New Circuits Page 175
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Repeater or other unattended equipment can be turned on or off with ordinary telephone Phone at remote station is called and allowed to ring three times Caller then hangs up, waits 20 s, redials number and lets it ring three times again, then hangs up.....
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This scan is from my old ETI Circuits #2 from the 70 ²s. It`s about the best op-amp info you are likely to find. With a bit of knowledge, these six circuits are an instant ready-reckoner and allow you to do almost anything! If you want to learn then they are....
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I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no....
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In the circuit, the adjustable prestage is composed of transistor AF279, and the natural oscillation mixer stage consists of transistor AF280. The power circuit is installed on the board with copper coating. The main coil data:L1, L3, L8, L9: eight turns,....
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The modem off indicator is intended especially for serious Internet surfers. It will be seen that the circuit of the indicator cannot be much simpler, or there might be nothing left. In spite of its simplicity, it may prove to be a cost-saving device, since....
-
This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must....
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This is a control of servo motors in software programming using PIC 16C71 microcontroller. The input signals are between 0 - 5V delivered by ....
-
Kids these days seem to have most things you see in the toy shops, so if you have a son or grandson who has a collection of cars, here is something he wil....
-
At this point you whistle into the receiver and the Infinity Bug will pick up the line. The high-gain amplifier in the Infinity Bug will pick up the audio at the place where it is located. It can only be assembled on the PC board supplied in the kit as the....
-
An impressive little machine gun sound effect generator circuit is discussed here. Once built can be integrated with any audio amplifier to experience a roaring bullet studded war like simulation. A small hobby project which can be tried by all electronic....
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We all know pretty well about solar panels and their functions. The basic functions of these amazing devices is to convert solar energy or sun light into electricity. Basically a solar panel is made up discrete sections of individual photo voltaic cells.....
-
-
The XC6119 series is a highly precise, low power consumption voltage detector, manufactured using CMOS and laser trimming technologies. The device includes the built-in delay circuit. A release delay time CAN be set freely by connecting an external delay....
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The following circuit shows about 741 IC For Constant Temperature Control Circuit Diagram. Features: used to lower the drift of a Ramsey FM10a ...
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The following circuit shows about SciTech PS-3R Power Supply Circuit. Features: 13.8vDC, 5 Amps Surge, 3 Amps Constant. Component: Transistor, ....
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Diagram shows a timed light control switch circuit in Mexico, especially for outdoor advertising light boxes street lamps and power control, it is time saving switch circuit. Now with the door switch to manual control of lights and more, often forget to turn....
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If the load resistance RL is reduced or load terminals are shorted acciden tally, a very large load current will flow. It may destroy the pass transistor Q1, diode or possibly some other component. Fuse protection will not prove adequate because the....
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As per manufacturer s data sheets, a 12V rechargeable lead-acid battery should be operated within 10.1V and 13.8V. When the battery charges higher than 13 ..
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The simple indicator presented in this article may be combined, in principle, with any circuit that contains an LED bar display driven by a Type LM3914 IC. It ensures that an LED will light when all LEDs driven by the LM3914 are out. This prevents one....
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This is a simple, but very useful circuit that can be used to transmit telephone conversations. When the telephone receiver is on hook the voltage across the lines will be about 48 volts. The preset R7 is so adjusted to obtain a 24. 7 V across between the....
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An ultra sensitive gauss meter circuit/schematic anywhere that constitutes a simple indicator No measurement. No scaling. No accuracy. Just hall device/ic on a board with power supply inputs, a bit of signal conditioning of maybe a dozen more parts, and a....
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This is an AM demodulator which is not affected by phase errors in the demodulated signal. Phase error is a type of error commonly found in simple diode/low pass filter demodulators. At the input stage is an AC amplifier which is adjustable through P1. A1....
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I originally wanted to call it Chimera , but then I remembered there`s already a synth company using that name, so I went with Cerberus to avoid confusion, and because Tricephalic Filter just doesn`t have the same ring to it. I didn`t bother renaming the....
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A simple lab power supply electronic project can be designed using this circuit diagram which is based on the LM2576 monolithic integrated regulator that provide all the active functions for a step-down (buck) switching regulator. As you can see in the....
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The best way to get a sense for space-charge tubes is to study some real circuits. Look at the online circuits listed below, and see if you (or one of your friends) have any of the older print articles listed after the online articles. That done, choose a....
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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 circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz squarewave to the input. All graphs were produced using Tina Pro...
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The notion of "crystal radio" is strongly associated with huge antennas and radio broadcasting on long and medium bands, in this article, the author describes the experimentally tested detector circuits of VHF receivers designed to listening to a FM....
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R4 prevent the output voltage drifting towards one of the supply rails to the op amp I understand that R4 has to have a high resistance but I do not know why That looks like a Circuit Lab schematic! It would be great if you could post a link to the schematic....
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The main component of this circuit is an operational amplifier (such as the 741 or 351), configured as an amplifier whose feedback circuit is a diode bridge full-wave rectifier. An ammeter is attached to the rectifier circuit as shown in Figure 1 so that the....
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The circuit uses a dual operational amplifier IC, the 1458, which is a single IC package that houses two individual op-amps. In this circuit, the first op-amp is used as a voltage follower whose output is used to charge the capacitor C1 through D1. As such,....
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Short circuits in the tracks, points or wiring are almost inevitable when building or operating a model railway. Although transformers for model systems must be protected against short circuits by built-in bimetallic switches, the response time of such....
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I use a 12V 20W halogen lamp (MR16) and a 4. 2Ah SLA battery for my bike light system. The battery has only limited life at this power rating, so I designed this cheap light dimmer to reduce the battery drain and allow for longer rides at night. Based on a....
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4 Stage FM Transmitter This is the FM transmitter circuit which apply 4 radio frequency stages, that are a VHF osci Wholesale fmuser CZE CZH FM Transmitter,Fm Transmitter % FM Radio Transmitter for sale ?czhfmtransmitter,OEM ODM Low Power Fm Transmitter....
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A Simple Transistorized one Minute Delay Timer Circuit. It doesn`t include any complex or critical parts. You can use this circuit to generate a time delay of about one minute. That is, When you press the switch (Push button type is preferred) the LED turns....
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Reverse engineered circuit diagram of an expensive commercial variable lab power supply. This unit is designed around an ordinary op-amp and easy to obtain parts. Although the unit uses a single transformer with two output windings the circuit works equally....
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Zender diode to do the over-voltage protection, this issue might be solved. Am I right or I need to do another thing to protect it. Please give me any advice. A zener diode will help if over-voltage on VDDA if that is the cause of the failure, but with a 12V....
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Here is a schematic of a good quality AM radio receiver circuit. The heart of the circuit is MK484 AM radio IC. It is a high sensitivity and high quality IC, it has only three leads and comes in TO92 package and require only few external parts because all....
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The following circuit shows about 14 Watt Compact Fluorescent Electronic Ballast Circuit Diagram. Features: similar to a 16 Watt circuit, 14 Watt ....
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Solar PV Modules: UL Listed and installed world wide, these solar panels are reliable, with an excellent performance record in the field. You really don`t have to be a mechanic or be mechanically inclined to make your own solar module panels. Prices are....
-
-
Here is a schematic of a very sensitive microphone preamp circuit, which can be used to increase gain of microphone or boost the audio signals coming from microphone. The circuit is very simple contains only few components and can be assembled in few minutes....
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The hardware configuration when using multiple 1-Wire temperature sensors like the DS1820 is very simple, as illustrated in the block diagram below. A single-wire bus is used for communication between the microcontroller and the temperature sensor. It is....
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My daughter wanted a way of measuring static for her science project. While scanning through an old copy of Getting Started in Electronics by Forres....
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An audio tone control combines both a Base control and a treble control in the same circuit. Tone controls are found on lower-end audio gear because it saves both front panel space on the unit and only requires one control knob, instead of two separate....
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The solar orientation circuit uses a comparator with window control that maintains engine idle as long as the two LDR`s (photoresist) are subjected to the same illumination. In this case, half the voltage is applied to the noninverting input of A1 and A2`s....
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The ADM1066 is a configurable supervisory/sequencing device that offers a single-chip solution for supply monitoring and sequencing in multiple-supply systems. In addition to these functions, the ADM1066 integrates a 12-bit ADC and six 8-bit voltage output....
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The function of this automatic volume control circuit is to amplify signals without distorting its dynamic compression. The amplitude differences in the signal are levelled off and the disturbing effect vanish. With this tehnique, overcompensation in the....
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the circuit schematic diagram of Fan Speed Control which turns on only when needed. when your transistor getting hot, the fan will automatically ...
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This circuit mixes H synch. V synch. and actual video. T2 mixes the synch, while T1 serves as an emitter-follower. Bandwidths of up to 25 MHz are typical for this circuit. ..
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I don`t want to use carbon offsetting, eg planting trees that nominally soak up some agreed amount of carbon/CO2 (for a while), but rather I want to genuinely and measurably reduce consumption and/or (micro)generate some of the energy that I consume, causing....
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Bedini student, Rick Friedrich, presents his set-up and results, claiming that in the process of moving charge from one battery to another through the motor system, that this system can achieve a net energy gain, harvesting energy from the environment....
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Various architectures of receivers has been proposed in literature, but most popular architectures among them like Heterodyne, Homodyne, Wideband-IF and Low-IF are presented here. Heterodyne Arch....
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All LEDs require some form of current limiting. Connecting an LED directly to the power supply will burn it out in a heartbeat. Overdriving, even briefly, will significantly reduce it`s life and light output. Fortunately, driving a single or a string of low....
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A photodiode Dl feeds high gain IR remote control preamp 1C, a CA3237E. U2 is a PLL FM detector tuned to around 100 kHz. The detector output is amplified by U3 and it can drive a speaker or a set of headphones...
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The 1956 Regency ATC-1 converter heralded the dawn of a new era for amateur radio. The little converter had only two transistors - one PNP, one NPN, both germanium, both now long obsolete - but they were the start of a revolution. Amateurs responding to the....
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How to use a desktop computer to solve the complex arithmetic needed to design state-variable filters for audio use. Construction of a tunable notch filter for measuring harmonic distortion is featured. Audio Amateur Corp. did a beautiful job (as always)of....
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This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software....
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This unique property makes the ˜paraphase configuration of interest if only treble or bass needs to be adjusted - it is not possible to adjust both at the same time! Essentially, it s the difference in setting of the tone controls that determines the slope....
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Here is the circuit diagram of an FM remote encoder/decoder using the ICs RF600E and RF600D. These devices are designed to provide a high level of security and operates from anything between 2 to 6. 6V DC. Various electronic circuits like remote control....
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Figure 1 shows the 10. 58 to 10. 74 MHz VFO oscillator circuit. Yes, this is the same circuit that was presented last, but I`ve re-designed to show the Colpitts oscillator more clearly. "L" is approximately 1. 5 uh, 19 becomes a core T50-6 (yellow). The....
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This light alarm schematic circuit is designed using some common electronic parts, as you can see in the circuit diagram bellow. This light alarm schematic circuit project will sound as soon as the drawer is opened and light falls on the Darlington....
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To operate a microcontroller, you need some basic components to support it and the circuit we call it basic circuit. The components needed are very common and you can find them at any electronics store out there. Here, i will share the schematic of basic....
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This system is a control system based on one-chip computer, control the system light in remote-operated way. This scheme mainly solves transmission and receiving of the signal, the program manipulation to different signals after the the signal one is dealt....
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Simulation schematic for astable multivibrator Parameters Vcc=24 Vol=1 Voh=21 Power supply Vcc Vcc 0 {Vcc} Time constant R1 Vo Vc 1K C1 Vc 0 100n. IC V(Vc)=0 * *Reference R2 Vo Vr 100K R3 Vcc Vr 100K R4 Vr 0 100K * *Comparator E1 Vo 0 Vr Vc table=(-1m {Vol}....
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For mad scientists only ! Portable Jacobs Ladder circuit. A very unique project...
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The basic design of this project will use a Atmel AT89S8252-24PC Microcontroller, since this micro has 2KB of EEPROM that can be used to store data during runtime. A ADC0838CCN analog to digital will be used to receive up to 8 inputs from sensor devices,....
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A good thing too since I initially hooked the p-channel mosfets up backwards. No smoke fortunately. I`m using Pololu gear headmotors (although continuous rotation servos will also be supported). In order to drive the motors in either direction I`m using....
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A steady, flexible, convenient traffic light control system to have necessity and realizability. But a lot of traffic lights are switched over according to a time interval in actual life. And the traffic lights can be according to changing the switching time....
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If I disconnect the ground of the Arduino from the negative terminal of the power supply, current flows through the MOSFET, even when the switch isn`t closed!..
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If you ever wondered how those phone bugs from spy movies work, here is the schematic for your very own. This simple FM transmitter uses a phone line to both power the device and receive the audio signal. Just hook it up to the phone line you want to monitor....
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This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components...
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This is small inverter on 30 watts, It converts DC voltage from 12V battery to AC 220V-230V at 50Hz which is electricity same use in your house. It can provide 2-3 Air pump or other. You will like them because so cheap and easy to builds. Then, what is it....
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This simple tone control circuit is designed based on the famous Baxendall tone control circuitry. The circuit given here can give a maximum cut or boost of around 12 dB at 10 KHz (treble) and 50Hz (bass). Also, both bass and treble can be independently....
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The following circuit shows about Water Level Detector Circuit Diagram. This circuit based on the PIC12F683. Features:PIC Micro has the sleep ....
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How to interface a microcontroller to the phone line. The tones you hear as you enter numbers on your phone can remotely control devices. Learn how to use these DTMF tones in your microcontroller projects. This article was submitted by Mayank Magoo as part....
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The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for....
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My wife was working on a doctoral dissertation and needed to do some field work involving personal interviews in various settings. What would be the best way, technically speaking, to record the interviews To pass a tape recorder or microphone back and forth....
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Texas Instruments introduced TPS54618, 6-A step-down SWIFT DC/DC converter. The new TPS54618 monolithic synchronous switcher with two integrated 12-milliohm....
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A strobe light passes a brief, intense pulse of electric current through a gas, which then emits a brilliant burst of light. The gas is usually one of two inert gases, xenon or krypton, that emit relatively white light when they`re struck by the fast moving....
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These days many more audio-visual devices in the home are connected together. This is especially the case with the TV, which may be connected to a DVD pla....
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The TNT Convertus has been one of my favorite designs. It was probably one of the first DAC DIY projects published in Italy, and attracted a lot of attention (well, given the size of the market, obviously. ). A few changes have been made to the original....
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Dear friends i need your advice about the connection diagram of the MAX4685 analog switch attached. I have two inputs VI1 and VI2 and hence we have....
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This diagram will give you a simplistic idea of how it all works, as you can see the only time left and right come together from the indicator switch is from the stalk to the hazard switch, so get the steering column off too and go all the way from the....
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The audio bandpass filter described is useful for amplification and filtering weak AM TV video carriers. For example, a DFM (digital frequency audio multimeter) may have insufficient input sensitivity for measuring extremely weak SSB TV video audio signals.....
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The design of the charger is similar to that of many commercially available chargers. The charger consists of a mains adaptor, two resistors and a light-emitting diode (LED). In practical use, this kind of charger is perfectly all right. Resistor R1 serves....
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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 circuit diagram, the LEDs are connected in anti-parallel. At every change in level there will only be a....
Repeater or other unattended equipment can be turned on or off with ordinary telephone Phone at remote station is called and allowed to ring three times Caller then hangs up, waits 20 s, redials number and lets it ring three times again, then hangs up.....
This scan is from my old ETI Circuits #2 from the 70 ²s. It`s about the best op-amp info you are likely to find. With a bit of knowledge, these six circuits are an instant ready-reckoner and allow you to do almost anything! If you want to learn then they are....
I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no....
In the circuit, the adjustable prestage is composed of transistor AF279, and the natural oscillation mixer stage consists of transistor AF280. The power circuit is installed on the board with copper coating. The main coil data:L1, L3, L8, L9: eight turns,....
The modem off indicator is intended especially for serious Internet surfers. It will be seen that the circuit of the indicator cannot be much simpler, or there might be nothing left. In spite of its simplicity, it may prove to be a cost-saving device, since....
This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must....
This is a control of servo motors in software programming using PIC 16C71 microcontroller. The input signals are between 0 - 5V delivered by ....
Kids these days seem to have most things you see in the toy shops, so if you have a son or grandson who has a collection of cars, here is something he wil....
At this point you whistle into the receiver and the Infinity Bug will pick up the line. The high-gain amplifier in the Infinity Bug will pick up the audio at the place where it is located. It can only be assembled on the PC board supplied in the kit as the....
An impressive little machine gun sound effect generator circuit is discussed here. Once built can be integrated with any audio amplifier to experience a roaring bullet studded war like simulation. A small hobby project which can be tried by all electronic....
We all know pretty well about solar panels and their functions. The basic functions of these amazing devices is to convert solar energy or sun light into electricity. Basically a solar panel is made up discrete sections of individual photo voltaic cells.....
The XC6119 series is a highly precise, low power consumption voltage detector, manufactured using CMOS and laser trimming technologies. The device includes the built-in delay circuit. A release delay time CAN be set freely by connecting an external delay....
The following circuit shows about 741 IC For Constant Temperature Control Circuit Diagram. Features: used to lower the drift of a Ramsey FM10a ...
The following circuit shows about SciTech PS-3R Power Supply Circuit. Features: 13.8vDC, 5 Amps Surge, 3 Amps Constant. Component: Transistor, ....
Diagram shows a timed light control switch circuit in Mexico, especially for outdoor advertising light boxes street lamps and power control, it is time saving switch circuit. Now with the door switch to manual control of lights and more, often forget to turn....
If the load resistance RL is reduced or load terminals are shorted acciden tally, a very large load current will flow. It may destroy the pass transistor Q1, diode or possibly some other component. Fuse protection will not prove adequate because the....
As per manufacturer s data sheets, a 12V rechargeable lead-acid battery should be operated within 10.1V and 13.8V. When the battery charges higher than 13 ..
The simple indicator presented in this article may be combined, in principle, with any circuit that contains an LED bar display driven by a Type LM3914 IC. It ensures that an LED will light when all LEDs driven by the LM3914 are out. This prevents one....
This is a simple, but very useful circuit that can be used to transmit telephone conversations. When the telephone receiver is on hook the voltage across the lines will be about 48 volts. The preset R7 is so adjusted to obtain a 24. 7 V across between the....
An ultra sensitive gauss meter circuit/schematic anywhere that constitutes a simple indicator No measurement. No scaling. No accuracy. Just hall device/ic on a board with power supply inputs, a bit of signal conditioning of maybe a dozen more parts, and a....
This is an AM demodulator which is not affected by phase errors in the demodulated signal. Phase error is a type of error commonly found in simple diode/low pass filter demodulators. At the input stage is an AC amplifier which is adjustable through P1. A1....
I originally wanted to call it Chimera , but then I remembered there`s already a synth company using that name, so I went with Cerberus to avoid confusion, and because Tricephalic Filter just doesn`t have the same ring to it. I didn`t bother renaming the....
A simple lab power supply electronic project can be designed using this circuit diagram which is based on the LM2576 monolithic integrated regulator that provide all the active functions for a step-down (buck) switching regulator. As you can see in the....
The best way to get a sense for space-charge tubes is to study some real circuits. Look at the online circuits listed below, and see if you (or one of your friends) have any of the older print articles listed after the online articles. That done, choose a....
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....
This circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz squarewave to the input. All graphs were produced using Tina Pro...
The notion of "crystal radio" is strongly associated with huge antennas and radio broadcasting on long and medium bands, in this article, the author describes the experimentally tested detector circuits of VHF receivers designed to listening to a FM....
R4 prevent the output voltage drifting towards one of the supply rails to the op amp I understand that R4 has to have a high resistance but I do not know why That looks like a Circuit Lab schematic! It would be great if you could post a link to the schematic....
The main component of this circuit is an operational amplifier (such as the 741 or 351), configured as an amplifier whose feedback circuit is a diode bridge full-wave rectifier. An ammeter is attached to the rectifier circuit as shown in Figure 1 so that the....
The circuit uses a dual operational amplifier IC, the 1458, which is a single IC package that houses two individual op-amps. In this circuit, the first op-amp is used as a voltage follower whose output is used to charge the capacitor C1 through D1. As such,....
Short circuits in the tracks, points or wiring are almost inevitable when building or operating a model railway. Although transformers for model systems must be protected against short circuits by built-in bimetallic switches, the response time of such....
I use a 12V 20W halogen lamp (MR16) and a 4. 2Ah SLA battery for my bike light system. The battery has only limited life at this power rating, so I designed this cheap light dimmer to reduce the battery drain and allow for longer rides at night. Based on a....
4 Stage FM Transmitter This is the FM transmitter circuit which apply 4 radio frequency stages, that are a VHF osci Wholesale fmuser CZE CZH FM Transmitter,Fm Transmitter % FM Radio Transmitter for sale ?czhfmtransmitter,OEM ODM Low Power Fm Transmitter....
A Simple Transistorized one Minute Delay Timer Circuit. It doesn`t include any complex or critical parts. You can use this circuit to generate a time delay of about one minute. That is, When you press the switch (Push button type is preferred) the LED turns....
Reverse engineered circuit diagram of an expensive commercial variable lab power supply. This unit is designed around an ordinary op-amp and easy to obtain parts. Although the unit uses a single transformer with two output windings the circuit works equally....
Zender diode to do the over-voltage protection, this issue might be solved. Am I right or I need to do another thing to protect it. Please give me any advice. A zener diode will help if over-voltage on VDDA if that is the cause of the failure, but with a 12V....
Here is a schematic of a good quality AM radio receiver circuit. The heart of the circuit is MK484 AM radio IC. It is a high sensitivity and high quality IC, it has only three leads and comes in TO92 package and require only few external parts because all....
The following circuit shows about 14 Watt Compact Fluorescent Electronic Ballast Circuit Diagram. Features: similar to a 16 Watt circuit, 14 Watt ....
Solar PV Modules: UL Listed and installed world wide, these solar panels are reliable, with an excellent performance record in the field. You really don`t have to be a mechanic or be mechanically inclined to make your own solar module panels. Prices are....
Here is a schematic of a very sensitive microphone preamp circuit, which can be used to increase gain of microphone or boost the audio signals coming from microphone. The circuit is very simple contains only few components and can be assembled in few minutes....
The hardware configuration when using multiple 1-Wire temperature sensors like the DS1820 is very simple, as illustrated in the block diagram below. A single-wire bus is used for communication between the microcontroller and the temperature sensor. It is....
My daughter wanted a way of measuring static for her science project. While scanning through an old copy of Getting Started in Electronics by Forres....
An audio tone control combines both a Base control and a treble control in the same circuit. Tone controls are found on lower-end audio gear because it saves both front panel space on the unit and only requires one control knob, instead of two separate....
The solar orientation circuit uses a comparator with window control that maintains engine idle as long as the two LDR`s (photoresist) are subjected to the same illumination. In this case, half the voltage is applied to the noninverting input of A1 and A2`s....
The ADM1066 is a configurable supervisory/sequencing device that offers a single-chip solution for supply monitoring and sequencing in multiple-supply systems. In addition to these functions, the ADM1066 integrates a 12-bit ADC and six 8-bit voltage output....
The function of this automatic volume control circuit is to amplify signals without distorting its dynamic compression. The amplitude differences in the signal are levelled off and the disturbing effect vanish. With this tehnique, overcompensation in the....
the circuit schematic diagram of Fan Speed Control which turns on only when needed. when your transistor getting hot, the fan will automatically ...
This circuit mixes H synch. V synch. and actual video. T2 mixes the synch, while T1 serves as an emitter-follower. Bandwidths of up to 25 MHz are typical for this circuit. ..
I don`t want to use carbon offsetting, eg planting trees that nominally soak up some agreed amount of carbon/CO2 (for a while), but rather I want to genuinely and measurably reduce consumption and/or (micro)generate some of the energy that I consume, causing....
Bedini student, Rick Friedrich, presents his set-up and results, claiming that in the process of moving charge from one battery to another through the motor system, that this system can achieve a net energy gain, harvesting energy from the environment....
Various architectures of receivers has been proposed in literature, but most popular architectures among them like Heterodyne, Homodyne, Wideband-IF and Low-IF are presented here. Heterodyne Arch....
All LEDs require some form of current limiting. Connecting an LED directly to the power supply will burn it out in a heartbeat. Overdriving, even briefly, will significantly reduce it`s life and light output. Fortunately, driving a single or a string of low....
A photodiode Dl feeds high gain IR remote control preamp 1C, a CA3237E. U2 is a PLL FM detector tuned to around 100 kHz. The detector output is amplified by U3 and it can drive a speaker or a set of headphones...
The 1956 Regency ATC-1 converter heralded the dawn of a new era for amateur radio. The little converter had only two transistors - one PNP, one NPN, both germanium, both now long obsolete - but they were the start of a revolution. Amateurs responding to the....
How to use a desktop computer to solve the complex arithmetic needed to design state-variable filters for audio use. Construction of a tunable notch filter for measuring harmonic distortion is featured. Audio Amateur Corp. did a beautiful job (as always)of....
This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software....
This unique property makes the ˜paraphase configuration of interest if only treble or bass needs to be adjusted - it is not possible to adjust both at the same time! Essentially, it s the difference in setting of the tone controls that determines the slope....
Here is the circuit diagram of an FM remote encoder/decoder using the ICs RF600E and RF600D. These devices are designed to provide a high level of security and operates from anything between 2 to 6. 6V DC. Various electronic circuits like remote control....
Figure 1 shows the 10. 58 to 10. 74 MHz VFO oscillator circuit. Yes, this is the same circuit that was presented last, but I`ve re-designed to show the Colpitts oscillator more clearly. "L" is approximately 1. 5 uh, 19 becomes a core T50-6 (yellow). The....
This light alarm schematic circuit is designed using some common electronic parts, as you can see in the circuit diagram bellow. This light alarm schematic circuit project will sound as soon as the drawer is opened and light falls on the Darlington....
To operate a microcontroller, you need some basic components to support it and the circuit we call it basic circuit. The components needed are very common and you can find them at any electronics store out there. Here, i will share the schematic of basic....
This system is a control system based on one-chip computer, control the system light in remote-operated way. This scheme mainly solves transmission and receiving of the signal, the program manipulation to different signals after the the signal one is dealt....
Simulation schematic for astable multivibrator Parameters Vcc=24 Vol=1 Voh=21 Power supply Vcc Vcc 0 {Vcc} Time constant R1 Vo Vc 1K C1 Vc 0 100n. IC V(Vc)=0 * *Reference R2 Vo Vr 100K R3 Vcc Vr 100K R4 Vr 0 100K * *Comparator E1 Vo 0 Vr Vc table=(-1m {Vol}....
For mad scientists only ! Portable Jacobs Ladder circuit. A very unique project...
The basic design of this project will use a Atmel AT89S8252-24PC Microcontroller, since this micro has 2KB of EEPROM that can be used to store data during runtime. A ADC0838CCN analog to digital will be used to receive up to 8 inputs from sensor devices,....
A good thing too since I initially hooked the p-channel mosfets up backwards. No smoke fortunately. I`m using Pololu gear headmotors (although continuous rotation servos will also be supported). In order to drive the motors in either direction I`m using....
A steady, flexible, convenient traffic light control system to have necessity and realizability. But a lot of traffic lights are switched over according to a time interval in actual life. And the traffic lights can be according to changing the switching time....
If I disconnect the ground of the Arduino from the negative terminal of the power supply, current flows through the MOSFET, even when the switch isn`t closed!..
If you ever wondered how those phone bugs from spy movies work, here is the schematic for your very own. This simple FM transmitter uses a phone line to both power the device and receive the audio signal. Just hook it up to the phone line you want to monitor....
This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components...
This is small inverter on 30 watts, It converts DC voltage from 12V battery to AC 220V-230V at 50Hz which is electricity same use in your house. It can provide 2-3 Air pump or other. You will like them because so cheap and easy to builds. Then, what is it....
This simple tone control circuit is designed based on the famous Baxendall tone control circuitry. The circuit given here can give a maximum cut or boost of around 12 dB at 10 KHz (treble) and 50Hz (bass). Also, both bass and treble can be independently....
The following circuit shows about Water Level Detector Circuit Diagram. This circuit based on the PIC12F683. Features:PIC Micro has the sleep ....
How to interface a microcontroller to the phone line. The tones you hear as you enter numbers on your phone can remotely control devices. Learn how to use these DTMF tones in your microcontroller projects. This article was submitted by Mayank Magoo as part....
The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for....
My wife was working on a doctoral dissertation and needed to do some field work involving personal interviews in various settings. What would be the best way, technically speaking, to record the interviews To pass a tape recorder or microphone back and forth....
Texas Instruments introduced TPS54618, 6-A step-down SWIFT DC/DC converter. The new TPS54618 monolithic synchronous switcher with two integrated 12-milliohm....
A strobe light passes a brief, intense pulse of electric current through a gas, which then emits a brilliant burst of light. The gas is usually one of two inert gases, xenon or krypton, that emit relatively white light when they`re struck by the fast moving....
These days many more audio-visual devices in the home are connected together. This is especially the case with the TV, which may be connected to a DVD pla....
The TNT Convertus has been one of my favorite designs. It was probably one of the first DAC DIY projects published in Italy, and attracted a lot of attention (well, given the size of the market, obviously. ). A few changes have been made to the original....
Dear friends i need your advice about the connection diagram of the MAX4685 analog switch attached. I have two inputs VI1 and VI2 and hence we have....
This diagram will give you a simplistic idea of how it all works, as you can see the only time left and right come together from the indicator switch is from the stalk to the hazard switch, so get the steering column off too and go all the way from the....
The audio bandpass filter described is useful for amplification and filtering weak AM TV video carriers. For example, a DFM (digital frequency audio multimeter) may have insufficient input sensitivity for measuring extremely weak SSB TV video audio signals.....
The design of the charger is similar to that of many commercially available chargers. The charger consists of a mains adaptor, two resistors and a light-emitting diode (LED). In practical use, this kind of charger is perfectly all right. Resistor R1 serves....
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 circuit diagram, the LEDs are connected in anti-parallel. At every change in level there will only be a....
