Popular Circuits Page 217
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Turn on a "black box" of leds (that operates at 8-9v) when my motion sensor is activated. The problem I`ve got is that the output of my PIR is only 3. 3 volts. Here is my crappy schematic. There are a few things that need to be fixed. First, A resistor is....
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A design for a phantom antenna power-supply system compatible with the Digital Satellite Equipment Control (DiSEqC) communication standard, using the MAX16948 automotive dual, high-voltage LDO/switch. The presented application circuit provides a remote....
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The circuit has a frequency response that ranges from 100 Hz to 3 MHz; the gain is about 30 dB. Field-effect transistor Ql is configured in the common-source self-biased mode; optional resistor R1 allows you to set the input impedance to any desired value.....
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When this circuit is connected to a filter and an oscilloscope, the scope displays the filter`s frequency response. A frequency that sweeps from low to high is applied to a filter. An oscilloscope is triggered by* the start of the sweep and ends its trace at....
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This application note describes how LEDs (including white LEDs) work. The note also explains how to drive them in battery-powered LED applications, including lithium-ion (Li+ or Li-ion), nickel-cadmium (NiCd), and nickel metal-hydride (NiMH) rechargeable....
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The circuit provides complete, linearized signal conditioning for a platinum RTD. This LTC1043 based circuit is considerably simpler than instrumentation or multi-amplifier based designs, and will operate form a single 5 V supply. Al serves as a....
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The circuits looked at so far depended for their functioning on linear feedback. The magnitude of the signal returned to the negative input was always strictly proportional to that of the output voltage. The result was that within the limits set by the....
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Circuit principle : circuit after transformer, bridge rectifier and conditioning on the battery charge, the charge current transformer can be adjusted simply give about 12v 100..
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Band pass filter allows only signals within a certain frequency range pass through rather than the pass band lower frequency than the upper limit of the low and high frequency ..
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This is a circuit intended to be used in basketball shot clock.Notes:To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable multivibrator but must be....
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This page shows some methods of track routing control for Stall-Motor type switch machines. The principle method uses a 2 Pole - Multi Position rotary switch while an alternate uses optoisolators and transistors to select the routes. The last circuits on....
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This is a continuation of the article An AVR microcontroller based Ethernet device. The hardware is still the same (ENC28J60 + atmega88). The software is now updated to provide also a web-server. That is: instead of using a command line application and send....
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This circuit is so sensitive it will detect "mains hum." Simply move it across any wall and it will detect where the mains cable is located. It has a gain of about 200 x 200 x 200 = 6,000,000 and will also detect static electricity and the presence of your....
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Ever accidentally left your front door ajar and had a pet escape? Here is a smart solution to this problem. The circuit is fairly simple but a great exampl...
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This simple flashing light circuit is powered with 6 volts/0.5A and has a low current consumption when the light bulb is off. The flashing frequency is set....
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For many applications it is necessary to delay signals. Just think of applications in automation and control systems. Such a signal delay circuit can be set up with two monoflops....
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This circuit controls resistive and inductive loads up to 2, 500W. It`s main functional device is an integrated phase control circuit - Siemens TLE3103. It contains its own power supply, a zero voltage crossing detector circuit and a logic driver. An....
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A wide range of low-power industrial sensors and controllers are turning to alternative sources of energy as the primary or supplemental means of supplying power. Ideally, such harvested energy will eliminate the need for wired power or batteries altogether.....
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The signal from a synchro receiver or a variable resistive cam follower (potentiometer) is boosted by operational amplifier Ul, whose output swing is limited by back-to-back zeners D3 and D4. The signal is then applied to operational amplifiers U2 and U3,....
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This circuit consists of two identical intercom units. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circuit. Only 2 wires are required to connect the units together. Due to the low output....
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The reference current is fed from the supply voltage via Rl, to the inverting terminal, and the variable (noninver..
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The guitar input stage is a class A amplifier with adjustable bias. A 2N3906 PNP tranistor is used for a low noise design on this stage. The output of the preamp stage is sent to three places: the output mixer amp, the reverb driver amp, and the input....
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LM311 is a comparator, It operates from single 5V supply or dual supplies, input current 150 nA, 50 V-50 mA output drive capability. TTL-CMOS compatible output. The Output is open collector so it can sink current but cannot source, a totem pole output can....
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This Open Source thread is for the advancement of a ""Mosfet Heating Circuit"" one that is a modified replication of one....
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If you re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whether someone rang while you were out. Of course, you can t tell whether it was the visitor you were....
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The Car Voltage Gauge is based on 3 parts. The input circuit is an Analog to Digital Converter (IC2 CA3162E). The purpose of this chip is to sample an analog voltage and convert it to a decimal value which is read by a Display/Decoder Driver (IC1 CA3161E).....
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Many a times one needs an extra telephone ringer in an ad joining room to know if there is an incoming call. For example, if the telephone is installed in the drawing room you may need an extra ringer in the bedroom. All that needs to be done is to connect....
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Shown for the WS157 or WS106 with low power miniature switching power supply. WS157 or WS106 is newly developed in recent years a regulated switching power supply control device, the internal control circuitry and power switches integrated on the same chip,..
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A very simple single-phase brushless DC motor drive electronics items, you can use a DC brushless motor driver NJU7365 New Japan Radio Co., Ltd. by the IC design. NJU7365 is a ..
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The first timer is used as amonostable and determines the tone duration when triggered by a positive pulse at pin 6. The second timer is enabled by the high output of the monostable..
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This is a great contribution to the ongoing study of the lock control module, including instructions and photos of how to upgrade the module to reduce its standby current consumption for increased battery life. Assumes that you are slightly competent with....
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This circuit uses invisible infrared light to detect the movement of people through the door. A short beep will be generated when the infrared beam breaks ..
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This is my student assignment for the class "Designing Microprocessor Based Instrumentation". The board demonstrates the use of 12-bit ADC, writing c program with digital filtering and interface the LED display. The reading provides 0. 1C sensitivity. The....
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The circuit is built around a 4049 hex inverter (Ul), a pair of 555 osciliator/timers (U2 arid U3), two transistors, a Geiger-Muller tube, and a few additional support components. The first 555 (U2) is configured for astable operation. The output of U2 (a....
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The Laser Head (A2074) provides drive circuits for one or two laser diodes. The drive circuits provide fast switching from off to full power, while at the same time providing complete protection of the laser diode from over-drive. We turn on the lasers by....
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The circuit is using a 230V AC OR 110V AC to 9V-0-9V step down center tapped transformer to step down the mains voltages. Four 1N4001 diodes are used for rectification of the AC voltage to DC. A 2200uF / 25V electrolytic capacitor is used the filter the....
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The Over-the-Top type of operational amplifier is ideal for use as a current sense for battery charger applications. The design described here can be used with chargers for rechargeable batteries (Lead/acid or NiCd etc). The 5 V operating supply for the....
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This is door knob touch alarm for your home security purpose. The alarm will be activated when someone touch the metal door knod. This circuit wont work on full metal door. Download the schematic drawing This is door knob touch alarm for your home security....
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This circuit operates from a 16- to 50-V supply. Adding the buffer circuit (within the dashed lines) offe..
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The ESR Meter is basically an AC Ohmmeter with special scales and protective circuitry. It provides a continuous reading of series resistance in electrolytic capacitors. It operates at 100 kHz to keep the capacitive reactance factor near zero. Here`s the....
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Ideally, any testing equipment will not draw any current from the device under test. This ideal condition can be approximated by designing a testing device....
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This circuit provides an FM modulated signal with an output power of around 500mW. The input Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset. The oscillator is a colpitts stage, frequency of oscillation governed....
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A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer. A single pole double throw sitch is used to switch between inject and trace modes. The....
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This circuit is a general-purpose 10-W audio amplifier for moderate-power PA or modulator use in an AM transmitter. With higher voltages and a change in bias resistors, up to 30 W can be obtained...
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Phone alarm device can monitor and prevent unlawful misappropriation of your telephone line. When someone in your telephone line and the machine thefts from outside the alarm on the issue of interference signals, so thieves can not dial, and the light was....
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Energy-saving lamps are divided into self-ballasted compact, single-ended from the structure; from the appearance divided double-tube type, tube type four, six tube and tube ri..
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Choosing the right DC motor is critical when building mobile robots. Testing DC motors is an easy process and can be done by building a simple DC motor circuit. All that is required to build this circuit is a DC motor, a battery power source of at least 3 V,....
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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 terminals will NOT do. The Alarm is set by pressing a single key. Choose the key you want to use and....
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The SM5023 series are 3rd overtone crystal Oscillator module ICs. They feature built-in Oscillator capacitors with excellent frequency response. As cutoff frequency CAN be congured by using an external feedback resis- tor Rfo, a favorable 3rd overtone....
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Readers who do not care to modify the power supply of an old PC into a suitable halogen power source (see our April 2006 issue), may find the present desi....
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This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level. It should be mounted on top of the recipient (e.g. a plastic tank) by means of two crocodile clips, acting also as....
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I had designed up an oscillator with a Power Output circuit. Problem was when power was applied to the entire circuit, the output of the Oscillator gave a Momentary Spike into the output circuit. Thus Driving it full on for a split second. This Circuit....
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This is a circui for audio frequency meter. This circuit uses 555 IC as a mono stable multi vibrator (one-shoot trigger). A mono stable multi vibrator can act as a frequency-to-voltage converter because it produces a fixed pulse width, with the repetition....
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The best way to get a sense for space-charge tubes is to study some real circuits. Look at the online circuits listed below, and see if you (or one of your friends) have any of the older print articles listed after the online articles. That done, choose a....
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A pair of thyristors in a controlled full-wave bridge configuration provide a 100Hz rectified supply. This is smoothed by an active smoothing circuit to give a DC supply of 1. 56V. The thyristors only conduct for a short period when they are triggered in the....
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This circuit is used in computer RS-232 serial interface and current loop circuit interface, it can transform voltage singal into 20mA current singal, the maximum transmission rate is 1200 bits. CCD IC1, T1 form receiver interface circuit, T2, T3 constitute....
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This circuit is used IC number NE555 set up to stable multi vibrator. It produces a frequency rectangular patch of about 100 Hz. Out to pin 3 through C3 and C4. Before the rectifier power section. Both positive and negative DC 2 series. Positive power supply....
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The following circuit shows about Power Amplifier Electronic Circuits-Tube Audio RF Amplifiers Circuit Diagram. This circuit based on the LM324 IC ....
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To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable multivibrator but must be calibrated for real time clock. The PAUSE SW must have a Switch....
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Many applications require low-frequency signal generators that can deliver high-performance, high-resolution signals. This Design Idea presents a circuit that generates frequencies of 0 to 1 MHz. Sinusoidal, triangular, and square-wave outputs are available.....
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The most essential accessory for astrophotography, after a camera, scope and mount, is a remote shutter release to reduce vibration. A remote control is even more useful if it can trigger a series of exposures at preset intervals and of preset duration. With....
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The SC9256 is phase-locked loop (PLL) LSIs for digital tuning systems (DTS) with built in 2 modulus prescalers. All functions ate controlled through 3 serial bus lines. These LSIs are used to configure high-performance digital tuning system. By Silan ..
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The camera rotator circuit uses a 2716 EPROM to store a table of logic values that control the motor driver (H-bridge) circuit. The EPROM data is shown in the schematic. By using the EPROM, a large number of discrete gates are eliminated. The logic table is....
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XP-power plug, FU-fuse, ST-temperature control, T1-low-voltage transformers, S1, S2-door interlock switch, S3-threshold control switch, RT-thermal sensor, K1, K2-relay, EL- furnace light, M1-wheel motor, M2-fan motor, T2-high-voltage transformer, C-high....
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Design and Dimensioning of Aktive Low-Pass and High-Pass Filters. Sallen-Key and Multiple Feedback Topologies, Spice Netlist Generator....
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Feedback - This is where part of the output signal is fedback to the input BUT 180o out-of-phase (i.e. partially cancels the input). If it were in-phase feedback then we would have an oscillator - which in this case we definitely do not want. Fidelity - This....
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Five-stage amplifier Q1-5 amplifies both control signals, 38. 285 kc and 41. 805 kc, while Q6 and Q7 operate as class B detector-amplifiers to eliminate need for separate diode detectors. Desired control frequency energizes only one coil of double-fulcrum....
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You need not be disappointed next time when your digital camera shows low battery indication during a picnic trip. Just plug this digital camera adaptor into the cigarette lighter outlet of your car and connect the camera to it. The adaptor will interface....
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This circuit shows a Wiper Speed Control Circuit Diagram. Sweeping rate of the wiper can varying from once a second to once in ten seconds. This ....
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During the first half-cycle (Fig. 99-5(a)), Dl conducts, D2 cuts off, CI changes to 170 V peak, and C2 discharges through ..
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This circuit changes the gain of opamp U1B in four steps or segments. It can be used to get a linear output from most transducers to 1% levels. U1A is a amplifying buffer use it to boost the signal to the required level. The resistor values i have put are....
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Square wave generator using uA741. Circuit diagram, theory and working principle....
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It is a very simple data logger project based on PIC12F683 microcontroller. The microcontroller reads temperature values from a temperature sensor on a regular interval basis and stores them into its internal EEPROM memory...
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This electronic circuit diagram is an audio power amplifier based on TDA8571J integrated circuit, class-B output amplifier with four amplifiers in a BTL configuration, each with a gain of 34 dB. Main features of the TDA8571J amplifier circuit are : high....
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ASSP For Communication AN12979A AN12979A is the stereo BTL Amplifier which contained the AGC circuit for clip prevention of a speaker output. 2 This IC performs a mode change by the I C bus control system. (Standby function ON/OFF change etc. ) By Panasonic....
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This stereo balance indicator circuit diagram is designed using few common external components. The schematic circuit is very simple to build and will provide an visual indication with LEDs for left, right and center balance. Outputs from each channel are....
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As shown in FIG constituted by RF2126 2450MHz end-stage linear power amplifier circuit. Radio frequency (RF) signal from the input pin 1, after amplified by the amplifier 7 fee..
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This project I made for my little daughter. It is 24 channel light illumination. The schematic is very simple ? 24 LED?s, 1 MCU and some additional components. The main principle is dynamic indication, which is usually implemented for control of 7-segment....
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A compact and portable 12V Solar power inverter circuit that will keep away darkness. This tried and tested design converts 12V DC from the storage battery...
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The H-bridge is a circuit used in electronic control of high current devices, particularly where the device polarity may be reversed, e. g. DC motors. The name comes from the fact that the circuit typically looks like a letter "H". The circuit shown has four....
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Six preset controls and seven selector switches enable a vast range of different sounds to be produced and altered at will. Such sounds as steam trains chuffing, helicopters flying, bird chirping, and machine guns firing are possible, as well as the usual....
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This is an easy to build X-Y oscilloscope. To try this an ATmega324P and two KAD0820 (same as National Semiconductor`s ADC0820 ) were used. Originally this oscilloscope was built around an AT90S4414 hence the external AD converters. Some rose and Lissajous....
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This circuit is basically tbe classic bucking regulator, except it uses a TMOS N-channel power FET for the chopper and creates its own supply for the gate control. Tht unique aspect of this circuit is how it generates a separate supply for the gate....
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Hi!!! What is the frequency (through Low Pass Filter) recomended for the contrast of a LCD? I want to control the contrast of a LCD with the PWM of a....
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Based on the classic Baxendall tone control circuit, this provides a maximum cut and boost of around 10dB at 10KHz and 50Hz. As the controls are passive, the first transistor, Q1, is configured as common-collector to act as a buffer stage. The last....
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A fully parametric tube EQ and my best bet seems to be `merging` these two schematics into one so that i can get a tube-based gyrator section (with adjustable Q, Freq and Gain) and use ICs for the input and follower stages (going to use this on a home-built....
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Today may of our appliances come with displays and buttons. Instead of motors and gears, many household items today have embedded Microcontrollers. We are going to explore how we can experiment with Microcontrollers at home....
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The EMEM2 was invented by Dan Tracy. In a conversation with "Doug", the inventor of the large coil device, he commented that the EMEM2 does kill Lyme disease and that it is a lot of machine for the money. It has also been demonstrated to be useful for many....