Popular Circuits Page 139
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A circuit for monitoring supply voltages of ±5 V and ±12 V is readily constructed as shown in the diagram. It is appreciably simpler than the usual monitors that use comparators, and AND gates. The circuit is not intended to indicate the level of the inputs.....
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and C code for a frequency counter circuit operating up to about 50MHz using a multiplexed seven segment display and uses timer 1 to count edges of the input signal....
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Usual already a bicycle has will no Light turning. If want to turn a car may be born dangerous can go up. Because of a car that drive to follow come to don`t know that turn thus. We should enhance the safety gives with one self with building light turning....
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This circuit will trigger with any fluid with a resistance under 900K between the maximum separation distance of the probes. Let me explain further. The circuit uses a 4050B CMOS hex buffer working on a 5 volt supply. ..
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The circuit diagram given here is of a stepper motor driver using MC3479 from Motorola. The MC3479 is specifically designed for driving a 2 phase stepper motor in bipolar mode and is available in standard DIP and surface mount packages. The IC is compatible....
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The wiring diagram for the clock and radio screen illumination for a 1999 mercury sable with a 3. 0L vin U. I have searched for hours on alldata and MichellOnDemand and have found absolutely nothing. Please help! I don`t know if it matters, but the vehicle....
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This circuit is an improved version of the Fig. 3-28 display, using a triangular-wave oscillator. With RA properly set, each incremental change in VIN can be detected because the glow from each LED can be made to spread gradually from one device to the next.....
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I recently needed to control nine seven-segment displays for a microcontroller`s serial port. The complication I faced was the need to provide a continuous brightness adjustment for all the digitsfrom completely dark to fully bright. I couldn`t easily use....
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A digitalmultimeter is a very useful instrument that combines several measurement functions in one unit. A typical multimeter includes features of a variable-range ohmmeter, voltmeter, and ammeter. Some of them also include capabilities of testing diodes and....
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The schematic show that the AccelR8 only uses 3 IC`s. An AVR 8515 microcontroller do the calculation work and controls the other circuits. An MAX603 controls voltage and power-on/power-off. And the chip that makes it all possible, the ADXL202 from Analog....
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Circuit is very simple and straightforward. Two inputs are added just to give an idea of input control and software denouncing. An ATMEL Micro-controller AT89C2051 is used to control the LED glowing one by one to give the effect of running light. A 12 M Hz....
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Many published circuits that flash LEDs need 3 volts or more. This circuit uses only a single inexpensive C-MOS IC and flashes the LED for a full year on a single 1. 5 volt AA alkaline battery cell. The circuit uses a charge pump technique to provide the LED....
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The first circuit, shown below, tests saturated turn-on time, while the second circuit tests saturated turn-off time for a 2N2222 transistor. Note that the first circuit schematic takes the output from the collector, which is pulled high to Vcc. While the....
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Integration of 1200V SOI gate driver ICs into a medium power IGBT module package A novel approach for medium power....
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The schematic diagram below circuits 5V/1A Step-Down Switching Regulator using LM2524D Regulating Pulse Width Modulator (PWM). You may see the parameters, PC board layout, stuffing diagram and more in the LM2524D datasheet..
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Hello to everyone! How I can control these graphical LCDs with a microcontroller? Is there any datasheet?....
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A teardown of a BK Precision 4011 5MHz function generator a few weeks ago. Like most of basic function generators in old days, BK 4011 does not offer frequency sweep as an option. What it does include is a VCG (Voltage controlled Generator) input, which....
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This circuit creates a stunning display of the "magic" of magnetism by suspending a small metal object in mid air. Using an electromagnet, photo sensor and closed loop control, small and light metal objects can be floated just underneath the magnet, enclosed....
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This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must....
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Dye lasers are unique in that they are a class of lasers whose lasing medium is a liquid. Depending on the particular dye used, output can be at a wide range of wavelengths spanning the visible spectrum and beyond. Commercial dye lasers are often pumped by....
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This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone. The dial tone we heard when we pick up the phone set is call Dual Tone Multi-Frequency, DTMF in short. The name was given because the tone that....
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As shown, the circuit consists of a dual time base circuit 556 consisting of two synchronized multivibrator, two output clock..
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You may find that there are too few, if your power is very noisy (as can happen in a car environment) it may help to place a 0.1uF and/or 10uF capacitor before and/or after the voltage regulator. At the moment I`m not using these but at this point I`ve only....
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A very simple and interesting project / schematic of a cell phone signal activated LED circuit. The circuit will light up an led when you call from your cell phone....
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The circuit is a preamplifier with digital regulation intensity of sound. He is separated in three departments. In first schematic (Fig.1), is found the circuit of control of electronic potesometer. The control become from two pressing switches. The S1 (UP),....
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Circuit shown in Figure 3-85. Manual and automatic control through the transfer switch SA. After starting the motor Mi, to start. Automatic start sequence by time relay KT to a..
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This thermometer is capable of 0.01°C accuracy over - 50°C to +150°C. A unique trim arrangement eliminates cumbersome trim interactions so that zero gain, and nonlinearity correction can be trimmed in one even trip. Extra op amps provide full Kelvin....
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They implemented it in the higher frequency L band 1452-1492 MHz whereas EU, AU and GB are in VHF Band III (174-230 MHz) anyway it failed for whatever reasons, and thanks again for trying the APP. Mickz your app works perfectly here but I get no dab....
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This is a audio-controlled lamp circuit. This circuit requires low voltage input such as pre-amplifiers, tone control, or general audio line level output. It`s...
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This circuit requires physical connections be made to the computer`s serial port (COM1 or 2). To the best of my knowledge, it is difficult to cause damage to yourself or your computer by improper connections to this port, but there is no guarantee that....
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If you`ve ever wanted a high-voltage generator to create neat lightning effects, perform Kirlian photography experiments or play with neon lights, then this one is for you!. " We will describe a laboratory pulse generator using an auto-ignition coil and....
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The operation of the circuit is fairly simple. Three AND logic gates of a 4081 CMOS IC are employed, with gates IC1a to IC1c being configured as a standard cascaded latch circuit. S1 to S3 serve as reset switches. The output at pin 10 will only switch to....
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Figure 1-102 high-pass filter in FIG. (A), and if we take C1 C2, R1 1/2, then the crossover, H 1/2 root of 2 R1C1. For Figure (b), if take C1 C2, R1 1/4R2, its crossover fH 1/2..
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High Power Siren Circuit This article is all about a comparatively strong siren circuit useful for any purpose. A complementary transistor pair (BC 557 & 337) is arranged as an oscillator, directly drives the speaker. Transistor Q1(BC 557) is used to provide....
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All ATL-3 loop windings are centre tapped and balanced w.r.t. their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel. Magnetic noise fields,e.g. televisions and the electric meter box, or....
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This small circuit can be used to control model railway turnouts operated by AC voltages. A logic level in the range of 5 12 V can be used as the control signal. The coils of the turnout are switched using triacs. Changes in the logic level of the input....
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I decided to throw together a schematic of how the OEM AUX switch should be wired, and print it so that when I install the wiring I would have a handy reference. Figured I would post it. Here is another breakdown of the switch pins, keeping in mind that....
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This circuit is a Mosfet-based linear voltage regulator with a voltage drop of as low as 60mV at 1A. The circuit uses a 15V-0-15V transformer and employs an IRF540 N-channel Mosfet (Q1) to deliver the regulated 12V output. The gate drive voltage required for....
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By adjusting one potentiometer, this circuit`s output can be varied from a positive-going version of the input signal, smoothly through zero output, then to a negative-going version of the input (see the figure). If the input signal is a positive pulse of,....
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The circuits incorporate two FM Demodulator TDA2555 systems to perform the Demodulator functions required in a dual sound Carrier TV system for demodulating the sound Carriers The difference between TDA2555 and TDA2557 is the number of stages of the Limiting....
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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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I have had a few inquiries about a low power FM transmitter, and this article should satisfy those who might want to build one. It is designed to use an input from another sound source (such as a guitar or microphone), and transmits on the commercial FM band....
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This chapter deals with the operation and circuitry of transistor oscillators. In general, these fall into two categories: the feedback (or vacuum tube equivalent) types, and the negative-resistance (or current multiplying) type. Transistor oscillators are....
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An old ignition module from a 1978 W116 model Mercedes-Benz, and I`m trying to "reverse engineer" it. The original circuit diagram is not available to mere mortals, so I have made one based on the PCB itself. I believe it is, beside being ugly, electrically....
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It`s a simple metal detector design that has the quite good characteristics. the principle of operation which one differs from the classic schemes (BFO, transmit-receive known as "two-boxes" metal detector, inductive). The dynamic mode is used to find....
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The following circuit shows about 1.5 V Lead-Acid Battery Charger Circuit Diagram. Features: comparator s output controls the voltage regulator, ....
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On board the AVRs that can be programmed are those in the schematic. For other members of AVR family or the rest programmable ICs that Ponyprog can program, there is the J1 connector (CON10) which allows expanding the programmer`s hardware. See Ponyprog`s....
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This time on we Will Share About Yo3dac Homebrew Rf Circuit Design Ideas Latest Info at Onmilwiki....
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The circuit behaves like a zener diode over a large range of voltages. The current passing through the voltage divider R1-R2 is substantially larger than the transistor base current and is in the region of 8 mA. The stabilizing voltage is adjustable over the....
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220V AC by Ri buck, Diao!. C1 chain ferry flood ear, shouted for the regulator to l2V make [C collapse. The film hand touch under ridicule the MT electrode films, clutter body ..
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Have you ever wanted to run a TV, stereo or other appliance while on the road or camping Well, this inverter should solve that problem. It takes 12 VDC and steps it up to 120 VAC. The wattage depends on which tansistors you use for Q1 and Q2, as well as how....
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Ql is used as an oscillator around 300 kHz. R9 is set so that the oscillator just begins to run. An object ne..
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A very useful expansion board for our PIC development board. It will be a Do It Your self (DIY) LCD Expansion board. The expansion board can be plugged into the PIC development board to add 16x2 Alphanumeric LCD Support to it. Since LCDs are required in many....
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In a monostable multivibrator, one of the state is absolutely permanent i. e, stable and the other one is temporary i. e, quasi-stable. When an external trigger pulse is applied to the mono-stable at appropriate point, the mono-stable changes it state from....
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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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Circuit as shown by the two and four decimal counter CD4017 password switch composed by the output terminal of the key switch logic combination of components to another feature of the electronic code switch. ..
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12dB/oct Butterworth second port (most flat characteristic) of the filter circuit value is pregnant shall be 0.707 to get the characteristic flat, and for cl, the feedback capa..
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This circuit allows you to turn on your holiday bulbs with a wave of the magic wand. The strings flash in sequence. At the heart of the idea is the magnet....
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As shown in Figure 8 times the low-pass filter circuit. This circuit uses eight low-pass filter circuit switched-capacitor configuration. Changing the cutoff frequency of the c..
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LED is the most interesting part of amateur electronics hobbyist. The main barer of LED is, it needs minimum 3 vlots to illuminate. I`ve found many circuits to drive LED by a single cell alkaline or manganese cell. ..
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Here is the circuit of a very simple transistor tester which used two LEDs for displaying the condition of a transistor. Both PNP as well as NPN transistors can be tested using this circuit. Quad 2 input CMOS NAND gate IC CD4011B is the heart of the circuit.....
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BEAMers tend to learn quickly how to scavenge parts needed to build their projects from technoscrap. But there are always going to be times when buying new parts and/or materials will be necessary. This is getting to be case even more so, as "Application....
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This circuit turns a common oscilloscope into a versatile eight-channel display for direct voltages. The trend of each of the eight input levels is readily observed, albeit that the attainable resolution is not very high. The circuit diagram shows the use....
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This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days....
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Because the power controller is powered from the vehicle`s accessory switch, the load can receive power only when the ignition key is on. Using half of a dual flip-flop (CD4013), a load of up to 10 A is controlled by a momentary pushbutton. This circuit was....
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This tachometer lets you measure heartbeats, respiratory rates, and other low-frequency events that recur at intervals of 0.33 to 40.96 seconds. The circuit senses the period offm, computes the equivalent pulses per minute, and updates the LCD accordingly.....
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This circuit uses the low power ICM7555 (CMOS 555) to generate the gating, STORE and RESET signals. To provide the gating signal, the timer is configured as an astable multivibrator. The system is calibrated by using a 5 M potentiometer for Ra as a coarse....
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This technical note is focused on how to determine the system specification of a CDMA receiver in order to establish a practical specification for a low noise amplifier and down converter....
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The power supply was built into the base of the mic which can lead to hum issues despite the on-board potentiometer that acts as a `null`. This also means that the mic has two cables running from it - one for power and one for audio. Both mics use two-stage....
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This circuit uses a 556 to first generate a low frequency square wave, that is modulated to produce two alternate tones of about 400 and 500 Hz. Circuit generates warble alarm of European emergency vehicles. ..
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This is a very easy circuit that every one could make and have fun. This project popped out of nowhere, one day that i was trying to control the TV from the serial port of the computer. It took me no more than a few minutes to understand the simple method....
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The schematic shows the design of a circuit that senses the resistance of the skin and converts it into a useful switching signal. The touch switch contacts can be made from two small metal plates, rivets, nails, etcetera, which are placed close together on....
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A Cmos Based Motorcycle Alarm Circuit This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automaticall....
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These two resistors have two functions. One, if I touch the circuit by accident, they limit the current to a lower value. Two, when the flash fires, the main capacitor looks like a short circuit to the power supply. These two resistors limit the short....
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This can be. increased readily by fitting a resistor in parallel with Ra, until the output voltage is5. 0 V precisely Switches S1 and Sz are preferably SPDT types with a centre position, but three-way rotary switches should also do if in both cases the....
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The Wien-bridge sine-wave oscillator uses a light bulb to stabilize its amplitude. The circuit in Fig 1 doesn`t have a light bulb; it sports several enhancements that lower its distortion and generate a test signal pure enough for testing modern op amps and....
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Figure 3-25 is a hybrid having four input preamplifier, in the circuit, cZ1, cz, C23 and cz4 respectively, can enter the microphone, line, phono and crystal head signal. Quad c..
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220V AC after VDI ~ VD4 bridge rectifier, the output of a point, all the way to direct electricity for lights H1 ~ H4; another way through Rl buck, VD5 regulator, about 5v DC o..
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CA3140 is the 4.5MHz BiMOS Operational Amplifier with MOSFET inputs and Bipolar output. This Op Amp combines the advantage of PMOS transistors and high vol....
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A Motorola TCA5500 or TCA5550 can provide a stereo preamplifier system with tone controls. This circuit provides a gain of about 10X, a 14-dB tone-control range, a 75-dB volume control range, and it can operate from 8 to 18 Vdc. IC2 provides 15 V for ICl,....
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This touch-actuated switch stays on as long as you keep your finger on the touch plate. Rl sets the input impedance to a high 22 MO. Ql picks up stray signals coupled through your body to the touch plate and amplifies them to tum on Q2, which turns on lamp....
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A basic circuit to trigger an SCR is shown in Fig. 67 -lA. This circuit has the disadvantage that the blocking voltage of the photon-coupler output device determines the circuit-blocking voltage, irrespective of higher main SCR capability. Adding....
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This circuit features automatic Exit and Entry delays - timed bell cut-off - and system reset. It has provision for normally-open and normally-closed switches - and will suit all of the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape,....
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This circuit a simple analog multiplier, the circuit operation may be understood by considering A2 as a controlled gain amplifier, Analog Multiplier, Multiplier Circuit, log-antilog circuit, analog multiplication, controlled gain amplifier, summing junction,....
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RF is just way too cool not to use in your designs. But if you`re a newbie like me it is difficult to successfully build solid RF transmitters and receiver....
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This power supply based 7805 IC regulator, it can provides a regulated output voltage of between 5 V to 15 VDC, it is adjusted and set by a preset resistor. Maximum output current range of this power supply is 350 mA, its enough to supply powered calculator,....