Popular Circuits Page 195
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This is a simple circuit of low power regulator reference. This circuit can produces stable voltage reference. The voltage reference that is produced by this....
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AUDIO AMP + 3KHz FILTER. This circuit is the audio amp section for a complete optical transmitter. The increased circuit and filters the voice audio signals from an electret microphone..
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It is located in the LHC underground installation, close to the loads to limit cable losses in the underground installation. A high current switch mode power converter, designed for powering of superconducting loads requiring only positive current and....
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Circuit Filters with high orders are designed usually with 2 or more cascaded sections. This order 4 filter need only one OA IC, so we can achieve lower distorsions, lower intermodulation Resistors values represent the load on the OA output, the maximum....
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This circuit will be of interest to the radio amateur and anyone posessing two radios, (one of which must be able to transmit i.e. a transceiver). It is a self powered (audio derived) repeater circuit for receiving a signal and re-transmitting it via the....
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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....
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300W Subwoofer Power Amplifier. High power amps are not too common as projects, since they are by their nature normally difficult to build, and are expensive. A small error during assembly...
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This circuit is a motion detection sensor, this circuit uses a light source and detector as a sensor infrared motion detector. Motion sensor using infrared LED and phototransistor. Because it uses light to the sensor sensitivity can be affected by....
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A simple thermometer built with operational amplifiers and a normal or protective diode such as 1N4148, instead of the temperature sensor can be made using electronic diagram below. A constant reference voltage is applied to the noninverting input of....
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Many security-alarm systems require the use of a random number. A computer program uses this random number to create a sequence of random numbers to prevent unwanted visitors from gaining entry into a protected facility. You can use a "rolling-code....
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This wave shaper needs an input saw that goes from Vss to (ideally) Vdd. It works well with the 4069 VCO designed by Ren? Schmitz. Any saw will work as long as the wave is centered halfway between the rails. It works as follows: The upper set of 2 linear....
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When I first built the Heart rate measurement through fingertip project, the infrared LED and photodiode used for finger photoplethysmography were actually from salvaged parts, and therefore, I could not provide specifications for them in the article. As a....
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The continuity tester can distinguish between high-, medium-, and low-resistance connections. When there is a conductance between the inputs, which are linked to small probes, a current flows from the +9 V line to earth via R1 and R2. The consequent....
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The circuit in Figure 1 uses IC1, the integrated offline Viper22A switching regulator in a constant-current configuration to drive two to eight 1W LEDs. The circuit operates by monitoring the voltage drop across the sense resistor, R6, and uses this voltage....
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The circuit diagram of TV antenna The diagram is from the tech information of chinaicmart. IF for more detailed infomation or more circuit ....
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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....
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This simple LED driver circuit allows us to drive up to seven LEDs by using a single NiMH (Nickel Metal Hydride) AA cell. The circuit produces voltage puls....
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The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. As the probes get wet, a small current flows between base and....
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This transmitter was designed from the ground up to provide very high sound quality, coupled with excellent frequency stability, reliability, etc. It can be used as a standalone transmitter to serve a medium-sized town, or as an exciter to drive a....
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This circuit uses a Hall-effect sensor, consisting of an IC that resides in a small gap in a flux-collector torrid, to measure de current in the range of 0 to 40 A. You wrap the current-carrying wire through the toroid; the Hall voltage VH is then linearly....
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This broadband AM receiver enables you to monitor` the shortwave radio band. The circuit has been deliberately designed to have low selectivity and is most sensitive in the range from 6 to 20 MHz. This frequency range contains most of the shortwave broadcast....
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Every cheap energy-saving lamp has a self-resonant voltage inverter inside. They are designed for low-power operation up to a few watts. Why don`t scale up the whole thing and replace the resonance circuit for generating the needed lamp voltage with the....
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This circuit is basically a 8W inverter circuit. The circuit continues to be intended to drive an 8W fluorescent lamp from a 12V power supply, utilizing an cheap inverter primarily based on a ZTX652 transistor. The inverter will operate from supplies in the....
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A powerful buzzer in the room, combined with a pushbutton at the bottom of the stairs or in the kitchen, could be very handy in such situations. The heart of this circuit is formed by IC1, a TDA2030. This IC has built-in thermal protection, so it`s not....
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The system consists of a CD player, amplifier, speakers, power supply, headphones. Mitsumi CD machine designed for the United States and 97 years in mainland China launched a 4-speed CD-ROM, and to speed up the panel out of box keys,..
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This VHF VCO circuit is suitable for 30 to 200 MHz. Q1 can be replaced by a 2N3563 for operation above 100 MHz..
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A simple voltage-to-current converter is shown in the figure. The current out is 0t or Vjn/R. For negative currents, a pnp can be used and, for better accuracy, a Darlington pah-can be substituted for the transistor. With careful design, this circuit can be....
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Half of a Motorola MG14538B dual, precision, retriggerable mono stable multivibrator is used to form an extended on-time timer circuit. That type of circuit can be used as a switch debouncer. Such circuits are often used in digital circuitry, where each and....
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There are a few situations when a power failure is particularly difficult to handle. Some of these circumstances occur in the bathroom. This little circuit will pay for itself many times over the first time it is used, especially if you are in the shower.....
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One LED monitors three levels: 50, 70 & 85 dB
Useful to detect too noisy environments. This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85....
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(1) with the direct promotion of complementary high-power tube STK3048 STK 3048 the use of high voltage, wide dynamic, accurate differential input pair tube, with a common emitter terminal and the output terminals are collector constant current source..
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In the miniature high-voltage dc generator, the input to the circuit, taken from a 12-Vdc power supply, is magnified to provide a 10,000-Vdc output causing a pulsating signal, of opposite polarity, to be induced in Tl`s secondary winding. The pulsating dc....
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Microchip has announced the availability of new PIC16F1512 and PIC16F151213 XLP microcontrollers. These new XLP (EXtreme Low Power) microcontrollers feature....
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The CF8223A is a FSK (Frequency shift keying) decoder and DTMF (Dual Tone multi-frequency) receiver IC. It is fabricated using a CMOS process and features a power-down function for low power dissipation opera- tion. The FSK decoder and DTMF receiver have the....
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circuit Infrared Intruder Alarm This the circuit warns the trespasser infrared system or Infrared Intruder Alarm circuit that interesting. By when there is a...
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BFO is a simple device which helps us to listen SSB and CW transmissions. Reception of SSB and CW signals requires a product detector or BFO (Beat Frequency Oscillator) to reinsert the missing carrier. This circuit is very simple since it requires no turned....
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This is the circuit diagram of audio/video modulator. The circuit will convert an audio and video signal into a UHF TV signal. It`s desired to connect a video signal originating from a camera or other video source to a normal TV set. The audio and video....
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This LM3886 amp electronic circuit project is capable of delivering 68W of continuous average power into a 4ohms load and 38W into 8ohms with 0. 1% THD+N from 20Hz 20kHz. The performance of the LM3886 amp, utilizing its Self Peak InstantaneousTemperature (....
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A low-noise LT1115 (Linear Technology, Inc.) op amp is coupled to a class-A buffer amplifier to produce a variable g..
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The Jammer is a very small circuit and can fit inside a small plastic box with 9V battery inside. It can be very illegal if you attach an external antenna so don't. adjust frequency by turning trimmer. It is intended only as a practical joke device. The....
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This Outdoor LED Solar Garden Lights project is a hobby circuit of an automatic garden light using a LDR and 6V/5W solar panel. During day time, the internal rechargeable 6 Volt SLA battery receives charging current from the connected solar panel through....
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All about the famous Corsair and Commando Transmitters designed by Dave Martin of WNKR. This blog will show you how to make each of the transmitters and show you examples that other people have made for them selves. The circuit below is basically the first 2....
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A number of people have been unable to find the transformer needed for the Black Light project, so I looked around to see if I could find a fluorescent lamp driver that does not require any special components. I finally found one in Electronics Now. Here it....
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As shown in FIG To eliminate hum instrument amplifier circuit. FIG amplifier stage A1, A2 selected integrated operational amplifier INA101, followed by level A3 selection INA10..
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As shown in FIG inverted to adopt IC1MAX868 and CMPSH-3S consisting of four times the pressure of DC/DC converter power supply. IC1MAX868 which is a type inverting charge pump ..
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Invert a signal to drive fets with hard/fast rise and fall times. I was told in another thread to use an inverter (NOT chip). This makes perfect sense to me since logic chips are always hard ON or OFF by design. But I`ve never worked with logic chips before.....
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This liquid detector circuit diagram is designed using common electronic components. The liquid detector may operate an active buzzer, to make a sound when is reached a certain level of water. Because water sensor and control circuit for buzzer are located....
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The applet shows a simulation of Chua's circuit, plotting the voltage measured across C1 against the voltage measured across C2. This corresponds to the display on an X-Y oscilloscope with probes connected across these capacitors. The initial values of the....
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While I`m getting ready to rip open some 10+ broken DVD-RW drives coming to me from an eBay seller, I though it would be great to have a testbed for the bipolar stepper motors I will harvest from those. I have a bunch of ULN2803AG Eight Darlington Transistor....
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Breadboard and test the DIY IR jammer last weekend but it`s taken me this long to carve out a minute to post the results. The schematic is correct and only took a few minutes to re-create on the plugboard. For power I used a small bench supply set to 6 volts....
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This 0- to 12-Vdc variable power supply uses an IC voltage regulator and a heavy-duty transformer to provide a reliable dc power supply. Looking at the schematic shown, you can sec that transformer Tl has a 120-V primary and a 28-V secondary. Filtered dc is....
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When trying to move things with microcontrollers, there are basically three kinds of motors that are most useful: DC motors, servomotors, and stepper motors. Most all motors work on the electrical principle of induction. When you put electric current through....
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Tom Au-Yeung and Wilson Tang, Maxim Integrated Products EDN You can make a wireless temps system with two ICs You can use a local temperature sensor and an ASK (amplitude-shift-keying) transmitter/receiver pair to design a simple wireless....
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The handheld mini light beam receiver. On the left is a small solar cell, you can make out the various components on the circuit board through the transparent lid of the box. On the right, top and bottom, are the headphone and crystal earpiece sockets while....
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Using high voltage transistors can be designed a DC power supply that can provide a supply voltage between 10 and 300 volts which can be adjusted with the potentiometer P1. Transformers typically used in such sources have several windings of high voltage and....
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The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the bug with a 9Volt Battery, or you can plug a power supply....
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Make the following connections: GND (pin 8) to ground, Vcc (pin 16) to 5V OE (pin 13) to ground MR (pin 10) to 5V This set up makes all of the output pins active and addressable all the time. The one flaw of this set up is that you end up with the lights....
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In the project LED Touch Sensing by Jeff Han, I saw a magic happen on a LED matrix. That LED matrix not only lighted but also sensed the touch of fingers. At first, I thought there should be some secret behind and the LED matrix he used must be a special....
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FETs can be found in the power section, LCD inverter, UPS, Amplifier, Monitor B+ and S-correction circuit, ATX power supplies and etc. When this component fails, one has to use a meter to test it to check if it is good, shorted, openor leaky. The meters can....
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The 0. 5" force sensitive resistor (FSR) is a quick way to measure pressure, and is very easy to setup. The FSR varies its resistance depending on how much pressure is applied to the sensing area. The greater the force, the lower the resistance. When....
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From 230 V AC a DC supply of + 5 V is obtained. The power supply is given to the other blocks. The pulse generator at a particular frequency generates the clock pulses. The clock pulses are counted by a counter and gives output after every 10 pulses. The....
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This page is a revised version of the original submission of an article entitled "Better Bachmann Sound For Under A Buck" published in the Feb. 1998 issue of Garden Railways Magazine. Editorial changes and additional artwork that might have been added by....
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The thought of going to 24 GHz was far from my mind back in the summer of 2002. We had just come back from the Central States VHF convention in Madison Wisconsin where I had done a bit of chatting about it, but nothing serious. With Jenna just being born, I....
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I bought a solar powered garden light. The solar panel charges the batteries and when it gets dark the lights (3x LEDs) turn on until it either gets lights again or the batteries run out. First, the batteries. The control box houses the batteries, which are....
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A classic amateur radio transmitter topology, the oscillator-amplifier (sometimes called master oscillator, power amplifier, or MOPA), used one tube for frequency control and another for RF power amplification, and in quartz-crystal-controlled form commonly....
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Circuit schematic shown in Figure 1-29. The aircraft from the 1/26N2 as voltage amplification by the power amplifier as 6P1, rated power up to 1. 5W. Filament DC powered to eli..
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In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit....
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No description available...
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This is a simple light running circuit by music This circuit is not difficult, is MONO, with a few accessories. Can be connected to the output of a CD or...
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A preamplifier circuit suitable for high impedance type electric guitar pickups is given here. The circuit is based on a uA 741 op-amp (IC1). The IC1 is wired as a non-inverting amplifier. The POT R1 can be used as a volume controller. The POT R6 can be used....
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The transducer circuit can be operated as either a tone encoder or decoder by changing the position of Sl. The operating frequency of that dual-purpose circuit is determined by C3 and R2. Capacitors Cl and C2 are not critical and can be of almost any....
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The switching power supply provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit. With reference to the schematic, the front panel power-on light is not shown. There....
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A schematic arrangement for a two quadrant controller is shown on figure below. This figure show us the outer speed control loop and the inner current control loop. The tachogenerator derive the speed feedback signal, although alternatively an approximation....
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The original power supply AC-3400 with charger function. Except for the button and the indicator of inclusion, on the forward panel there is an indicator of a level of a charge of the accumulator, a start button, and a socket for connection of the....
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In this electronic roulette wheel (see Fig. 1. ) the timer 555 works as a generator of pulses with fading frequency. The counter 4017 switches LED`s one by one in the selected string, and the divider by two based on D-type flip flop (4013 IC) selects the....
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Automated instrumentation wiring using interference filters for the inverter is not as harmonic processing and the like, when the work will be radiated field strength of strong..
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FIG. 283 is a blackout emergency lighting controller, it is only the external side in the two lead s, can directly replace P Chan Tong Ge opening, when there is electricity, it..
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To set the above amplifier up, set R1 to max and R12 to 0. After doing this successfully, power on the amplifier. Set R1 so that the measured output offset is between 30 and 100mV. Once set, adjust R12 slowly to achieve a quiescent current of around 120mA.....
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Using the LM3404 are monolithic switching regulator can be designed a very simple constant current driver for high power LEDs. This LED driver electronic project is ideal for automotive, industrial, and general lighting applications. Hysteretic controlled....
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A single op amp, one fourth of an LM324 quad op amp, is configured as a standard inverting amplifier. At power up, a positive voltage is applied to the noninverting input of Ul, via R3, forcing its output high. That high output travels along three....
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The three circuits above provide a constant current through the LED (or LEDs) when the supply rises to 15v and higher. The second and third circuits can be turned on and off via the input line. This is done by turning on the top transistor via the....
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This circuit is simple. The first 555 timer prevents the second timer from being triggered while the first is running...
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Teledyne Semiconductor"s Type TSC9402 IC is eminently suitable as an inexpensive current-to-frequency conver..
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This counter uses a four-digit display, but with a flip of the range switch, it can display frequencies from 1 to 40 MHz, with a resolution of 100Hz. The MM74C926 CMOS IC contains a four-digit decimal counter that can latch a given count and then use this....
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Through simple circuit modifications, designers can use peak current limiting to produce a constant current source....
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The FM497 is an integrated electronic ignition controller for breakerless ignition systems using Hall effect Sensors The device drives an NPN external darlington to control the coil current providing the required stored energy with low dissipation. This....
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Crystal Y1 develops a 14. 31818MHz fundamental frequency clock signal. U31 is a Dual Voltage Controlled Oscillator. The output on pin 10 is a 14. 31818 MHz clock signal called the color clock. R27 can be adjusted to obtain exact output frequency. U30 is a....