Popular Circuits Page 132
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This is based on a circuit from the superb electronics info pages at. If you want to know more about IR remote controls, from circuit details to data protocols, look there for info (under `remote control`)! This design allows multiple transmitters and....
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Audio amplifier circuit board DUAL LOW NOISE EQUALIZER AMPLIFIER The KA2221 is a monolithic integrated circuit consisting of 2-channel low noise amplifiers and regulated power supp;y for car stereos. FEATURES suitable for car stereos. Low noise amplifier.....
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A VU-meter is a very common instrument usually installed on audio Hi-Fi amplifiers and is used to show the instantaneous power provided to the speakers. It is usually connected at the output of the amplifier, in parallel with the speaker. The term "VU"....
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This handy prescaler divides input frequency by 1000. It takes maximum input frequency of 3. 5GHz and converts it into 3. 5MHz that may be measured using standard frequency meter...
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AC power is supplied via AC Fuse F1 and Power On/Off switch S1 to 6. 3V filament transformer T1. Fuse F2 is provided as an additional safety feature, since a short to the filament transformer may not be enough to blow the main power fuse. Hum balance pot R1....
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Including Preamp, Tone Controls, Reg dc Power Supply, 18 Watt into 8 Ohm 30W into 4 Ohm loads This project was a sort of challenge: designing an audio a....
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1.5 Volt Tracking Transmitter, Simple circuits , The current draw for this tracker is 3.7mA, so the 1.5V button cell will last awhile. What the heck am I suppose to hear you ask? When your circuit is....
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That circuit is similar in concept to the BK Butler/Tubeworks Tube Driver. Since there is only a 9v supply, the tubes operate in "starved plate" mode. Preamp tubes normally operate on 100v-300v. It`s similar to using a Variac on a tube amp. When there is....
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Some serious overengineering was required to match my previous capacitive scanner. At the local hackerspace OSAA I went on to start a brainstorm with pedersen, AsbjG rn and Flemming, who promptly came up with a lot of funnyideas. All nice and well until....
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Our present car controller runs on a single PIC16F870 micro and provides functions for remote door locks, headlight reminder, and car finder. It is constructed using wire-wrap to allow for future expansion and is mounted using Velcro on the passenger side....
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Desheng Rl212A 12-band FM, MW, SW, television sound stereo radio circuit diagram as follows: ..
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This is the very simple way to play a song with single 1. 5 battery. You can build this circuit for gift acceccories. When the gift opened, then a song will be played. It`s easy and cheap right. :D. It just use a single small chip which will generate a song....
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Here`s an another project, which makes an Scrolling LED display. Here 64 leds which are connected to an Matrix display. The Anodes are drived through an Driver IC UDN2981 and the cathodes are drived through ULN2803. The Atmega8515 is used in this project to....
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Designing wide range variable power supply using linear regulator is easy, but suffer terrible efficiency when it should regulate 60 Volt constant source ....
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A delay circuit using an operational amplifier It uses an operational amplifier A as a comparator, high timing accuracy. The timing of the timer is in the range of 1 ~ 30s. Del..
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A very simple and easy telephone line tester circuit or telephone line checker circuit which can be used for testing telephone lines. ....
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This circuit using a dual-timer NE556 can produce 1Hz pulses spaced 5 seconds apart, either manually or automatically. IC NE556 comprises two independent....
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This automatic door opener can be made using readily available components. The electromagnetic relay at the output of this gadget can be used to control t....
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This circuitis not complex, but it saved the day in an application involving visual inspection of the spray pattern of fuel injectors for quality and consistency. In this application, xenon strobe lights did not work because they take up too much space, and....
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To charge lead-acid batteries we can use this circuit that consist of a current-limited power supply and a flyback converter topology. Here is the schematic....
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Mostly everything has been put together for the electrical portion of the project. Serial communication is almost working and will be used in conjunction with a Teensy 2. 0 chip to communicate through serial USB and the mega128. A TTL UART serial driver such....
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This circuit is a mono audio amplifier that will boost low frequencies as you see at the frequency response. The circuit is suitable for driving a subwoofer speaker for example. The output power of the circuit is about 1 Watt with a 4-ohm speaker. ..
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The digital delay presented here is expected to be sufficient for most applications, and although the delay is fixed at 20ms, this is the most usable delay period. This is the equivalent of being about 7 metres away from the rear speakers, and they will have....
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I some cases, a differential input is needed for voltage measurement. Using the only one operational amplifier, you can build an adapter to provide a floating...
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This low cost AVR development board can be used to get started with 40 PIN AVR devices or to test and build projects easily. Get this board along with our USB AVR Programmer and you have complete development and learning platform. The bundled CD provides all....
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Figure (a) is the use of a microprocessor power supply circuit constituted LT1587-3.45. Figure (b) is constructed using the LT1585 output voltage adjustable power supply. Figur..
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1990 Toyota Corolla Brake Light Wiring Diagram...
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Using this electronic schematic, can be designed a very simple cellular phone detector circuit which can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters. The C3 capacitor must have leads length of 18 mm with 8 mm....
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The quartz clocks which have dominated time-keeping for the past 20 years or so have one problem: their errors, although slight, are cumulative. After run....
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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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A MIDI interface for an automatic accompaniment or controlling an MIDI expander. MIDIvice supports both manuals and has some nifty program features. It`s a MIDI output interface for upper and lower manual, working with a dirt-cheap 8031 and single-sided PCBs....
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Amp circuit as shown in the pre-television. The pre-amplifier circuit is Qioi and other parts of xlol. Q [ol and biasing element is configured as a common emitter IF amplifier,..
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90 color TDA4866 power amplifier for the vertical deflection system, vertical deflection frequency rate is 50 ~ 160Hz. CRMM circuit provides a high current drive input. Since t..
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The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the primary of the coil. A 2uF capacitor is charged to about 340 volts and the discharge is controlled by an SCR. A Schmitt trigger oscillator (74C14) and....
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This circuit was industrial to power an AVR microcontroller from a 12 opposed to run-acid battery. The watchdog itself draws solitary 14 µA. Of avenue, at hand are dyed-in-the-wool ICs, in lieu of model from Linear machinery or else Maxim, which can subsist....
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Detects the amount of salt contained in liquid foods, Three-level LED indicator This circuit was designed to detect the approximate percentage of salt con....
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2012 Honda Odyssey Radio Wiring Diagram Manual PDF Download...
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The following circuit shows about 2500W Phase Control Circuit Schematic. Features: tied to ground trigger output disabled, ow voltage input to ....
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The difference between instantaneous frequency and central frequency of the carrier will be directly proportional to the instantaneous value of the amplitude of message signal. 555 Timer wired in Astable Mode can be used for generating Frequency Modulated....
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This circuit provides the tum-on characteristics of an SCR, but turns off with ease. The switch is comprised of three transistors with descending current ratings: Q3 has a high-current rating and Q2 has a medium rating. The current, !1, to be switched....
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Building battery boxes for the Speedster. While not an exciting topic, in converting almost any car to electric drive, most new builders are surprised to learn that making the car run on battery power is almost trivial. But 50% of the work centers on placing....
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Almost all 24V power systems in trucks, 4WDs, RVs, boats, etc, employ two series-connected 12V lead-acid batteries. The charging system can only maintain the sum of the individual battery voltages. If one battery is failing, this circuit will light a LED.....
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This radio reciever can work with any of the following transistors zn414, mk484 or ta7642...
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The circuit has both square-wave and triangle-wave output. The left section is similar in function to a comparator circuit that uses positive feedback for hysteresis. The inverting input is biased at one-half the Vcc voltage by resistors R4 and R5. The....
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The MK-319 is a fixed cardioid-pattern, large-diaphragm condenser microphone. The capsule assembly is the same as the MK-219; the primary differences between the models are: The diaphragm is gold sputtered teflon, mounted to a center-terminated capsule....
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Using only 2 capacitors, 3 resistors, 4 seven-segment Display, 1 xtal, 2 switches n.o. and 1 Microcontroller PIC, you can build this Digital Led Clock. you can use common anode or common cathode display, just select the display type. Here is the pinout....
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Setting circles on an astronomical telescope are used as an aid to pointing the telescope at a particular object in the sky based upon the object`s celestial coordinates. However, setting circles can be difficult to use effectively and are usually not....
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This thermometer uses an LM19 sensor calibrated for measuring a wide temperature range (-55 130 Celsius, -67 266 Fahrenheit) for outdoor temperature measurement and an SHT21 digital thermometer with humidity measurement for indoor use. An ATmega328....
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VIC-20CR rev. D (NTSC, new design). Assy number 251027-01. The PAL model has a crystal frequency of 4433618 Hz, and there is an extra 56pF capacitor on the solder side of the board, soldered parallel to R5...
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As the market strives for lighter, more compact wireless and portable devices with more ingenious features crammed into an ever-tighter space, a related quest ensues for the next power supply innovation ” a powerful, compact, long-lasting, economical and....
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A relatively High power H-bridge motor controller (which is the most common way to control DC motors) With cheap TIP transistors. 5 Amperes of continuous current through an H-bridge module may not seen high power to someof you, depending on your field and....
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In this article we show that enhancement mode GaN transistors enable significant efficiency improvements in resonant topologies and demonstrate a practical example of a wireless power transmission....
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This circuit uses an SAD 512D (Reticon) chip, which is a 512-stage analog shift register. By varying the clock frequency between 5 and 50 kHz, delay time can be set between 51. 2 and 5. 12 ms. The clock fre-quency must be at least twice the highest audio....
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AC mains operated single LED flasher circuit, built using the popular CMOS timer chip TLC555 is shown below. The whole circuit is powered directly by the grid supply of 230VAC through a capacitive potential divider and associated components....
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Circuit is shown using the 4046 PLL FM demodulation circuit device comprising, IF FM demodulation circuit output by the input signal frequency signal. ..
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Originally Posted by tiefbassuebertr Unfortunately I find only RF amplifier devices there (lowest frequency: 10 KHz). It would take the colloquial....
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Circuit works: QM-NJ9 is alcohol sensor. QM-NJ9 contact after the odor of alcohol, the resistance value A, B between the reduced..
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An adaptable siren generator circuit with a multitude of uses is shown. It is based around a 556 twin-timer chip, IC1. An audio tone is created by one timer section and is directly coupled to the driver transistor, TR1. The other half of the timer is used to....
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ICla and IClb form an astable multivibrator. The astable"s signal is fed to IC1c, also to the clock input of IC2, a 4017B decade counter. That IC"s QO through Q9 outputs become high one at a time for each successive clock pulse received at1Jin 14. Switch....
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A circuit that will block my TV and any device I choose from getting a signal from the normal remote control. I turn an ordinary remote into a jammer and the remote still works normally! Watch the video to see it work. I chose to use a Sony remote control....
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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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FM Beacon Broadcast Transmitter (88-108 MHz). This circuit will transmit a continuous audio tone on the FM broadcast band (88-108 MHz) which could used for remote control or security purposes. Circuit...
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Article about full automatic 6V 4.5AH battery charger circuit with schematic using IC LM317T and few components. The circuit can charge 6V lead acid battery. ....
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The DIAC, or diode for alternating current, is a trigger diode that conducts current only after its breakdown voltage has been exceeded momentarily. Most DIAC....
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A pulse booster circuit When you need to increase the pulse amplitude, pulse boost circuit can be used, its structure, the figure (a) of the circuit can output pulse amplitude ..
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Astable multivibrator or oscillator circuit is based on positive feedback. We can design such circuit using op-amp, logic gates, or transistors. Here we can...
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A simple alarm circuit with diagram and schematic that generates multi tone sound. This alarm circuit is suitable to use in burglar alarms and sirens and is designed using dual op amps MC1458 and LM 380...
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The color wheel and motor control are up to you. Yes, this is field-sequential color, not the "compatible color" that came along a few years later. After we detail the wiring changes, we`ll tell you more about the wheel. Anyway, even without the wheel,....
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This amplifier employs a cascaded op amp integrator and transistor buffer, Q1, to drive the gain control element. Except for a simple modification, the HA-5190/5195 stage is connected as a conventional noninverting op amp, and includes input and output....
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This SCADA controller is designed for use with distribution (13. 2kV/4. 8kV) substation transformer breaker positions where an automatic throw-over is present. The RTU voltage is 24V. DC. The breaker status and Lockout relays operate at 48V. DC...
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Switched-capacitor filters that are preset for a given bandwidth sometimes do not deliver the bandwidth or Q an application requires. By inverting the clock between two switched-capacitor bandpass filters, such as the MSFS1 from Mixed Signal Integration....
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The UJT-oscillator frequency is determined by the 100 µ¥ capacitor and the effective resistance of the 22 and 470 resistors and the potentiometer. Rate can be varied from 42 to 208 beats/minute.
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The circuit uses the primary current of a small 6 volt filament transformer to actuate a triac and energize the load. When switch Si, in the six-volt secondary, of the transformer is open, a small "magnetizing" current flows through the primary winding. This....
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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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Application of the differential amplifier circuit in a simple small oscilloscope ..
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On your circuit 5v was the most common voltage for electronic components, everything was 5v, and a lot still is now. USB is still a 5v protocol, and many microcontrollers are still 5v. As electronics have become more efficient and smaller however, their....
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One car audio amplifier with TDA1562Q that can output 50W of audio power. TDA1562Q car amplifier circuit diagram 2 resistors 1 KOhms 2 resistors 4,7 KOhms....
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This is a very simple circuit where the PIC and an internal 1kHz sinewave table do all the hard work of making an accurate sinewave. Then it needs only a few external parts for filtering. The sinewave has a very high frequency accuracy as it is generated....
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This is an add-on Over Voltage Circuit for the LM317 Regulator Circuit submitted by Matthew Hewson. It is a voltage regulator that allows a 6v portable supply to be derived from the 12v car battery. You can add a 6.2V zener diode and a LED to warn you when....
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DK-5A, DK- 5AD AC power control circuit circuit shown in Figure 6-77. Figure, SBz the closing button, YA line for the closing electromagnet coil, U.,..
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A listener standing some distance from a sound source will perceive sound that is actually a combination of direct sound and indirect sound that has been reflected from the boundaries of the listening area. The reflections are referred to as reverberation.....
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This is the special circuit design of power supply failure alarm. The vast majority of the power supply failure alarm / indicator circuits require a independent power supply for themselves. However the alarm circuit introduced right here re....
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The following plans describe how to build a very small tracking transmitter that can be tracked using an FM broadcast band radio receiver. The transmitter is powered by a 3 volt to 9 volt battery and has a range of from 1/4 mile to over 1 mile depending on....
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Circuit shown in Figure, the dashed line in FIG left portion as an ordinary lighting circuit, the right part of the production of the double bonds of touch with NE555 3-3 Switc..
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The B8422 Nixie tubes were destined to end up in an alarm clock on my bedside cupboard. My house is slowly filling up with homemade clocks, only our bedroom has so far been saved from the "collateral damage" of my clock making mania. A set of romantically....
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Useful for liquids level detection and proximity devices, Up to 50 cm. range, optional relay operation This circuit is useful in liquids level or proximit....
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Using the ISL6185 USB power controller family can be designed a very simple USB power supply electronic project that provides fully independent overcurrent (OC) fault protection for two or more USB ports. This product family consists of sixteen individual....