how it works and how to build it ..
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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 C8, preventing the voltage supply to be conveyed into loudspeakers in....
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A project of a morning / sunrise alarm circuit which will produce a beep-beep alarm sound and flashes an LED according to the sunlight....
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Here is the circuit diagram of a simple 3 band graphic equalizer circuit using a single IC and few components. The IC used here is LF 351 which is a wide bandwidth single JFET operational amplifier. The high input impedance of the IC makes this circuit....
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This inexpensive circuit can be connected to an air-conditioner/fridge or to any other sophisticated electrical appliance for its protection. Generally, c....
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ICs has been used in many audio amplifiers, especially small circuit. It is convenient to use transistors. But when you need to use transistors, it has several advantages, such as saving you can take old equipment come to made small circuits easier than the....
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1500 Watt RF Amplifier circuit can be used to drive your transmitter antenna, it can also include driving to the source of the RF high power, microwave heating, and more...
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The Micon-GHS clock is a very accurate handy clock for mobile observation with some intelligent facilities. `Note that "Micon" is a short form for "Microcomputer" in Japanese. `The clock was operated by referring the GPS (Global Positioning System) signal,....
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Many devices operate from a car"s 12-V electrical system. Some require 12 V; others require some lesser voltage. An automobile battery"s output can vary from 12 to 13.8 V under normal circumstances. The load requirements of the device might vary. This....
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This project provides an simple F1 motor racing style 5 light race start sequence with a random delay that you can use on a real race track, kart circuit or even your slot-car circuit.
Operation is simple; when the start button is pressed all the LED....
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Another JYB type liquid level controller 119 internal circuit shown in FIG. This circuit uses the Schmitt trigger circuit (VTZ, VT3 composition), so that the action level contr..
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The red laser line slowly sweeps the object (here a Fabuland lamb head). Behind the scanned object, two planes with a 90 ° angle provide reference to the scanning software. They are also marked with regularly spaced black dots that serve during the....
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The LTC1050 is confi gured as unity gain 2nd order low-pass fi lter which center frequency is (1.2πR´C´) = 1.72 • fCUT-OFF = 17.2Hz and Q = 0.5. Figure 2 shows the amplitude response of the fi lter, and Figure 3 shows a well behaved transient response for....
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Before its move offshore, I was lucky enough to be involved in developing the avionics system for the Flightship Ground Effect FS8 craft....
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Also known as megger insulation resistance meter, the resistance in megohm level. Mainly used to measure the motor, the insulation resistance of electrical circuits, equipment,..
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Here the simple mixer with 4 input and 2 op-amps: A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net gain of ten (or any....
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Hey! It`s another ESQ-1 repair thread! I got an ESQ-1 tonight for a very good price, and I totally expected it to have a few issues. And it`s got them....
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A different circuit of electronic lock very simple, one and does not need a lot of materials in order to it is manufactured....
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A 555 timer IC, operating in the one-shot mode, is triggered by light striking photoresistors. These normally have a resistance of several megohms but, in the presence of light, that resistance drops to several hundred ohms, permitting current from the....
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Mainly f. m. receivers are of the superhetrodyne variety. Before we go into any depth about f. m. radio receivers let`s consider the principal differences between a. m. and f. m. signals. At first glance it might seem I am merely stating the blinding obvious....
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Here`s how to build a pendulum-controlled clock which can be made really accurate. Retro - yes, but an interesting project all the same. You`ll need a spare quartz clock which must be adapted by first isolating the two pads on the chip which lead to the....
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This is a Wien-bridge sine-wave oscillator circuit. This circuit uses negative-feedback stabilization to make sure the gain won`t go higher than unity to....
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No Description available...
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Here s a design circuit that is used to active circuitry and an analog meter to make sensitive DC current measurements. A reader subsequently asked if it could measure AC microamperes and that is what spawned the idea. This is the figure of the circu ....
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This melody generator can generate various English and Hindi tunes as also instrumental effects. Various modes of melodies can be selected through DIP switches. Other advantages are high volume and volume control. IC UM3481A is a 16-pin multi-instrument....
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The Sound Blaster 16 PCI and Sound Blaster 16 ISA do not have a very sensitive microphone input. This little one transistor amplifier is powered directly from the microphone jack on the sound card and has LOTS of gain. Just put a 100uF bypass capacitor in....
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AM This circuit is tested and functionable. LM389 integrated circuit as the core element, the voice channel number acquired by the microphone MIC and converted into electrical ..
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The circuit can operate lamps and buzzers from the 120 V, 60 Hz power line while maintaining positive isolation betweenthe telephone line and the power line..
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This was designed to flash a pair of LEDs to be mounted on the wing tips of a Parkzone Citabria R/C (remote control) airplane. The unmodified Parkzone Citabria only weights 20 grams (about 0.7 oz), so weight, and therefore the number and size of the....
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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....
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If a circuit is to switch a mains voltage, a relay is a simple solution in cases where switching times are long and high currents are involved. However, a....
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A Hartley Oscillator is a style of oscillator that uses two series connected inductors or an inductor with a center tapped coil, along with a capacitor. The tank circuit is formed by the inductor and the parallel capacitor. An oscillator circuit requires an....
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The Telephone project posted here is the a telephone ringer which producespleasanttunes when a call is placed to your number. The tunes produced by telephone ringer here are more melodious andsoothing compare to those of old telephone instrument and piezo....
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and C code for a PIC frequency counter operating up to about 50MHz. The project uses an HD47880 LCD for the display and uses timer 1 to count edges of the input signal....
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This idea demonstrates three uses for the humble LED. The circuit in Figure 1a forms a simple light detector that latches and turns on an LED when the ambient light exceeds a preset limit determined by potentiometer P1. LED D1 is both the indicator and the....
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nokia 5130 keypad jumper just follow the diagram.. tested just now.. after doing the jumper.. all keypads working well ....
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The vacuum tube is still alive and useful in some applications, as in this CW transmitter, The circuit was built in old-fashioned breadboard style on a wooden base. Old table radios are a good source of parts for this circuit. V3 is used as a ballast....
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The Liquid Crystal Library allows you to control LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the 16-pin interface. Before wiring the LCD screen to your Arduino we....
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With the microelectronics and technical fast development of information, the digital technical development represented by one-chip computer changes with each passing day. Because one-chip computer have small, low power dissipation, strong expanding....
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Acoustic spectrum is extended by the 20Hz frequency is very low and reaches as high frequency 20000Hz. In the low frequency is lowered sense of direction. This reasoning leads us to attribute to the speaker`s use of very low frequency. Making it to you we....
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Atmel joins NXP, ST, Luminary Micro (now TI), and Toshiba as a microcontroller vendor to use the ARM Cortex-M3processor core. As a presumed replacement for some of their ARM 7 based MCU products, Atmel`s first Cortex-M3aims to differentiate from the rest by....
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This is simple a led flasher circuit that I would link to suggest you make it.But before you can use transistors,which difficulty when we learn about digital....
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The circuit can be divided into four sections: power supply, touch sensor, microcontroller, and LED driver. The touch sensor is connected to the frame....
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Clocks have been mentioned in the preceding section with regard to their action with FFs. You will recall that this circuit is a timing signal generated by the equipment to control operations. This control feature is demonstrated in both the D and J-K FFs.....
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By looking at the layout of the PC board, decided to insert a stereo 3mm canceling type jack (5 pin) at the volume control chip inputs, and mounted it on the front panel. Did not find such type of jack in my parts bins, and canibalized one out of a old PC....
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This is a single-ended triode amp that I built using the 813 transmitting pentode, connected as a triode. It`s a fairly powerful SE amp that works very well. It uses a single pentode as the driver (a 12HG7 video amp tube), and a solid-state power supply with....
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Electronic project describing a D.C. Mixer for Synthesizers and other control applications....
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Phonographs are gradually becoming a rarity. Most of them have had to yield to more advanced systems, such as CD players and recorders or (portable) MiniDisc player/recorders. This trend is recognized by manufacturers of audio installations, which means that....
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The LTC3205 is a highly integrated multidisplay LED controller. The part contains a high efficiency, low noise fractional step-up/step-down charge pump to provide power for both main and sub white LED displays plus an RGB color LED display. The LTC3205....
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Brief full-power flashes are obtained when the SCR conducts during positive half cycles of the line voltage. The SCR fires when the voltage at the divider, R3 and R4, reaches the gate-firing level.
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With the aid of an (old) moving coil instrument it is very little effort to make a simple voltmeter that, at a glance, indicates the status of a telephone line. Because the input impedance of this circuit is very high, there is no problem in having it....
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The inverter circuit has a central component, the CMOS 4047, and converts a 12V DC voltage to 220V AC voltage. 4047 is utilised as a astable multivibrator. At pin 10 and 11 we find a rectangular symmetrically signal which is amplified by tow Darlington....
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DC voltage present on the telephone line is usually about 45 to 50V, on-hook and off-hook to 6V. The step-down circuit relay is activated. Relay control tape recorder. Audio is..
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The circuit shown here is of a simple 0 to 9 display that can be employed in a lot of applications. The circuit is based on asynchronous decade counter 7490(IC2), a 7 segment display (D1), and a seven segment decoder/driver IC 7446 (IC1). The seven segment....
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This kit was designed to control the speed of AC motors with carbon brushes, anything from drills to saws to vacuum cleaners. Unlike other circuits such as normal dimmers the kit performs a phase cut only once per period. The moment of cutting determines the....
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Controlling the output voltage from a regulator can be made variable in three ways:-
1. Using a fixed reference zener diode to increase the output by the value of the zener
2. A variable resistor for variable output, note that a voltage less than the....
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The following diagram is the circuit of Stereo OTL Audio Amplifier. It based on IC circuit, so the circuit looks simple. You can use IC LM379, LM377, LM378 for this amplifier project. Refer to the table, maximum voltage supply for IC LM379 is 28V, it will....
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If you can`t see any characters displayed on the LCD (and you`ve checked that the hardware and software are working) turn the LCD Contrast pot until you can see the characters. To load an 8 bit character or LCD command into the 74HC164 shift register, the....
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Using a Motorola MC34118 speakerphone IC, this adapter can be used with a regular telephone to provide speaker capability. This device is powered from the phone line, but it can be powered via an external power supply if the line loop current is marginally....
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In contrast, the circuit in Figure 1 physically inserts a resistor in series with the load to limit the inrush current and then short-circuits the resistor after a time delay. You can adapt the circuit to any size load by suitably selecting the series....
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Enable the Gene to progressively lower the power applied to the heating element, so that rather than switching it on and off, it simply got less hot, minimising the temperature gradient within the drum and the overall maximum temperatures the beans are....
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Blinks 2 LEDs timely in sequence. Will somebody explain its working I know that capacitor will charge and during the charging the LED will off and whenthey discharge they will on the LED. But why transistor are there..
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The output of the 4017 is 100% duty cycle. so that means if you have step one and step two on, they will lead right into each other and you`ll have a step that is 2 cycles long. The output of the 555 timer is a 50% duty cycle. The AND gate combines the outs....
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The P-C70-A from Antique Electronics Supply works just as well and maybe a little better than the coils you can wind. Winding coils is an interesting experiment and you may want to do it just for the fun of it. If you would rather skip all the fun you can.....
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Precision oscillator can be built using quartz crystal, but with proper component selection, you can also build one with RC (resistor and capacitor) circuit....
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With a 9 V DC battery, it worked fine. But because of a less DC power, solenoid was not generating a powerful enough force. I modified a computer power supply as the power source. Now when providing +12 V (15. 0 A) power from it, the solenoid valve is pulled....