Popular Circuits Page 149
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The expander to complement the compressor is shown. An external op amp is used for high slew rate. Both the compressor and expander have unity gain levels of 0 dB. Trim networks are shown for distortion (THD) and de shift. The distortion trim should be....
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The TDA9302H is a monolithic integrated circuit in HEPTAWATTTM package. This is a high efficiency power amplifier for direct drive vertical rolls from the yokes of TV. This is intended to be used in Color and B & W television as well as in monitors and....
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Zero crossing detector(ZCD) is a voltage comparator that switches the output between +Vsat and Vsat (Vsat: Saturation voltage almost equal to 14V) when the input crosses zero reference voltage. Then what is a comparator In simple words comparators are basic....
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As shown by IF processing circuit (MC1350) and video detector MC1330AP combined video circuits. Is modulated depending on the image signal IF carrier frequency (45 MHz) is supp..
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Digital Cameras -DV machine power supply circuit It shows a digital camera/DV machine power supply circuit, the circuit MAX1800 chip to control the core. The figure shows that ..
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The transmitting section of this infrared tx-rx is unusually simple but it works rather well: the infrared LED pulses at a frequency of 160Hz and its range, with its receiver, is between 2 and 4m depending on the transformer used and the setting of the 100k....
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This is the DOD Overdrive 250 preamp circuit diagram. The DOD Overdrive 250 is Yet Another 741 With Two Diodes On The Output channel. It is almost exactly the same as the MXR Distortion Plus, and a number of other units. Download the DOD Overdrive 250....
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Most Apple and Windows PCs can be put to "sleep" or "standby" mode while not in use rather than shutting them down completely. This mode has the advantage thatwhen they wake from sleep via keyboard or mouse activation, the operating systemrestores all....
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The ckt is built around two 555 timer ICs. U1 and U2. U1 is wired as a variable duty cycle oscillator with a constant time period of around 0.1 second. Duty cycle can be varied from 0 to 100 per cent by R4 potentiometer. The output of U1 (pin 3) is connected....
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A very simple white led driver schematic circuit can be designed using the EL7513 constant current boost regulator specially designed for driving white LEDs. It can drive 4 LEDs in series or up to 12 LEDs in parallel or series configuration and achieves....
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n the view of the dramatic drop in the price of crystals used in color TV sets, they now represent an economical way of building an SSB filter. The circuit shown in the diagram is for a filter with a 6 DB band width of roughly 2.2 KHz. By terminating the....
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Electronic lock using the telephone key (resistor connected plug) is inserted after the oscillator circuit start-up circuit, and the oscillation frequency is accurate or not to..
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The second-order multipurpose filter described here can perform as a low-pass, bandpass, high-pass, or notch filter at audio frequencies. What makes this filter unique is that all of its characteristics can be varied independently with potentiometers. In....
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The heart of this circuit is IC No. 555. When the alert sound was working, even though the switch will continue to be the same, the sound still does not stop immediately. But it will stops automatically, when a set time period, Depending on the resistance of....
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The A3425 is a dualoutput-channel, bipolar Switch with each channel comprising a separate complete Hall-effect Sensor circuit with dedicated Hall element and separate digital output for speed and direction signal processing capability. The independent Hall....
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A hexapod walker robot that uses three servos. It uses a Parallax Basic Stamp I for its brains, and let me tell you, its all this controller can do just to make the bug walk! Walking is MUCH more complex than just rolling! I will have more details and pics....
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This preamplifier was designed to cope with CD players, tuners, tape recorders etc. , providing an ac voltage gain of 4, in order to drive less sensitive power amplifiers. As modern Hi-Fi home equipment is frequently fitted with small loudspeaker cabinets,....
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This is a low-cost and simple intercom circuit design which utilizes 3 transistors. Even a newbie can assemble it on a piece of veroboard without difficulty..
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As shown in Figure as a switching power supply to work with linear regulated power supply. Its characteristics are: high efficiency, low dropout; having the ability to filter o..
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As shown in FIG by DN-25 IC switching power supply. DN-25 is a monolithic switching power supply device, suitable for the production of medium output current, wide voltage rang..
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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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Once the case temperature reaches 250C the device must be derated up to a maximum case temperature of 1500C, insuring the junction temperature remains below the maximum permissible temperature. MIL-PRF-19500/543; Semiconductor Device, Transistor, Field....
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Figure 1 shows a 5V to 12V boost converter ideal for USB
applications. The converter has a selectable 100mA/
500mA input current limit, allowing the device to be easily
switched between the USB low and high power modes.
Efficiency, shown in Figure 2,....
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Common mode input voltage up to difference l00V enlarged circuit diagram: ..
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Built around a 555 timer IC, this pulse generator can be built into a probe for logic..
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The LM3875 is an audio amplifier for high power output capable of delivering 56W of continuous average power to a load 8. The performance of the LM3875, utilizing its maximum instantaneous auto temperature ( ° Ke) (Spike ) protection circuitry, places it in....
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As shown, the use of the operational amplifier A for audio preamplifier circuit. The advantage is small size, low noise, low power consumption, good consistency. A operational ..
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The concept of an AC model for the triode is presented and the equivalent circuit technique is described. Theoretical calculations for amplifier gain and frequency response are derived and compared to simulation results in the SPICE3 environment where good....
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This circuit was designed to allow microphone cables or other cables to be easily tested for intermittent breaks that can often be difficult to find using a multimeter. The circuit can test cables with up to four cores. Both switches used in the circuit are....
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Above, the saturation region starts at the knees on the left. We`re interested in curves for negative gate voltages (depletion mode). Note that this device also operates in enhancement mode (with positive bias)! Flexibility. The construction method for this....
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This simple circuit can be used to activate whatever you like, for example, by connecting it to microcontroller, relays, secret alarms, robot applications or just turn on LED1 which lights up as long as you touch the metal plate. The circuit consists of....
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Adjustment potentiometer RP, can change the charging current. ..
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It's a very simple circuit, for the follow-up of baby. It can however be also used for other use, as intercom etc. In the place of M1 we can we use a simple electret mic capsule. The regulation of gain becomes from the R1, whoever can be trimmer or....
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Often the frequency of a signal must be doubled: modulator/demodulator chip LM1496 is an ideal basis for this. From..
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Flash slaves are used when you need to supplement one flash unit with one or several more. This slave trigger simply triggers those other units. It does this by "seeing" the first flash (using a phototransistor) and triggering the other flashes a few....
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Watch the video given below to get a better idea on how LED works A light emitting diode (LED) is known to be one of the best optoelectronic devices out of the lot. The device is capable of emitting a fairly narrow bandwidth of visible or invisible light....
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The converter shown uses a member of the TinySwitch-III family (U2, a TNY279PN) to provide up to 1. 8 A of load current to six, high-intensity, Luxeon LEDs (the LXHL series). The output voltage is slightly below the forward voltage drop of the LEDs....
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In this open-loop design, the detector diode is Dl, and a level shifting or compensating diode is D2. Load resistor RL is connected to -5 V, and an identical bias resistor RL is connected to -5 V, and identical bias resistor RB is used to bias the....
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Here`s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring....
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The shift pulse amplitude is less than 15 volts. If a stage is off, the shift pulse will not be coupled to the next stage. If it is on, the diode will conduct triggering the next stage. Just prior to the shift pulse the anode supply is interrupted to turn....
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At present, more and more patients with osteoarthritis, osteoarthritis to relieve the tremendous suffering to the patient, so that patients return to normal life. In this case ..
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Electron tubes How Electron tubes work, Early tube history, The triode, The tetrode, Beam power tubes, The pentode, Combination tubes, Tube parameters, Ionization (gas-filled) tubes, Display tubes, Microwave tubes, Tubes versus Semiconductors Electron tubes....
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The device used for measuring daily insolation has been developed. The device was built with a PIC18F458 and the 128MB Multimedia Memory Card, MMC. The sol....
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Single-ended primary inductance converter (SEPIC) topology is a good choice for automotive power systems that require an output voltage between the low and high values of the input voltage. SEPIC topology fits this application because its duty ratio can be....
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It delivers safely around 20Amps at 13. 8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have got here. The power transformer should be capable to deliver at least 25A at 17.....
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This is the low cost AVR programmer using attiny2313. The schematic diagram is given below.
First setup the circuit as shown. One important care taken to make fuse bit
avrdude -c usbasp -p t2313 -U hfuse:w:0xdf:m -U lfuse:w:0xef:m
If you use serial port....
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An AC coupled unity gain gain voltage follower operating on a single supply is shown here. The voltage divider network of R1 and R2 provides a DC voltage equal to half the supply voltage to the non-inverting input of the 741. The output DC voltage therefore....
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This SPI Flash Programmer can be used either for in-system programming or as a stand-alone serial flash programmer for the Atmel SPI programmable devices. The programmer hardware interface is controlled by the PC parallel port and the parallel port control....
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To invoke the Spectrum +3 diagnostic routines, first reset the machine while holding the BREAK key down. This will go into the test card dispray. Now hold down the QAZMLP keys for a few seconds unti the diagnostic title is displayed. Now follow the on screen....
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The Hakkit robotics shield is a breakout kit for the Arduino Uno R3. When assembled the shield gives five standard servo headers taking advantage of the PWM pins on the Arduino and breaks out the analog pins to give six inputs for sensors. This shield is the....
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This circuit mixes H synch. V synch. and actual video. T2 mixes the synch, while T1 serves as an emitter-follower. Bandwidths of up to 25 MHz are typical for this circuit. ..
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A block diagram of the stereo-TV decoder is shown in A. It shows the overall relationships be-tween the separate sections of the circuit; B through E show the details of each subsection. The de-coder section centers around IC1, a standard 4. 5-MHz audio....
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Remote control using VHF modules. A few designs for remote control switches, using VG40T and VG40R remote control pair, are shown here. The miniature transmitter module shown in Fig. 1, which...
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The IR Theremin hardware schematic is deliciously simple in that the main input and output devices do not require many connections. This is usually a mixed blessing because less hardware, often means more software. The main devices used in the circuit are....
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8 parallel input/serial output interface circuit as follows: ..
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This is a design circuit for low current relay circuit is designed to be used in battery operated electronic devices. Its operating current is in micro amperes ( µA). This is done by using a bistable relay and adding some components to force the relay to....
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This circuit shows the basic UJT building block (Fig. 9-1), which is used in a light dimmer with soft-start operation that applies current to the light slowly enough to eliminate high surges (high inrush current). These current surges, found in most....
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Voltage Doubler circuit and Voltage Inverter circuit diagram with schematics using MAX660 IC -which is a DC voltage multiplier IC. This is a dc voltage doubler circuit and inverter....
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The circuit in Figure 1 is a keypad interface that solves this problem by using an ultralow-power microcontroller. The circuit typically consumes 100 nA while awaiting a key press and consumes a maximum of only 2 µA if all keys are stuck or held down. An....
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The following circuit shows about TL163 IC For Ultrasonic Remote Control Circuit Diagram. Features:detector, high-gain amplifier, low-frequency ...
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Just a nitpick, you don`t have the Leds in Parallel with the transistor. If you did, the leds would be on when the transistor is off. You have them in parallel going into the transistor. All the transistor sees is n times led current going through it. It....
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This article describes the steps involved in concieving and realizing the interactive art installastion ""Rain"", also known as ""Umbrellas"". It is intended for anyone who wants insight in the parts that make up an interactive installation....
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Transformer OCL and capacitor C1 form a tank circuit, to which are coupled sufficient turns to drive the grid in the lower left-hand winding. The output circuit is coupled by a separate winding. For good wave shape in such an oscillator, triodes and class B....
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The single speaker amplifier circuit uses current feedback, rather than the more popular voltage feedback. The feedback loop is from the junction of the speaker terminal and a 0.5-0 resistor, to the inverting input of the NE5534. When the input to the....
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This is my long history the device that controls my home`s night light, air-conditioner, etc. The device is a Miniature Real-time Controller. The circuit uses only three chips, a 89C2051, DS275(or MAX232), and 74LS07 open collector driver. The scheduler for....
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For digital modes the ideal receiver must be very simple, front end selectivity, manually adjustable gain, IF filter. All the goodies you can find on the HF receivers can be done by software. In my junk box there were one surplus 1. 4 MHz, 3 kHz wide Xtal....
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Many systems that require a user to manually enter data feature a keyboard similar to that in Figure 1. Although early keypads comprised arrays of individually wired switches, a typical modern keypad comprises a matrix of x and y lines. Pressing a key....
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The popularity and easy access of RS-232 ports lend them to many communication projects. You can use a port as is” or as a tiny parallel port when the exchange uses only control lines. Before the asynchronous serial-data transfer between two devices can take....
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One of the control circuit"s triacs selects the tap on main transformer Tl, which provides the proper, preregulated voltage to the secondary regulator. T2 and its associated components comprise the secondary regulator. The ADC 0804, IC1, digitizes a....
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In many situations you need some kind of human interface to your microcontroller project. In this example is interfacing AVR microcontroller to standard PC AT keyboard described. According to keyboard timing diagram in bellow picture the keyboard transfers....
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Though it`s the world LEDs today, an ordinary flashlight bulb can also be considered a useful light emitting candidate especially because it`s much to configure than an LED. However, the moment AC mains fails, T1 is instantly forward biased, it conducts and....
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This type of voltmeter is very common because of its low cost. This instrument can be used only to measure voltages of the order of milli-volts owing to limited amplifier gain. The circuit diagram for a direct coupled am plifier dc voltmeter using cascaded....
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Economy radar detector Circuit diagram This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and the second op-amp buffers the output to....
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Although the TDA2030 can deliver 20 watts of output power, I deliberately reduced the output power to about 8 watts to supply 10 watt speakers. Input sensitivity is 200mV. Higher input levels naturally will give greater output, but no distortion should be....
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on the desired temperature. The circuit can be used for many purposes for example switch on the fan on the desired temperature or activate emergency temperature alarm etc. The circuit can be powered by a 9 volt battery, adaptor or transformer. The two BC547B....
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(Almost) Trivial application of an AT90S2313 or ATtiny2313 in an alarm clock to change the alarm from "BEEP BEEP BEEP BEEP BEEP BEEP BEEP BEEP..." to "WAKE UP" in Morse code. This was designed in response to a request and is in daily use. An inexpensive....
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This simple to construct water fishing thermometer circuit is intended to be used in sports applications like for example a fishing contest. A sensor measu....
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A number of operational amplifier circuits are provided here that are set up to be squarewave oscillators. A squarewave is a Periodic Wave pulse train with a 50 percent duty cycle. The operational amplifier is really just a high-gain amplifier, so....
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Transformer Tl can be any matching transistor type in the range of 500/500 to 2500/2500 ohms. No connections from the SCR or its components are connected to ground. For safety's sake, keep the 117-V line voltage from the amplifier connections— that is the....
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line follower robot which is going to follow the line on the track. in general line follower robot is controlled by a microcontroller...
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220V electric vibrator is inserted clip, FU is the fuse. ST is inveterate like device, HLl HL2 are insulation and heating instructions. - Light, EH heater. When boiling, the po..
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With these, you can make your very own security system that gives intruders a sporting chance! It`s the laser-version of saying But before I kill you, Mister Bond This laser tripwire system will trigger an audio alarm (made from a 110dB piezo personal....
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This is a 555 tone generator circuit based on NE555 timer IC. NE555 is a very famous IC used in many circuits and performs variety of tasks. In this circuit the IC is used as an astable oscillator and the circuit will generte a tone when power is applied.....
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This circuit use TA7222AP to amplifiers audio signal. The price only $0. 99 and can provide 5. 8 watt with Muting Control. Power supply can use for 8-12Vdc it is a good idea to use for car audio power amp, coin-op machine game, security system etc...
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In order to assist the video design engineer in using Gennum's
GX4201 video crosspoint, an AC equivalent circuit has been
created. A PSpice® netlist of the circuit has been generated
and is available on floppy disk.
The equivalent circuit is for AC....
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This FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at night when it is parked in the car porch or car park. The receiver unit with CXA1019, a....
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This simple programmer will accept any device that`s supported by software. The circuit is based in part on the ISP header described in the SILICON CHIP "PIC Testbed" project but also features an external programming voltage supply for laptops and for other....
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