Popular Circuits Page 57
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As shown, a 555 timer (Ul) is configured as an astable multivibrator (oscillator) with a 400:1 duty cyc..
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The circuit is a simple op-amp but with two diodes (the transistor b-e junctions in the feedback to split the feedback for positive and negative outputs. On positive output from the stepper coil the top transistor tuns on, on negative, the bottom. One or....
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oscillator. An electronic circuit that converts energy from a direct-current source to a periodically varying electric output....
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With the world`s non-renewable resources being consumed at an alarming rate, it`s no surprise that when the new curriculum was released, 2 ½ years ago, the word `environmental` appeared in the key concepts. The programme of study goes on to add that this....
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Circuit output voltage can be continuously adjusted from zero to maximum. Its baseline is a constant current from the auxiliary power supply circuit. 500 Europe reference curre..
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Transistors are inevitable parts of Electronic circuits. The success of a circuit design lies in the selection of proper transistor type and calculation of....
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This circuit displaying the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to ....
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When you need an amplifier with high watt power. For use in applications such as concert, theater, the festivals etc. This circuit is most suitable. Both....
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On those occasions when we want to see if an amp works, the best tool we can use is a source of acoustic signal with a frequency around the 1 kHz. These characteristics can be merely 'tolerated', because in cases of rapid tests rarely consider whether the....
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As shown by MAX4102/4103 unity gain buffer circuit shown in FIG. This circuit uses a small resistor (24 ) placed in the feedback loop amplifier constituting a unity gain buffer..
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As shown for the acoustic logic level probe circuit. The probe consists of a voltage comparator, multivibrator, piezoelectric ceramics HTD and other components. Wherein the com..
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This stereo amplifier is for car purpouse and can deliver up to 2 x 22W using a single TDA1557Q or TDA1553Q from Philips. TDA1557Q TDA1553Q datasheet More audio car amplifier circuits....
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Second, I have found that when the receiver was centered in the brightest spot (middle) of the reflected laser beam the circuit worked poorly compared to when the receiver was placed off-centered. This probably indicated that the circuit was saturated when....
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The three-tone ringing integrated circuit U4076B in conjunction with a piezo transducer or loudspeaker replaces the normal electromechanical telephone bell. It is operated with the ringing current fr....
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Shown for the extended common mode input voltage range of the instrument amplifier circuit. The circuit A1, A2 and A3 can be precision instrument amplifier INA101 or INA102 constitution. ..
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Texas Instruments introduced TPS54618, 6-A step-down SWIFT DC/DC converter. The new TPS54618 monolithic synchronous switcher with two integrated 12-milliohm....
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One of the nicest features of the 8-bit KX8 microcontroller (manufactured by Freescale Semiconductor) is that it includes an internal clock generator (ICG). This allows the chip to run without the trouble and expense of an external crystal or canned....
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This motor overload circuit does not simply disallow overloading since it is permissible to overdrive a system but only if it is done for a short time (typically dependent on heat buildup). An overload detection circuit protects a motor against currents....
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A complete AM radio set based on the MK484 IC (formerly ZN414). It uses a PNP transistor and can drive a 150R loudspeaker. Chad has built a complete radio receiver using 1 IC and a single transistor. The IC requires around 1.2 to 1.6V and this is supplied....
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This is a LM338 based power supply which is not complicated and easy to build. I am using the supply for a long time, have no problem yet. Only current adjust is missing but I overcome this situation by using an LCD panel ampermeter. There is no PCB for the....
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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...
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As a photoelectric switch with photoresistor circuit, the sensitivity is very high, as shown for the light control relay. At low illumination, VT nonconductive; when there is l..
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The use of a quarter-wave parallel-wire line as a tuning unit has been discussed in the chapter on Short-Lines, where it was pointed out that these " circuits " have comparatively high Q even at the higher frequencies. Their great length ( »/4) prevents....
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RS-232 is the most common serial interface in the PC world. Most RS-232 interfaces communicate with the receiver at a fixed transmission rate, such as 9600 baud. But what happens if the transmitter operates with different transmission rates? Different....
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The VTSE uses the popular 1381 chip and that is its main advantage. The potentiometer (or two fixed resistors) connects one leg between the output and input of the 1381 and the other leg to the supply voltage. These resistors acts like a voltage divider....
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Notes: The frequency of the transmitter lies within VHF and VLF range on the TV channel, however this circuit has not been tested at UHF frequencies. The modulated sound signal contains 5. 5 -6MHz by tuning C5. Sound modulation is FM and is compatible with....
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This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. Especially suited for car or panel pilot lights, this device can drive lamps....
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This circuit Simple DC to DC Converter For Digital Circuit. It use Volt supply 5V Only, To Output Step up Volt 10V-12V DC max. I use IC 555 ( hot ic Timer) for....
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Here is a high sensitive touch plate circuit using NE555 which turns on a buzzer when anyone touches the metal plate or by hovering his hand over the plate. From the previously published touch control switch circuit, this circuit has an advantage of high....
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Make sure to double-check your connections using the circuit diagram and schematic below. You can use this while you follow along in the tutorial vide....
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In the refrigerator before cooking after eating fish, meat and other food to be defrosted. The freeze was put into water, and the..
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None of those devices is very suitable. The drivers aren`t specified to operate with 3.3V gate signals, and although the typical graph shows that a....
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This door open alarm electronic project is designed using an linear hall effect device and a 555 timer circuit. This door open alarm alarm electronic project is based on the TL3103 linear hall effect device used for detecting the angle of rotation. The....
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TDA7294 is a monolithic integrated circuit in Multiwatt15 package, with high output power (up to 100W) intended for use as audio class AB amplifier in Hi-F....
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The allowable reduction in system performance. For a fire control radar, the acceptable degradation is usually expressed as a reduction in range; for example, the maximum lock-on range might be degraded by 25 percent without loss of essential defense....
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How to use a desktop computer to solve the complex arithmetic needed to design state-variable filters for audio use. Construction of a tunable notch filter for measuring harmonic distortion is featured. Audio Amateur Corp. did a beautiful job (as always)of....
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I am continuing to add DIY equipment to my home workshop. Audio oscillator is a very useful tool that is needed when we test audio projects. I already have a similar tool but it is just an oscillator without a frequency counter. I decided to use the....
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A Dozen Small Cmos Alarm Circuits Circuit Description This is a selection of small self-contained alarm circuits. The main features of each alarm are described on the circuit diagram itself. They all have a very low standby current. So they This is a....
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Repell those repugnent insects from your Garden this Summer with this insect repellant circuit. Designed by Graham Maynard the circuitry consists of a phase locked loop (CMOS 4047) wired as a 22KHz oscillator. The output is amplified by a pair of....
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A temperature sensor (MCP9700 linear active thermistor IC) and LCD are connected to the Arduino in this tutorial. The Arduino reads the temperature from the MCP9700 on analog pin A0 and displays the temperature on the LCD....
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Output voltage great enough to jump a l-inch gap can be obtained from a 12-V power source. A 555 timer IC is connected as an astable multivibrator that produces a narrow negative pulse at pin 3. The pulse turns Ql on for the duration of the time period.....
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This is a single zone alarm - with independently adjustable Exit, Entry and Siren Cut-Off timers. It will accommodate the usual types of normally-closed input devices - such as magnetic-reed contacts, foil tape and PIRs. If you wish - you can use a mains....
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This page identifies all the hardware modifications necessary to adapt a Kenwood TK-931 transceiver for 902 MHz repeater receive operation. Not shown here is the effort required to program the radio for the desired operating frequency. This is accomplished....
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To model an LED in PSpice, use the diode model. You can set the IFK and ISR parameters in the diode model to zero; Figure 1 shows the resultant PSpice diode forward-current model and corresponding equations. As the equations in the figure show, you can....
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RF detector circuit, RF amplifier circuit, auto gain control circuit (AGC) etc is already built inside the IC due to which you can easily build a high quality and sensitive am receiver using this IC. The ZN415E IC is an advance version of ZN414 IC, the....
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555 IC using a delay circuit ter It is the transition from low to high delay circuit. Ie after pressing the button SB, after a delay after birth, the output terminal goes high ..
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The source connection is tapped into the tuning coil low down, as a means of impedance matching with the headphones and acts as the anode, while the drain connects with your headphones as the cathode, to complete the detector part of the circuit. According....
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By using an RC oscillator and a programmable divider, this counter can run for hours. An interval osc..
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Closing the switch S. SCR vs through resistors R1, R2 and S trigger current and get opened, charged with H lamp that is eligible for the full-wave AC normal light; open the swi..
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The circuit featured here is very useful to save you from burning your tongue. The coffee thermometer is composed of a voltage regulator, a temperature to voltage converter, a comparator and two LEDs. Roughly described, the circuit works this way: if the....
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Build this exciting Jacob`s Ladder and watch electric arcs ascend the ladder and evaporate in space. It works from a clever 12, 000-volt power supply. Author Robert Iannini. " People have long been fascinated by electric arcs-and perhaps put off by them.....
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Some applications may not need user display and key interface, dump terminal is an alternative way for program setting, displaying user interfacing command.Debugging, dump terminal connects with serial port, use only 2-i/o pin, P3.0 for Rxd and P3.1 for Txd.....
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The driver in the package is connected as a Schmitt trigger oscillator (A) where R1 and R2 are used to generate hysteresis. R3 and C are the inverting feedback timing elements and R4 is the pull-down load for the first driver. Because of its current....
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This inverter circuit can offer a really stable 230V Output Voltage. Frequency of operation is decided by a VR1 and is generally set to 60 Hz. varied off the shelf transformers can be used. Or Custom wind your own for best results. additional MosFets can....
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If you want to connect a video signal to several destinations, you need a distribution amplifier to match the 75-ohm video cable. A distribution amplifier terminates the incoming cable in 75 ohms and provides several outputs, each with 75-ohm output....
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The ultrasonic signal which was received with the reception sensor is amplified by 1000 times(60dB) of voltage with the operational amplifier with two stages. It is 100 times at the first stage (40dB) and 10 times (20dB) at the next stage. Generally, the....
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Capacitance/C tuck bit IJ volume level change is directly converted into electrical parameters, electrical parameters and then be converted to a unified signal transmission, pr..
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In the circuit, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28 LED clock circuit above. The minutes section of the clock is comprised of....
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This circuit is suitable to amplify and distribute the audio signals. The input audio signal is applied to the J1 and after passing through the P1, It is buffered and amplified by the U1 prepared to redistribute. It has 3 output to drive 3 audio lines with....
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Simple TV transmitter circuit using the TV modulator circuit IC MC1374. 12V supply, channel 3 or 4 operation, FM modulation for sound....
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With AudioWave 2.0 your soundcard becomes a comfortable LF-signal-generator, which produces signals from 1Hz to 20 kHz with a resolution of 1 Hz. Phase shift between left and right channel is adjustable from 180° to +180° and an attenuator can be used for....
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Simple proximity detector circuit based on NE567 IC. Circuit switches an LED when the object comes near the sensor....
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Lamp dimmer. The figure below shows the circuit can be used for lamp dimming. It uses a small quantity of components, which can be installed inside the lamp seat. The circuit is commonly used in RC phase shift circuit. W can be adjusted to change the triac....
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The circuit work theory This infrared automatic hand washing device circuit is composed of power supply, infrared transmitting circuit, infrared receiving circuit and control circuit, the circuit is shown in the figure 9-121. The power supply circuit is made....
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The detector uses three sections of an L144 and a DC4011 type CMOS NAND gate to make a very low power voltage monitor. If the input voltage, Vin, is above Vhigh or below Vlow, the output will be a logical high. If (and only if) the input is between the....
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The use of optical filters to reduce/remove light from other sources. If a fairly narrowband optical filter were used on the receiver, "off-wavelength" light could be rejected - but such filters are quite expensive, they can be difficult to implement on a....
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This circuit is selective for the tuning adjustment between two closely spaced tones audio. The frequency is dependent on the selective value capacitors and resistors in the feedback circuit between the collector and base of Q1. With the values shown, the....
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This is a circuit diagram for a solid state charge detector. It can detect very weak electric fields. The circuit has three components: a 6-volt battery, a light-emitting diode (LED), and a field-effect IC ADM666A..
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DC-coupled single-tube amplifier (l) single-tube coupling the DC amplifier so-called single-tube DC-coupled amplifier circuit means only consist of a transistor, the basic comm..
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If this picture (above) looks a lot like the Pretty Good LC Meter also on this web site, that's because its the same meter, but with some significant improvements. At this point, its a good idea to read the Pretty Good LC Meter page because the rest of this....
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Samsung C3330 Circuit Diagram Download Manual PDF Download...
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This diy digital thermometer circuit can measure temperatures up to 150?C with an accuracy of ?1?C. The temperature is read on a 1V full scale-deflectio...
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Hack the pitch shift of the crash and ride by lifting pin 10 of the TC4040 binary counter and insert your own clock in (or just whack it with an additional clock source). This could be any suitable signal you pick up from the TR itself. The other sounds do....
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In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a....
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The heart of this circuit is a crystal oscillator. A 10MHz crystal is used to produce highly stable carrier frequency. The sound signal from the condenser mic is amplified by the amplifier circuit consist of transistors Q1, Q2 and Q3. The amplified audio....
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This circuit bellow shows a simple voltage-controlled oscillator (VCO), coupled to your instrumentation by an optoisolator, the function for ....
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Note that I have separated the PWM Output section into the upper left corner with a heavy purple line that is bridged by the jumper JP1 on the APM2. 0. This is to emphasize that diode D1 passes current through JP1 (and drops voltage). The remaining energy is....
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The EPIC Plus Programmer, Serial Programmer, USB Programmer or U2 USB Programmer may be used for in-circuit serial programming of serially programmable PIC Microcontrollers through the 10-pin expansion header J3. Vpp, RB6, RB7 and ground should be connected....
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The sensing circuit consists of a 741 op amp set up as a voltage comparator, using a zener diode as a voltage referen..
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Improve the power factor PF Use a energy-conserving important factor of electrical equipment. With the development of electric electron technology, high-frequency active power factor correction PFC Technology has already been more and more applied to various....
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This circuit was designed to allow a laptop computer to be powered from a solar power setup. The computer requires 12V at 3.3A. The circuit is a linear re....
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Real-world measurement requires the extraction of weak signals from noisy sources. High common-mode voltages are often present even in differential measurements. The usual approach to this problem is to use an op amp or an instrumentation amplifier and then....
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IR detector diode D1 intercepts the IR signal at around 40 kHz and feeds it from U1, a high-gain preamp, to PLL, U2, a 4046 configured to serve as an FM detector. U3 is an audio amplifier that feeds a pair of headphones or a speaker...
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One of the most interesting projects to work with is that of a synthesizer that can accurately gnerate desired frequencies. This synthesizer uses just three CMOS chips and one PNP transistor. It is a fact that the transistor may be the hardest component to....
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The output F1 pin 17 of the PLA U17 goes "low" when the BASIC ROM is selected. The KERNAL ROM resides at locations $E000 - $FFFF. The output F2 pin 16 of the PLA U17 goes "low" when the KERNAL ROM is selected. The CHARACTER GENERATOR ROM resides at locations....
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A two-tone generator that is alternately switched ON provides a high/low output as might be heard from a traffic vehicle like a police car or ambulance. IC1, CD4011, quad 2-input NAND gate is a two-tone oscillator in which each side, pins 1 through 7 and 8....
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I`ve just bought a mixer without a PSU. I don`t really need the 48V phantom, so can I just use an 18V DC wall wart type PSU? If yes, which pins should....
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Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer...
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This circuit provides a good siren noise suitable for warding off robot-predators! Change the pitch by adjusting R2, and R5...
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AN6610 Application Circuit It works briefly as follows: When the supply voltage vcc motor mechanical or negative change when the load changes, can cause changes in motor speed...
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As shown in FIG, O pin output reference voltage VREF is not used for the internal circuit, it is supplied to the external circuit; similarly, pin output voltage VREG is supplie..
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Here is the circuit diagram of a battery eliminator circuit that can be used as a replacement for 9V PP3 batteries. The circuit given here can be used to power any device that operates from a 9V battery. The transformer T1 steps down the mains voltage and....