New Circuits Page 91
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This is schematic diagram of a video amplifier circuit, built based very high speed opamp IC LH0032. Parts List: R1 = 15K ©+15K © R2-3-4 = 10K © R5, R6, R7, R8, R9 = 1K © R10 = 820 © R11 = 1M © R12 = 100 © trimmer R13, R14, R15 = 47 © R14 = 10K © C1 = 10uF....
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The multimeter should be set to the lowest dc volts range for maximum sensitivity. This is normally 200mV DC for most meters. The circuit works well at VHF (around 100MHz) and was quite pleased with the results. L1 was 7 turns on a quarter inch former with....
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This circuit shows a solid-state fluorescent-lamp starter that uses a SIDAC. In this circuit, the ballast is identical to that used with a conventional glow-tube starter. ..
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A UJT Organ circuit with circuit diagram is explained in detail. A 2N 4891 UJT is used for the working of the circuit....
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Everybody who regularly works with servos will know several instances when such a servo tester will come in handy. The function of a servo tester is to generate a pulsing signal where the width of the positive pulse can be varied between 1 and 2 ms. This....
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Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is fitted, its activity will not....
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The following method allows the timer to be triggered by a normally closed switch. This would be useful in applications such as intrusion alarms where the protection circuit is broken if a window or door is opened Trigger Input Control Of 555 Timers ..
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If you do same after W2 will have maximum voltage the released S1 on W2 shortly after short circuit will create BEMF in W2 which is usualy up 20-30 times higher than voltage before. When you learn this method by doing actual testing the similarities will be....
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This is a simple circuit that can detect sounds by using a common condenser microphone. Sensitivity is variable. The circuit`s output becomes High each time a sound is detected, otherwise it is in low level. You can use it in simple robots for sound....
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A fun package full of potential projects! Development board for 28 pin PIC microcontrollers with power supply circuit, crystal oscillator circuit, RS232 port, ICSP/ICD port, 16x2 alphanumeric Supertwist LCD ....
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Sustainable satellite 802.11b wireless internetwork and how it was achieved...
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RS232 to RS485 Converter Circuit Schematic. RS232 to RS485 converters are mostly used in industrial and commercial environments....
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This is a simple how-to guide on making a cheap remote/wireless ignition for a spud gun or other application. It uses a doorbell circuit to transmit an RF signal to activate a relay that completes a 9V stun gun circuit, turning it on. Can be made for less....
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The I2C PIC Interfacing Tutorial circuit is not terribly difficult however it will take some double checking to make sure you have everything hooked up properly before working the first time. The main devices used in the circuit are the 18F452, 24LC02B and....
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This circuit uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that senses....
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The G‚result of the lcd is not correct the thermometer does not show the room temperature but show the 414 degree then i need to know where is the problem is it in the hex file or in the sensor note (i connect vref+ on5v . and vref- on 0v) thanks for your....
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miRover. This pages details how to use a PIC microcontroller and an H-bridge or a L298 to drive a Bipolar stepper motor..
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After building so many Nixie Tube Clocks from the Internet, I finally decided to design my own. My clock uses IN-12 Nixie Tubes and an 8-core Propeller Microcontroller. The Propeller may a be a bit of overkill for the task, but it`s the microcontroller that....
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This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set to any desired value....
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The input capacitor is for the low frequency cut-off and the standard value for the input capacitors is 0. 1uF ( the cut-off for this value is amount to 16Hz)...
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We have designed a walkie cardiotachometer, it can substitute and carry on the metric classic method with pulse auscultator, etc. , it is very convenient to use. This product mainly includes three parts: Collection, data processing and LED of the signal....
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An electronic musical keyboard as a source of variable-frequency AC voltage signals. You need not purchase an expensive keyboard for this - but one with at least a few dozen "voice" selections (piano, flute, harp, etc. ) would be good. The "mono" plug will....
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This is Fire Alarm using IC TD2002 suite, to identify if there is a fire. This alarm is very important in crowd residential complex, so that we can know earlier. This alarm works if there is a fog that generated by the fire cross the lamp and LDR sensor, so....
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A simple doorbell circuit diagram and schematic designed using UM 66 IC, which is a music sound generator. This is an easy to make electronic doorbell circuit....
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Designing and building an AM Broadcast Sucker-outer. The undesired AM broadcast signal is shunted to ground with a series resonant circuit consisting of L1 and C1, C2, and C3. At the HF frequencies, this series circuit will look like an inductor from Input....
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Schematic Diagramis a layout of symbols and and connection of every electronic components circuit where serve as a guide on how the circuit function or work. Learn how to read it. At first you might think that it is hard to do so, You are not going to be an....
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To obtain an accurate pressure value, we must remove the offset errors. There are? many basic circuit designs that is used to remove the offset errors. This...
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This flashing light circuit uses triacs to generate an intermittent light with patchy frequency. extra components are the D1 diode and semi modifiable potentiometer R2. The trigger capacitor C1 is increased from 0. 1 µF to 220 µF so to the triacs can be real....
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A small bias on the bases of Q1 and Q2 via R1 and R2, assists in "starting" This gives each transistor`s base a small forward bias, so that both transistors tend to conduct when the circuit is first switched on [the base voltage on each transistor is zero....
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This is a circuit where a microphone and preamp circuit (voice circuit) have priority over any other audio signal. You can think of this as a one way intercom, if the main amplifier is used for listening to music, then when the push to talk switch is....
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A circuit to turn on/off a couple of big AC solenoid valves and a couple of 1ph ac motors. my line v is 132VAC and the solenoids measure 1A and the motors measure 13A and 27A once running. does anyone know how to do this with triacs they are much cheaper....
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This Voltmeter Ammeter was designed to measure output voltage of 0-70V / 0-500V with 100mV resolution and 0-10A or more current with 10mA resolution. It is a perfect addition to any DIY laboratory power supply, battery chargers and other electronic projects....
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This circuit allows you to equlize the audio signals in 10 band. It uses low amount op-amps (TL074 - JFET op-amp) to anatomy a able blaster circuit. The affection of the architecture is a classical band-pass alive filter. The VCC is in ambit of 12 ~ 15 VDC....
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The Interfacing Bluetooth module with LPC2148 program is very simple and straight forward, which send a message to mobiles from LPC2148 Primer Board through Bluetooth module by using UART0. Some delay is occurring when a single data is sent to mobile through....
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motor control, energy efficiency of inverter (AC drive) selection and parameters setting guidance in mine industry: vector control, open loop or closed loop control, with energy braking unit or energy feedback unit....
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This circuit is used to connect the camera with very log wire. This is actually a video amplifiers. This circuit consist of two part, they are sender part and....
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This low-power 25 watt power inverter circuit which makes use of only 9 electronic parts. The inverter turns 10V to 16V DC input into 60Hz, 115V square-wave power output to operate AC electronic devices approximately 25W. The very first section of the 556....
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From what I understand, an SCR is like a diode that can either be turned on to act like an everyday diode, and it will only turn back off when the power is cut. With this understanding, will this circuit work if not, can you explain even if itdoesn`twork as....
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Water tank overflow liquid level sensor alarm circuit is a simple electronics project for school students. In the previous articles we had discussed about numeric water level indicator and water level controller circuit, but those circuits are much complex....
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The motors will be driven from the full source voltage, so make sure this isn`t going to make your robot too fast! Firebot has GM3 motors driven with a 9V battery, however the circuit differed and the motors were only driven by 5V from the voltage regulator.....
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This 2 Watt FM transmitter will provide 10km range in good weather conditions. Use dipole antenna for maximum range. Transmitter can be tuned between 88-108 MHz with c5. BB204 could be replaced with conventional led (big) with reverse bias (no light given in....
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Function: To prevent equipment damage from pressure., and for delay other appliances connected to the output of the relay. 4011 IC, Diode, Relay, ....
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Inverting amplifier is one of the most popular Operational Amplifier circuits. The output changes in such a way that tries to avoid saturation and counteract the change caused by the input. This makes the amplifier stable. The amplifier tries to resist....
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the diagram is a modify square wave inverter circuit diagram, and if you adjust the frequency by adjusting or turning the frequency resistor (VR 47Ok) the inverter output frequency can be strong enough to power a freezer compressor and some other electronics....
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I want to make an FM jammer so I can play whatever music I want through my school bus radio. (It`s legal where I live :3) Can someone help me with....
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An oscillator can be built using LC (inductor-capacitor) tank circuit. When we vary the capacity of the capacitor in LC tank circuit then the frequency of the....
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This circuit might also be of interest to people making pre-amps for electret and externally polarized condenser microphones which have no internal FET. (If a single FET`s noise is the limiting factor, perhaps two or four could be run in parallel. ) Some....
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Using LM231/331 chip, we can build a low-cost voltage-to-frequency converter, ideal for analog-to-digital conversion, frequency-to-voltage conversion, long-term...
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IC bus line explains conduct and transmits the bus line as one kind, it uses and is wired little, simple in construction, it is the extensive high-performance bus line way of a application. The operating system that and Linux cuts out publicly and easily as....
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The PR4403 is an enhanced cousin of the PR4402 40mA LED driver. It has an extra input called LS which can be taken low to turn the LED on. This makes it v....
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Studying current measurement is a prerequisite for many of the measuring techniques. The current parameter mainly specifies the power consumption in a circuit, given the value of resistance. It is found convenient to measure current rather than voltage for....
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I am pulling my hair out since I keep destroying the Murata NMC1215SC DC/DC converters in my CPU controlled H-Bridge design. There is no obvious signs ....
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The video transmissions from this unit can be received on a small Portable/Tunable and battery operated TV set such as the ones you find in flea markets, etc...
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This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3 battery. Zener diode ZD1 is applied to convert 9V into 5V DC to drive the gas sensor module. The SEN-1327 gas sensor module from RhydoLABZ is applied in this....
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Here we make use of DTMF (dual-tone multi frequency) signals (used in telephones to dial the digits) as the control codes. The DTMF tones are used for frequency modulation of the carrier. At the receiver unit, these frequency modulated signals are....
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This circuit shows about Go-No/Go Tester Circuit With 555 Timer IC. Features: more advanced unit with a precise timed testing procedure. ....
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Combination of IF amplifier, audio compressor, tunable audio filter, and audio output system operates from single supply. Compressor and filter each use N5558V dual opamps or equivalent units. Tuning range of filter is about 500 to 2000 Hz. IF input goes....
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Overcome a major drawback of the SPI bus. But to explain this, allow me to go on a little detour first. The I2C bus is an extremely convenient design, because it only needs 4 wires to connect several chips together: Each chip sees the same information, but....
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When spun rapidly between the fingers, a bipolar stepper motor will generate around 10VAC. If this is stepped up with a small 240V to 6-0-6V transformer in reverse (with series connected secondaries), a small bipolar stepper motor is capable of powering a....
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Here is an ultra sensitive earthquake detector circuit that can sense seismic vibrations. It can be used to detect vibrations in the Earth. So it is an ide....
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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In the circuit, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-)....
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Most homes today have at least a few infrared remote controls, whether they be for the television, the video recorder, the stereo, etc. Despite that fact,....
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AVR Microcontroller And Best-in-class 2. 4GHz RF transceiver ATMEGA128RFA1 is an IEEE 802. 15. 4 compliant single-chip, combining the industry- leading AVR Microcontroller and best-in-class 2. 4GHz RF transceiver providing industry`s highest RF performance....
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Many households are still graced by tube-type television sets. If you want to connect one of these large tellies to your stereo system to improve the sound quality, this is usually not a problem because there are plenty of SCART to Cinch adapters available....
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2004 chev impala - unable to find the fuse for the rear defogger. I find the relay but both manual and actaul car diagram and passenger side fuse block show 30amp fuse - but nothing is there. Thanks, I check that fuse and it is OK. I see there is a circuit....
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This is the circuit diagram of laser communication system that transmit the sound or music signals by way of a laser beam. The intensity of the laser beam varies together with the amplitude of the sound signal. The variation within the intensity of the laser....
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Synchronous clock signal is input to a cascade of timer circuit composed of two LM122H, then the synchronization clock is converted to the desired width of the pulse (Fig. 10?s) which will be add to LF198 LOGIC end (8 feet) as the sampling and holding....
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This is a driver circuit for nixie tube. This circuit uses 2N3684 as nixie tube drivers because its Vp is 2-5 volts which is ideally matches TTL-DTL logic....
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The remote control transmitter is composed of the DTMF generator and the FM transmitter circuit. Here we use one piece of UM91214B phone specific IC to produce the DTMF signal, the 3V power supply voltage is supplied by the 3V zener tube D1.The transmitter....
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The Ping is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor (from 2 cm up to 3m). It works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object. The....
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If you`ve ever tried dimming a LED with a simple potentiometer, you know that the approach does not work very well. Just as with ordinary diodes, the voltage-current characteristic of LEDs is far from linear. The result depending on the potentiometer setting....
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The main characteristic of the transceiver presented below is the simplicity, but in the same time giving good performance, with a minimum investment. The radio is based on MC3362 ( buy ). This integrated circuit its an FM receiver, double conversion, which....
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This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom are stricter than in most other countries and a dynamo is, therefore, a rarity in the UK. For safety`s sake, it is....
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The circuit above is the canonical AC coupled common emitter amplifier which is typically used as a linear amplifier, not a switch that "turns on" when the input is above some level. Alfred Centauri Apr 9 `13 at 19:26 Edit you question to reflect what you`re....
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EIA/TIA-422 defines a Balanced (differential) interface; specifying a single, unidirectional driver with multiple receivers (up to 32). RS-422 will support Point-to-Point, and Multi-Drop circuits, but not Multi-Point [ EIA485 ]. EIA-485 devices may be used....
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The HT70XX series is a set of three-terminal low power Voltage Detectors implemented in CMOS technology. Each Voltage Detector in the series detects a particular fixed voltage ranging from 2. 2V to 7V. The Voltage Detectors consist of a high-precision and....
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Its a simple circuit of 12V DC to 120V DC converter. The circuit consists of two phases first phase of the investor base and then a rectifier and filter stage. IC1 NE555 is wired as an astable multivibrator operating at a frequency of 100 Hz and can be....
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This page identifies all the hardware modifications necessary to adapt a Kenwood TK-931 transceiver for 902 MHz repeater receive operation. Not shown here is the effort required to program the radio for the desired operating frequency. This is accomplished....
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We can use NE556 timer IC to make indication of static of terminal in digital logic audible.? Audible logic probe can be very useful when we have to visually...
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Unlike many units, this battery charger continuously charges at maximum current, tapering off only near full battery voltage. In this unit, the full load....
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The digital circuit additional a circuits taht is very useful is On-Shots circuit or Also known as Mono-stable multivibrator circuit. This behavior is the....
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The QCard Controller Single Board Computer ( SBC ) contains the Freescale 68HC11 microcontroller, RAM and Flash memory, digital input-output ( I/O ), and A/D. For more complete information about the QCard headers listed on this page, please see Getting to....