Popular Circuits Page 133
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Uses National have sound. MM57100 TV game chip to provide logic for generatingbackgrounds, paddles, ball, and dig ital scoring Circuit generates all necessary timing (sync, blanking, and burst) to interface with interface directly to antenna terminals of....
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As shown in the one-button control switch with one button control two relays, two respectively turned negative as needed Load power switch. Circuit mainly by a hex inverter CD4..
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The "crossed-flags" topology of a monostable multivibrator. Also, this particular board happened to be a 912 tach, so R5, which determines the discharge rate of C2,would be different for a 911. 912`s have a 50% duty cycle (four cylinders, 45 degrees of dwell....
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This is a circuit that used to main pulse. The pulser is intended to switch the mains voltage on and off at intervals between just under a second and up to 10 minutes. This is useful, for instance, when a mains-operated equipment is to be tested for long....
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A series of digital clocks, all with LED outputs, were created for the Electronics in Schools Strategy (EiSS) and used in several of the courses run on behalf of SETPOINT (now STEMPOINT) Devon & Cornwall for secondary school teachers in the south west. The....
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Hi! I want to DIY a 300BSE power amplifier recently, could somebody recomend or provide me a wonderful and robust schematic??? I will use Lowther PM6....
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It is a simple circuit regulated power supply, based on the known LM 723, that drive a transistor Q1 [2N3055]. The regulation of voltage, of expense becomes with potentiometer R1 from 0v-30v DC roughly. In order to we achieve 30 V, will should the....
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Most thefts happen after midnight hours when people enter the second phase of sleep called paradoxical` sleep. Here is an energy-saving circuit that causes the thieves to abort the theft attempt by lighting up the possible sites of intrusion (such as kitchen....
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Many passive field strength meters have appeared in the past, typically using a 50mA analog meter movement if reasonable sensitivity was to be obtained. This circuit is similar but has the advantage that it works with the high-impedance load of a digital....
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This is single op-amp tone control circuit. This circuit is a hybrid low-pass, high pass and one-pole circuits with attenuation and gain. This circuit is the....
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This is a reproduction of the filter circuit and mic windshield design referred to in the article "Wildlife Recording In Stereo" by David J Tombs which appeared in 1974...
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The basis for this amplifier is published as Project 03, and makes no claim to be state of the art in fact the base design is now over 20 years old. It is a simple amp to build, uses commonly available parts and is stable and reliable. The design featured....
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This circuit sent out an alarm when its LDR sensor is exposed to light by sun or lamp. A 555 astable multivibrator was used here which sent signal a tone of about 1kHz upon detecting light. The sensor when exposed by light completes the circuit and makes the....
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This is a real time clock by using 89c51 micro-controller, clock`s data format is hour:min:sec, and it is displayed on 16x2 LCD, the code has been tested and compilled on Keil uVision compiler, circuit diagram for the project is shown below...
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Reduce the IC s supply current for about 50% This article presents a high reliability 1200V High Voltage Integrated Circuit (1200V HVIC) for half bridge driver applications. It....
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Adjustable pulse generator circuit Shows an adjustable pulse generator circuit, which is a periodic signal and the pulse width can be adjusted independently of each other and t..
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This sensitive sound operated switch can be used with a dynamic microphone insert as above,
or be used with an electret (ECM) microphone. If an ECM is used then R1 (shown dotted) will
need to be included. A suitable value would be between 2.2k and 10kohms...
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Here is the circuit diagram of an ultrasonic mosquito repeller. The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range. The circuit is nothing but a PLL IC CMOS 4047....
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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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Circuit in the frequency range, an accuracy greater than 2%, for the production of bode curve. Two sine wave into a square wave, while the amount of overlap compared with the t..
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It is important to know that transistors Q1,Q2,Q3 must not work like an astable (tri-phase) multivibrator (you could verify it on scope (no square waves but NON LINEAR wave between XB, YB, ZB must be displayed on the scope)...
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This MP3 Player FM transmitter can be used to listen to your own music throughout your home. The transmitter circuit use no coils that have to be wound. When this FM transmitter used in the car, there is no need for a separate input to the car stereo to play....
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In this intercom schematic, the 8 ohm speakers is used as microphone and listening speaker. The 10K potentiometer controls volume and the total gain can be....
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this is a very easy circuit to build - all parts can be found at the local electronics shop...
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As shown in FIG grounds PGA202 OPA633 op amp output current boosting circuit configuration. This circuit PGA202 output of an operational amplifier plus the ability OPA633, OPA6..
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The following diagram is the 50W offline switching power supply circuit design. The circuit powered by a MOSFET. BUZ80A/IXTP4N8 for 220V AC voltage input and GE IRF823 for 110V AC input voltage. The output will be 5VDC with electric current up to 10A. The....
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The tuned coil L1, has two output tapping for the antenna connection, marked "A" and "B". These are both low-level outputs and you choose which tapping you want to use ( stable low range, or more unstable but higher range). Tap B (2. 5%) takes just a very....
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Here is simple method that you can try. It might NOT be as accurate as scientific professional tools, but seems more accurate than some of the manufacturers. Wire the resistor in parallel with the photodiode to reduce saturation effect. Normally, wire the....
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I experienced faulty DS18B20 reads on my tank thermometers, probably due to my heatshrink/silicone waterproofing method. It gave me a chance to improve my code to make the controller more tolerant of bad reads, but my tank thermometers have now been replaced....
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This circuit places a maximum limit on the current available from the output terminals. It does this by limiting the maximum current that can flow through Q1. Because the output terminals are in series with Q1 - limiting the Q1 current also limits the output....
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DC-coupled multi-stage amplifier circuit b (3) multi-stage DC-coupled amplifier in DC-coupled by a multi-stage amplifier circuit amplifying circuit, if used NPN type transistor of each stage,..
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This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level. It should be mounted on top of the recipient (e. g. a plastic tank) by means of two crocodile clips, acting also as....
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A frequency-selective frequency multiplier can be construct with a PLL system by inserting frequency divider inside the feedback between the phase detector input and the VCO output. Figure below shows the schematic diagram of low-frequency synthesizer with a....
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Here is a schematic of a simple water or liquid level sensor relay switch circuit, which can be used to switch on or off electronic appliances at the desired level of water. The circuit is ideal for automatically switch off the water pump when your water....
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The frequency is constant varying between two set values, on the oscilloscope screen you get a frequency spectrum with the response curve of the two circuits. The input voltage of the receiver is 0. 1 Volt peak-peak, the voltage across the detector circuit....
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This incredibly simple thermometer plugs on any free serial port. Does not make use of any programmable components as microcontrollers. It gives temperature readings accurate to 0.5°C with no calibration. It's cheap, so I've put one on any PC I use. And it....
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This is the circuit diagram of a voice operated relay. It similar with sound activation switch circuit which will turn on and turn off (connect and disconnect) the switch depending on the sound input. The output switch of this circuit is act by a relay. You....
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Measuring the radiation can be made not only with expensive factory-made instrument. The simplest device (see Figure 1), can be build if you have a counter (radiation detector) type SBM-20 or similar. The circuit is powered by a 220 volts AC 50/60Hz. The....
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Many amplifiers have phono inputs for connecting record players to the amplifier. Phono input is designed to take a up to few millivolt signal from phono pickup and amplify it. The amplifier stage does also some equalization based on standardized RIAA curve.....
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The circuit is used to indicate two different water temperature trip points by turning on LEDs when the temperatures are reached. The circuit is constructed around the LM2904 dual operational amplifier powered from the 12 V auto system. The thermistor is in....
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This transmitter, as shown in the drawing, consists of a 6V6 as an oscillator, then the signal excites an 807 which acts as a buffer. The final step consists of two 807 in Push-Pull. The amplifier consists of three in series double-triodes ECC83 and finally....
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As I described in the last step, setting the 555 timer up in astable mode causes it to output a continuous series of pulses. In this circuit, I`ll se....
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This circuit is especially designed for those who often need to wake up early in the morning. Ordinary alarms in electronic watches are not loud enough an....
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A functional block diagram is shown below and illustrates
the primary circuit functions. These include equalization,
reclocking, and driving 75W co-axial cables. A complete
schematic is also included.
The EB-RD35 accepts a serial digital data input....
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Programmable timer for appliance circuit is advanced timer appliance is controlled by timer circuit from 8 sec. to 2 hour.circuit diagram of programmable timer for appliance ...
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This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days....
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Photo. This is the test circuit -the basic driver is only two transistors, two resistors, the circuit was evaluated using a white LED, but when it was time to button it up and archive it, I replaced the expensive white LED with a cheap green one...
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This Arduino-powered vocal effects box pitch shifts and distorts incoming audio signals to produce a wide variety of vocal effects. This project is my first experiment with real-time digital signal processing using Arduino. It samples an incoming microphone....
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This project is a GPS based clock, which also displays the present date, automatically compensates for daylight savings time, displays current speed, and maximum speed, along with your present heading in degrees with respect to true north. The original....
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Whenever there is a need for battery-powered lighting, like for camping, solar powered cottages, cars, boats, planes, or emergency purposes, fluorescent lamps have a great appeal. Firstly, they are very much more efficient than glow lamps, so they produce....
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Figure 16-3 (a) one-way thyristor; Fig. 16-3 (c) for the triac. Circuit characteristics: O simple phase shift range 90. [Figure 16-3 (a)], phase shift range 180. [Figure 16-3 (..
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The major device in the circuit is SRI (a TGS812 toxic-gas sensor manufactured by Figaro Engineering Inc.) The gas-sensitive semiconductor (acting like a variable resistor in the presence of toxic gas) decreases in electrical resistance when gaseous toxins....
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The circuit in Figure 1 is an effective driver for LCDs. The circuit comprises two main sectionsthe ICM7211 drivers (IC2 and IC3) and the YN06 display itself (IC1). The Intersil (www.intersil.com) ICM7211 is a 4-bit LCD driver that needs no external....
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PIC16F778A is widely uses now and it is also famous among the beginner until all theprofessionals because of the FLASH Memory technology which can be write/erase within a tousand times of programming. Speed and code compression are the superiority of this....
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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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There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536). To make the circuit....
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A simple single-transistor Colpitts oscillator whose schematic is shown in figure 2. When a vehicle passes over the loop the inductance decreases and the oscillator frequency increases. A microprocessor which measures the oscillator frequency and takes....
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This discrete voltage regulator has complete features that is equivalent with modern voltage regulator integrated circuit (IC). It`s not cheaper if you build discrete one like this, but it`s always interesting to study the schematic diagram to learn how it....
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The FAN2001/2 (datasheet) Evaluation Board is a compact circuit including either the FAN2001 MPX or the FAN2002 MPX in a 3x3 MLP package..
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Do you have disco ears? If people ask you this and you re still well below 80 , you may be suffering from hearing loss, which can come from (prolonged) listening to very loud music. You won t notice how bad it is until it s too late, and after that you won t....
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If you`re a biker or scooter rider you`ll know how easy it is to forget to cancel your flashing indicators after turning without an audible reminder. Constantly glancing at indicator lamps is hardly an option; your eyes should be on the road ahead! The....
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VHF overtone crystals can be difficult to use due to the many frequencies at which the crystal is perfectly happy to oscillate. A typical 100 MHz, 5th-overtone crystal will oscillate at approximately 20 MHz, 60 MHz, 100 MHz, and even 140 MHz, not to mention....
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Here is camera switch circuit. This circuit can be used for multiple cameras with one monitor. The circuit can be operated manually or automatically. When operated automatically the switch will be connected to the output of 555 astable multivibrator that....
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Choosing de rather than ac coupling can reduce much of the noise associated with preamplifiers for a magnetic reading head, particularly in the low frequencies. The LM1897 eliminates the need for the capacitor that usually ac couples the read head to the....
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The first step is to remove the film. Be sure the film is fully wound in. Then use a flat blade screwdriver to pry up the tab at the seam in the middle of the right side of the camera. The right side of the rear panel of the camera should then pop up. You....
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First circuit is for connecting VGA card to video projector or a monitor which accept VGA card frequencies and has RGB + Composite sync input. This circuit has been succesfully used with Electrohome Projection Systems ECP 4100 data and video projector. This....
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This power supply circuit uses 120 volts household mains and should only be attempted by someone that has the knowledge and skills to safely construct such a project. Otherwise personal injury and or property damage could result...
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Liquid crystal displays are currently available in several versions and various sizes. The wide variety of features, has resulted in there a little chaos in the provision of the pin. So that even when, after much effort, we can find a screen that fits our....
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A UJT Organ circuit with circuit diagram is explained in detail. A 2N 4891 UJT is used for the working of the circuit....
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This circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally good high frequency response, as demonstrated by applying an 100kHz squarewave to the input. I have produced some response graphs using Tina Pro to....
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Booster for audio circuit diagram. Potentiometer R5 of 100K is a linear type with an on/off switch attached. The value of C1 may need to be between 0. 05 µF and 0. 1 µF (47nF/100nF). Experiment with the value for best performance. This is a20 watts audio....
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You may need also need 10 diodes and different resistors, especially if you are using white LED`s please the Troubleshooting section in step 3 for details. . 005 ³ thick matte drafting film I bought a sheet from a local artist`s supply store. The smallest....
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This circuit is design, in order to is heard the voice above the music. Useful for DJ, for small radio stations, for statements above the music, in shops etc. Also we can him use in applications that we want to handle some unit with our voice. As it has the....
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The fins were added to a simple flat aluminium panel, and are made from 20 x 20 x 3mm aluminium angle. Their purpose is threefold - they improve the performance of the plate as a heatsink (although this is not necessary with the BP4078 PWM amp), they make....
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The AGC is used in many system especially communications. This AGC? works at 50Mhz, and the output voltage is set by a digital signal that is needed by...
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A very simple proximity detector electronic project can be designed using this schematic circuit. This proximity detector electronic project use a tone decoder integrated circuit ( NE567 ) that will provides a signal with a frequency about 100Khz. When an....
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Here is a simple but effective burglar alarm circuit that can be fixed on windows to detect break throughs. The circuit uses a fine wire element fixed as a network through the window glass for sensing the break through. Normally the base of Q1 is held to....
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