Popular Circuits Page 142
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This high voltage white LED driver electronic circuit schematic is based on the NCP5021 IC manufactured by On Semiconductor. This NCP5021 high voltage white LED driver electronic circuit is designed with ambient light sensing feature. The NCP5021 white LED....
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The SSM2306 is a fully integrated, high efficiency, Class-D stereo audio amplifier designed to maximize performance for portable applications. The application circuit requires minimum external components and operates from a single 2.5 V to 5.0 V supply. It....
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Floating the grid above ground is bad for RF, and bad for arc protection. The control grid ground is also the single most critical connection for stability. The grid connection to ground should always be as wide and short as possible, and use as many pins as....
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The lie detector presented here has been designed to detect skin resistance and to give visual indication, verified electronic project...
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The circuit uses an IR phototransistor, Q1, to detect a remote control`s IR output signal. A PNP transistor, Q2, then amplifies Q1`s output and lights LED1. That indicates that an infrared signal has been detected by the phototransistor, or in other words,....
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This receiver uses an IR-sensitive phototransistor (Clairex, HP, etc.) mounted in a light-tight enclosur..
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This circuit in below uses the Mitsubishi M65830 Digital Delay chip. This has been around for a while now, and is simple and effective (provided that a fixed delay is acceptable). The serial data required to obtain different delay settings is not easily....
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his remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it ""hears"" the tone, there are no accidental activations....
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You need a TSOP4156 which can be a tough one to get or expensive to buy. I had plenty of old BPW41 Infrared diodes so I decided to build my own receiver. The power comes from the RS232 port, make sure you have at least 5. 5 Volts or the 4001 will not....
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Circuit shown in Figure 2-49. The circuit is very simple, cold PTC thermistor element, jump characteristic thermal resistance of the lamp to control delay time. Usually the del..
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Electronic switch ES1 connects the frequency determining capacitor to the input of clock oscillator N1. The logic level that exists at the Dm terminal of IC; is shifted towards output Q at a speed that is defined by P1, which enables defining fixing times....
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This is a glove that plays a very competitive game of Rock Paper Scissors against the wearer. It learns how they wearer plays and plays to their weaknesses. Why I`m nottotallysure. Chasing down the source of inspiration is often impossible, but sometimes a....
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This circuit shows about 1,5V LED Power Supply Circuit Diagram. Features: needed a step up transformer (40:60)easily provide. Component: IC, ....
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Using it to (hopefully) drive a 6-wire linear actuator, which will slowly push a syringe pump. The motor is a Hurst SLS custom-jobbie I got from a surplus dealer here in Silicon Valley; the label says 12VDC, 11 1/2W (which, in my newbie brain, means about.....
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By adding the same circuit parallel with this, you can increase the number of inputs according to the applications. Each input is connected to the inverting terminal of LM3900. The built in amplifier of each section amplifies every audio input separately and....
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Construct universal power supplies, including: Low-voltage power supplies for operating electronic equipment are in the next section. There you`ll find designs for single- and dual-voltage regulated supplies, including an all-purpose adjustable version and....
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Add to our circuit despreading spectrum 2 identical branches more. Difference is only in phase of PN sequences given to each branch (to input of double-balanced mixer). In EARLY branch, phase of PN sequence is earlier about ½ byte. In LATE branch, phase of....
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LED guard-rail tube has another name called beautifully the tube, it is a kind of advanced LED decorative illumination lamp decoration products. Use LED of red, green, blue 3 kinds of colors as the light source, has used microelectronics and digital....
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The two drawings using the LM324 op amp to form a lower voltage comparator, resistor R1, R1 component partial pressure circuit, the op amp A1 is set at a level U1; resistor R2, R2 voltage divider formed for the op amp Comparison of A2 to set the level U2.....
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Learning how to use power MOSFETs by building an H-bridge motor control....
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This is a complete circuit that is shown in the diagram below and is formed by a microphone amplifier built around IC1A, is a design for intercom circuit. In this circuit, there are 2 IC, LM358 that is used to low power dual op amp and 4016 or 4066 Quad....
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FIG demodulation and detection circuit is a radio, AM intermediate frequency signal IF amplifier after a two-stage detection performed by the diode Dr, the audio signal from th..
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WinCircuit is a software of realization of drawing of printed circuit in single or double layers. Principal qualities are the facility of use and the sight in pseudo 3D which gets a vision of the circuit close to reality...
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The PWM controlled modified sine wave inverter circuit presented here uses just a single 4093 for the specified functions. The IC consists of four NAND gates, out of which two are wired up as oscillators while the remaining two as buffers. The oscillators....
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Drinking fountains automatic control circuit diagram as follows: ..
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This submersible sonar positioning apparatus generally consists of dual-opposed ultrasonic transducers, alternately excited, with return signals processed and displayed for observation and measurement. Typical transmitter frequencies range from 50 to....
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This TDA2030 amplifier circuit is ideal for driving low frequency subwoofer speakers in home theater systems. The TDA2030 is a monolithic integrated circuit intended for use as a low frequency class AB amplifier. This TDA2030 amplifier design needs dual....
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In a single difference amplifier configuration, the AM-427 exhibits excellent common-mode rejection and spot nois..
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A simple SWR meter first needs a calibration to Uv = 100 % (forward power). When switching over to Ur (reflected power) the SWR is indicated. This procedure has to be repeated every time a change is made to the transmit power, antenna tuner or frequency etc.....
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Figure 1-87 is a good loudness volume control circuit, it uses an ordinary potentiometer, used element pieces are scarce, but the effect is quite remarkable. The electric road ..
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In the Fig.1, exist a circuit, which is a sensitive switch that corresponds in AC signals of input, for signals above 5mV. Corresponds in all the signals from 50 HZ until 3KHZ, region in which found the human voice. The RV1 is regulated so much what RL1 it?s....
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Here is a simple circuit of an FM booster that can be used to listen to programmes from distant FM stations clearly. This amplifier will pull in all distant FM stations clearly. The circuit is configured as a common-emitter tuned RF pre-amplifier wired....
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This can be used to convert a byte sent from a microcontroller to a analog value like say 1. 51 V. At full scale, when all 8 bits are high calibrate to give 2. 55 V then ever bit increment is 0. 01V, 10mV steps. If the eight bits inputs are from a counter....
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The supply receives -20 V from the rectifier/filter which is fed to the collector of the Darlington pnp pass transistor, a TIP105. The base drive to the TIP105 is supplied through resistor R5. The base of the TIP105 is driven from Vz terminal at pin 9,....
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This is an unusual design in that it uses plain metal gate CMOS logic instead of the usual PIC or a custom chip. The 22uF capacitor charges up during one half of the ac cycle, and supplies trigger current to the triac on both halves...
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This is a pretty simple project we are going to do. We are going to create a simple buzzer circuit where we can increase or decrease the volume of the sound that the buzzer outputs. Okay, now we can do this in two ways. We can first turn the potentiometer....
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Microcontroller BoardsPS-LPC2138 ADK, ARM Development Kit is proposed to smooth the progress of developing and debugging of various designs encompassing of High speed 32-bit MCU from NXP. The board supports NXP`s LPC214x family devices with various memory....
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Car drivers, motorcyclists despite prohibit drinking and driving, but also have occurred, in this case the circuit can be detected the odor of alcohol when. Issued a do not dri..
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Wiper Speed Control. A continuously working wiper in a car may prove to be a nuisance, especially when it is not raining heavily. By using the circuit described here one can vary sweeping rate of the wiper from once a second to once in ten seconds..
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Circuit shown in Figure 3-115. It uses contactors and double buttons, so when converting speed without press stop press ugly, can be directly converted. SBi, SBz button and SB3..
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The OpenRelief project is building open, modular information solutions for disaster relief , and as part of which they`re developing a range of network-enabled sensors. I offered to help out by prototyping a radiation detector, opting to use an ionisation....
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This is a project that I undertook during June 1996 as my final year electronics project. The entire circuit was built using individual components including logic gate ICs and and keyboard decoder IC. Since them electronics has moved on and if this was....
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This circuit detects the 20 Hz, "" 86-V rms ring signal on telephone lines and initiates action in an electrically isolated circuit. Typical applications would include automatic answering equipment, and interconnect/ interface and key systems. The circuits....
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Bad book binding circuit not shown, do the solenoid valve to control the head of the YV1 bad book is not set, no positive signal of bad books under constant conditions, the fli..
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The RF oscillator using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3.Since these inverters are in parallel the output impedance will be low so that it can directly drive an aerial of 1/4th wavelength.....
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. The FM transmitter circuit is using NPN transistor 2N2222. The L1 and C1 producess necessary oscillations Q1. The collector....
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An advanced radionics schematic to increase the power output of your tuning circuit....
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This has been the first Mosfet power amplifier of me, It is the most complete circuit. As a 60 watt power amplifier, this is sufficient for normal use in my....
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This circuit produces clean logic pulses while drawing very low current. This circuit is designed to produce short 2mS pulses at a rate of one per second while drawing only 1 micro amplifier from a 9 volt battery...
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The circuit uses an ICM7213 precision one minute/one second timebase generator using a 4.1943 MHz crystal for generating pulses counted by an ICM7217B. The thumbwheel switches allow a starting time to be entered into the counter for a preset-countdown type....
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In recent years, following CD`s introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old vinyl discs from a well preserved collection. This simple but efficient circuit devised for cheap....
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This circuit converts frequency to voltage by taking the average dc value of the pulses from the 74121 monostable multivibrator. The one shot is triggered by the positive-going ac signal at the input of the 529 comparator. The amplifier acts as a dc filter,....
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This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The....
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This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively....
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Shadow sensors are widely used to detect the movement of a person in a confined area. Many circuits published earlier have a serious drawback that only one....
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FIG potentiometer RP2 sliding contact with the axle shaft is directly connected to the antenna. Only when given potentiometer RP1 and RP2 refers in the same position, only non-..
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This very simple circuit just uses a couple of resistors, a capacitor and the easily available 555 timer IC.
The 555 is setup as an astable multivibrator operating at a frequency of about 1kHz that produces a shrill noise when switched on. The frequency can....
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DTMF (Dual Tone Multiple Frequency) is associated with digital telephony, and provides two selected output frequencies (one high band, one low band) for a duration of 100 ms. DTMF generation consists of selecting and combining two audio tone frequencies....
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There are solutions to this problem—mechanical (push On/push Off switch), electromagnetic (latching relay) and electronic (CMOS logic), but few (if any) go....
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You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16. 5V. It can deliver a current....
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The XR-T5995 Speech Network is a monolithic integrated circuit specifically designed for implementing a low cost telephone circuit.
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This lm338-v. 1power supply will be able to give something like two times 12- 36 volt and 2x5 amps (10 amps in the v. 2 of this PSU witch includes transistors to get more current from the circuit). I use 2 x lm338 in V. 1 but also lm317 can be used. I will....
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This is a simplified version of the Universal Keypad-Operated Switch. I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However, there should be lots of....
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As illustrated, 555 and R1, R2, C1 composition astable multivibrator, the oscillation frequency is about 10kHz, duty cycle close to 50%. VT2, VT3 switch as expanding the use of..
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Here is a simple USB FM transmitter that could be used to play audio files from an MP3 player or computer on a standard VHF FM radio by connecting it to an...
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This article is the compilation of small transistor circuits and configurations for beginners like current amplifier and limiter, oscillator, latch etc. Using just a couple of NPN transistors a simple current amplifier circuit can be built. Two transistors....
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With the aid of this circuit it is possible to listen, using a portable VHF FM radio, to listen to stations that transmit only your local cable network. Bo....
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Two simple circuits permit Nicad charging of a battery based on temperature differences between t..
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Here is a circuit diagram of car stereo. Below is a circuit diagram of class B 15 Watts audio amplifier is designed using a dual op-amp and transistor. The 15 W class B audio amplifier circuit shown here is a simple class B audio amplifier based onLM833 op. ..
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Astable multivibrator using too many electronic devices, widely used in the pulse signal generating circuit, which works as 17-18 in FIG. From the figure shows, with A coupling..
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The supply receives -20 V from the rectifier/filter which is fed to the collector of the Darlington pnp pass transistor, a TIP105. The base drive to the TIP105 is supplied through resistor R5. The base of the TIP is driven from Vz terminal at pin 9, which is....
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When the detect subroutine is called, it first waits for a start bit. The length of the low part of the first start bit is measured. If the low pulse of first start bit is longer than 1. 020 ms or less then 800 uS the routine returns indicating error or no....
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Cause when fast charging nickel-cadmium battery temperature, as shown in FIG nickel-cadmium battery fast charger temperature of the control circuit can be provided to detect th..
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This circuit combines a current source and a platinum RTD bridge to form a complete high-accuracy thermometer. Th..
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This light sensitive automatic light switch circuit is intended to be connected at the main 220V supply. The circuit will connect a 220V lamp at the nightf....
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Using an SCR/relay combination, this circuit can be made to cut off ignition, unless a positive voltage is applied to..
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ICi latch is used to lock the digital data clock signal rises ~ Qu holding data port AD7s23 thin film resistor ladder and c- Jing switch 08 constitute 8-bit DAC, the reference voltage ..
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As shown by the timing circuit 4h is up to 556 pairs of the time base circuit. 556 dual time base circuit intermediate access N8281 crossover network, without having to use a l..
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The rapid, widespread use of 3.3V logic circuits complicates
the selection of RS232 interface circuits. The optimum choice
of an interface circuit should be based upon several application
dependent factors:
1) Logic circuitry connected to interface chip....
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The following circuit shows a Portable NiCd battery charger ciecuit diagram. The portable batteries charger used to provide an opportunity to load ....
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Battery manufacturers recommend charging 12V lead-acid batteries at a charge voltage of 13. 5 - 13. 8V for standby, and 14. 4 v - 15v for cyclic use(charging and discharging) - but if using the latter, which gives a faster charge, you must turn it off when....
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The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the....
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This circuit is a differential analog circuit switches. The FM1208 monolithic dual differential multiplexer used in applications where the RDS (ON) must be the same match. Since RDS (ON) for monolithic dual tracks at better than 1% of the broad temperature....
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The particular circuit combines enough operations, as Smooth departure of benefit of AC line of network, with delay 1sec, to the transformers of power supply of amplifier, via the RL1 and the resistance Rx. (see block diagram). [ 2 ] Delay of connection of....
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Sometimes the output volume of amplifier is too high and hurts our ears. As well as hurting your ears, this incident could damage your loudspeaker. The circuit....
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Circuit shown in Figure 3-36. Starter contact closure is shown in table 3-1. Figure, Ul, Vi, wl and U2, vz, W2 are the first three-phase stator windings of the motor terminal. ..
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In the production field, realize the automatic detection of the water level and control a critical technology that is the industrial process control, have important meanings in the automation level which improves industrial process control. In life field,....
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The LTC3221 family are micropower charge pump DC/DC converters that produce a regulated output at up to 60mA. The input voltage range is 1. 8V to 5. 5V. Extremely low operating current (8 A typical at no load) and low external parts count (one fl ying....
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