Popular Circuits Page 146
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As you can see in circuit diagram, this portable solar charger circuit, is based on a LM358N operational amplifier and one transistor. This regulator provide a constant 2. 4 volts DC and can be used for powering small devices that needs to be powered from....
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The BU8872 and BU8872FS are DTMF receiver ICs developed for use in telephone answering machines, and convert 16 different types of DTMF signals into 4-bit binary serial data. In addition to a compact 8-pin DIP BU8872 or 16-pin SSOP BU8872FS package, these....
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A simple digital thermometer circuit with out a micro controller and having a seven segment LED read out is shown here. The circuit is based on three ICs: CA3162, CA3161 and LM35. CA3162 is a monolithic analogue to digital (A/D) converter that has BCD....
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When a short-circuit to ground occurs, which forces a DC voltage across the loudspeaker of >= V, a built-in protection circuit becomes active and limits the DC voltage across the loudspeaker to <= V. Pin 12 detects the status of the protection circuit (e. g.....
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A pH electrode measures hydrogen ion (H+) activity and produces an electrical potential or voltage. The operation of the pH electrode is based on the principle that an electric potential develops when two liquids of different pH come into contact at opposite....
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One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors, such as thermocouples. This circuit eliminates the need for a special sensor because it senses the....
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This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers numerous advantages. It is intended for charging lead-acid batteries, but may also be used for charging....
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This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses two identical integrated preamp circuits. The second preamp is used in identical manner This mic preamp....
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First of all let me remind you that this circuit is a very dangerous one. The output voltage of this circuit is in Kilo volts and it can seriously injure you or kill you. Try this circuit only if you have enough experience dealing with high voltages. I have....
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The circuit allows a precision regulated drive current to be set to drive an LED, and in response to a TTL level signal, the LED is switched on and off with rise and fall times of less than 500 nanoseconds and less than 7% overshoot. This was designed for....
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The VTG-01 is designed to display user defined text over a composite video signal. This is useful in a multitude of different applications such as adding titles to home movies and adding custom text to security videos. Text can be displayed in different....
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The noninverting amplifier has a gain of R2/R3 (1 in this case) and produces a voltage of V,"" during a positive excursion of Vin with respect to ground. The inverting amplifier accommodates the negative excursions of V..; its gain is given by -R6/R7,....
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I wanted to do some time lapse photography where the camera would take 1 capture every 20 minutes or so of a race car chassis fabrication project. After looking around on the web, I decided the GoPro Hero2 would work. The GoPro has a built-in time lapse....
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The following circuit shows about Repeating Interval Timer Circuit Diagram. This circuit based on the CMOS4060 IC. Features: 6 pin output, IC ....
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Here the simple mixer with 4 input and 2 op-amps: A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net g....
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U1 is configured to operate in the standard astable mode, providing a form of relaxation oscillator. When power is applied, C2 initially charges through Rl, R2 and R3 to two-thirds of the supply voltage. At that point, U1 senses that its threshold voltage at....
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Frequency converters are protected from surges with surge protective devices for which the maximum continuous operating voltage Uc has to be taken...
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I accept acclimated a brace of BC548 transistors in this circuit. Although not carefully RF transistors, they still accord acceptable results. I accept acclimated an ECM Mic admit from Maplin Electronics, adjustment cipher FS43W. It is a two terminal ECM,....
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This circuit function for combination lock with auto reset. 4 Digit Enter Combination, C-Mos Design, Low Standby Power, and 9 to 15 Volt Operation ....
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Voltage Controlled Shape on each Oscillator, Calibrated 1V/Octave Keyboard Input, External Gate Input socket, Portamento/Glide, Patchable Voltage Inverter, Extra Input Channels, Better Panel Components, Power Supply Replacement, Mains Connectors....
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Even though today`s electrical appliances are increasingly often self-powered, especially the portable ones you carry around when camping or holidaying in summer, you do still sometimes need a source of 230 V AC - and while we`re about it, why not at a....
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In the early `80s, I read some articles on LED arrays. They described using arrays of 64 or more LEDs as crude oscilloscopes and other interesting things. I decided I`d make one myself - a really big array, 256 LEDs arranged as 16 columns by 16 rows. In....
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understanding of the function and sizing of the resistors Rg and Rf for the bubba oscillator circuit described on the application report SLOA060 - march 2011, page 17 figure 18. The oscillator porpuse is to develope a current inverter thru the H-bridge....
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Electromagnetic vibration table or feeder is to use small objects after a certain track or cylinder by forced vibration, can be self- made line made to move along the rail tube..
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An Atmega32A chip and I`ve been trying to program it with a usbasp for quite a few hours. I can change the fuses and write the program, but verification fails. The chip can be erased and fuses can be changed, my only problem is with the verification. The....
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automatic gain control. A control circuit that automatically changes the gain (amplification) of a receiver....
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Entire AVR programmer has been build with using common parts and fits in the case of the serial connector. The socketpcb has been created to fit a 28-DIP AVR ATmega8 microcontroller, but you can build a socket pcb for any other AVRmicrocontroller out there.....
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The circuit diagram of the single chip AM radio. The circuit is designed around the IC ZN414Z which is a ten transistor tuned radio frequency ....
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How to connect a LCD display to an Arduino and test it. This tutorial shows beginners how to use a breadboard to connect an LCD display to an Arduno, step by step....
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The AN6426NK incorporates both speech network and hands-free functions. Its well designed block configura- tion allows realization of a hands-free telephone with a minimal number of components. By Panasonic USA ..
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The circuit in Figure 1 can solve this problem by providing a constant 300-mV drop between VIN and VOUT at currents as high as 3A. The accuracy of the 300-mV drop is nearly as good as the accuracy of the input voltage, which in this case is approximately 1%.....
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This circuit is a resonant twin-t filter. In this circuit, its purpose (according to the creator), is to give a decent fake lowpass response , which it does fairly well. Tim`s schematic shows two variations, one with self-oscillation, and one without. I....
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This circuit is a simple series of tone control circuit. This tone control circuits using OP-Amp LM301A. The JFET 2N3684 provides high input impedance function and low noise characteristics for a feedback buffer op-amps operated type tone control...
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Nokia BL-4C / BL-5C are 3. 7V, 700-1000mAh ( variants ) Lithium-ion batteries, have 3 terminals, as explained here, for battery positive-terminal, ground, and a terminal (BSI) which I believe presents a fixed resistance value, that needs to be measured, to....
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I build the CAT SL1 preamp with the attached schematic Noted that the gain of this circuit has about 26dB. I noted that the new SL1 have an option....
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This project operates red, amber and green LEDs in the correct sequence for a single UK traffic light. The time taken for the complete red - red & amber - green - amber sequence can be varied from about 7s to about 2 ½ minutes by adjusting the 1M preset.....
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The Astable Multivibrator, which is generally used as a signal generator, is once again used here to generate the desired frequencies. It is an excellent example of the fact, how versatile simple basic electronic circuit can be. It seems quite obvious then,....
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300A-18V three-phase thyristor power regulator circuit electrolysis It can output DC 3000A, 18V (adjustable), power supply solution processing. Circuit from the main circuit, trigger circuit, part of the synchronous power, DC power, voltage negative feedback..
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DC feedback works shown in Figure l-31. In the circuit, R7 connected to the output terminal (the midpoint of static) D of the differential input stage Vr, between the base. Sta..
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This supply uses an SGS-Thomson UC3842 IC in an off-line flyback regulator, providing + 5 V at 4 A..
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A Solar Engine is a circuit that takes in and stores electrical energy from solar cells, and when a predetermined amount has accumulated, it switches....
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The motors will be driven from the full source voltage, so make sure this isn`t going to make your robot too fast! Firebot has GM3 motors driven with a 9V battery, however the circuit differed and the motors were only driven by 5V from the voltage regulator.....
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The following is a method to allow day and night detection using Infrared/Visible light sensitive phototransistors and a simple LM339 voltage comparator circuit...
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The entire control is handled by a Microchip PIC18F46K20-I/PT microcontroller, programmed with a firmware that controls the GSM/GPRS module`s activity, reads the logic condition of the two opto-isolated inputs and sends commands to the two relays in the....
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Peak voltage sample and hold circuit: peak voltage sample and hold circuit is shown in Figure 12-50. Peak voltage sample and hold circuit south chip sample and hold chip LF398 and a voltage comparator LM311 constitution. LF398 output and input voltages..
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A block diagram of the stereo-TV decoder is shown in A. It shows the overall relationships between the separate sections of the circuit; through show the details of each subsection. The decoder section centers around TCI, a standard 4.5-MHz audio....
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The brief with this project was to produce cost effective electronics that could be assembled by a small, informal PCB manufacturing plant based in India, repaired easily, and producible with the minimum of setup. We used "jellybean" (common/generic/low....
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This design adapts such a high voltage flash for use on a low voltage camera by using an optocoupler to electronically isolate the camera`s contacts from the high voltage. It can then be triggered by the camera using the 6 volt supply from the flash unit`s....
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Rain Alarm. This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used...
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The genesis for this hybrid electrostatic headphone amplifier occurred when I was in Hawaii on vacation, at a fancy hotel on Maui. Sitting at the bar on the beach, drinking "Blue Hawaiis," I drew the schematic for the amp on a placemat. The design is my....
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Some simple 555 and flip flop circuits to add electronic lighting effects to "modernize" the games. I`m collecting quite a few for different aspects of the game - i. e. idle, flipper shot, flowers open, winning shot etc. I have a few hundred LED`s, 20....
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A high-input-resistance op-amp, a bridge rectifier, a microammeter, and a few other discrete components are all that are required to realise this versatile circuit. This circuit can be used for measurement of dc, ac rms, ac peak, or ac peak-to-peak voltage....
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The alarm detector circuit is different from Ultrasonic Alarm (1). In Ultrasonic Alarm (1), an alarm output is presented when there is a reflected wave from the object in the setup time. At the circuit this time, an alarm is output when no reflected wave....
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Shown for the power-saving voltage regulator circuit. The regulator Besides general delay regulator function, its main features are: (1) mains voltage 220V 10% within the safe voltage range, automatic voltage regulator from the power supply, the power can..
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This project gives you a real time clock with the RTC chip DS1307. This RTC chip has inbuilt oscillator for clock and it has its own registers for full...
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We know that every inductor coil has a certain amount of resistance and the coil should have lowest possible resistance. The ratio of the inductive reactance to the effective resistance of the coil is called the quality factor or Q-factor of the coil. A high....
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Circuit consists of an ultrasonic transmitter and T-4 0-16 555 circuit, adjust the potentiometer RP can change the oscillation circuit frequency. 40k 3 feet from the output 555..
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Every key pad button generates 5 bit binary code and IC1 sends this code to the IR leds through D1 and D2 diodes. Code is shaped from 6 pulses with 5 gaps. Pulse position modulation PPM technique is used for transferring data. Data information occurs at....
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The telephone-line extension bell ringer shown will enable you to add a remote ringer in your garage or some other area where a ringing telephone cannot be heard Up to Four ringers can be used on a single telephone line and a remote bell can be used 100 feet....
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The circuit uses CA3290 BiMOS dual voltage comparators. Non-inverting inputs of A1 and A2 are tied to voltage divider reference. The input signal is applied to the inverting inputs.
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The video amplifier in the diagram is a well-known design. Simple, yet very useful, were it not for the ease with which the transistors can be damaged if the potentiometers (black level and signal amplitude) are in their extreme position. Fortunately, this....
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An audio power amplifier can boost weak signals from a tuner, CD player, or tape deck to fill a room with sound. This article focuses on the operating principles and circuitry of low-frequency power amplifiers based on the bipolar junction transistor (BJT).....
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Figure 2-39 is a typical application circuit JS88 manifold, the figure is oscillation resistor R, whose resistance to change can fine-tune the size of the water..
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This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays and a timed Bell/Siren Cut-Off. It`s designed to be used with the usual types of normally-closed input devices such as - magnetic reed contacts - micro....
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A bar graph driver IC LM314 drives anXED display. The LEDs may be separate or in a combined (integral) bar graph display. Calibration: With a precision meter be-tvveen pins 4 and 6 adjust Rl for voltage Vq of 1 20V. Apply 4.94V to pin 5, and adjust R4 until....
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The input signal is applied through R3 to the inverting input of the summing amplifier and the output is taken from the first integrator. The summing amplifier will maintain equal voltage at the inverting and non-inverting inputs. Defining 1/R1C1 as 1 and....
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For some ten years Texas Instruments have been developing solid state speech technology with the result that speech can now be produced which faithfully preserves the character of the spoken voice including intonation, accent, dialect, and pitch. Linked to a....
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The circuit diagram shows a timer 555 based rain sound generator. The circuit requires a 9V dc power supply and can be fed from a 9V battery. The loud speaker for producing sound is of 0. 5W 8ohm speaker. The circuit will readily generate a rain like sound....
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This is Simple Tone Oscillator Generator. It is use transistor 2N2222 and 2N2907 be main part. By control tone sound with R2 - 50K and use 8ohm size. Detail...
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Low light on cadmium sulfide photocell (Radio Shack 276-116) produces series of clicks in miniature 8-ohm loudspeaker. As light increases, clicks merge into audio tone that increases in frequency as light intensity increases. Can be used for classroom....
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Three single-junction transistor time relay circuits It uses pulse charging circuit, and therefore can be done for a long time delay, maximum up to tens of minutes. FIG unijunctions VTi and other groups into the first stage delay circuit, charging the..
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Although not a new device, the LM317 is still a high-performance regulator. Its output voltage is essentially immune to fluctuations in load, supply voltage and temperature and this makes it ideal as the central element in a float charger for NiMH cells.....
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A "servo slower" which has now evolved into a Servo Controller. `Servo slower` units are used to reduce the slew-rate (traverse time) of proportional servos. The most common use in model boats is to control the rotation of a servo-controlled gun turret,....
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Make a 555 timer base circuit such that O/P pin of 555 is held LOW by default at power on, and the I/P pin is held initially at HIGH at power on. The main requirement of my circuit is that until I/P pin is held LOW for say 200ms, then only the O/P pin must....
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This automatic NiCd charger for 9V NiCd batteries is using 555 timer properties and is very easy to build. Why is an automatic 9 volts NiCd battery charger? Because you can leave the battery for charging as much as you like: it will be always completely....
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These versions are the original UV-3R, the UV-100, UV-100 MKII, UV-200, UV-200 MKII, UV-3R MKII, UV-3R+, UV-5R, and the UV-5R Plus. KYD (China New Century (Quanzhou) Communication Electronics Co. , Ltd) also sell a version of the UV-100, UV-200, UV-300,....
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As shown by a circuit TTL hex inverter can constitute a DC/DC converter, the 5V into 12V. This circuit provides all the functionality required for DC/DC conversion. The circuit..
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When the games timer is RESET, two things must happen. The 4017 counter must go back to zero and the 4060 astable/divider must go back to zero. (If we left the 4060 running, it would not be synchronised with the 4017 and erratic times would result. ) The....
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TDA2822 is a stereo low-power op amplifier used in the Walkman and headphones. It can output 250 milliwatts. TDA2822 is an operational amplifier ideal for low production. It is a good option as a stereo preamplifier circuits high-powered amplifier. It has....
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This basic oscillator will detect the Earth magnetic field. The ferrite rod and coil are taken from an old Medium Wave receiver and a small magnet is glued at one end. Tune to a medium wave commercial station until you hear a beat note. Any movement of the....
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The Sparkfun Solid State Relay (SSR) Breakout Board is shown below. An SSR works like a relay but is built using semiconductors for switching. It will run off of mbed`s VU 5V supply and works with any mbed digital output pin. The schematic is shown below for....
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The NCP5810D is a dual ’output DC/DC converter which CAN generate both a positive and a negative voltage. The device is optimized for powering modules such as AMOLED Display drivers where very good output voltage accuracy and regulation, signal integrity and....
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A portable CD player, radio, cassette player, a couple of microphones and PC sound card. I am feeding these into the inputs of an audio mixer the output of which is attached to a pair of active loudspeakers. I want to be able to monitor the signal levels....
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This is the circuit diagram of UHF band TV antenna booster with 15dB gain power. This low cost antenna booster is simple and easy to build. This circuit formed based on BF180 UHF Transistor. The first stage is an band pass filter constructe....
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The Infineon C16x Series of µCs use an internal 16-bit-register architecture. The architecture can also process byte-wide functions. The µC uses byte moves to implement library functions such as memset() or memcopy(). This process makes the library code....
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It is fun to make a variable space in your small room, but it`s hard to make the actuator to move your wall or room partition. Using analog audio line delay,...
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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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An year ago, I`ve shared a circuit of USB li-ion charger based on LM358opamp. The circuit had some problems as reported by commentators that inclide wrong direction of LEDs. Don`t post your email or phone number in the comment box. Only put email address in....