New Circuits Page 69
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If they have to be both powered from the battery do I need to connect the emitter to the ground of the Arduino AND the battery to stop all the current from flowing through the Arduino ground and get a clean pulse or do I just connect the emitter to the....
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Activated this and advisedly destroyed several 2N3055`s by shorting the emitters to ground. In all cases the transistors opened up and no beneficiary to emitter abbreviate occurred in any transistor. In any event, the alternative ambit in Figure 2 will....
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An error amplifier is formed from Tr1 and Tr2, wired as a differential amplifier (often called a long-tailed pair - look at those collector leads). One input of this diff. amp is taken from the zener diode which provides a stable 4. 7 volts, the other diff.....
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Below it is a circuit of power amplifiers with power output of 450 watts mono, amplifiers are also frequently used in the amplifier a high-power amplifier, which used in an event, in the field and the placed closed. Because this amplifier suitable for the....
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Here is a very simple and useful project of a moisture level LED Meter circuit that can be used as a sensor or detector to measure humidity or moisture level in plants, soil, wood, wall, floor etc....
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Circuit This circuit was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this circuit monitors the output of the TV`s FM detector IC via a shielded lead. To initially calibrate the meter, adjust....
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This is a collection of various useful and interesting schematics. Some of these are also referenced by or included in other documents at this site. What isn`t here (this may not be everything): * Extremely important safety information. See the document: "....
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This can be. increased readily by fitting a resistor in parallel with Ra, until the output voltage is5. 0 V precisely Switches S1 and Sz are preferably SPDT types with a centre position, but three-way rotary switches should also do if in both cases the....
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The gate-source voltage needed to bias the transistor into the linear region can vary between 0. 25V and 8V, which leaves a good 7. 75V down to a hopeless 0. 4V for the transistor and load if used with a typical NiCad 8. 4V PP3 You`ll have to get more FETs....
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the....
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Most small internal-combustion engines commonly used in the model-building world use glow plugs for starting. Unfortunately, glow plugs have an operating voltage of 1. 5 V, while fuel pumps, starter motors, chargers and the like generally run on 12 V. This....
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Vasilis Stergiopoulos has built a RJ45 LAN cable tester. The circuit was originally designed to use a 555 and 4017 IC, but Vasilis has published the schematic and source code in assembly for using the Attiny2313 instead. The Attiny2313 produces successive....
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A USB powered device with multiple IC`s. From what I`ve read it`s standard practice to use a combination of multiple range capacitors for decoupling each individual IC, with the smallest being as close as possible and larger capacitors not too far away.....
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Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to i/o line. But we cannot connect, say 10 or....
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It uses body heat to locate and track its human master. At heart of this heat seeking capability is the Devantech TPA81 Thermal Sensor Array. The TPA81 consists of an array of eight detectors mounted horizontally. Each of the detectors is capable of....
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The Sentient City Survival Kit is a project of Creative Capital. It is sponsored by the New York State Council on the Arts (NYSCA) and the Office of the Vice President for Research at the University at Buffalo. Additional support provided by the Network....
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After some more time with the circuit, the variable pot certainly brings in more useful results than I expected. Had linked draw to pot position and LED brightness, but not to transistor on-time. It should be obvious and now is, after reading your p..
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The picutre 3-6 is thermistor temperature or frequency conversion circuit. Because thermistors resistance changes with the temperature in linear way, the change can be used in voltage controlled oscillator. In the circuit, A1-A4 uses current type operational....
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As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull....
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5 WAY AC FLASHER We use these types of circuits in most ceremonies (wesak festival, christmas, wedding, ). This 5 WAY AC FLASHER circuit....
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This is basically 4 nearly identical debounced switches. The 2 resistors and one capacity at the input of each Schmitt trigger are used for debouncing the switches. The output is then fed into a D-type flip-flop which uses feedback to change the state (LOW....
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This is one of the simplest circuit for a PC parallel port based DLA. The Circuit is mainly used to protect the port which is fabricated on the motherboard itself..
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Tools that created this is to produce noisy atmosphere. This circuit is quite simple, this circuit controlled by two 555 timer IC is assisted by other discrete component resistors and capacitors. The first 555 timer U2 will generate a tone which can be heard....
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The LME49830 EF125WT1 amplifier PCB module showcases National Semiconductor s LME ultra-high fidelity power amplifier input stage ICs (drivers). The LME49830 is a fully complementary bipolar 200V input stage IC with 56mA (typical) of output current that has....
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The Nizo S156 is a really excellent compact camera with a great range of features. This thing is so small you can slip it into a coat pocket, yet it will give truly superb results. Put it on a long boom, car bonnet or stick it on a helmet for the ultimate P.....
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Electronics Tutorial about Active Band Pass Filter including Band Pass Filter Frequency Response, its Resonant Frequency and Second Order Response....
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The ICL7107 is a 3 1/2 digit LED A/D convertor. It contains an internal voltage reference, high isolation analog switches, sequential control logic, and the display drivers....
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Preamplifier circuit provides the proper loading for phono cartridges reluctance. This provides about 25 dB at 1 kHz gain (2.2 mV to 100 mV input output), features of S N/N ratio better than -70 dB (referenced to 10 mV input at 1 kHz) and has a dynamic range....
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Currently using the PIC24FJ128GA010 and I am planning to use Input/Output port to connect my 4. 2 V LiPo battery and to check if the voltage value doesn`t go below 3. 7 V. You should avoid digital. You have two options, use an ADC or use an Analog....
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For the first version of my Open Source Framework for USB Generic HID devices based on the PIC18F and Windows I made a quick example of how to use the library using a USB interface for an LCD. Now that I`ve completed the second version of the library I....
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In a basic astable timer, configuration timing periods 11 and 12 are not controlled independently. The lack of control makes it difficult to maintain a constant period, T, if either 11 or 12 is varied. In this circuit, charge RAB and discharge R8 c....
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This is the Snap Circuits Motor Control IC, or H-bridge. At the top of the figure you can see the electronic schematic of the Motor Control block. On....
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The system of using this circuit is positioning a little magnet close to the stalk switch SW1 while being connected to the hand or garments of the individual holding the sack with the use of a tiny cable. Since the circuit is tiny, it can be put in a tiny....
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LED Blown AC Fuse Indicator Circuit Diagram This circuit monitors a AC fuse. In this circuit, the LED indicator shows whether or not the fuse is....
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The ISL88731 is a highly integrated Lithium-ion battery charger controller, programmable over the SMBus system management bus (SMBus). The ISL88731 is intended to be used in a smart battery charger (SBC) within a smart battery system (SBS) that throttles the....
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This schematic diagram shows a ring-around LED flasher circuit. This circuit will turn off two LEDs and turn on the other two until the timing cycle reverses..
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After a lot of searching the web, I could not find a 16 step sequencer schematic that didn`t require an arduino or PIC or some other digital controller. Here is a simple 3 chip analog 16 step sequencer with variable speed and arpeggio I came up with, based....
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This audio power amplifier uses two complementary MOSFETs (IRF9520 and IRF520) to deliver up to 20W into 8 © speaker. A TL071 op amp is used as an input amplifier. The MOSFETs should be heatsinked with a heatsink of better than 50C/ W capability. THD is less....
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Ultra-low EMI, Mono and Stereo, Class D audio power amplifiers provide Class AB performance with Class D efficiency. Maxim`s spread spectrum modulation (SSM) along with 3rd generation EMI reduction techniques reduce EMI radiation by lowering the high....
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Article for an LED driver design for automotive rear lights. Shows how dimming is best achieved with PWM and an LED driver IC that eliminates the need for external PWM signal....
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It should be painfully obvious that the positioning of a coil by a millimeter one way or the other could decide success or failure. and when you`ve got 10s of millimeters as a possible position, the chances for INCORRECT positioning, and thus FAILURE, are....
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Can reduce the electric current ripple on the Filtering capacitance greatly while adopting this kind of structure, thus has reduced and filtered the size of inductive magnitude and whole DC-DC converter greatly. This kind of converter operates the....
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We have a Subaru Brumby which has been with us for some time. Our mechanic says that the engine is ....
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SW1 should be ganged to P1 to avoid abrupt voltage peaks on the "patient`s" body at switch-on, but a stand alone SPST switch works quite well, provided you remember to set P1 knob fully counter-clockwise at switch-on. Some commercial sets have four, six or....
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A discussion of the Williamson Amplifier should be first preceded by an overview of its context in the evolution of the vacuum tube and its application to high fidelity audio reproduction. Transformer coupling was widely used pre-war because it was simple....
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This circuit was requested by several correspondents. Its purpose was to obtain more power than the siren circuit already available on this website (One-IC two-tones Siren) and to avoid the use of ICs. A complementary transistor pair (Q2 & Q3) is wired as a....
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used to select modes of operation, the accelometer is used to generally move the snakearm while the hall effect sensors are designed to enable ....
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This is a buffer circuit for TMP01 Temperature Sensor. The output of this sensor is a low impedance dc output voltage with a 5 mV/K temperature coefficient....
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Most cards of sound in computer, are deprived stereo input for microphone, on the contrary have stereo input for high level [ Line ]. The circuit uses the input Line of card of sound, in order to we place a two mono stereo microphone, in the input of card of....
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It`s well known that many animals are particularly sensitive to high-frequency sounds that humans can`t hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz. My aim was, however, to....
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Sense the amount of ambient light and switch the lights on when it was dark out. I was successful in building one on a bread board that used an lm324 (its the only comparator radioshack had) some resistors a trimmer resistor and a photocell. So I went and....
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This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It has two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....
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Using the RF2126 high-power, linear amplifier IC manufactured by RFMD can be designed a very simple and high efficiency amplifier for 2. 45 GHz ISM applications such as WLAN and POS terminals. The part will also function as the final stage in digital PCS....
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Servo refers to an error sensing feedback control which is used to correct the performance of a system. Servo motor is a DC motor equipped with a servo mec....
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Here is another little circuit I designed for radiation logging purposes. It is based on an Atmel 168 Microcontroller and a small and precise RTC device called RV3029. I also used an AT45DB41 Dataflash for this Circuit, as I had the sourcecode for....
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This is a design circuit for digital voltmeter circuit. The integrated circuit ICL7107 is a 3-1/2 digit LED A/D convertor. It contains an internal voltage reference, high isolation analog switches, sequential control logic, and the display drivers. The....
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For phototransistors a value of 470K ohms will work for most room light situations. If the light is dim, selecting a higher value resistor such as 1 Megohm will give better sensitivity. This High Impedance Test Voltmeter circuit can also be used for testing....
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Using this continuity tester circuit, a failure of? PCB tracks be examined without looking directly at the tracks routing, which is can be very frustrating..
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The heatsink on the triac is a bit unclear for me. I`ve calculated a maximum value of 10C/W, is this fine My calculation is: (max temp - room temp)/(max on stage voltage * (milli amps / voltage) - junction to base themal resistance (110-25)/(1.....
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Here is the circuit diagram of a simple 24W mono amplifier using IC TDA1516. The TDA1516 is an integrated class B power amplifier in a 13 pin SIL package. The IC has many useful features such as short circuit protection, load dump protection, thermal....
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The impedance of these current generators is essentially infinite for small currents and they are accurate so long as VIN is much greater than VOS and IO is much greater than I bias. The source use an FET to drive a bipolar output transistor. It is possible....
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The schematic for this charger is pretty simple. GellCell Battery Charger: circuit to charge a Gell Cell or other lead-acid type. This simple battery level monitor circuit can indicate the charging process in 12 Volt Lead Acid battery or Tubular. 12V battery....
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This 24V to 36V linear battery charger is long overdue. While this is an old circuit technique, it is optimized for charging higher voltage lead-acid batte....
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This transmitter is very stable and will deliver up to seven watts of power with the components and tubes shown. Do not be put-off by valves as they are VERY easy to work with and it seems that there are quite a few valves around. Because no-one wants these....
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The schematic diagram described here is a TMP01 Celsius Scale Temperature Sensor circuit. This circuit is used to convert the VPTAT output voltage that is ...
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A simple seven/7 segment counter circuit with an LED display. This counter circuit diagram is designed using IC CD 4033 as counter,555 Timer IC and seven segment LED Display LT 543....
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A single-ended tube headphone amp using the TTVJ Millett 307A. I`ve been breadboarding various SE and PP power amp circuits with the 307A for a good year or more, but just haven`t had the time until now to come up with anything I like. As far as I can tell,....
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Stereo tube amplifier circuit which is built based 5 power tubes of 6SQ7-GT, 6V6-GT and 5Y3-GT. This circuit generates up to 4 watts audio output each channel..
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The objective is to make a small light that is activated by motion and will remain on for 20 seconds and then deactivate. i. e. you pick up the light it illuminates youput it back down and it remains on for 20 seconds then turns itself off. until it is....
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Using BA1404 can be designed a very simple and useful fm stereo modulator electronic project. This BA1404 fm stereo modulator device works in FM broadcast band ( 75- 108MHz) and require few external common components. The BA1404 fm stereo modulator Ic....
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The Motor30 board is an H-bridge for delivering up 30 Amperes of current to a motor. In addition, it has an on-board hall-effect shaft angle sensor. The module is fully opto-isolated to keep motor noise from leaking across to the logic power supply...
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The LTC1754 is a micropower charge pump DC/DC converter that produces a regulated output. The input voltage range is 2V to 4. 4V for 3. 3V output and 2. 7V to 5. 5V for 5V output. Extremely low operating current and a low external parts count (one flying....
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The following circuit shows about Infrared Proximity Sensor Circuit Diagram. This circuit based on the MAX4230 IC. Features: 10kHz oscillator ....
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This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of low power comparator LM1801 made by National Semiconductor. The reference voltage for the....
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This simple flashing light circuit is powered with 6 volts/0.5A and has a low current consumption when the light bulb is off. The flashing frequency is set....
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This AC drill speed controller circuit schematic allows to control the holing speed of your borer or driller machine. This project is based on the fact tha....
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This circuit can be used for lighting a single (prototype) railroad signal. You could use this to drive a model railroad signal, but only if it is for a static display - for this circuit is not designed to be interfaced with anything. DCC systems, computers,....
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This design synthesis has considered the survey accuracy of the frequency and measured the requirement of response time. For example it is 3 significant digits to look on the measuring result of the frequency as, require, at this moment if the frequency of....
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Using ceramic tuning 3. 587 mhz resonator and resonator filters are also sold with a value of 5. 5mhz, 7. 7 mhz and 10. 7 mhz. Distance transmitter range is approximately 2-4km. the working principle of this circuit are filter resonator/ceramic filtersraise....
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Downloading and CD-burning programs usually provide the option of automatically shutting down the PC on completion of their tasks. However, this energy-saving feature is of little benet if even after the PC has been switched off, all of the peripheral....