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As shown in FIG adaptive adjustable power supply. The power supply to the LM317 regulator device, adaptive switching circuit automatically switches the input voltage according ..
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As shown in FIG by DN-41 consisting of high-current switching regulator. DN-41 features overcurrent, overvoltage (crowbar) protection circuit, a reset circuit, soft start circu..
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As shown in FIG grounds ISO124 and MC78L05, an external regulator MC79L05 and DCP011515 constituted improve power supply rejection ratio (PSR) circuit. Input signal VIN (maximu..
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As shown in FIG grounds efficient, low-power output voltage boost DC-DC converter MAX761 and a few external components, the adjustable power conversion. Its output voltage is d..
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As shown in FIG grounds efficient, low-power step-up DC-DC converter MAX761 and a few external components, the + 5V + 12V boost power supply. Its characteristics are: the conve..
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As shown in FIG suitable for use in high-efficiency single pager battery power boost. It is composed of a MAX1678 and three external components. MAX1678 is designed for l to tw..
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As shown in FIG. 3 ~ 6V a practical adjustable power. The power supply to the integrated voltage regulator 5G14 core plus 3DG12A transistor current spreading, constitute an out..
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As shown in Figure as a + 24V, 1.9A power supply circuit. It 5G14D domestic integrated voltage regulator as the core, three external power transistor, output current from the p..
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As shown in Figure as a switching power supply to work with linear regulated power supply. Its characteristics are: high efficiency, low dropout; having the ability to filter o..
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As shown in Figure it is a temperature compensated with a negative voltage to follow the positive changes in the symmetrical voltage integrated power supply. This circuit is ch..
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As shown in the low-cost dual output voltage regulator circuit consists of two pieces Micrel companys MIC29150-12 and MIC29150-5.0 regulator constituted. ..
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As shown in the zero-power regulator circuit is simple, reliable and able to work. It is suitable for all kinds of electric power adjustment appliance, series wound motor power..
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As shown when the power supply is 0 to 1 hour, set the AC circuit diagram 555 constituted within one hour timer, J 212 IRC MR312C relay coil impedance, or current of less than ..
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As shown, the diode IN4148 series in V + and loop to prevent line damage due to reverse device in the loop loss only 0.7V (silicon diode forward voltage drop) of the power supp..
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Automatic AC voltage regulator circuit ..
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Automatic AC voltage regulator circuit TXD1742 continuous adjustment ..
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Boost 3.5V regulator circuit With this chip can boost or build stable voltage supply to V ~ 3.V DC voltage into a DC voltage of 3.5 V, ..
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Both circuits are applicable only to have overcurrent protection power supply. ..
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By the old I *, jh;, ililiiit; NE555 circuit implementation and other child member, NE555 1yj complex I end (6) feet. Set bit Vr: {2) feet Ding electrical equipment connected s..
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By the transistor VT and regulator vsl etc. constant current source, and the use of three regulator, the regulator circuit therefore of high pulp. ..
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By the transistor VTa, VT4, sense resistor Ro-current protection circuit and other components. The power supply after overcurrent or short-circuit fault is eliminated, can not ..
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By the voltage equation Ue Ut + Ur + Ua shows that the size of the transistor voltage Ut will determine the maximum output voltage Ua. At the same time there should be Ur 2V. U..
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CO2 gas shielded arc welding power supply electromagnetic vibration circuit C02 gas shielded arc welding electromagnetic vibration, vibration welding abbreviation commonly used..
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CS3843 and CS5101 constituted by the output of 5V/3.3V switching DC power supply circuit as shown in FIG. CS3843 is a fixed frequency PWM controller. The IC is characterized by..
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CS51227 constituted by the output of 28V/5A DC power supply circuit as shown in FIG. CS51227 is a voltage type PWM controller, its switching frequency up l.0MHz, starting volta..
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Capacitor step-down DC power supply circuit Shown is a capacitor step-down DC power supply circuit. This circuit eliminates the need for power transformers, capacitive voltage ..
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Cars are fixed as shown in the circuit composed of LM723 regulator circuit, it can replace the use of an automobile generator system consisting of electromechanical charging re..
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Circuit diagram for the DC power supply protection circuit. The device consists of buck rectifier power supply, monostable delay circuit, relay control circuit, audio feedback ..
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Circuit output current capacity and bulk capacitors Cl, and when the Cl o. 7vtF changed when 2pF, the output current can be increased at each end lOmA around 20mA, as determine..
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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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Circuit principle: This circuit uses three-terminal adjustable integrated voltage regulator, S gear set, the power supply voltage via a step-down transformer 17. 5VX2 alternati..
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Circuit shown in Figure 3-171. The figure, the auxiliary power supply is single-phase AC power, the single-phase half-wave controlled bridge (diode VD7, VD8 and thyristor vl, V..
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Circuit shown in Figure output voltage + 5V, output current of 1.5A power supply. It consists of power transformer B, a bridge rectifier circuit D1 ~ D4, filter capacitor C1, C..
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Circuit shown in Figure secondary N3 center tap and transformer T common point diode VD2, VD3 positive and capacitance C2, C6, C7 and negative electrode capacitance C9, C10 and..
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Compilation dial phone numbers with 15 commonly used libraries (plus number dialed) are stored in a standard CMOS RAM, one button keypad makes typing a phone number can be dial..
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3-wire interface to the AD7714 can be equipped with a variety of microcontrollers (including microcontroller or microprocessor). 3-wire serial interface is particularly suitabl..
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51 microcontroller has a full-duplex serial communication port, so you can easily serial communication between the microcontroller and the computer. When the serial communicati..
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Circuit works as follows: Computer logo conditioned clamor control circuit shown in Figure 1-58, the main chip AT89C52 microcontroller with Levin. Switched power source when, 2..
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Cookers detection control circuit The control circuit shown in cookers for testing. Inductance coil disc lesion is generally about 150 pH. Stove plate coil and capacitor resona..
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Cookers pot quality detection circuit Shown as cookers pot quality detection circuit. Pot quality testing is by disc lesion induced voltage (EMF) to achieve. ..
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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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Drawing, transistors constituting the gate VTi, VT2, VT3 and the like. ..
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Constituted by a circuit block diagram MAX1463 precision pressure detection system as shown in FIG. Bridge pressure sensor output voltage connected to the MAX1463 IN1 +, IN1- e..
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Consisting of integrated analog multiplier MC1596 synchronous detector as shown in FIG. The demodulated signal may be any amplitude modulated signal from the integrated circuit..
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AD7714 Typical application circuit is shown in Fig. UDD, UDDA end of the AD7714 can be connected to + 3V or + 5V power supply...
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As shown for the detector circuit multiplication. The circuit is a single-sideband amplitude modulation signal detector, its principle is to demodulate the received single sideband (SSB) and the receiver to recover the signal transmission..
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Headphone type detection circuit according to the figure attached. Figure, 2.2k RMIC-BIAS resistor connected to the audio controller provides a low noise reference voltage (VMIC-REF). When the audio jack is inserted, VMIC-REF voltage through RMIC-BIAS..
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After TT2 off, the input signal input via chi Az, dry white [input resistance is very high, becomes the same potential, the inverting input terminal must also be associated wit..
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Analog switches alternately pass, off the input signal by the low pass filter to make pulsating flow smoothing (removing pulsating become DC). OP Xiao Ai is an enlarged buffer ..
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As shown for the bandwidth of 10MHz broadband linear detection circuit. The circuit is the bandwidth Millivoltmeter measuring instruments, such as used above 10MHz of broadband..
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As shown for the simple adjustment of the high input impedance double wave linear detector circuit. The operational amplifier circuit by the negative feedback loop to compensat..
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As shown in FIG grounds ISO122P/124 and loop current transmitting circuit XTR101, isolated RTDs loop current configuration of the receiving circuit RCV420 4 ~ 20mA loop detecti..
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As shown in FIG photoelectron pulse missing detection circuit. The detector consists of optoelectronics slotted switch H13B1, dual time base circuit 556 with some RC components..
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As shown it is one for the 10GHz frequency amateur radio waveguide detector. ..
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By the three current transformers Current detection signal obtained after rectification, filtering the output of the three DC voltage, are applied to the transistor VTi, VT2 an..
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Cadmium sulfide photoresistor CD1 fingertip can be detected through the filter, CD1 form the sense amplifier feedback network, a part of the sense amplifier ICA produces weak s..
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Capacitive proximity controller usually consists of a radio frequency oscillation circuit and a detection plate. Figure 6-56 is produced with discrete components capacitive pro..
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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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Examine a traditional Hartley oscillator circuit, and you`ll note its trademark: a tapped inductor that determines the frequency of oscillation and provides oscillation-sustaining feedback. Although you can easily calculate the total inductance required for....
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The I.F. amplifier is similar to the one used in the 80M receiver project . The original design has been modified by putting a couple of LED`s in the source circuit of each Mosfet. The voltage drop across the LED`s keeps the source voltage at about two....
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This is a series regulator with Q900 being the control ele-
ment, Q901 a driver, and Q902 an error amp. ZD900 forms
the emitter reference voltage source. Since the generated
high voltage and other voltages are linked by means of
the magnetic field of....
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This circuit was used to stop all the BFO drift. The circuit is extremely stable. Turn the receiver off, and then on at any time and temperature, the BFO frequency is exactly the same. The resonator is a Murata CSB 455E. Murata's series number is CSBLA_E....
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A Hartley oscillator is shown at the right. It uses most of the same components as the Clapp oscillator. A capacitor is necessary to block the gate bias voltage from the tuned circuit. The tuning capacitor is a 100 pF poly capacitor. L1 is a coil wound with....
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Hand and body motions in proximity to the sensing antennas produce frequency changes in a Hartley oscillator operating at approximately 750kHz. The signal from this variable oscillator is mixed with a constant reference frequency in a ring modulator and the....
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This simple circuit uses an incandescent lamp to detect airflow. With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As air flows over the filament it cools down, thus....
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Catalytic bead sensors are used primarily to detect combustible gases. They have been in use for more than 50 years. Initially, these sensors were used for monitoring gas in coal mines, where they replaced canaries that had been used for a long period of time...
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I designed up this circuit board because of a request from a visitor to my website. I also assemble the circuit board to Varify the board was correct. It does work, VERY NICELY, but I have no way to varify the accuracy of wind flow that is stated by the....
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We are OUT OF STOCK on the surplus brushless DC motor we used to build this project, and since it`s surplus we cannot get any more. The resistor and capacitor values listed in the schematic and on the PC board plan depend on using this exact same motor...
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This application note describes a low-cost circuit that can detect when a chassis fan filter has become clogged
with dust. It does this by using a temperature sensor to determine the rate of cooling of a transistor in the air
path of the cooling fan,....
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A gas sensor (from Allegro electronics, Cornwall Bridge, CT06754 Ts GS823) in the presence of explosive gas turned on. U5 is a voltage to frequency converter, and a sensor whic..
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Air compressor (compressor) is commonly used in electrical equipment factory, generally controlled by the electrical contacts. Circuit shown in Figure 5-1. Circuit automatic an..
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Air compressor control circuit, the circuit principle analysis of pumping at play: When the overload protection function (1) When the motor thermal relay FR long-term overload,..
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As shown below, it is a circuit diagram of a portable gas detector. The portable gas detector circuit is used mainly in electrochemical sensors, dual-channel micro-power amplif..
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As shown for the driver circuit high pressure natural gas shut-off valve, the device 01 for the solid state relays. When the engine is in dual-fuel mode of operation, the opera..
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As shown in FIG alarm by a buck rectifier and voltage regulator circuit, gas sensor, comparator circuit and sound the alarm circuit. Buck regulator circuit by a transformer rec..
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As shown in FIG alarm by a gas-sensitive sensor element QM, buck rectifier and regulator circuits, integrated circuits KD28, speaker Y and other components. Gas-sensitive senso..
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Based integrated circuits and relays KA constitute humidity alarm value it uses pA741 circuit. MS01 using a wet-type humidity resistance element as a probe. When the humidity e..
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Boil water or cook with gas stove, it is sometimes due to water spills extinguish the fire mission, if not found to cause a lot of gas bF overflow occurs risk of poisoning. Thi..
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CH217 monolithic gas, gas gas detection alarm integrated circuits, and gas detection alarm circuit diagram R1 is the gas sensing probe, the resistance increases just gas concen..
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CMOS clock circuit can drive a multi-digit gas discharge display, simple circuit does not include an alarm, which can be flashing colon morning and afternoon show. The circuit ..
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Ceramic gas sensors can also be used to analyze the content of alcohol vapor. With the corresponding sensor circuit can be detected with a blood alcohol content. Its working pr..
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Combustible gas alarm circuit is shown. Circuit by the gas sensor, multivibrator and audio output roads. Multivibrator integrated circuit by the NAND gate way inside two NAND g..
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About twenty five years ago, an inventor friend of mine showed me some illustrations in a college physics book. The book was one of a three volume collection of physics lectures given by the noble prize winner Richard Feynman. The book illustration was very....
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The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate the relay placing his hand on the card,....
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Common designs for touch switches detect a decrease in resistance when a user`s fingertip either connects a contact to the circuit`s common ground or supplies an injection of 60-Hz ac voltage, resulting from immersion in the electrostatic field that nearby....
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This is a very basic infrared detector/emitter circuit. One major downside of this circuit, is that ambient infrared light will interfere with its detecting obstacles...
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This Design Idea involves a low-power motion-detector circuit that operates from battery power for extended times. Part of the design includes a solenoid-operated trip mechanism that triggers whenever it detects motion. The drive circuit for the solenoid in....
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D switch S location function. FIG microphone to a speaker on behalf of the (also designed a door using an electret microphone) port channels through C9 send people IC2 amplify ..
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A single hand clap will be picked up by the electric mic which is coupled through C1 into the op amp IC1. The output of IC1 triggers the 555 IC timer IC2 which is configured as a monostable multivibrater. The trigger pulse is stretched by IC2 and outputs a....
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With all the holidays upon us, understandably some of us will be drinking alcoholic beverages. This circuit can be used as a guideline how much you have had to drink and how good your reaction time is. This circuit does not tell you whether you are over the....
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The modern mechanic switches are improved concerning of old technology. We need however many times to replacement some old switch or to check currents bigger than the durability of certain switches or simple we need something with modern appearance. For he....
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A simple circuit with which we have the possibility opening and closing the RL1 contacts. He becomes touching a small metal surface. Clue of situation that is found RL1, is become by the Led D3. The supply of circuit is +12V, the IC1 is supplied with 3.9V....
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One of the unusual features of the out-of-production Programmable Drum Set was its use of touch switches for control. Like most touch switches, these detect the difference in the capacitance of a plate when it is being touched by a finger versus the....
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This is a circuit thich I originally included in my book, 22 Tested Transistor Projects, published by Babani Press in 1976 (ISBN 0 900162 63 S). It is one I had great fun with. It uses the PUT Complimentary Feedback Pair as a sensitive detector of changing....
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The circuit on the right uses three bipolar transistors to accomplish the same result with the touch contact referenced to the negative or ground end of the supply. Since the base of a bipolar transistor draws current and the current gain is usually less....
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? simple heart-beat transducer can be made from an infrared LED and an infrared phototransistor. ?t works because skin acts as a ref1ecti?e surface for infrared light. The lR ref1ecti?ity of one's skin depends ??? the density of blood in it. Blood density....
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Dctl is a two-stage amplifier, the first stage amplifying transistor VT1 collector voltage U..
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Diagram 2 shake tube n. Capacitance C. Trigger voltage rectifier filter element. H is a trigger voltage transistor amplifier circuit, three pull tube n, U, v. Composition trigg..
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8 ohm output for connecting communication receivers and 8 ohm speaker or low impedance phones, harmful interference suppression continuous random voice transmission. Passband 3..
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After the power is turned on, 220V AC by the step-down transformer T, VDI ~ VD4 bridge rectifier and Cl filtered output of about 10V DC voltage for the Darlington circuit and s..