New Circuits Page 144
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The complete hardware schematic of the Night Light Saver V6. 0. The AC line was protected F1, a 1A fuse. Any short circuit caused by saver`s components will blow the fuse. R1 and C1 limit current to the +5V zener diode, D3. R2 discharges capacitor C1 when....
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The FM telephone circuit is built on a PC board that is so small it can easily be fitted inside the housing of a telephone making it an instant pseudo-speak earphone. This FM circuit connects in series with telephone line, steals power from it, and transmit....
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A common problem with small torches is the short life-span both of the batteries and the bulb. The average incandescent torch, for instance, consumes around 2 Watts. The LED Torch in Fig. 1 consumes just 24 mW, giving it more than 80 times longer service....
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Circuit diagrams for both a Bosch and a Delco-Remy Starter-Generator (yes, the circuits are different). Unfortunately, due to a computer crash, I lost both the diagrams and his E-mail address. However, I was able to recover the E-mail and the diagram in May....
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We have a coil wound over a non-conductive tube which is the coilgun`s barrel, of course. It has to be non conductive (plastic or something comparable) because otherwise the coil`s magnetic field would simply cancel out itself inside the tube. The projectile....
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On the bottom you will see a 74AC125 which is a Quad Buffer with Tri-State Outputs. I`ve seen quite a few buffers like this on programmers. but im not exactly sure what they do Im assuming whatever "CTL" is controls the "state" of the buffers. but what....
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This circuit is even simpler and employs a 6V feed from one of the stator connections on the vehicle`s alternator. This is connected to a 6V automotive relay (RLY1) which controls a Continuous Duty Solenoid (RLY2). This solenoid electrically connects or....
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The thought of going to 24 GHz was far from my mind back in the summer of 2002. We had just come back from the Central States VHF convention in Madison Wisconsin where I had done a bit of chatting about it, but nothing serious. With Jenna just being born, I....
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A power supply circuit to bring 24VAC down to 5VDC. I have an L7805CV, but rectified (a bridge) and smoothed (a 33 F electrolytic), the input is still $40V_{peak}$, which is more than the max input voltage the regulator can take. Looking at the regulator`s....
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Hello friends I have a problem in a PLL. I have used a loop filter as shown in this figure: But the output spectrum is as shown in this figure: What`s ....
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A PIC is a Programmable Integrated Circuit. It is the big black ractangle on our breadboard. The standard PIC used in the course was a 28-pin package, the Microchip PIC18F2455. For our project, however, we uses a more robust PIC with more advanced PWM (Pulse....
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It is a low frequency Wiew bridge sinusoidal oscillator for the audio range with very low distortion, useful to test a variety of audio equipments. The circuit has been fully tested and a PCB circuit board is available to easily mount all components. The....
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This is the easy build surround sound processor circuit using the digital delay process method. This audio processor isn`t applying any unique function ICs that tough to obtain parsonaly, and designed in only common purpose ICs. The kind of this Surround....
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A sample robot, using parts from VCRs and bought only the minimum necessary to make the simplest robot I could think of. At the time I was using the Nemesis microcontroller, produced by Kronos Robotics, however this was not a good choice for Romania, because....
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Because of energy crisis Load shedding may be a common problem in several countries. Sudden power fluctuations, surge and high voltage may spoil sophisticated household appliances like TV, VCR, VCP and music system. This circuit provides protection against....
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The following circuit shows about 550 to 1100 KHz AM Receiver Circuit. Features: used to adjust the sensitivity and selectivity of the circuit, ....
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The power supply is just a 7812 voltage regulator followed by an op-amp set to 6V to create a half way supply voltage for the audio op-amp stages. A 12V regulator seems to be too high for a battery fed application. These 4 outputs are all followed by a....
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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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As mentioned before, a reason to modulate a message signal is to match the communication`s channel frequency. The reason for this is that information to be send over the channel is often at a rather low frequency. For example, the sound of music range in....
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The counter makes use of 5 cascaded CD40110 which combine a decade counter, a display latch and a 7 segment LED driver in a single chip. (The decimal points are driven by IC8x. ) The counter allows up and down counting (although only up counting is used in....
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The inductive electronic doorbell circuit is composed of the inductive electronic switch and music generator circuit, and it is shown in Figure 3-115. Inductive electronic switch circuit is composed of the inductive electrode A, transistor Vl-V4 and the....
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This is a radio transmitter circuit diagram suitable for fitting on radio collars using NE 555 IC. he circuit transmits a pulse in the FM between band 88MHz to 105Mhz....
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Capacitor Discharge firing boxes are well suited to certain types of electric match ignition and ill suited for others. Experimenting with this technology can be fun and educational, but the cost of a commercial CD firing box can be prohibitive. CD circuits....
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One of my backup systems uses a Magnum MS-PAE 4024 inverter, which doesn`t have any built-in fan controller. Since batteries give off hydrogen during both normal and equalization charging, it`s important to vent the batteries to the outside with a brushless....
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To generate 50% active factor (duty cycle) using 555 IC, we can use two diodes to separate the charging and the discharging path. With no diodes, we can also....
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Power supply with driver TEA1507 is mostly used by TV branded PHILIPS. Power Supply has an efficiency rate of up to 90% - thus requiring less cooling, as well as stand-by power required is less than 1 watt. Power Supply with TEA driver is equipped with a....
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Many enthusiasts will be using their PCs as data loggers, controllers or as web servers. ln these cases it is important that the machine is kept powered up for as great a fraction of the time as possible, even if there has been a power cut or if the power....
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This device has 24 milliwatts quiescent power drain when operating from 6 V supply in which making the LM386 ideal for battery operation. It is stated in the application hints section ofLM386 datasheet, there are two pins (1 and 8 ) provided for gain control....
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This voltage controlled frequency divider circuit (see figure in text) produces pulses of lower frequency that depends on the control voltage, and front edges of input and output pulses are synchronous. Actually, in this type of frequency dividers are used a....
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Taking the wiring going to the external amp, in the 15 pin connector you will want pins 8 and 9. I believe they are brown/white and dark green/white looking at the thread in the link you posted. Circuits 367 and 368. Then I clipped and stripped the....
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Wireless stepper motor speed control project using laser and IC555. Read to know about basics and circuit construction using a wireless stepper motor which has speed control through laser and IC 555 ..
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The following circuit shows about AD8531 IC For LCD Panel Backlight Automatic Control Circuit. Features: can compensate for aging effects and the ...
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The following circuit shows about LED Knight Rider Circuit Diagram. This circuit based on the 4017 and 555 IC. Features: Knight Rider circuit, 4 ....
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Because the recent events in Fukushima, Japan, brought a lot of concern on radiation levels, by popular demand, here is a simple Geiger Muller counter using the Russian tube SI-22G and a single transistor regulated inverter that puts out 400V, as required.....
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This is a very excellent 40W power amplifier design using TDA2030 IC and two transistors. The circuit employs only few components and does not require a dual power supply. The input signal is coupled to the non inverting input of TDA2030 through the DC....
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The Boarduino`s small footprint made me want to see how small of a device I could whip up in an hour from some fairly complex components. So I decided to see how small the combination of a Boarduino, a Wii Nunchuck, and a hobby servo motor could be. Here`s a....
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The Atmel AVR series are very good microcontrollers with quite a rich instruction set, rich enough that lots of folks have good compilers for them so we don`t have to learn their assembler. A very rich compiler available is the BASCOM/AVR compiler from MCS....
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File exchange, MATLAB Answers, newsgroup access, Links, and Blogs for the MATLAB & Simulink user community....
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This is the simple digital counter circuit, the IC application number 4029 from binary data, and then sent to the IC number 4513, a driver IC 7 Segment, to show...
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This inverter will drive any fluorescent lamp between 8w and 20w but works best with 16w tubes. It preheats the electrodes and keeps them heated while....
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Nothing in this project is real original, but I did do a couple of modifications from the circuits I saw. The fellow that started this, as far as I can tell is Jack Bryant, KE4ID with his one tube superhet contest radio project. That was my basis for this....
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A calculating resonance capacity from formula (1) and NFC Tag LSI are set to antenna circuit board, and measured resonance frequency, after that, adjusting resonance capacity..
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RCA made some of the first commercially available CCD chips. A CCD (Charge Couple Device) is a silicon solid state imaging device that replaces the vidicon tubes of the past. CCD`s are made up a two dimensional array of photo detectors coupled to an array of....
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A pre-requisite for this article is that you have the GCC AVR programming environment installed as described in my "Programming the AVR microcontroller with GCC, libc 1. 0. 4" article. If you want to avoid troubles with the installation you can of course use....
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Schematic and operation of a microcontroller-based driver circuit for large 1-Wire networks; includes software flowcharts and scope traces....
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Distance markers and iff signals are inserted at separate grids on one tube, while radar video from input 3 is impressed on control grid of other pentode. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. l, Electron Tube....
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In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in....
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MPEG-4 modules realizing real time compression & expansion plus network transmission of video data. The portfolio also includes small camera boards with image correction function...
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Amplifier circuit is very suitable to be used or applied in a narrow space such as in cars and so forth. Voltage amplifier is needed starting from 9 Volts to 17 Volts maximum. This amplifier circuit uses IC MPC575C, andsimilarities NEC575. Power output is....
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Nowadays, it is no longer necessary to use discrete components to build oscillators. Instead, many manufacturers provide ready-made voltage-controlled osci...
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When the 36 kHz infrared light from the LEDs is reflected by an object, one of the receiver modules will be triggered, and the PIC16F84 µController will steer the ROBOT away from the objects by reversing one of the motors...
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The type C system was first installed about 1925 and has been very extensively used. It incorporates the most desirable features of the systems just considered. Like the type A system, the carrier is suppressed, and hence the effect of line attenuation is....
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With the inspiration from lab 3, Digital Waveform Synthesis, I want to make a project that can process and playback music. Some songs are pre-stored in memory. They can be played back just like a real piano keyboard. Also the user can input a song on a....
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A very simple intercom circuit designed based on transistors. No need for a changeover switch and you can use it just like a telephone....
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The multi-purpose signal generator circuit is composed of the integrated circuit oscillators and the frequency dividers, it produces the square wave from the high frequency to the sub-audio frequency, and it also produces the frequency standard VHF. The....
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As the title implies, the present circuit is intended to convert sinusoidal input signals to TTL output signals. It can handle inputs of more than 100 mV....
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It`s a classic designing of final amplifier 35 W, with two EL34 in push-pull, from the Siemens and Halske, with year of designing 24/3/1953 and code SV410/1. The amplifier it worked from 1954 until 1989, whenever it came also out except operation, with mean....
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This hardware is used to display the number of cars in the parking lot. Basically, this board has six-segment display but using only one display can do our work. It used segment driver IC SN7447AN and 3*8 decoder to select the corresponding display. This....
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This LED Flasher circuit is based on the 555 timer IC. The LED Flasher circuit diagram is very simple and require few external components. When the circuit is working the red LEDs will flash at a set frequency one by one like at the railway crossing indicator...
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Here`s a really simple and inexpensive ($1) LED driver circuit. The circuit is a constant current source, which means that it keeps the LED brightne....
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Normally, Thereminworks by detecting hand proximity using capacitive coupling method. A Theremin circuit shown in the schematic diagram below use different method to control the pitch. The oscillator of this tone generator, both the volume and frequency are....
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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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Audio Power Amplifier is an important part in the reproduction of sound in a sound system. Audio Power Amplifier LM 3886 with power IC Audio Power Amplifier is a highly capable and able to produce 68 Watts with power rata2 4Ohm load and capable of producing....
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This was used on a Linear actuator for a variable geometry turbine used for more power to compensate for all the armor they started putting on HumVees. I forget the current rating, where ARE my old design notebooks ! The four darlingtons are the driver....
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the decision of designing a 9V powered Headphone Amplifier was finally taken. The main requirement was to power the circuit by means of a common, PP3 (transistor radio) alkaline battery. The appearance of the 5534 low-noise op-amp at a reasonable price was....
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To build a GaAs FET preamp that has good gain and extremely low noise from readily available components. This preamp is stable with differing source and load situations. The circuit is built dead bug style on a piece of printed circuit board for a good....
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This single white-LED torch can be housed in an empty glue-stick tube and has a long rechargeable-battery life....
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I have an Onkyo TX2500 mk II receiver that I`m hoping to fix up for a friend, which is not working properly on AM or FM. Tuning to AM gives low....
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The function for automatically control the speed of your fan according to the temperature. Component: BT136 Triac, Capacitor, Resistor, Relay, Fan Motor, ....
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U1a operates as a low-noise microphone preamp. Its gain is only about 3. 9 because the high output impedance of the drain of the FET inside the electret microphone causes U1aG ™s effective input resistor to be about 12. 2K. C2 has a fairly high value in....
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It is all very well knowing how to program the PIC in theory, but the real learning comes when you try your code on a PIC and see the results yourself in a circuit. You could build a circuit each time and program the PIC to see if the program works, or you....
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This TDA2030 35 watt audio amplifier circuit project is designed to provide an output power of 35 watts on to a 8 ohms load. The TDA2030 is a monolithic IC in Pentawatt package intended for use as low frequency class AB amplifier. The TDA2030 provides high....
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This dc voltage doubler circuit produces a voltage that is twice its voltage supply. This is useful when a higher voltage level is needed out of a single lower voltage power supply. Since the current consumption levels are low in such cases....
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This transimpedance amplifier employs a current-reuse stage and cascade differential stage to achieve a continuous gain tuning range of 15 dB and low noise figure of 1.061 dB at 2.4 GHz....
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555 low power timing circuit diagram The diagram is from the tech information of chinaicmart. IF for more detailed infomation of the circuit diagram....
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The CoolRunner-ii board has external 5v Relay interfacing, indicated as in Figure. ULN2803 is used as a driver for CPLD I/O lines, drivers output connected to relay modules. PTB connector provided for external power supply if needed...
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A phase shift oscillator, using a CE Amplifier. I have a Vc of approximately 6V, gain of approximately 40(>29, as required). I aim for an oscillation frequency of 1. 5 kHz...
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The two T-notch filter can be used to block unwanted frequencies or if placed in an op amp as a bandpass filter. the notch frequency occurs where the capa....
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A simplified block diagram of the MiniLOGGER is shown in Figure 1. The CMOS analog multiplexer, 4051 provides the output for 8-channel single-end input to an analog-to-digital converter chip, CA3162. The CA3162 is connected in free running mode. The digital....
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The ADEV Development System consists of the ATAR Target Module and the ADEV Test/Programming Module. The ATAR Target Module and the ADEV Test/Programming Module, together with development tools from Silicon Laboraties, Inc. (SL), can be used to develop....
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Designing and building a breadboard power supply for myself, which draws power from an ATX-like SMPS (Mains in, single Molex plug out) via a 4-pin Molex connector. The design includes a switch to select either 12V or 5V output, but the only appropriate....
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This circuit made from an infrared phototransistor and infrared LED. This transducer works with the principle of light reflection, in this case the light is infrared. The skin is used as a reflective surface for infrared light. The density of blood in the....
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