Popular Circuits Page 38
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This is a relay circuit that detect the presence of sound to activate the relay. You can use this sound-controlled relay as voice operated switch, light...
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Terminals 1 and 8 represent the gain control of the amplifier. These are the terminals where you can adjust the gain by placing a resistor and capacitor or just capacitor between these terminals. In this circuit, we will place a 10G‚ µF capacitor between....
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This pyrometer is used to measure an incandescent body. The principle for this measurement is that the hotter the body, the spectrum of the radiation will....
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Adjusting Ro or RP, you can change over the current setpoint. Circuit shown in Figure 14-98. Overcurrent, V conduction thyristor, transistor VTi, VT2 off immediately cut off th..
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The PhytoBot is a semi-intelligent plant which responds to external stimulus (light intensity and light location) and responds to it as a phototropic plant would. Essentially it is designed as a piece of interactive artwork for operation over a long period....
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This is the another UHF-TV pre-amplifier circuit diagram which simpler than the previous UHF TV preamplifier. This circuit is based MPSH10. Alternatives that could be put to use to replace MPSH10 are BF180 and BCY90. The tuned circuit comprising the 15nH....
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The H-Bridge is a circuit which can drive a motor in forward and reverse. It can be a very simple circuit that requires only a handful of components....
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Build an h-bridge just to reverse the current, I am controlling speed elsewhere. Can I simply wire up 2 N-Channel MOSFETs and 2 P-Channel MOSFETs into a IO pin from the MC (with resistors of course) or is it more complicated than that...
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We will describe the function of a digital stopwatch, 0 G 99 sec. The function of the stopwatch, relies in the use of 4 integrated circuits, which in this case belong to National Semiconductor ( It is obvious that other integrated circuits can be used to....
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As suggested before, it is beneficial to be able to adjust the gain of the amplifier circuit without having to change more than one resistor value, as is necessary with the previous design of differential amplifier. The so-called instrumentation builds on....
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This is one of the smallest and neatest FM transmitters to be presented as a construction project and it has the advantage of being available as a complete kit of parts. This will save going to a number of suppliers as no single supplier has all the....
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Circuit shown in Figure 16-105. Figure, MS synchronous motor. BQ its field winding; G AC excitation hair motors, BQG its field winding {empty box as part of the de-excitation. ..
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Cost-effective nickel-cadmium battery charger LM393 constructed as shown, it has the following characteristics: (1) constant current charging interspersed with large current di..
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The cost-effective design in Figure 1 provides control for CMOS switches without the need for an external power supply. Analog switches such as those in the MAX4663 are ideal for use in low-distortion applications. They are preferable to electromechanical....
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The VFC (voltage-to-frequency-converter) circuit in Figure 1 achieves a wider dynamic range and a higher full-scale output frequency100 MHz with 10% overrange to 110 MHzby a factor of 10 over any commercially available converter...
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The generator embodies an integrator as a ramp generator and a threshold detector with hysterisis as a reset circuit. The integrator has been described in a previous section and requires no further explanation. The threshold detector is similar to a Schmitt....
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Most of people ask TV transmitters. So Today I`m going to give you a very useful circuit diagram. By using this circuit you can send your signals 75m to 100m. This circuit diagram is not my own circuit one of my friends gave me this. I suppose you guys also....
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The heart of this DIY metal detector circuit is CS209A. The metal detector is build with one 100 µH coil. CS209A has one oscillator which forms a LC circuit, the inductance of the coil will change when it is near metal objects. LED 1 will light and the....
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A laptop computer supply that has 9-V output, crowbar overvoltage protection, and operates i`rom a 12-V supply is shown above. The supply voltage should be at least 3.6 V above the expected output voltage. Ql should be heatsinked appropriately. R5 should....
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The following circuit shows about Stepper Motor Controller Circuit Diagram. This circuit based on the 7404 IC. Features: simple stepper motor ...
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It is often required to switch electrical appliances from a distance without being a direct line of sight between the transmitter and receiver. As you may....
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The author described assembling this circuit on a 1"*1" perf board, I actually laid out a small PC board with excellent results. In this era of surface mount components, I think a much smaller version can be laid out on a PC board, allowing this circuit to....
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This circuit is intended to control a heating system or central heating plan, keeping constant indoor temperature in spite of wide range changes in the outdoor one. Two sensors are needed: one placed outdoors, in order to sense the external temperature; the....
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As shown constituting the photoelectric conversion by the photoelectric sensors and switches 555, etc., issued by a music song to prompt IC2. Illuminance sensor parts are made ..
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Sometimes you have a situation where you have a 5-V supply voltage but part of the circuit needs a lower supply voltage. A voltage regulator from the Texas Instruments TPS62000 family [1] is a good choice for this if the current consumption is less than 600....
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This oscillator is called the Colpitts oscillator and voltage controlled to achieve the FM (frequency modulation) and PLL control. T1 must be HF transistors to work well, but in this case I use a cheap and common BC817 transistor. LC tank oscillator needs to....
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This circuit automatically turns a motor cycle`s headlight on and off, independently of both the light and ignition switches, provided the battery is fully charged. The first stage uses the 22O resistor and ZD1 to hold transistor Q1 off while the motor is....
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These Intersil RS-485/RS-422 devices are "fractional" unit load (UL), BiCMOS, 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, this Intersil family is specified for 10%....
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Self-excited transistor inverter circuit. These types of inverters better performance, but also relatively simple diagram 2-122, available for 8 ~ 40W fluorescent lamps. When the power supply voltage is within 20% of the soil changes, which can operate stably...
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A video and the circuit with schematics for connecting and controlling the world`s smallest linear actuator based on a bipolar stepper motor from a Bluray drive...
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This page describes a battery tester I designed. It will characterize your batteries and save the results on an microSD card....
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The circuit was designed to produce an indication before a 12 V lead acid battery would reach the discharged state LM723 a positive NPN standard voltage....
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The vehicle acts in any way at this point electronically - for example, by its metal (change frequency of an oscillator) or by its components (eg RFID) Depending on the method used different grades of security and error tolerance can be acheived. Even....
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As shown for the bridge circuit excitation voltage XTR108. Circuit for the bridge excitation voltage is linearized adjusted, linearized algorithms that RTD linearization same r..
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A Simple design based on a 555 to Drive a Car Ignition Coil. I Designed this for a Small Electric Fence to Protect my Vegitable Garden from some Small Animal called a Marmots. Last year they ate one of my crops entirely before I could install this device. A....
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Add some resistors in parallel connection for more audio input. To adjust the volume for each input channel, add linear trimmer or potentiometer with configuration: pin1> ground; pin2>output; pin 3>input..
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On this page three adjustable notch filters configurations are shown . They can be used in your small pre-amp or amplifier project to filter out any HUM at 50 Hz ( European ) or 60Hz . By sustituting the capacitors values in the bridge other frequencies can....
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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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This circuit charges two NiCad cells with a constant current and features dual charging rates, voltage cutoff and an audible alarm. The circuit is powered by a 12VAC centre-tapped mains transformer, together with two rectifier diodes (D1 & D2) and a 1000mF....
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Circuit is shown. It includes the TC620 temperature control circuit, the temperature indicator circuit, thyristor controlled heating circuit, vocal music buck rectifier circuit..
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The clock circuit above uses seven ICs and 19 LEDs to indicate binary coded decimal time. The LEDs can be arranged (as shown in example above) so that each horizontal group of 3 or 4 LEDs represents a decimal digit between 0 and 9 and each individual LED....
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Examples of RF and audio ANL circuits. Positive and negative clipping occurs in both circuits. The circuit at A i..
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Has any one tried colliding two High Voltage potentials in a Grey Tube? Wiring two (identical)....
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Two hybrids (Tl and T2) are used to allow direct connection to a telephone line. This circuit uses the common speech-inversion algorithm where the frequency of an audio signal is inverted about a center frequency. ..
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Voltage-to-frequency converter (VFC) circuit is shown in the schematic diagram below. The circuit employs 555 IC as the core of its function. This circuit....
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The most important criteria of a data-acquisition system for college science laboratories are simplicity and price rather than precision or speed. The data-acquisition system in Figure 1 offers adequate precision of less than 0.5% and speed of 1 Hz to....
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This toggle circuit operates by using a couple 555 timers wired as inverters. Pins 2 and 6 are the threshold and trigger inputs to the first timer and pin 5 is the output. The output at pin 5 will always be the inverse of the input at pins 2 and 6. Likewise,....
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This alarm can be very useful in a room or an area that should normally have no movement at all in it. In a totally still room with no movement, no vibration will be detected and the alarm will not go off. Once the circuit detects a vibration, which could....
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ICl is connected in the astable mode, driving RLA, C3, Dl, and D2 prevent spikes from the relay coil and the wiper motor from triggering ICl. VR2 is adjusted to give the minimum delay time required. VR1 is the main delay control and pro vides a range of from....
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This electronic game pits a human player against the ˜machine. The opponents use a common ˜game token and take turns moving along a path by one, two or three steps, and the winner is the first one to reach the goal exactly. Incredibly enough, this simple....
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The amplifier of circuit, use negative current feedback. So, the load current depends mainly from the input signal and no so much from the impedance of loudspeaker. The inductor current of loudspeaker develop above in the R7 a voltage. This voltage is drive....
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The circuit in Figure 1 adds a soft muting switch with power-up/power-down muting to a line-level audio circuit. R4, C1, and JFET Q1 quietly ground a signal in 100 to 200 msec when you close S1 or release it when you open S1. Potentiometer R2, set to twice....
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Maxim now has available a series of five integrated oscillator building blocks in the MAX260x series which cover the frequency range between 45 and 650 MHz. The MAX2606 covers the VHF band, although the frequency can only be varied by approximately ±3 MHz....
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As water heaters, microwave ovens and other heating equipment temperature control circuit; Figure 16- 53 (b) as air conditioners, refrigerators, fans and automatic fire extingu..
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Modems are devices that connect either remote devices to a computer, or two or more computers to each other. Their connection is usually wired. The GSM modem we present is wireless. It can connect two computers, a computer with the internet or even be the....
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Camera operation failed on Nokia 2630 has similar solution with the Nokia 2600c because they have the same board. The problem usually caused by the hardware damaged or broken line on the circuit. Here we have some pictures related to Nokia 2630 camera....
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For a fixed frequency transmitter one commonly used method is to use a resonant quartz crystal in a Crystal oscillator to fix the frequency. For transmitter where the frequency has to be able to be varied then several options can be used. It is often the....
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Homebuild Basic Plotter / Engraver / Vinyl-cutter / PCB-driller a basic program reads a HPGL file and controls stepper motors connected to parallel port....
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Current mode amplifier has the benefit of higher frequency operation, and LM359 comes as operational amplifier with this type op amplifier. Current mode....
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From all the existing tubes, for sure the most interesting ones are the indicator tubes. From the 1930 ²s when they were invented, they captivated the eyes with the greenish shimmering light, thus the Magic Eye term appeared. The magic eye tubes are just....
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If you live in the frozen north, knowing your engine-block heater is working is a comfort. This device will let you know if yours is okay. Plug in PL1 to your power outlet. NE1 should light. Then, plug in the block heater. Depressing SI should cause the....
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Fiber Optic applications require analog drivers and receivers operating in the megahertz region. This complete analog transmission system is suitable for optical communication applications up to 3 MHz. The transmitter LED is normally biased at 50 mA....
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MP3 players are all the rage these days. The smaller ones in memory-stick format are particularly easy to take with you; your very own personal sound system` on the move! It`s when you want others to share your taste in music that you ¬nd these players to....
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Hello, I have queastion about type of the osclator I found on wikipedia here: File:NPN Colpitts oscillator collector coil.png - Wikipedia, the free....
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Conversion speed of this design is the sum of the delay through the comparator and the decoding gates. Reference voltages for each bit are developed from a precision resistor ladder network. Values of R and 2R are chosen so that the threshold is 1/z of the....
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[caption id=attachment_45 align=alignnone width=500 caption=Serial RS232 to USB][/caption] This is simple RS232 Serial to USB Converter that...
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A car battery deteriorates in use and its life seldom exceeds four years. When new, its voltage may drop to only 2V while cranking the engine. As the battery ages, its internal impedance increases and so the voltage drop while cranking also increases, until....
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Most cases of infra-red remote control failure can be detected by detecting the absence of the pulsed transmitted infra red light. It`s very rare that the....
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Pulse motor or stepper motor step motors, foreign, or commonly known as Step motor Stepping motor, Stepper, and so on. To the conventional stepper motor, the stepper motor can be simply defined as, according to the input pulse signal, each time changing the....
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The heart of the circuit consists of the Arduino microprocessor which is indicated by the header pins on the left of the circuit schematic shown on the right (click to open in new window). Two of the analog inputs (0 and 1) are connected to the emitter sides....
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The oscillator delivers an output of high spectral purity without any substantial sacrifice of the usual stability of a crystal oscillator. The crystal in addition to determining the oscillator's frequency, is used also as a low-pass filter for the unwanted....
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Here's something that has always bugged me: light waves are about 5000 Angstroms in wavelength, while atoms are more like 1 Angstrom across. Atoms are thousands of times smaller than light waves, yet atoms obviously interact very strongly with light. How can....
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We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon. ..
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Consumer appliances these days hardly ever have a proper mains switch. Instead, appliances are turned on and off at the touch of a button on the remote control, just like any other function. This circuit shows how a device (as long as it does not draw too....
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This circuit uses a single chip, IC BA3812L for realizing a 5 band graphic equalizer for use in hi-fi audio systems.The BA3812L is a five-point graphic equalizer that has all the required functions integrated onto one IC. The IC is comprised of the five tone....
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Application Note 381 contains information necessary to interface the Motorola MPC8260 processor to the DS2155 T1/E1/J1 Single Chip Transceiver (SCT). The application note covers interfacing both the address and data processor bus and the communications....
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P1 act as condenser microphone volume level. For FM, coil will be small. Use thin gauge enamel magnet wire. the diameter of coil will be a couple mm: use ink tube from pen to form, and try 8-12 turns. Small inductance coils make for much guess work. Tags: 1.....
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Electrical schematics diagram shown below is a simple two transistor tone controller audio circuit free pictures for download. This electric circuit is based on the well-known Baxandal tone control plan. Deviation in the value of these electrical circuit....
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The TPS6420x controller is designed to operate from one to three series-connected cells or from a 3.3 V or 5 V supply obtained from a USB port. At its output it can produce 3.3 V at 2 A, suitable for powering a microcontroller-based system. With a suitable....
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Looking at different ways to do current sensing, using regular opamps, rather than dedicated chips like the MAX4073T/F/H, which work well, they are just rather expensive. So while poking around i found an article written by Bob Pease, , which talks about....
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The winding machine electronic counter described in the example uses LED digital display to show the wound coil turns, the use of maximum count rate is 9900 turns. The working principle The winding machine circuit is composed of the power circuit, infrared....
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This circuit can be used to escape from the nuisance of mobile phone rings when you are at home. This circuit will give a visual indication if placed near a mobile phone even if the ringer is deactivated. When a call is coming to the mobile phone, the....
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servo mechanism. A feedback system that consists of a sensing element, amplifier, and servomotor, used in the automatic control....
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A rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions. When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched off to avoid irritating reflections. For this purpose,....