Popular Circuits Page 185
- Page 185
-
Barrage (noise) jammer for VHF/UHF communications. Based around an old TV tuner with its local oscillator tapped and amplified. The tuner`s voltage tune line is mixed with a sweeping, random noise signal...
-
-
This very simple counter can be used to measure the frequency of various wireless devices. Applies in reviving the transmitter and its operation as a control monitor frequency. It can be used as a scale to the receiver. Due to the simplicity of the counter....
-
The Resistive Sensor Head (A2053) is a Long-Wire Data Acquisition ( LWDAQ ) Device that measures the resistance of up to eleven resistive sensors. These sensors could be 1000- © RTDs (resistance-temperature devices), 100- © RTDs, 120- © strain guages, or any....
-
The communication technique with the LCD is the same like the last lesson, and for the current experiment we have added a counter which counts between 0000 and 9999. Our counter increments with 1 second delay. /* ` * ` Lesson nr. 16: ` Alphanumeric LCD as....
-
This circuit is much more modest, but certainly still worth the effort. It provides a high quality interior light delay. This is a feature that is included as standard with most modern cars, although the version with an automatic dimmer is generally only....
-
The protection circuit output amplifiers and speakers, has some interesting features such as isolating the speaker from the amplifier output when shown a continuous trend in output or when the temperature gets too much cooler while providing a time delay and....
-
-
As shown in manpower inductive alarm circuit, simple and practical, when a person's hand near the sensing line, the alarm will send out alarm sound, which is very suitable for the male electrical burglar alarm. Induction line L is a long lo ~ 50cm of wire,..
-
-
In case of Japan, the electricity to be using in the home is 50 Hz or 60 Hz. In case of 50 Hz, the 1-cycle sine wave occurs the 50 times for the 1 second. 60 Hz are the 60 times. There is a way of making make the Lissajous as the way of understanding that....
-
Applications are given to complete the four-piece HL402 switching power supply system diagram system drive four power IGBT switching power supply system. FIG IGBT drive pulse i..
-
L1 and L2 were made by wrapping three tight side by side loops around a sharpie marker, I also made L2 by wrapping about 8 inches of 35AWG magnet wire around a ferrite core, careful to make the windings side by side and glued it in place with a hot glue gun,....
-
-
The L298N driver module contains the ST` L298N chip, ususlly used to drive two 3-30V DC motor, there is a 5V output interface, power for 5V single-chip circuitry, support 3. 3VMCU control. With it, you can control the DC motor easily. You can get the diagram....
-
Ring current generator The ring current generator can produce a ringing current voltage of 75-90V and 25Hz±5HZ. It is available to be used for vibrating ring in communication devices, for example, carrier, ultrahigh frequency, wire telephone. It can also be....
-
This house alarm circuit has open and closed loop sensor and has self shutdown function. The delay after trigering can be adjusted from 1 minute to 12. The delay before trigering is 13 seconds. Offcourse all this timmings can be change with litle changes to....
-
FIG clogging circuit wheat planter particles. In this circuit, the light-emitting diodes and photodiodes arranged in planting at the outlet - will be blocked, if blocked light ..
-
The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high....
-
The other transistor (T2) is controlled by the current flowing through the resistor (R1). If a DALI slave unit is connected, this current will be the same as that flowing through the power transistor. The value of the resistor is chosen in such a way that....
-
The Mk II was a second-generation version of the TG X 50. Both were dynamic microphones intended for bass instruments and kick drums. The primary difference between the two versions was the introduction of a passive EQ filter in the Mk II. Note that the....
-
The NESCAF audio filter is a small and low cost circuit that works great. It is a good addition to any amateur radio setup. It is especially useful with radio receivers or transceivers that lack an optional CW filter. I have made a product review of the....
-
This is the simple and easy way to tap current from a Motor Bike battery to charge the Mobile Phone. Most of the Mobile Phone battery pack has three 1. 2 volt cells making the voltage to 3. 6 volts. For fast charging of the battery pack, each cell requires....
-
Dual Channel Relay Board is a simple and convenient way to interface 2 relays for switching application in your project. Input - 12 VDC @ 84 mA. Output - two SPDT relay. Relay specification - 5 A @ 230 VAC. Trigger level - 2 ~ 5 VDC. Berg pins for connecting....
-
-
This circuit will generate a linear sawtooth between 30 Hz and 3 000 Hz. Ql is a constant-current s..
-
Common phase frequency detector can be divided into mutual coupling and capacitive coupling frequency discriminator frequency discriminator according to their coupling. Its imp..
-
A complete schematic diagram of the voice disguiser is shown. Microphone MIC1 picks up the voice signal and feeds it to an audio amplifier, consisting of Ql and Q2, and a few support components. The amplifier has a low-pass gain response that limits the....
-
-
This is a video scan converter to display NTSC video signal into VGA monitor. Normally, the VGA monitor occupies most desk top space, so that everybody will be thinking that if the VGA monitor can be used for video monitor...
-
This is the simplest possible design. The local oscillator of the receiver is adjusted slightly so that its second harmonic can be used for mixing. RF leakage from the local oscillator is sufficient to drive this crystal diode mixer, which has an output at....
-
Here exist a small collection from three generators, what using crystal for basic production of oscillations. Each generator uses different topology of circuit for the production of oscillations.
..
-
Blue VALUES replaced by values in RED. Blue COMPONENTS removed from circuit. Red components added to circuit...
-
The series of UC 3842, 3843, 3844 and 3845 Oscillators can be used to generate sync pulses which no need to have a lot of external components. As seen in the following circuit, it shows Sync Pulse Generator Circuit Diagram of the UC3842/3/4/5. This sync....
-
Here given is a circuit in which the status of the output pins of a Flip Flop IC can be toggled by using sound. A condenser microphone is used for picking up the sound. The first two op-amps in the IC1 LM 324 is used to amplify the sound picked by the....
-
The photodiode specified responds linearly to light intensity over a 100 dB range. Digitizing the diodes linearly amplified output would require an A-D converter with 17 bits of range. This requirement can be eliminated by logarithmically compressing the....
-
These photos were made in the years 1956 and 1957. On photo nr. 3, on the right, at the bottom, is the GMD. The work that was done at the objekt was of course top secret. It was strictly forbidden to talk to any acquaintance or relative about the work.....
-
This circuit will flash a super-bright LED (5000+ mcd). Good for fake car alarm or other attention getting device. Component values are not critical, try anything else first from your junkbox. Obviously, the 470 ohm resistor (R3) determines the LED's....
-
On the poles, the plane of the pendulum swing would make one rotation each day. On the equator, however, the plane will not rotate at all. This begs the question of why the plane rotates. Due to rotating reference frames and the Coriolis force, the pendulum....
-
The module provide a pre wired multiplex of 4-digit common anode LED, that`s great. See the soldering pad of these signal in the 1st picture below. I thought, my friend gave me the AT90S2313 chip, and with a simple homemade ISP cableand a free software AVR....
-
NI Multisim software offers advanced virtual instruments and analyses to help you gain a deeper and more complex understanding of the operation of your design. One of these tools, the measurement probe, can be a quick and functional interface to the....
-
An electrical signal taken from the low tension side of the distributor is converted into a voltage proportional to engine rpm and this voltage is displayed on a meter calibrated accordingly. The 555 timer IC is used as a monostable which, in effect,....
-
A VCO (voltage-controlled oscillator) is an analog circuit, so you cannot find it in the libraries for the design of digital programmable chips. When you need such a circuit for synchronization or clock multiplication, you need to find a circuit that works....
-
Supply it with a Li-Ion cell, which has 2. 7-4. 2V. I don`t really want/need the complexity of a buck/boost converter. I know I could just regulate it down to anything below 2. 5V, but it still would be great if my circuit would get 3. 3V for Input-Voltages....
-
This low power fm transmitter is designed to use an input from another sound source and transmits on the commercial FM band. This low power fm radio transmitter it is actually quite powerful The first stage is the oscillator, and is tuned with the variable....
-
The three-transistor circuit in Fig 1 costs less than $10 to build, uses commonly available components, and consumes less than 10 mA from a single 9V battery. If you wind coil L1, as the figure shows, the circuit receives signals in the 5- to 15-MHz....
-
There is great sensitivity to operating costs when dealing with high-powered commercial lighting. In these applications, there is increased emphasis on energy efficiency and ac line power factor because these parameters impact operating expenses. The....
-
-
-
Feedback Oscillator Positive feedback is used in oscillators to maintain running or oscillating. An oscillator is basically an amplifier which has a feedb....
-
Tested all the resistors and noted 2 resistors` readings were out compared to the other channel (i. e.1. 2Kohm vs 2. 2 kohm). Based on the color codes, should be 2. 2kohm. THought I spotted the problem, repl the "1. 2kohms" with new 2. 2 kohms but the....
-
The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two “1 of 8 line decoders“74HC138 or 74HCT138) to generate the popular Nigh....
-
This is the DC switching regultor Voltage 5V at current 3A. It is make for digital circuit. The important part of the circuit is LM2673, it is 3A Step-Down....
-
A faster driver can supply higher peak gate current to switch the VN64GA very quicklyThe circuit uses a VMOS totempole stage to drive the high power switch..
-
This circuit can switch two or more devices on and off in response to a series of rapid handclaps. The claps are picked up by an electret microphone and a....
-
-
This circuit provide automatic current limiting up to 8. 4A. Unlike current limiter that uses only a resistor, this current limiting circuit doesn`t drop the voltage, or at least keep the voltage drop at minimum, until a certain current amount is exceeded.....
-
The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency....
-
-
The schematic for this charger is pretty simple. GellCell Battery Charger: circuit to charge a Gell Cell or other lead-acid type. This simple battery level monitor circuit can indicate the charging process in 12 Volt Lead Acid battery or Tubular. 12V battery....
-
This article reviews basic servo systems and development of the fault-tolerant feedback systems for servo systems. Controller receiver circuit design, proper PC-board receiver circuit layout, and the encoder`s signal cable and termination are discussed.....
-
The system is designed to regulate an 860 watt lamp load from half to full power. This is achieved by the controlled-half-plus-fixed-half-wave phase control method. Half power applied to an incandescent lamp results in 30% of the full light output..
-
The ding-dong electronic doorbell circuit is composed of the power supply circuit, trigger control circuit, audio oscillator output circuit, and it is shown in Figure 3-125. Power supply circuit is composed of the power transformer T, rectifier diodes....
-
This circuit depends on the entry of a correct sequence code. An incorrect number that is not part of the code causes the circuit to reset. When the correct code is entered, Q2 operates relay K1 for a short time, depending on C3. ..
-
Rw a77s power is the use of integrated circuit fabrication Ji-day double touch light switch, a special circuit point J. Cases the same. Bong electromechanical source transformer T Buck, v]) 1-VD4 rectifier..
-
A self-interrupting device connected to a voltage source functions as a switch that repeatedly open..
-
This circuit for multiplying the width of incoming pulses by a factor greater or less than unity is simple to build and has the feature that the multiplying factor can be selected IYJ adjusting one potentiometer only. The multiplying factor is determined....
-
The above table is useful to determine the capabilities of the MOSFETs for the various versions. However, the connectors I have used on the LED3X "c" series is not rated for such high currents on a continuous basis. The connector is technically rated for 7....
-
-
The DC input for this charger ic operates from 4. 15V to 16V with up to 20V protection, while the USB input has a range of 4. 1V to 6. 3V with up to 8V protection. ..
-
Manufacturers have recently introduced high-performance analog-to-digital converters (ADCs) that feature outstanding static and dynamic performance. You might ask, "How do they measure this performance, and what equipment is used?" The following discussion....
-
-
Control your instrument with a 4x20 LCD display and 4x5 keypad designed for front panel feedback and control....
-
A friend takes an interest to want to try build hi-fi power Amplifier the some one. He likes model class AB, because the sound is good. keen bass good distinct. I chooses this circuit gives him sees, be power Amplifier hi-fi OCL 120W rms sizes really, if use....
-
2 Tone Door Bell here published is verified project produce ding-dong sound circuit diagram of 2-tone door bell with description.various door bell and alarm project ...
-
As shown below, this circuit uses BP01-type pressure sensor and op amp MAX4472.BP01 type pressure sensor is specifically designed for the detection of blood pressure, mainly us..
-
-
I need to make a small 4-10 second (changeable) delay circuit that pulses a cell phone vibrational motor every 0.75 seconds. I`m using a 9 volt battery. Could anyone....
-
-
Development of the whole system required an exhaustive identification of all processes of the laser controller. I started with this diagram which outlines the major physical components that will be used for the cnc laser. The laser has a power supply, a....
-
The PA output Pi section consists of 2 variable Cs (20 - 120pF and a second (home made) 50 - 450pF switched in for the lower bands by a simply modified 12v power relay). The anode choke (200t, 24swg 5" long on 1" dia PTFE tube stock) is mounted directly onto....
-
Function: to increase or decrease the time constant with the capacitor, which increases or decreases the ramp time. Component: Transistor, Capacitor, Resistor, ....
-
-
This basic VFO for the 3- to 6-MHz range is coirimonly used in amateur applications, using a Colpitis circuit. For 5 to 5.5 MHz, C = C2 = 70 pF and for 3.5 to 4.0 MHz, use 1000 pF. C3 is typically 10 to 220 pF, depending on the frequency. C4, C5, and C6,....
-
average vending machines are commonplace at railway stations, airports, fast-food restaurants and even in companies. Press a switch and the machine delivers a cup of your favorite drink. This looks quite a simple operation but has a very complex logic behind....
-
From This simple projects If you want circuits with special features,can be set the program to the circuit works, when the input pluse signal is entered of....
-
I have made a major correction to the schematic as a result of getting a second board going. The manual sweep circuit should return to ground not vref. I also increased the feedback limiting resistor from 100K to 270K. This area of the circuit might bear....
-
Care must be taken to eliminate any stray currents from flowing into the current summing node. This can be accomplished by forcing all points surrounding the input to the same potential as the input. In this case the potential of the input is at virtual....
-
L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit. ) With their C7, C8 we adapt the resistance of aerial....
-
-
Large-value capacitors are required for this experiment to produce time constants slow enough to track with a voltmeter and stopwatch. Be warned that most large capacitors are of the "electrolytic" type, and they are polarity sensitive! One terminal of each....
-
-
This simple circuit can give regulated 4. 7 volts for charging a mobile phone. USB outlet can give 5 volts DC at 100mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone batteries are rated 3. 6 volts at 1000 to 1300....
-
At 9 volts the maximum stalled current of the motor types I`m going to use will be 700 mA. Since I`m not real experienced with this I want to check that I`m choosing good mosfets, I`m pretty clear on the rating, they say what current and voltage they can....
-
-
Controlling your door lock through your personal cell phone was never this easy. Learn how to build a simple electronic circuit that will help in converting your ordinary door lock into a high security door lock which can be now controlled through your own....
-
The Z3816A is a GPS disiplined timing source that was manufactured by HP in the middle 90`s. It was intended for use in cellular telephone equipment. It provides 10 output signals through sma connectors on the back panel. 1 PPS - from the 4 connectors on the....
-
The circuit is an inverter set up as a linear amplifier. Adding the· crystal and capacitors to the feedback path, we turn the amplifier into an oscillator and force it to oscillate at, or least very near, the crystal"s resonant frequency. Trimmer capacitor....
-
Kids these days seem to have most things you see in the toy shops, so if you have a son or grandson who has a collection of cars, here is something he wil....
-
Electronics Tutorial about the Monostable Multivibrator Circuit also known as a One-shot Monostable Multivibrator used as a Pulse Generator Circuit....
-
These two circuits provide bias for the microwave preamps shown in this text. The circuit in Fig. 51-5(a)..
-
Openbench Logic Sniffer is an open source logic analyzer. It`s designed to support the SUMP logic analyzer software at the lowest possible cost. Download the source and design files from the Gadget Factory project page. This project started in the comments....
-
This slideshow is based on the LEDs Design Ideas Collection, a collection of LED-related reader submitted circuits and design applications that have appeared in EDN`s `Design Ideas` section. Here you can browse through the circuit schematics in that....