New Circuits Page 77
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This simple but effective circuit can be used to control water level in a container. The prototype is used to pump water out of a bucket that collects condensation from a home air-conditioning system. The design is based around a 555 timer (IC1). Although....
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In the example above a low voltage (12Vdc) is used to turn on a relay to switch on a 240V ac main circuit. Please note that there is no electrical connection inside the relay between the two circuits, the link is only magnetic and mechanical. If there is....
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Here, S1 and S2 are normally open, push to close, press button switches. The diodes can be red or green and are there only to indicate direction. You may need to alter the TIP31 transistors depending on the motor being used. Remember, running under load....
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The classic Rangemaster is thought to have been the source of some of the best tones in rock guitar, from Clapton`s Beano sound to some of Brian May`s singing sustain tones. While the effect is a simple one-transistor booster, locating a good quality....
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The three circuits were based on the vacuum tube ECC83 designed to produce phono preamplifiers in compliance with the RIAA standards. Recording Industry A....
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Hey, Just wondering how to choose my L,C,R variables to achieve a desired frequency. Do I just choose any combination that yields X Mhz = 1 / ( 2pi *....
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This circuit permits direct connection of composite video signals from video games and microcomputers to the antenna terminals of TV sets. The output signal level is controlled by the modulation input. ..
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SCR TESTER CIRCUIT The Device under test cathode, anode and gate are connected to the unit`s CATHODE, ANODE and GATE terminals,....
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This the circuit AC dimmer low voltage For lamp 6V. While this friends may don`t see the advantage of this circuit. But I thinks first step advantage be something get learn the work of Triac. And have tall safety, because of use AC Low Voltage. Which the....
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Lots of consumer electronic equipment like TV sets, VCRs, CD and DVD players employs infrared remote control. In some cases, it is desirable to extend the....
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The MC34164 VS used in the Chloroplast SE is different in one respect from the 1381 VS (used in the VTSE and 1381 SEs) in that the MC34164 has an "open drain" output which requires a pull up resistor to the positive supply for the output to go positive. The....
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This is a switching circuit that provide latching mechanism to make a set of radio buttons using push buttons. This circuit consist of interlocking circuit....
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Detects the amount of salt contained in liquid foods, Three-level LED indicator This circuit was designed to detect the approximate percentage of salt con....
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The modifications involve direct access to the stepper motor controls of your mount. Any "mis-control" or "mis-command" / "invalid parameter" or "garbage" data sent to the mount could accidentally activate the stepper motors and allow it to rotate "freely"....
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With the phasing out of game, serial and parallel ports from modern computers and the ever increasing popularity of USB, it makes sense that hobbyists start getting to grips working with USB. Unfortunately, USB is not a simple protocol and can be daunting to....
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Everything is working with simple passive mosfet drive. But if we increase switching frequency or place powerful mosfet (or even several mosfets) There is no load in gate circuit, but there is gate capacitance. And if we need fast switching we must charge....
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With this circuit, the LED blinks every half second. How long the blink time is, can be adjusted by adjusting the value of capacitor C1. Up to 18 additional LEDs can be attached to this circuit (36 LEDs total)...
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Geralds 1958 Cadillac Eldorado Seville, 1967 Cadillac Deville,1967 Eldorado and 1971 Lincoln Continental Mark III - everything you always wanted to know about these cars ..
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This electronic project stereo amp is based on the STK415-090-E class H audio power amplifier hybrid IC that features a built-in power supply switching circuit. This STK415-090-E class H audio power amplifier provides high efficiency audio power....
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Have a proper look at the Kapanadze video in the transparent box and see that the vertical coil has copper tape windings on it resulting a capacitor that captures the environment particles with the help of the high voltage. I have done some experiments with....
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My product requires a voltage-controlled, current-limited power supply and for a number of years I have used various switcher chips with an op-amp to feed back a current sense voltage to the feedback pin. For the last couple of years I have been using an....
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Finally mark the entire scale with the usual metronome steps as following: 40 - 42 - 44 - 46 - 48 - 50 - 52 - 54 - 58 - 60 - 63 - 66 - 69 - 72 - 76 - 80 - 84 - 88 - 92 - 96 - 100 - 104 - 108 - 112 - 116 - 120 - 126 - 132 - 138 - 144 - 152 - 160 - 168 - 176 -....
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This circuit generates high voltage pulses from 230vac line voltage. The drive end`s swing comparator circuit is invented by the creator of this page. The work end is derived from stroboscope trig supply circuit. All line voltage using circuits are....
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Cell phone jammer is an electronic device that blocks the transmission of signals between the cell phone and its nearby base station. By using the same frequency as the cell phones, the cell phone jammer creates strong interference to the communication....
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This circuit is very simple less than 12 component, to build DC to AC converter. The principle of this circuit is generating 50/60Hz frequency by IC CD4047 and the output complement pin 10 and 11 of IC CD4047 to drive MOSFET IRFZ 44 so induction primary....
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It can detect what`s being typed on it. It can be used to send text to and/or receive text from a computer via USB. It was designed as a platform for playing interactive fiction games, in particular to play custom software being developed for it by Jim....
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Can anybody tell me if the output of a monostable 555 timer circuit can be used to trigger another similar timer circuit. I have shown my idea with a....
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A flashing LED signals the necessity to water a plant, 3V powered circuit This circuit is intended to signal when a plant needs water. A LED flashes at a....
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The circuit tests a flyback transformer of the televisions that the result is a simple, easy and cheap to build. One of my friends is TV repairman colors -....
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I want to power a condenser MIC ( Electret 2 terminals ). I connected a resistance of 1k and capacitance of 10uf to its positive terminal and grounded other te....
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The circuit described here is of an economical smooth variable power supply which offers 0V to 24V. It provides all controls and short circuit protection with acceptable regulation and a ripple free supply and yet uses very few components. The circuit....
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LME49810 Audio Amplifier Schematic is shown in the following circuit diagram. According to the LME49810 datasheet, this is a high fidelity audio power amplifier driver designed for applications such as Audio video receivers, Guitar amplifiers, Powered studio....
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This post is based on the work made previously by tomek in wiring LCD displays using 4 bits. The basic idea is to group the 7 pins that are needed to drive the LCD in only 3 using a shift register. This is a cheap alternative to serial LCDs. The schematic....
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This circuit will provide electric power from a backup battery when AC power is cut, always providing a clean 5V power supply for sensitive equipment like microcontrollers and logic circuits. The value of C1 is to be higher than 220 µF. The bigger the....
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The circuit was designed for the purpose of increasing an input signal of 4 Watts to 6 Watts operating on the VHF radio frequency band specifically the FM....
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Single-chip digital voltmeter. This 4 1/2-digit DVM circuit is built around a Maxim ICL7129ACPL A/D converter and LCD driver. An ICL8069 CCZR 1.2-V band-gap reference diode is used for a...
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The EtherSmart Wildcard is based on the Lantronix Xport Ethernet device server which is built into an RJ-45 connector housing. The XPort exchanges data via a serial UART -USART interface, while the Wildcard bus is a parallel interface. A UART (Universal....
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The schematic diagram below shows a very simple sample-and-hold circuit using the CA3140 as the readout amplifier for the memory capacitor. The CA3080A is used...
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The 220-240V AC mains source is stepped down to 9V AC by transformer X1. The transformer output is rectified by diodes D1 through D4 connected in bridge configuration and the positive DC source is straightly wired to the charger`s output contact, while the....
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Here`s a design circuit for temporary lamp circuit is very helpful in emergency situation or in any application where we don`t have much time to turn off the lamp. Just press the push button, do a little fast task, and then leave it. This circuit hold the....
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a simple electronic combination lock using IC LS 7220. This circuit uses a relay for controlling any type of device when the combinations of four digits are pressed. Keypads are used as input here to enter the digits and the correct combination will activate....
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The graphic equalizer shown here is based on the IC LA3600 from Sanyo Semiconductors. LA 3600 is a single integrated single Op-amp, 5 band graphic equalizer IC which is very suitable for applications like portable stereo, radio sets, home theater systems,....
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This is the another UHF-TV pre-amplifier circuit diagram which simpler than the previous UHF TV preamplifier. This circuit is based MPSH10. Alternatives that could be put to use to replace MPSH10 are BF180 and BCY90. The tuned circuit comprising the 15nH....
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The point being if it connects it`s good if it don`t it don`t, there`s no inbetween. If you got a solder joint it`s going to connect or it`s not going to connect, that`s it. 0. 25 to 4ohms come on really. Do they even make resistors that small to set it with....
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LS-2 remote control switch infrared sensor module is basically the same with the LS-18, in addition, it isused as a reflector. LS-2 Pin diagram form LS-2 internal block diagram Electrical parameters LS-2 remote control switch module operating voltage is 4 ~....
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Game-scoring display screen circuit diagram is shown as in the above picture. The circuit is composed of add/subtract scoring input circuit, add/subtract scoring circuit, counting - decoding display circuit and reset circuit....
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The all-transistor T3SE works much like a conventional SE: like the Tritium, it fires when the charging current drops below the minimum and after the circuit triggers, positive feedback is used to latch the circuit, resetting at a fixed voltage on the main....
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This is an UHF bandage TV antenna preamplifier circuit With 15dB accretion to body easily. It is formed based on BF180 UHF Transistor. The aboriginal date is an bandage canyon clarify complete by the C1, CV1, L1, L4, C7 and C3, the additional date is a....
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Protect your Locker or Briefcase from theft using this pocket sized gadget. It gives a loud police siren to catch attention. The circuit uses a single IC a....
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As demand for VRM output current being bigger and bigger, the components and parts of SR-Buck converter can not already meet the demand for the microprocessor 100 A of new generation; In addition, the filtering inductance of making the heavy current is very....
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Hey guys, apologies in advance for the wall of text, but this is a diagnostic problem and I felt I should include as much info as possible for those....
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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)..
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Not thrilled with how a computer soundcard drove my 32ohm headphones so I decided to build myself class-A mosfet headphone amplifier. As with most of my projects, the goal was to keep it simple, keep cost down and try use some salvaged parts. This is a....
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A 2000 GMC Yukon Denali that is intermittently losing power to the radio, power windows and wipers. I know these are all fed from the RAP relay but I find it hard to believe the relay could be failing at such random intervals with no apparent pattern. Could....
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This current-limiting circuit, shown in this example as part of a small bench power supply, could in principle be used in conjunction with any dual-rail current source. The part of the circuit to the left of the diagram limits the current at the input to the....
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The 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 the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and....
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Yes, both of those transistor types will be suitable. Is the ""sn9304"" a 2N3904? That`s a common type. You`re going to have four LEDs on at a ....
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The common wiring method had one side of the line cord going to a pin on the rectifier tube and the other side going to one terminal of the on/off switch. The other terminal of the on/off switch went to chassis. Suppose you plugged it in so the chassis was....
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Having your Arduino control higher-power devices like lights, motors, pumps, doors, and many more is one of the most interesting and useful applications you may get involved with. But it can be a little difficult and possibly dangerous when power line....
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This voltage-booster circuit for driving one or more white LEDs uses a 555 timer as its main element ( see the figure ). The timer, IC1, functions as a resettable astable multivibrator where R1, R2, and C2 are the timing components. When the supply voltage,....
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This PCB was inspired by Colin Fraser, who found some very useful extensions to the bass drum circuit of the Roland TR909. Trevor page`s 9090 - project was of course also very helpful for me ! As an addition to these modifications, I added a "compression"....
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48 V ‘phantom powering has become the standard for professional condenser microphones. The supply (or rather bias) voltage is applied over both wires of....
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In order to switch some floodlights by my Arduino, the small switch circuits I built around a 39mf22 were just not man enough to handle the current ne....
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A data logger is a device that records measurements over time. The measurements could be any physical variable like temperature, pressure, voltage, humidity, etc. This project describes how to build a mini logger that records surrounding tem....
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Install the PIR module hanging from a 3 metre high mast (to cover 10 metre radius area) and connect its supply and relay terminals to our finished and enclosed circuit, observing right polarity. A 4-core screened cable can be used for this interconnection.....
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Function: useful to the subwoofer in phase with the speaker of the existing car radio.Component: dual-linear motion potentiometers, capacitors, electrolytic ....
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The ectronic fishing shrimp machine circuit is composed of the astable oscillator, inverter circuit, high voltage output circuit, and the circuit is shown as the figure 20. Astable oscillator circuit is composed of the time-base integrated circuit IC,....
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This is a design circuit for sine wave oscillators that will provide both a sine and square wave output for frequencies from below 20 Hz to above 20 KHz. The frequency of oscillation is easily tuned by varying a single resistor. This circuit is controlled by....
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The Measured Value and The Setpoint are two inputs to a Control System. The Measured Value is the Amplified input of a Transducer or Sensor for some Parameter that needs to be controlled. It could be Pressure or Temperature. etc. The Setpoint is the User....
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Mark Harrington 3 in 1 Door Bell. The circuit comprises the power supply which is formed by TR1, Q3 , D13 , Q1 , D9....
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This is Circuit Diagram 0.1 Alpha Software, all free to download and also available open source....
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Transistor amplifier circuits which are very simple and easy to construct. Includes head phone amplifier, 4 transistor amplifier and a low power amplifier....
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This data sheet describes the evaluation board for the AD9834 direct digital synthesizer (DDS). The AD9834 is a numerically controlled Oscillator using a phase accumulator, a sine look-up table, and a 10-bit DAC The AD9834 CAN be operated with Clock....
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This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This mic preamp can take both....
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Learn to use the LCD display on your pic 18 explorer board with the spi library. The spi library will be used to easily display characters on the LCD. You will also learn how io expanders work...
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This radio modem is popular for amateur radio packet application. This radio modem is powered by the data and control lines, so it need no additional power...
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When the input signal is logic 1, the display shows `H` and the loudspeaker emits a note which is an octave higher than the `low` tone. Operation of the circuit can be seen from the circuit diagram in figure 1 and the truth table in figure 2. When the input....
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The following circuit shows about Schematic Diagram Of LED Sequencer. This circuit based on the 555Timer IC. Features: 555 timer circuit to debounce a mechanical switch, 555 timer circuit to produce clock pulses, pulldown resistor, 4017 decade....
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I have a small solar panel for maintaining my 12V car battery. (Circuit below.) The panel supplies about 75mA to the battery in full sunlight. I want to avoid wastin....