Popular Circuits Page 13
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The circuit is the use of FET amplifier circuit for output. NE5532 op amp using 15V power supply, pushing its output FET output stage after stage voltage amplification. Voltage output stage bias circuit of the input from the pre-stage of 15V, after VT3, VT4 ..
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300B tube single-ended Class A amplifier circuit is as follows: ..
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A very nice radio control circuit can be used to control the circuit shown below in small motors. The circuit is very similar to the car radio remote control toy 7 function: fo..
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This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one-and-a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also....
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This is a project that I always wanted to do, but managed to put off for a long time. It has been over a year in the doing. Partly because there are so many good phono preamps in existence and I was slightly concerned that it was beyond my design skills. It....
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This circuit is effective for lamp and heater loads. Some circuits driving reactive loads require integral cycling and zero-voltage switching-when an identical number of positive and negative half cycles of voltage are applied to the load during a power....
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Osmond PCB is a flexible tool for designing printed circuit boards. It runs on Macintosh. Its many features include: * Virtually unlimited board sizes * Virtually unlimited number of board layers * Virtually unlimited number of parts....
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In order to make the circuit work, it is important to set the fuse bits inside the AVR micro controller correctly. Theses fuse bits can be set with the programmer that is used to flash the software. For those that are interested to understand the background,....
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I hook up a tesla pancake coil in series with my bifilar wound coil to generate the resonance and the sharp gradient discharge that creates a vacuum flux. I run the CFL on about. 07amps @12. 42volt + 0. 8694 watts! Around the bifilar pancake coil, I have....
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Two MC1408—8-bit D/A converters, A and in the circuit diagram, are used. The four least-significant bits of A are tied to zero. The four most significant bits of the 12-bit data are connected to the remaining four input pins. The eight least significant....
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This circuit can measure both small signal hfe and DC current gain hFE of a low to medium power power transistor....
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This circuit 5 Channels 2 Octave Graphic Equaliser,easy to make equalizer, because using IC LA3600 (easy to use) For you who take an interest sound of music....
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I built my first power amplifier when I was still in secondary school. The circuit was made of transistors, didn`t provide much power and had an ugly PCB. Around the same time I got access to a datasheet of TDA1524, a tone/volume control circuit, and I....
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This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the....
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This lead acid battery charger circuit is designed in response to a request from Mr. Devdas. C. His requirement was a circuit to charge two 12V/7AH lead acid batteries in series. Anyway he did not mentioned the no of cells per each 12V battery. The no of....
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The ICL7665S Super CMOS Micropower Over/Under Voltage Detector contains two low power, individually programmable Voltage detectors on a single CMOS chip. Requiring typically 3A for operation, the device is intended for battery-operated systems and....
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This unit is designed for monitoring the audio output level across a loudspeaker when carrying out alignment of radios. As no great precision is required, a simple passive circuit arrangement has been used. The circuit is a voltage-doubling rectifier driving....
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This switch will suit the Modular Burglar Alarm circuit. However, it also has other applications. The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix type with 7....
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In this circuit the gain is provided by a FET type op-amp. I have used an LF351, which may be hard to obtain, but the TL071CN or TL081CN may be used and have a faster slewing rate than the LF351. The Maplin order codes are RA67X and RA70M respectively. The....
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The switcher output goes to the single vertical input of the scope, and a sync line from one of the inputs is taken to the scope's external-sync input. Frequency response of the input amplifiers is 300 kHz over the range of the gain controls. ..
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Since you will be required to use buses and registers in lab 4, we will make a macro for a register that uses a 4bit bus for the data input and a 4-bit bus for the data output. You will need to make a similar macro for all your components that uses buses, so....
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A very simple 5 volt constant voltage, constant current (CV/CC) universal-input power supply for cell phone or similar charger applications can be designed using the LNK616PG product from the LinkSwitch-II family. As you can see in the circuit diagram, this....
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As high-performance microprocessors demand more power in auto multimedia and telematics, (aka infotainment products), so do some of the well-known problems like noise susceptibility, EMI and loop compensation to name a few. Average current-mode control....
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As shown, this circuit can automatically adjust the brightness according to ambient light intensity of light. If outside, high brightness, light on dark, whereas low ambient br..
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Simple add-on module. A simple approach to this problem can be done inserting a circuit in the preamplifier stage, capable of varying automatically the frequency response of the entire audio chain in respect to the position of the control knob, in order to....
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Power supply with driver TEA1507 is mostly used by TV branded PHILIPS. Power Supply has an efficiency rate of up to 90% - thus requiring less cooling, as well as stand-by power required is less than 1 watt. Power Supply with TEA driver is equipped with a....
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This single white-LED torch can be housed in an empty glue-stick tube and has a long rechargeable-battery life....
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This circuit is very similar with a car radio controlled toy with seven control functions: forward, forward-left, forward-right, backward, backward-left, backward-right, and stop. Also you can use this radio frequency circuit for some other electronic....
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This circuit, a simple mixer circuit. It can mix two signal channels and one channel is output. Using a codec circuit, Convert stereo audio to mono audio time. It can increase the number of channels too. By adding a VR1, R1 and C1 to the amount needed. Then....
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This is a light sensor circuit which will detect light and switch on the relay. This light switch circuit is very simple and using only few components. Working of the circuit is simple, when the photoresistor receives light it will switch on the transistor....
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Timer Ul operates as a free-running oscillator at 60 Hz, providing trigger pulses to timer U2 which operates in the monostable mode. Resistor Rl is fixed and capacitor Cx is the capacitor being measured. While the output of U2 is 60 Hz, the duty cycle....
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Pressing the pushbutton of the transmitter, a sound and/or light alert is activated in the receiver. The system uses no wiring or radio frequencies: the transmitted signal is conveyed into the mains supply line. It can be used at home, in any room from attic....
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The audio mixer schematic we propose is developed arround 4 amplifiers build inside SSM2024 produced by Precision Monolithics Inc. (PMI) and is voltage controlled (VR). The maximum VR voltage is 5. 5Volt. The signal/noise ratio is 90dB and 130Khz band wide.....
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A number of ham radio operators have made their start on the 10 GHz amateur band using commercial-surplus microwave transceivers made by M/A-Com. These units were originally built in white-painted metal enclosures and are known as "White Boxes" They can be....
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After one has built a QRP transmitter, it would be interesting to know the exact amount of output power. Without a power meter the peak to peak voltage Vss is measured at an 50 ohm resistance (dummy load) with the available oscilloscope. Now the power rate....
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This circuit could be used to drive a monostable relay by a singol momentary switch. Powered by 24 Volts it works for a 12 Volts relay. When the button is pressed Q1 is energized and the capacitor charges, while the relay coil is shorted. Once the button is....
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The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET`s VP and IDSS variations. These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a fixed R1.....
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The simplest example SMPS which still uses 3 transistors (C3807, A1015 and power transistors) classic problem that often occurs is: -Problem in the feedback circuit can cause the output voltage B + over so that it can endanger the aircraft as a whole. For....
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This circuit is using Power Battery Terminal (PBT) for easy relay output and aux power connection. The LED on each channel indicates relay status. Berg pins for connecting power and trigger voltage...
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The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR.....
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This LED flasher circuit is a classic two transistor flip flop. This flasher circuit is very popular and it`s usually the first circuit to build when starting electronic circuit building hobby. Here is the schematic diagram of the famous LED flasher circuit:....
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The MAX1846 inverting circuit to implement a switch-mode power supply that provides a -15V at 0. 5A output from a 4. 5V to 12V input. This MAX1846 circuit also adds a few components to the minimum circuit implementation. C20 adds a pole to compensate for the....
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Here they exist two regulator circuits, that use the IC L200, as regulator of voltage and current, the company SGS-Thomson, which give these circuits. In circuit Fig.1, we can regulate the output voltage, with the RV1, while in the Fig.2, we can regulate....
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Typically, 9602 multivibrator circuit can trigger the rising edge or falling edge of the square wave, but not both at the same time can trigger the use ..
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This version of the Link is for those who really need a good cheap intercom that will work reliably, but without access to an outside Telco line. This could be in a pre school, a hobby farm or a small workshop or factory, where external phone traffic needs....
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Section Ul-a is configured as a high-gain inverting voltage amplifier that is inductively coupled to the phone line via LI. Inductor LI is a homemade unit that consists of 250 turns of fine, enamel-coated wire that is wound on an iron core. The op amp....
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The TPA3007D1 is a 6. 5-W mono bridge-tied load (BTL) class-D Audio Power Amplifier with high efficiency, eliminating the need for heat sinks. The TPA3007D1 CAN drive 8- speakers with only a ferrite bead Filter required to reduce EMI The gain of the....
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The function of this automatic volume control circuit is to amplify signals without distorting its dynamic compression. The amplitude differences in the signal are levelled off and the disturbing effect vanish. With this tehnique, overcompensation in the....
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This preamplifier is requirement result of many friends to give a high quality preamplifier, capable to drive high quality power amplifiers with good sound, it`s not however difficult to making, it combines simplicity and handiness. It does not allocate a....
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As shown, the count switching circuit comprises an electronic switch and a pulse delay circuit control. ..
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Snap all connectors on to the flat cable (a small vice will do the job). You get an instant male-male, male-female, female-female serial adaptor, plus a short extender cord. A must-have tool if you`re planning to play with serial ports. You can even put an....
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A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10 volts....
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Circuit Diagram for Mini Emergency Lamp. This Mini Emergency Lamp turns on when power fails to give cool white light in the room. It uses 1 watt White LED to provide sufficient light in the room ..
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The important part of the circuit is formed of the Colpitts type oscillator. C3, C4, C5, C6, CD1-CD2 and L1 determines the frequency. BF982 and dual gate MOSFET are active parts in the oscillator. When the input impedance of the MOSFET gate inputs are high,....
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This presence detector or proximity sensor circuit reacts in presence of any conductor object including humans. Sensitivity is adjustable with P1 which will be located at a great distance from the rest of the presence detector circuit. This circuit does not....
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This circuit was designed as an aid to installers and maintainers of video systems. It is basically a video sync separator (IC1) followed by a LED and buzzer driver (IC2, Q1 & Q2). In use, the device is connected to a video cable and if there is video....
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Ultrasonic recipients will receive an ultrasonic signal emitted by an ultrasonic transmitter in accordance with the characteristic frequency. Received signal is going through the process of filtering using the frequency band pass filter circuit, with a....
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This low-power 25 watt power inverter circuit which makes use of only 9 electronic parts. The inverter turns 10V to 16V DC input into 60Hz, 115V square-wave power output to operate AC electronic devices approximately 25W. The very first section of the 556....
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The TMS320F2812 EVALUATION BOARD is specially desgined for developers in dsp field as well as beginners. The F2812 kit is designed in such way that all the possible features of the DSP will be easily used by the everyone. The TMS320F2812 EVB board has Eight....
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This chapter contains circuit diagrams for several power supplies for pulsed solid state lasers. These include units suitable for driving the popular Hughes ruby and YAG rangefinder laser assemblies as well, one using the flash from a disposable pocket....
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Perhaps this is one of the simplest and smallest FM radio receiver that can receive the FM stations available locally. Its simple design makes it ideal for....
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Both halves of the circuit are identical. Both inputs have a dc path to ground via the input 47k control which should be a dual log type potentiometer. The balance control is a single 47k linear potentiometer, which at center adjustment prevents even....
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DC To DC Converter circuit used to be an convert voltage DC to DC with different concepts. DC to DC converter circuit +12 V to + /-20V is working to change the battery voltage from 12V DC to 20V DC voltage symmetrical. DC to DC converter circuit is often....
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This simple pc scope probe is nothing more than a fet follower. It has a high input impedance and a low output impedance tomatch a mic or line input socket on a pc or laptop. This means it is then practical to examine waveforms under test, for example logic....
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Closed Loop Motor Control Closed loop (servo) control is used to make a constant speed motor control. Constant speed means that the speed of the motor will be...
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The circuit diagram of a very simple voltage doubler using NE555 timer is shown here. Here IC NE555 is wired as an astable mutivibrator operating at around 9KHz. The base of the two transistors (Q1 and Q2) is shorted and output of the astable multivibrator....
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This acticle describes how to build a simple yet effective sound trigger for cameras or flashes. The circuit allows to experiment with high-speed photography....
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The circuit shown in the following schematic diagram is a simple spectrum analyzer adapter circuit for oscilloscopes. This circuit can be used for scanning or....
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Three factors contribute to the output symmetry. The capacitor charges and discharges through the same external resistor. An internal resistive divider sets accurate switching thresholds within the chip, the bipolar types use dividers, as well. Most....
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Annual listing of watermelon season, many people lack Yin Chi intuitive judgment raw and cooked watermelon Yun experience, often unnecessary disputes and saying this person has..
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A device which provides a USB port. If I attach it to a Windows PC it is recognized as a "CP2103 USB to UART Bridge Controller". According to the device documentation, it should communicate in serial format at 38400bps. Since the USB pinout is different from....
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In the circuit exist a simple power amplifier 60W in the 8 ohm and 80W in the 4 ohm, with components that sure exist in big quantities. It can be used in home cinema systems or in other uses. With the TR1 we regulate the DC voltage in the output of....
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This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation....
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This circuit can be used for an assist in parking the car near the garage wall backing up Pls. LED D7 illuminates Pls bumper-wall distance is about 20 cm. , D7 + D6 illuminate at about 10 cm. and D7 + D6 + D5 at about 6 cm. In this manner you are alerted Pls....
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The Intersil ICL32XX devices are 3. 0V to 5. 5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V. 28/V. 24 specifications, even at VCC = 3. 0V. Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low....
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A piezoelectric detector (BZ1) is used in this circuit to detect a change in air pressure. BZ1 produces a volt..
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All dedicated current-sense amplifiers provide high-side sensing on a positive supply, but you can adapt such circuits for monitoring a negative supply (Figure 1). The positive-supply pin, V+, connects to the system`s positive supply, and the ground pin,....
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Although it does not have the same charm as real mercury barometers with long glass tubes on pieces of carved and polished wood, the Torricelli barometer discussed here is a functional equivalent and electronic replica of the Torricelli barometer. Actually,....
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Capacitors are one of the major electronic components which come under the passive component family. These are extensively used in lectronic circuits and virtually no circuit can be built without involving these important parts. The basic function of a....
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This is the schematic of a simple 40W, 12 to 220 V inverter. You don`t believe, this is simple and cheap and working for me for last 4 years. The heart of the circuit is a CD 4047 IC which is wired as an astable multi vibrator here. Resistance and....
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This project aimed to develop a wireless system to detect and allow only the authorized persons. The system was based on Radio Frequency Identification (RFID) technology and consists of a passive RFID tag. The passive micro transponder tag collects power....
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Hi Expert, I recently receive some question on an oscillator in some AM transmitter. I searched the web and find this circuit. According to author,....
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Is a 100 to 200 metre (100 to 200yds) device having a very stable performance. It can be used as a hand held microphone or left on a shelf to pick up the sounds in a room.
It has many interesting features. These will be fully described in the article. One....
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A solar panel is, as the name says, a panel which collects solar energy and converts it to electricity. At least that`s my simple view of it. A solar panel consists of a background on which solar cells are "stuck". These cells are interconnected and....
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What is DAC Digital to analog converter (DAC) is used to get analog voltage corresponding to an input digital data. Data in binary digital form can be converted to corresponding analog form by using a R-2R ladder (binary weighted resistor) network and a....
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A variable Wien bridge provides frequency tuning from 20 Hz to 20kHz. Gain control comes from the positive temperature coefficient of the lamp. When power is applied, the lamp is at a low resistance value, the gain is high, and oscillation amplitude....
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A four channel voltmeter that displays voltage readings in a software application running on a computer. An Arduino reads the voltages, and sends them to an application written in the Processing language....
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A circuit diagram and example code to implement and use the DS18B20 temperature sensor in PICAXE both in rounded and full12bit resolution....
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In the design of microcontroller based electronics project, the use of Reset IC is critical for highly critical applications that need to ensure that the MCU will only operate at its optimum voltage. Without the use of reset circuitry, the MCU may go into a....
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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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Circuit constituted by the US0012 and P ultrasonic interference detection system is shown in Fig. When SEL40k termination high, select 40kHz clock frequency. P can use to compl..