Popular Circuits Page 137
- Page 137
-
10 minutes to 2 hours: 100 lines bell - 20 Ogawa, when selected by the multi-gear stick lemma Ge S2 41f system. IC} is self-excited multivibrator. 1C, the ..
-
-
A very simple and useful electronic bell circuit can be made using this schematic circuit diagram. This electronic bell circuit can be used as an doorbell or even for an alarm circuit . This electronic bell circuit use just few transistors and other few....
-
1C is SK - 2 integrated voice, when the object hit the sound is received in the body Xi ester cylinder MIC, the audio signal goes through a coupling obstacle to 1C. After ampli..
-
Millimeter-wave frequency bands are attractive for their wide available bandwidths. There are a number of ways to generate these signals but, for each type of oscillator, it is desirable to be able to tune the source electronically, as well as in a defined....
-
The principle is that the resistance of metals increases at higher temperatures and a heated wire suspended in a gas will lose heat by conduction and convection in proportion to the number of gas molecules present; the heat loss is thus proportinal to....
-
This is a simple visual indication of the audio level signals, adaptive to various user needs. Can be adapted to different input levels, adjustable by trimmer TR1 (state) - TR2 (Gain), then rectified by diodes D1-D2 (standard negative mark-recovery periods)....
-
-
A very simple water level controller circuit based on 555 IC and 6 transistors. A relay is used for switching the pump motor....
-
This Mark3 version of the Infra Red extender is a special version designed to control appliances that use high frequency modulated IR remote controls....
-
This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring if it conducting ac....
-
The circuit uses easily available components. Most of the coils are wound on low cost balun core. The circuit uses ladder filter. Filter is build around four numbers of 4.43 MHz crystals. I used ladder filter because it is cheap and getting reasonably good....
-
Design A Low-Cost 4- To 20-mA Receiver Circuit For Control Loops | analog-to-digital converter (ADC)...
-
-
Supervisory circuits normally monitor a microprocessor`s supply voltage, asserting reset to the IC during power-up, power-down, and brownout. In this way, the circuit ensures that the supply voltage is stable before the microprocessor boots, thus preventing....
-
This project is designed to program the 8-pin PIC12c508A and 18pin PIC16F84 microcontroller chips to support the projects we have designed, however it will also program a number of other 8-pin & 18-pin microcontrollers and the full list can be seen when....
-
-
Even though this CW transmitter circuit was published in 1955 in Popular Electronics, it is still legal for today`s Amateur radio operator. Portions of the 40-meter and 80-meter bands are still reserved exclusively for CW operation. As of 2011 in the....
-
Transient overloads are not short circuits but can push the power supply above its nominal load value. This scenario occurs with typical loads such as printer heads and small motors. When facing such a load profile, the power supply can easily trigger its....
-
The reason being is that I would like to use the sensor as a force sensor. I noticed that the harder I press it, the higher a voltage it delivers (but for a very short time). This is expected behavior, of course. What I am wondering is how I would connect it....
-
The power supply takes its power from a 24-volt VDC wall wart either via N1, an on board connector, or via N10 an off-board connector. The power switch is either mounted on board or off-board via connector N2. The fuse can either be on board at F1 or off....
-
Implementing tactile (haptic) feedback in consumer-electronic devices enhances the user ’s experience. It provides a sense of touch in a user-interface design and is the newest major interface on smartphones and other portable consumer-electronic devices.....
-
-
This circuit allows a 240V mains appliance to be controlled remotely via low-voltage cabling and a pushbutton switch. The mains appliance (in this case, a light bulb) is switched with a suitably-rated relay. All of the electronics is housed in an ABS box....
-
-
The circuit uses a dual operational amplifier IC, the 1458, which is a single IC package that houses two individual op-amps. In this circuit, the first op-amp is used as a voltage follower whose output is used to charge the capacitor C1 through D1. As such,....
-
This post provides the LCD interfacing code using PIC16F84A microcontroller. This code is written in C language using MPLAB with HI-TECH C compiler. You ca....
-
The RW line is the "Read/Write" control line. When RW is low (0), the information on the data bus is being written to the LCD. When RW is high (1), the program is effectively querying (or reading) the LCD. Only one instruction ("Get LCD status") is a read....
-
The controller is a prototype and works well in my plane with 7 cells and a Graupner-Speed 600...
-
A popular project among microcontroller aficionados is to build a radio-controlled clock. Tiny receiver boards are available, with a pre-adjusted ferrite antenna, that receive and demodulate the DCF77 time signal broadcast from Mainf lingen in Germany. DCF77....
-
As space is at a premium here, I`m using a small 6V battery and dropping the voltage down by 1.2V to 4.8V with the diodes D1 and D2. The PicAxe chip....
-
The lithium battery charger introuduced in the example can charge 6V-plated ion battery in constant-current way and change into constant-voltage chagre mode when the battery reaches 4·1V. Work Principle of the Circuit This lithium battery charger circuit is....
-
Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high. With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz. Supply voltage may be anything....
-
Battery voltage indication circuit Using this circuit can change the status display, if foot plus a further transistor drive LED, the battery voltage is normal. LED is not lit,..
-
This 5. 1 surround amplifier circuit schematic use the IC AN7168 as the main component from this circuit. Minimum voltage required 12V and maximum voltage 24V, I recomended it 12 V because the voltage support on are components. But if you want to better a....
-
The circuit is very simple and inexpensive. This is good thing because most commercial stepper motor controller ICs are quite expensive. This circuit is built from standard components and can easily be adapted to be controlled by a computer. If you use cheap....
-
The servo motor is designed as one kind of traditional motor. It is the execution component of the automatic device. The most important feature of the servo motor is the controllable feature. When there is the control signal the servo motor turns, and the....
-
This circuit can cause a cassette recorder to automatically tum on and record when a sound or noise is present. Another use, is when the sound-activated switch is used to tum on a cassette player so that it operates as a burglar-alarm detector and sounder.....
-
The electronic switch is composed of the CK-4 type magnetic control switch and the VT1?R1?R2. When the bathroom door closes, the permanent magnet ZT and the reed pipe GA get close to separate the two touch tablets of GA, VT1 cuts off, pin-2 of IC has the....
-
Common emitter amplifier circuit resistance and capacitance coupled basic ..
-
-
If you do not have EAGLE, you can download a full working version from CadSoftUSA Here is a zip file with the EAGLE schematics an....
-
Software, Applications and Programming Resources. Amateur Radio and Travel. Stereogram Art....
-
This circuit shows about Go-No/Go Tester Circuit With 555 Timer IC. Features: more advanced unit with a precise timed testing procedure. ....
-
It is a resistance tuned oscillator covering from 35 cps (frequency unit was the cycle at this time) to 35, 000 cps in 3 ranges. The major problem with such a resistor / capacitor tuned Bridge is to obtain a constant level output over a full decade frequency....
-
This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful....
-
Most audio amplifier systems must have preamplifiers with many different characteristics. These include high-gain linear response for magnetic microphones, low-gain linear response for tuners, and high-gain RIAA equalization for magnetic phone cartridges. To....
-
The PTB78560x is a series of 30 W rated isolated DC/DC converters, designed to operate from a standard 24 V or 48 V telecom central office (CO) supply. Housed in a 12 package, each model has a wide-adjust output voltage that CAN be set to one of the common....
-
The intent of this article is to demonstrate a basic optical LED wireless link for transmission of high definition (HD) S/PDIF digital audio streams. Circuit designs for both the transmitter (optical modulator) and receiver are presented using inexpensive....
-
These circuits are similar to that of Fig. 5-47, except that the circuits provide for FM or sweep modulation. Use circuit 5-50A for FM (small deviations, about ±10%). Use circuit 5-50B for a sweep range of 1000:1. As a guideline, the sweep frequency....
-
Want to send your audio information via a light wave across the room I built this simple circuit with some modifications that transmits an audio signal via light. The signal simply amplitude modulates the light intensity (aka AM) of a LED and a receiving....
-
Hartley Oscillator Tutorial and the theory behind the design of the Hartley Oscillator which uses a LC Oscillator tank circuit to generate sine waves....
-
Circuit consists of 1-2 MHz oscillator Q1, untuned mixer X1, and AF beat-note amplifier Q2. C4 is calibrated to read directly in frequency from 1 to 2 MHz, using accurate unmodulated RF signalgenerator. After calibration, unknown RF signal input frequency is....
-
This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car`s LED light show. The Q1 amplify the audio from mic. The R1 is used....
-
Apart from the obvious usage as a headphone amplifier, the circuit can be used for a range of applications where a wide bandwidth low power amplifier is needed. The circuit is based on an opamp, with its output current boosted by a pair of transistors....
-
The first section of the 555 timer is wires as an astable oscillator with R2 and C1 setting the frequency. The output is available at pin 5. The second section is wired as a phase inverter. That output is available at pin 9. Resistor R3 and R4 keep output....
-
Understand how come the LED will not light up as the Capacitor looks like it`s by-passing the switch. When the capacitor is full, it doesn`t transmit/conduct electricity You`ll notice that I`m very beginner, but after 20 hours of reading various tutorials, I....
-
Call letters stored in 8223 PR0M U3 drive 74151 multiplexer/data selector U4 for keying NE555 audio oscillator U5 which feeds transmitter mike input through RA. Timed holdoff keeps identifier from being rekeyed within spedfied time period, with reiden.....
-
The Shay is equipped with flickering ashpan and firebox lights. These are simulated with LEDs. The red and yellow ones both flicker, the red ones stay on about 2/3 of the time and the yellow ones 1/3 of the time. The effect is pretty good while it is going,....
-
Installing a water depth OEM sensor that is a solid state, continuous fluid level sensor. The sensor provides a resistive output that is inversely proportional to the level of the liquid: the lower the liquid level, the higher the output resistance; the....
-
This value can change due to the switching frequency, environmental conditions, and desired reliability level, therefore it is recommended to check this with the actual load. The upper limit of the ambient temperature is the maximum temperature that can....
-
A complete guide to tackling those difficult electrical system tests in today`s cars. The ultimate resource for getting rid of that check engine light! Get info from a professional technician today!....
-
-
Ding for the circuit principle: care, vs SCR trigger grounded, it is in the off state. When someone leads A burglar broke, the SCR trigger end to give a trigger voltage is turn..
-
This simple metal detector requires only a handful of components and an evening's work. Built around a cmos4011 IC, is very robust and versatile. The 250 kHz reference oscillator is built with two gates (U1/1 and U1/2), C1, R1 and P1. The search oscillator....
-
A designer often needs to know the value of the internal resistance of a battery. Quite a few testers gi..
-
Combination of common-source grounded emitter amplifier A combination of common-source grounded pole radio amplifier. Common emitter amplifier input impedance in the range of l..
-
A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller. The circuit described here is for a general purpose device that can control DC devices which draw up to a few amps of current. The circuit....
-
This circuit is a frequency meter, low cost. It covers region 1HZ until 1MHZ. The IC1 schmitt trigger that it regulates the signal of entry and him changes in reasonable level suitable for the IC2-3-4. With the tenth pulse in the entry of IC2/1, is produced....
-
To connect it to the ATMEGA168, I followed the suggestion from the datasheet: the buzzer if driven by a 2N3904 NPN transistor and a diode protects the transistor from reverse currents from the magnetic inductance. /* Setup PB1 as an output */ DDRB =....
-
The following demonstrates a power saving circuit that pulses a Sensor for 1 second every 30 minutes. Designed to monitor levels of salt The Sensor shown is an Optocoupler with an infrared-emitting Diode Designed to monitor the level of salt Crystals in a....
-
Here is a crude but efficient tricky charger for Lead Acid Battery. It uses a 12 volt car bulb as current regulator and charge status indicator. The bright....
-
The technique applies to highpass filters. You derive a composite highpass filter by using m-derived terminating half-sections with one or more constant-k interior full sections. Classic image-parameter design used m-derived half-sections with m=0.6 for best....
-
The 2N2222 circuitry is a three-element, phase-shift oscillator circuit, designed to yield a 1,000-Hz sine wave. The 1,000-Hz sine wave is then applied to the TCG-610 varactor diode, 6 pF at 4 V, which changes the tank capacitance, thus varying the rf....
-
Transistors Q1 and Q2 amplify the incoming signal, and the gain is such that the input will overload when used with an electric guitar. RVl adjusts the amount of feedback present, and hence voltage gain. The output is, therefore, a squared version of the....
-
6V to 220V Inverter Schematic. Starting from 6-Volt input on the DC current into 220-volt AC output....
-
Constantly changing light and sound analog controller circuit 05 ..
-
This simple circuit provides a solid-state equivalent of the electromechanical latching relay (see the figure). What`s more, the switching is clean, highly resistant to vibration and shock, and isn`t sensitive to magnetic fields or position. The circuit....
-
-
-
This is a set of plans for an inexpensive, high performance digital logic probe that you can build in a few hours. It is small enough to use a plastic ball-point pen as a chassis, giving it a personalized touch and added style. The main advantage of this....
-
This is a very basic circuit for flashing one or more LEDS and also to alternately flash one or more LEDs.
It uses a 555 timer setup as an astable multivibrator with a variable frequency. With the preset at its max. the flashing rate of the LED is about 1/2....
-
-
This easy electronic buzzer circuit built based on timer works for gaining the frequency. The IC timer NE 555 used as astable multivibrator operating at about 1kHz and produces a sound when switched on. The sound frequency can be adjusted b....
-
This site contains public-domain schematics for a dual-trace, triggered oscilloscope, and some theory. Click on the topic in the table below to see the schematic for that block. I designed and built this oscilloscope in 1986 using the chassis of a....
-
This simple circuit drives 6 LEDs in `Knightrider scanner mode`. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version)..
-
Hi all, i`ve recently bought the dantimax thatmic pre amp and i was wondering if anyone could point me in the right direction to install a vu meter....
-
This is a little transmitter that could be put into a plastic Easter egg. It delivers approximately 1 W of measured rf output into a 50-0 dummy load, and creates no heating problems with the circuit. The crystal is a series fundamental type, and the power....
-
A timer (LM555CN) and decode counter is used to generate duty cycles from 10% to 100% to control the time a heating system can operate. V2 is a decode counter that can be switched from 10% to 100% duty cycle. V3A and form a latch that drive Al, LED1, and....
-
-
analog-to-digital converters (ADCs) | printed-circuit board (PCB) | microcontroller or digital signal processor (DSP) | total-harmonic-distortion (THD) | ignal-to-noise ratio (SNR)...
-
-
This 3A charger was originally designed to work with small batteries like those used in motorcycles. In principle it
can be used to charge car batteries also but will take a lot longer.
The charger below charges a battery with a constant current to....
-
Zetex Semiconductors have a siren driver IC Type ZSD100 available that is suitable for use in alarm systems for cars and model craft. With the addition of only a few components as shown in the diagram, the device produces an ear-splitting s Zetex....
-
A lot of friends ask me a circuit AUDIO MIXER, for various uses. I will begin with a circuit which you can it manufacture, as you want. This you can place in the MODULES of inputs any circuit you want, depending on the use that you intend the MIXER, the same....
-
A simple X-band radar detector is capable of indicating changes in rf radiation strength at levels down to 2 mW/cm2. Radiation falling on the detector diode, produces a voltage at the input of an amplifier whose gain may be adjusted to vary the range at....
-
But the idea is to apply this code to other projects with 7 segment displays that I might do later. if you want to learn a bit more of 7 segment displays you can read more at this post I`ve made. ..
-
Designing and building a breadboard power supply for myself, which draws power from an ATX-like SMPS (Mains in, single Molex plug out) via a 4-pin Molex connector. The design includes a switch to select either 12V or 5V output, but the only appropriate....
-
The amplifier"s gain is nominally 20 dB. Its frequency response is determined primarily by the value of just a few components-primarily C1 and Rl. The values in the schematic diagram provide a response of ±3.0 dB from about 120 to over 20,000 Hz.....
-
A resistive voltage divider is used to establish a bias voltage for the input (Pins 2 and 3). The demodulated (multiplex) FM signal is fed to the input through a two-stage high-pass filter, both to effect capacitive coupling and to attenuate the strong....
-
This handy breadboard header for ATTiny 25/45/85 microcontroller is a new design based on the original idea from Tinkerlog. Maybe the most useful feature is that it can provide power to the vertical breadboard strips while connecting all six port pins to the....
-
Dynamic‚ip-‚ops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to capturing noise pulses having unknown durations and magnitudes. Anyone who has ever tried to observe very....
-
This circuit be Simple Metronome circuit model to be simple. It use the transistor be important equipment by very the circuit is the character Astable Multi vibrator. For produce something the sound beep. By can fine VR1 for get sound tone Generator follow....