Popular Circuits Page 85
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This circuit operates like the one shown in Fig, 57-4, The only differences are that the field is placed across the rectified supply and the armature is placed in the SCR bridge. Thus the field current is unidirectionali)ut armature current is reversible;....
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This .circuit for starting arc jets and controlling them in steady operation is capable of high power efficiency and can be constructed in a lightweight form. The design comprises a pulse-width-modulated power converter, which is configured in a closed....
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I`ve decided to start selling these on ebay to raise some money for parts. Here`s a link to the current auction and here`s a photo of the current model: Switchgate is a simple dual gate based on a 556 in monostable mode (with trigger input), with the....
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All the stages involved are actually for enabling a frequency response of 20 to 100kHz, though here we wont need such high degree of frequency response, I didnt eliminate any of the stages as it wouldnt do any harm to the circuit. The first stage consisting....
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The schematic seen below uses all the hardware components we`ve seen up to this point. If you`re following along with this tutorial be sure to follow it exactly as seen below. If you don`t have 220k resistor use the closest value you can find near it,....
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With a GPS receiver that costs less than a few hundred dollars you can instantly learn your location on the planet-your latitude, longitude, and even altitude-to within a few hundred feet. The output of the VCO is directly connected to a MMIC IC3. This IC....
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In the circuit, the adjustable prestage is composed of transistor AF279, and the natural oscillation mixer stage consists of transistor AF280. The power circuit is installed on the board with copper coating. The main coil data:L1, L3, L8, L9: eight turns,....
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We decided to design and build a robot capable of vacuuming the floor of a room or area without any human interaction other than just starting the unit. We realized the need for a cheap and convenient product that can be easily used to vacuum a room on its....
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Before starting on the receiver side of the` Chatterbox`, we ought to take a final look at the transmitter itself. The Chatterbox transmitter is built separately, because many constructors will want to use it in conjunction with an existing receiver on 1.....
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This circuit generates the sound of the electronic ringer found in modern telephones, supplanting the 2-bell electromechanical ringers used previously. The ringing pattern follows the United States convention of 2 seconds on, and 4 seconds off. During the....
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Six timing positions suited to different skin types, Timing affected by sunlight intensity This timer was designed for people wanting to get tanned but at....
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Darlington is a tube made double clam touch switch circuit is characterized by a touch sheet and 20V AC mains through the power transformer T isolated, relatively safe. After t..
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The CIRThis article will show you how to build your own version of the Fire-Stick infrared remote control system. The Fire-Stick has been an extremely popular, and HOT selling item here at Rentron.com for quite a long time. The LITEON infrared receiver....
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Is a light remote control light switch circuit, remote control toys can be sufficient flashlight or laser pointer. Use as long as the torch for a photo at the photosensitive resistor RL2, RI.2 resistance was low, VT2 immediately turned on,..
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The pitch of the tone is dependent upon the resistance under test. The tester will respond to resistance of hundreds of kilohms, yet it is possible to distinguish differences of just a few tens of ohms in low-resistance circuits. Ql and Q2 form a....
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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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As you can see in the circuit diagram this LM317 power supply electronic project require few external components. The input voltage required by this electronic project must be between 8 and 35 volt, and will provide a variable output voltage over a wide....
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This is the simple version of a white LED lamp that can be directly powered from mains. It can give ample light even for reading purpose. Capacitor Cx alon....
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This is a simple low-level noise maker that`s ideally suited to certain alarm applications. When the sounder is located in another part of the building, the sound level is loud enough to be heard, but is not loud enough to warn off an intruder. A single....
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This is circuit that first introduced by Signetics Corporation as the SE555/NE555 about 1971. Pin connections and functions: (See schematic below for basic circuits). Pin 1 (Ground) The ground (or common) pin is the most-negative supply potential of the....
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here is a pic running 36v 500ma on the front, 36v charging on the back. Brightness is approaching level of a 240v globe, considering its a 20 watt....
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The capacitors C5 give with IC1, The resistor R1, R2 and, capacitors C1, Which build the circuit model astable multi vibrator Square wave generator, at the frequency about 2KHz come out the way pin 3 of IC1. By have capacitors C3, C4 diode D1 and D2. Which....
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The following circuit shows about Electrical Circuit Diagram For MR2 MKII Electric Aerial. Features: controlled by an ‘Aerial Control Relay , consisting of ....
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Make two telephones ring onstage. This involves sending a signal down a line to the phones. I was hoping to find an old telephone exchange system, but no luck yet. I have found a few ideas for circuits, but would ideally like to make a ringer output that is....
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This is the pulse width (time) / voltage conversion circuit, according to the diagram component parameters, it can convert 0. 1 S pulse width into 10V output voltage. When time pulse input end is added input conversion pulse, the analog switch Sl is....
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A power supply with frequent energy switching; but the schematic is incomplete. I should add another circuit which controls the voltage polarity converter (Four transistors). The circuit generates high frequency current pulses. @CamilStaps Actually I didn`t....
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As is the use of thyristor controlled unidirectional flashing lights string controller, diodes VTI, VT2 connected to a multi-I are from Che oscillator, after power, VT1, VI12 t..
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Two circuits of audio tubes amplifiers...
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A diode is used in series to drop the voltage down to 5. 4 V as the operating voltage for the PIC microcontroller should be below 5. 5 V. Besides, the diode also provides the protection to the circuit in case of reverse polarity of the power supply. I have....
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LCD initializations in 8051 C programming words What is the logic behind the serial communication As in, how long should the SIG send out pulses and what should the delay be These statements are used to tell the compiler that a 16X2 LCD is connected to the....
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The circuit charges and discharges a capacitor at a crystal-controlled rate, and stores on a sample-anddifference amplifier the change in voltage achieved. The current that flows during the discharge cycle is averaged, and ratiometrically measured in the....
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A transducer senses a direct current magnetically, providing isolation between the input and the output. The detecting-and-isolating element is a saturable reactor, in which the input current, to be measured, passes through a one-tum control coil. The....
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This circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception...
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A simple 12V to 24V dc dc converter circuit with diagram built around LM324. This boost converter with schematic can provide up to 800mA output current and a steady 24V DC....
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An RF condenser design, it was powered by 12v, supplied to the microphone via the mike cable using a phantom circuit. This is the first known usage of a phantom circuit for microphone powering[1]. Sometime around 1970, Neumann introduced the Fet-80 series of....
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Once you discover how to setup an RS232 connection, it`s really just cut-and-paste for future projects. Please note this is a relatively compact SMD version of the power supply. This can easily be obtained with through-hole components using a breadboard.....
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Following the 4th Apple iPad charger failing and not wanting to spent even more money with Apple to replace them we decided to try to make 12v powered chargers to make use of the excess PV power we now have during the daytime to charge the iPads and other....
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Ql and Q2 form a constant current drive defined by R2. (I approximates to the reciprocal of R2 in the circuit shown for values of I greater than 1 amp). The pulse current is drawn from Cl which is recharged during the time between pulses via Rl.
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The series of decibel meter function to determine the level of signal strength that is given to the speaker on the audio system. Decibel meter circuit is often also known as the VU meters on audio hifi system. For a series of decibel meters in this article....
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This circuit was designed as an aid in parking the car near the garage wall when backing up. LED D7 illuminates when bumper-wall distance is about 20 cm. , D7+D6 illuminate at about 10 cm. and D7+D6+D5 at about 6 cm. In this manner you are alerted when....
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This is one of the original brand-name folders created for the site, and for almost three years it has been empty, just someone`s distant memory - suddenly we have a nice pic and the circuit of the preamp. Thanks Richard. I`ve only a pre amp cct I traced....
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This application note interfaces a midrange PICmicro
device to a Hitachi LM032L LCD character display
module, with a two line by twenty character display. LCD
modules are useful for displaying text information from a
system. In large volume applications,....
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DAC0832 shown in Figure 27-13 cushion in the form of a single-phase circuit connected with 8086CPU. Since DAC0832 internal 8-bit data input must be set between the CPU and D/A ..
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Sometimes when experimenting with different soundcards and MIDI interfaces it is useful to see if there is some data going in MIDI interface. This can be easily tested with this adapter, which converts the midi signals to visible light pulses. Just the....
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Tape output circuit by the left and right channel signals through the first buffer amplifier, the output signal of two routes, all the way directly to the amplifier amplifies the other way into the end-pass filter for filtering...
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My Friend need to like a Pulse Generator Oscillator circuit that stable frequency at 32.768KHz,for digital cmos binary counter, so he tell to me even low....
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A copy from an old italian magazine of amatorial electronics, proposing an add-on for tube receivers. The add-on was a simple one-tube short-wave transmitter leveraging the same power supply already available in the receiver. This circuit fascinated me when....
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I built this cable for my Casio QV-200 digital camera, it should work for many Casio models. It`s basically a inverting buffer/converter to/from RS-232 voltage levels from/to CMOS levels. Why Casio didn`t put this inside the camera like everyone else does is....
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Very interesting points Chris and Thoersten, but I`d like to make a little step back. So, talking about my lastest design, this schematic attached....
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Ll, Ql, L2, and L3 compose an RF amplifier stage that feeds Ml, a doubly balanced mixer. Q4 is a l..
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The Arduino microcontroller board is able to supply a current of 40mA from its output connections. These digital outputs are fixed at 5V ON or 0V OFF . This is adequate for working with LEDs but devices such as motors, solenoids, high brightness LEDs etc.....
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This schematic is provided in the hope that it will be useful, but without any warranty, not even a warranty of merchantability or fitness for a particular purpose. The address bus in this schematic is connected in an unusual way, which is optimized for....
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This circuit is used to slowly illuminate and fade a pair of red LEDs (light emitting diodes). The fading LEDs could be installed as 'eyes' in a small pumpkin or skull as a Halloween attraction, or mounted in a Christmas tree ornament. Or, they might be used....
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Using one current source for tbe charge and discharge path in this circuit ensures identical rise and fall times at the capacitor terminal. A Darlington pair ensures identical biasing of the IC during the charge and discharge cycles. The period of the....
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This Instructable describes the installation of a SPY5000 two way motorcycle alarm with a Honda 1998 CB250 Nighthawk motorcycle. This Alarm is rat....
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This audio amplifier design approach employs TMOS Power FETs operating in a complementary common- source configuration. They are biased to cutoff, then turn on very quickly when a signal is applied. The advantage of this approach is that the output stage is....
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JBD3-10 leakage protection circuit "0" cellpadding = "0" cellspacing = "2" method = "post" action = "/ e / search / index.php" obj.saytext.focus;} catcherr {}} catcherr {} $ function {$" # select_se....
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Most of the peripherals that interface with PC uses USB port. The computers power supply circuit of SMPS will be designed to maintain constant power to all computer parts only. however we connect external peripherals to PC that requires significantly large....
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With the 10KG potentiometer, you can vary the contrast from dark to bright. When the potentiometer is near 0G , the screen will be very dark. As you turn the potentiometer up to 10KG , the screen will become brighter. ..
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Measures a-c voltages between 95 and 135 v with 0. 6% accuracy while using ordinary 2% accuracy meter. Zener diodes provide reference voltage. -D. S. Belanger, Simple Circuit Increases Measurement Accuracy, Electronics, 38:22, p 69. ..
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This astonishingly simple circuit allows one or two powerful 12V 21W car bulbs to be driven in flashing mode by means of a power MosFet. Devices of this kind are particularly suited for road, traffic and yard alerts and in all cases where mains supply are....
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This is a stereo VU booster circuit diagram based on transistor FCS9014 which usually used for pre-amp and regulator circuit. This circuit should be connected to audio channel before amplifier module. If you are using tone control or equali....
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This simple circuit consists of only two timing components Rr and Cr, the NE555, and bypass capacitor C2. While not essentiaHor operation, C2 is recommended for noise immunity. During standby, the trigger input terminal is held higher than 1/3 Vee and the....
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This is a small circuit insect repellent, mosquitoes and birds, or other methods to produce high frequency audio signals. Interfere with the hearing of insects. Make it insufferable, wings to escape in the end. Operation of this circuit is used IC1 number....
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You may be wondering why I am using four tubes. The reason is to get 50 watts without pushing them right to their limit. My tube manual gives two setups for EL34s in ultra linear. Both require a 6 k ohm transformer. Both setups use exactly the same voltages....
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By cross-connect telephone ringing circuit, when the phone rang, the circuit closes the relay. It uses the delay in contact, thus to drive any bells, sirens, buzzers or lights...
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In the following astable multivibrator circuit, in some books, it is mentioned that the duty cycle id d=( R1+R2)/(R1+2*R2) in some other books, it is....
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By adding discrete inductors in series with the device, we can œtune out some of the capacitance, and improve the eye opening. If we add enough inductance to peak the 3rd harmonic of 240 MHz, with the capacitance of the device and any added board....
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Circuit uses a simple RC network to produce an exceptionally shrill tone from a miniature speaker. With the parts values shown, the circuit oscillates at a frequency of 3 kHz and drives a miniature 2W speaker with ear-piercing volume. The output waveform is....
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The circuit`s 90% conversion efficiency offers a distinct power-saving advantage over resistor-limited and linearly regulated designs. It might appear that a series-LED connection is unsuitable for applications in which some (but not all) LEDs must be off. A....
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At startup, the voltage in the trigger input at pin 2 is less than the trigger level voltage, "13 VDD. caus ing the timer to be triggered via pin 2. The output of the timer at pin 3 becomes high, allowing capacitor c, to charge very rapidly through diode Dl....
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AVRtools has an intuitive graphical user interface, and is based on the use of predefined function blocks. It offers a large range of basic functions: timers, counters, logic, analog signal processing, etc . Included are function blocks for sending SMS....
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This two-stage audio preamplifier is intended for use with high-fidelity magnetic phonograph pickups. The overall gain of the circuit is about 150. The circuit is from the RCA tube receiving manual and meant for use with the famous RCA 7025 twin triode.....
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An electronic recitification circuit. The use of large, heavy and expensive electrolytic capacitors is avoided, being replaced by an active transistor in this gyrator circuit. To avoid excess ripple output on a power supply feeding a heavy load, usually a....
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One of my friends asked me if I could design a circuit for him to be able to remotely power up a server. He has 2 servers and he didn`t want to keep them both on whilst he travelled. He wanted to be able to turn on a server when he needed it. He has one....
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Constituted by a 5V TOP414G, 2A output isolated switching power supply circuit is shown. C1 is the input filter capacitor. VDz VD1 composition and primary clamp protection circ..
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By selecting an attenuation switch to change the pitch of a feedback control circuit transition frequency real cases. Hu) for 2 treble controls,..
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The first amplifier circuit is a bird phone. In this circuit, the electret mike (MIC1) is mounted in the neck of a large plastic funnel. The amplifier, built around an MC34119 (which is available from D.C. Electronics, P.O. Box 3203, Scottsdale, AZ....
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74HCU04 is a chip that was made for this purpose, HCT may not work for such a circuit. C1 and C2 can go to upto 33pF and R2 can be increased to make R2 * C2 = t. The circuit above is a parallel resonant oscillator circuit. The Crystal works by the....
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The pulse width of the compact pulse cum frequency modulator can be varied by altering the change-over point of comparator IC1 with a control voltage via....
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Circ?it to close a relay when any phone extension is off-hook. Uoltage at the gate of the MOSFET sho?ld be negative (1-3 volts) with respect to the so?rce then phones are on-hook. Uoltage at the gate sho?ld be positive (8-113 volts) with respect to the....