Popular Circuits Page 5
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The ISD1000A is a Direct Analog Storage device which allows you to store 20 seconds worth of voice data on an IC chip which can be play backed anytime. The data stored will stay in memory even if the power is removed. To use the circuit below simple apply....
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AVR Microcontroller And Best-in-class 2. 4GHz RF transceiver ATMEGA128RFA1 is an IEEE 802. 15. 4 compliant single-chip, combining the industry- leading AVR Microcontroller and best-in-class 2. 4GHz RF transceiver providing industry`s highest RF performance....
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This is a simple arduino project for a soil moisture sensor that will light up a LED at a certain moisture level. It uses Arduino Duemilanove microcontroll....
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Here is the full schematic for the driver. I chose to use a PIC16F628 as the microcontroller because it is cheap, has a internal oscillator (4 MHz) and an internal USART. NOTE: There is an error in this schematic and a pull-up resistor on RA5 (pin 4 in the....
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This simple tone control can be used in may audio applications. It can be added to amplifers, used as a stand alone control module, or even built into new and exciting instruments. It`s one IC construction makes it a very compact circuit, as only a few....
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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 main box of the Transmit Selector system is designed to be located in the technical rack of a small radio broadcast station. There are four stereo balanced line inputs, either of which can be routed to a stereo balanced output. The signal routing is....
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When activated, the transmitter sends out a 49.890-MHz, AM rf carrier. The.receiver detects, amplifies, and decodes the rf signal, which, in turn, activates a piezo buzzer. The receiver is small enough to carry in a pocket or sit on your workbench. ..
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This is the circuit diagram of touch activated alarm system which still activated on load shedding. Alarm system will be activated when someone touch the touch plate which is called trigger. In this circuit the most updated part is automatic battery....
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This is a 5V to 12V DC-DC step-up (boost) converter circuitry that is especially ideal for the USB powered applications. First of all a USB port has two current supply modes. Before detecting the connected device, it supplies maximum 100mA to the load. After....
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DC motor control circuit using NE555 Are you familiar with all the applications of 555 timer circuits If not, we can help you. We all know that for better understanding, the best source is an authenticated book on the subject. CircuitsToday presents an....
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As no one wants to listen to discriminator noise, the proper operation of the squelch circuit in any FM radio is vital. In a repeater, the squelch / COR is even more critical. The basic function of a squelch circuit is simple: detect the presence of a radio....
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I found the following schematic from online sources. It’s about generating and launching ions. I did not built this circuit. But I’ll present some ideas on how to focus ions so that they will travel a longer distance. ..
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The locker alarm circuit or cashbox watcher can be used to protect a cashbox/locker from unauthorised access. This tried and tested design forms a fool-proof,remotely operated alarm/electromagnetic relay driver that receives its control signal from a....
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Agreeable, very close sound imitation, Suitable for sound effects, door-bells etc. This circuit generates a two-tone effect very much alike the cuckoo son....
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There is, and always has been, a marked lack of good, inexpensive lighting controllers for small theatre groups or musicians. The LX-800 Lighting System was designed with these applications in mind...
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In microprocessor control of multiple loads, the minimum cost per load is critical. A typical application example is a large display involving driving arrays of incandescent lamps. This circuit provides minimal component cost per stage and optocoupler....
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The Amazing All-Band Receiver is basically a diode detector followed by a high-gain audio amplifier. This is not a multi-band receiver; it picks up everything at once! The detector uses a biased Schottky diode for excellent sensitivity and bandwidth; the....
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No Description available...
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The temperature controller must meet some unusual
requirements. Most notably, because of ambient temperature
variation and laser operation uncertainties, the controller
must be capable of either sourcing or removing heat
to maintain control...
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Filter Wiz PRO active filter designer version 4 has just been released. Version 4 represents a major advance in the rapid design of stable and effective active filters...
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This circuit is used to convert a mono audio signal into a stereo signal that can be panned between the left and right channel by a 0-10V control signal, it is intended for analog synthesizer systems...
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Circuit shown in Figure 3-148. The circuit eliminates the need for step-down transformer, using thyristor for brake control, for small capacity asynchronous motor braking amoun..
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A stereo power amp designed for use in portable players and radios. A 3V supply can be used to drive headphones providing 20mW in 32 Ohms per channel. ..
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The circuit is built around a 555 oscillator/ timer. The circuit provides two time periods. The long-running time period is adjustable from about 1 to 10 minutes, and the short time period is preset to about three seconds. Here`s how the dual timer....
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Working on the brightness problem, I know that the 4017 design did not work well because there was no way to turn off the sign while updating the shift registers. As a result I went back to having the Arduino directly drive the TIP120 drivers. Another....
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This series-feedback series of compounds give a high input impedance and stable, gain wide-band video amplifier for general purpose applications. Low Capacitance, High Impedance, Amplifier Circuit,...
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The 7th overtone of 18mhz (17m) is 144mhz (2m) smack dab in the CW region. Icarus a HAB project run on advertising revenue that seems successful and has launched many balloons with some awesome photos. Robert Harrison knows his stuff! Lessons in Electric....
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Setup the lights on the breadboard like a traffic light. Red on top, then yellow, and then green. The small red and green are the pedestrian crossing signals. Again red on top and green just below. Put the buttons in so you have at least 2 pin holes space to....
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Figure 1-99 with a five-band equalizer equalizer circuit TA7796 specific integrated circuit composed of the circuit in the public electricity voltage amplifier, an analog induc..
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This circuit adds a power down function to analog I/O ports (for example, the AD7769 and AD7774). Moreover, the diodes ordinarily needed to protect the devices against power-supply missequencing can be
eliminated Bringing the power down control high....
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This is an image Schematic. No Description available...
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By utilizing both halves of the dual timer it is possible to obtain sequential timing. By connecting the output of the first half to the input of the second half via a 01 µ-F coupling capacitor, sequential timing may be obtained. Delay ti is determined by....
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A2N3819 FETprovides a solid-state VOM. The 2N3819 acts as a cathode follower in a VOM. The bias offset (meter null) is obtained with R14 and R12 sets full-scale calibration. R2 through R9 should total about 10 MO. ..
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This page provides basic information about voltage comparator integrated circuits and is to act as reference material for other circuits. The circuits shown are based on the LM339 Quad Voltage Comparator chip or the LM393 Dual Voltage Comparator chip. These....
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Using this circuit will give Good Charging results to a Gell Cell or SLA type Batterys as used in my Metal Detector project. And it can be modified to accomidate higher current batterys. It is Probably quite Suitable for up to a 10 A/H Rating ..
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The Sennheiser MKH 415 T is a medium shotgun microphone, powered by the 12VDC A-B standard (aka DIN 45 595, aka T power). It was the forerunner to the popular MKH 416, which is still made. According to Sennheiser lore, the original MKH 415 prototype was....
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This is a "beta release" schematic. Use at your own risk The idea is to add this circuitry to a board with already has ram at 2000 and an 82C55 I/O chip to provide ports A, B and C. Warning: not shown here is a memory mapping trick which is described below.....
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If you are developing applications for the PIC mcu, and miss debugging tools, or don't have enough I/O pins for a parallel LCD interface in your design, this serial interface can help printing debug messages and/or reduce the pin count. This version uses a....
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The circuit comprises two sections: charger power supply and LED driver. The charger power supply section is built around 3-terminal adjustable regulator (IC1) LM317, while the LED driver section is built around transistor BD140(T2). In the charger power....
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Similar to the CMOS based Touch Switch also on this site, this transistor based touch switch can activate a load simply by the user touching a metal plate. It is designed to directly switch a relay to allow it to be used with large loads. As it uses only a....
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This is an enhanced version of the simple Garage/Shed Alarm. The Entry and Exit delays have been increased to about 30-seconds - and I`ve added a timed Siren cut-off and automatic Reset. I`ve also replaced the LED with an entry Buzzer. These enhancements....
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The streamliner passenger car came into existence just before W. W. II as parts of dedicated passenger car and locomotive consists. They were designed to be lightweight to allow high speeds with a single rather small diesel engine. Eventually the railroads....
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220V AC by R3 buck figure, VDI rectifier, VD2 and C3 filtered output voltage of about 3,9V DC supply set to block BA5173 electricity. Rl is manifold zero-crossing detector curr..
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The heart of this circuit is the LM3914 from national semiconductors. The LM3914 can sense voltage levels and can drive a display of 10 LEDs in dot mode or bar mode. The bar mode and dot mode can be externally set and more than one ICs can be cascaded....
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As the name indicates, the step switch selector circuit is intended to choose one of up to four analogue switches, which it does with the aid of some less....
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This is the first draft of the pH to 1-Wire converter schematic, and some of the component values are still missing. The original circuit runs on 12 VDC, but since the A/D converter IC must be supplied with 5 VDC only I want to scale down the circuit, so....
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Here is a very simple and useful project / schematic of a 12V to 3V converter circuit. The output current of the circuit is around 1A....
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This simple charger uses a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor. The base - emitter voltage of the transistor and the forward voltage drop across the....
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The simplest solution for implementing joystick control for a robot would be to program the actions in software in a microcontroller. But, since many readers prefer off-the-shelf parts, this circuit is going to be made with diodes, resistors, transistors,....
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The 555 timer is an extremely versatile integrated circuit which can be used to build lots of different circuits. You can use the 555 effectively without understanding the function of each pin in detail....
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Analog-to-digital converters (ADCs) represent the link between analog and digital worlds in receivers, test equipment and other electronic devices. As outlined in Part 1 of this article series, a number of key dynamic parameters provide an accurate....
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The high performance of modern set-top DBS TV tuners require broadband voltage control oscillator (VCO) designs at a competitive cost. To realize these goals, design engineers are challenged to create high performance, low-cost VCOs. The traditional design....
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This Keypad is suitable for the Modular Burglar Alarm. However, it has other applications. Pressing a single key will energize the relay. Entering the Four-Digit code of your choice will de-energize it....
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This is probably one of the most legendary fuzz pedals that has ever existed, and for good reason too! This thing can produce some completely saturated fuzz that is capable of slipping into feedback easily if you crank it up loud enough. I just can't say....
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There are occasions when you want to view your video clips taken in your digital camera on your TV. You can do so by interfacing the camera video output to video input of your TV. But this times you cant connect directly as it needs some amplification before....
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As shown, the circuit including a four 2-input NAND gate and a CMOS CD4011 type 555, and thus the output of either a static or high-time period, the power consumption is minima..
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This amplifier was designed to provide a use for the otherwise useless TO3 power transistors that many hobbyists have in their junk pile. With good construction the module is capable of high quality performance and is rated to 300 watts into a 4 ohm load....
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A low-noise block downconverter (LNB) is a key element in a satellite receiver system and is responsible for converting the relatively high frequency of the received signal into the more convenient L-Band. But how do they work and what do they look like on....
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A very simple 5 volt switching power supply electronic circuit project can be designed using FAN302HL highly integrated PWM controller integrated circuit, that provides several features to enhance the performance of general flyback converters. The....
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The aim was to build a MC sensitive preamp that was quiet, used only tubes and had a certain something that made you want to listen. This thing is quiet and if built properly, hum free. I have to put my head very near the speaker to hear a slight trace of....
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The schematic shows these a regular light bulbs, so there is the chance that the bulbs are burned out. I don`t know at this point if the bulbcan be easily replaced. I did some more checking and it does look like the bulbs in the HVAC control can be replaced,....
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Below are three examples of controlling a relay from the PC`s parallel printer port (LPT1 or LPT2). Figure A shows a solid state relay controlled by one of the parallel port data lines (D0-D7) using a 300 ohm resistor and 5 volt power source. The solid state....
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The idea is to create a system that allows the residents to play a movement based game similar to laser tag. Using GPS and a digital compass we track their localized movements and position vector. That information is used when the player wants to fire` upon....
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This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily....
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An audio power amplifier circuit for 3 watts stereo amplifier using max 7910 IC is explained below....
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A solution to one aspect of Power over Ethernet (PoE) is presented here utilizing the ON Semiconductor NCP1031 series of monolithic, high-voltage switching regulators with internal MOSFET. The application note provides details for constructing an....
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Ensure 5/-5 dual supply for chip TL062 IC3. Gnd is common ps ground, let grounds radiate from ground plane in one side of PCB. R3-R8 is an attenuator that may need to be designed or modified. In output R23 is for protection from shorting of 5V supply, R23....
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Is equivalent to single-pole electromechanical latching relay with electrically isolated solenoid. Once turned on, circuit remains in conducting state even though line voltage is interrupted for long periods of time. Positive reset action requires that....
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It uses SHD series of electronic control equipment electronic modules. Fan control box KZH as HKD 1F electronic module...
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Circuit as shown below, when the three-phase circuit in any one phase, star point balance is broken, small relay J is energized, an external control contact action, immediately..
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The following circuit is an electronic approximation of the gold leaf electroscope`, except that this electrometer indicates polarity as well as electric field magnitude. It is incredibly sensitive! It will detect a television or an electrostatically charged....
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The idea behind this economical ?ashing LED indicator is very simple: it uses a very low frequency oscillator to drive two LEDs. As can be seen in the cir....
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Well this is a Very Accurate LC Meter based on PIC 16F628A. Having inspired from surprisingly accurate LC Meter. This is my attempt to build an accurate L/C meter. This design is little different from other designs found on the internet. The goal of my hard....
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Cool little FM transmitter. Suitable for study purposes, you can use the RF part of this transmitter easily for your projects. However, unless you know how to build a serial data link and connect this LPFM transmitter to a PC or a microcontroller, you won`t....
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A very simple battery charger circuit having reverse polarity indication is shown here. The circuit is based on IC L200. L200 is a five pin variable voltage voltage regulator IC. The charging circuit can be fed by the DC voltage from a bridge rectifier or....
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At this time a unsophisticated MOSFET amplifier or else power Amp which Output power is plus/minus 100 Watt/RMS with8 Ohms otherwise ohter plus/minus 160 Watts /RMS with 4 ohms. Regarding this circuit simplicity, The distortion is plus/minus 0. 1 %. In....
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The local oscillator is crystal-controlled and the i-f swing is hardly compressed. The deviation of the transmitted carrier frequency, because of modulation, must therefore be limited to prevent severe distortion of the demodulated audio signal. The....
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This is the first color, graphic LCD display I worked with. I made some assumptions when I first began working with it. From previously working with TTL logic in college, I assumed CS and RESET could just be tied high for simplicity. It wont work if you do....
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SW3 is the on/off switch. It also lets you choose between the output with the current limit and the one without. SW2 provides a selection of three different limits. You can increase or decrease this number if you wish. The limits are fixed by R4, R5 &....
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DC motor is shown in dynamic braking circuit. Braking, press the stop button SB2, the contactor KM1 missing, and released its movable contact connected off, electrical voltage ..