New Circuits Page 28
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TDA 2030 is a widely used 14W audio power amplifier monolithic integrated circuit in Pentawatt [ package, intended for use as a low frequency class AB amplifier. However some home theater prototype came with For low frequency subwoofer amplifier using 2030,....
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The GLMDPCB motion detector board is a double sided etched, screened and drilled printed circuit board designed for the GLMDA motion detector circuit shown in the schematic below. All or part of the circuit can be built. For some robotic and other special....
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The circuit is based around the LM324 low power opamp which draws around 3mA of current, so it won`t bother the battery if left connected for extended periods....
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This is a circuit for oscillator using astable mode operation. The basic oscillatior is using 555 timer IC. This circuit is also give mode free running oscillator. This is the figure of the circuit. Operation of the circuit is begin, when initialy by....
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One of the simplest method of metal detecting is by beat frequency oscillator. Basically, the circuit consist of two balanced oscillator. One oscillator provides the reference signal, and other oscillator is acting as the detector element. The reference....
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Part of the difficulty is that multiple caps/resistors are in the circuit in RIAA. This is based on the Harman-Kardon schematic: I don`t have the Cit IV info handy, sorry. but there are so few parts in a Cit IV that it`s easier just to replace them all. If....
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In this circuit, a simple calculator, in conjunction with a COB (chip-on-board) from an analogue quartz clock, is used to make a telephone call meter. The calculator enables conversion of STD/ISD calls to local call equivalents and always displays current....
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The transistor switches ON and pushes the magnet away, and at the same time the transistor switches off, the stored energy in the coil is going to collapse and the only way it can go is into the charging battery. The next magnet arrives, and the process....
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Surround Sound Decoder circuit diagram. The circuit`s operation starts as the stereo sound signal transports surround sound information on the master volume part of the circuit. This will drive the Left channel Lch attached to Model TL072 IC1A and IC1b in....
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Here is a simple head phone amplifier circuit that can be used to drive your head phone if your music player doesn`t have enough power to drive your head phones. The circuit is straight forward and uses only three transistors. The transistor Q1 (BC 239) and....
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It provides a fully featured commentator position and a line-level input. The unit has an individual commentator output, with an additional output providing a mix of commentator and line input audio. A limit indicator on the main panel shows when the....
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Public Lab is an open community which collaboratively develops accessible, open source, Do-It-Yourself technologies for investigating local environmental health and justice issues....
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The Atmel ATmega series of microcontrollers are very popular due to the large number of peripherals inbuilt in them. They have features such as internal PWM channels, 10-bit A/D converters, UART/USART and much more, which are useful for a lot of applications....
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LM1801 Water Level Sensor Circuit Diagram. Features: reference voltage is overshot and the IC drives the ceramic transducer to beep, low power ....
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This was a Student Project of mine, it is a very basic instruments that could do most of the tasks on a test bench. The cabinet used, was available as a part of a Hi-Fi DIY System, The Range and Mode switches were Modular Stackable Interlocked MultiPole....
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Designing a power supply that meets the demands of Power over Ethernet (PoE) and Voice over Internet Protocol (VoIP) applications can be challenging. The low component-count power supply depicted in the figure meets these specifications without the need for....
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A high-voltage current-limiting transformer (T1) supplies power to the basic LC tuned circuit. As C1 charges to near the transformer`s maximum output voltage, the spark gap`s air space breaks down, completing the circuit between the inductor and capacitor,....
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The drawing below illustrates a multistage light sequencer using descrete parts and no integrated circuits. The idea is not new and I hear a similar circuit was developed about 40 years ago using germanium transistors. The idea is to connect the lights so....
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The Tiny Remoteis a very compact infrared remote control with only two buttons to control an iRobot Roomba. It produces three different infrare....
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The schematic diagram for the circuit is given in the picture above. Like its name suggests, a comparator compares two given voltages. The pair of 1K....
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Did it ever occur to you that an array of white LEDs can be used as a small lamp for the living room If not, read on. LED lamps are available ready-made, look exactly the same as standard halogen lamps and can be fitted in a standard 230-V light fitting. We....
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Step up part of this inverter circuit using a transformer 12VCT/500VA in secondary and primary 0 - 220V. While the frequency is determined by the flip-flop which is set to 50 Hz...
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The circuit for the rs232 serial interface is of mild complexity. The main parts of the circuit are the 18F4520, MAX233A and DB-9 Connector and these portions of the circuit will be described briefly below. This is a basic +5v power regulator circuit for the....
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Just like my previous circuit using LM358 this is also very cheap, also under 100 rupees. This is a circuit for controlling the street lights, garden lights, automatically. You don`t need to turn it on and turn it off again and again, just turn on the....
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L1, Q1, L2, and L3 compose an RF amp’’fter stage that feeds Ml, a doubly balanced mixer. Q4 is alocal oscillator stage In the 375-MHz range Signals h the 420 ‰to 450-MHz range from Q1 are mixed in M1 and fed through filter L6/L7/C17, where only the 60- to....
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This is the circuit diagram of a very simple up down counter that can be used of a large number of applications. The circuit is based on the IC CD40110BE which is a CMOS decade up/down counter. For ICs are used here. Common cathode seven segment display is....
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Square wave generator with CD4070. with this circuit it can generate square wave up to 2 MHz In this example I use CD4070 CMOS. VDD :...
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Most of the CDROMS available have an Audio-Out Output to either plug in the headphones or connect it to an amplifier. This circuit enables one to use the CDROM as a stand alone Audio CD player without the computer. This circuit is nothing but a power supply....
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This is a very easy circuit that every one could make and have fun. This project popped out of nowhere, one day that i was trying to control the TV from the serial port of the computer. It took me no more than a few minutes to understand the simple method....
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The problem with this monitor is that the power supply for the vacuum tube back lighting dies. The first step is to totally disassemble the monitor into little pieces, then carefully remove the gold colored trays that hold the vacuum tubes. Then carefully....
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To boost the output power of low power FM broadcast band exciters, a number of these are available commercially, both as kits and ready made. See How to be a Community Radio Station for links to reviews of some of the more popular exciters. Unwanted spurious....
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Built servo tester cicuit as shown - only action is for the servo to twitch when power switched on, cannot see any real reason why wont work - ideas anyone I haven`t built this circuit yet so I can`t comment on the circuits efficacy. I do have some....
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All of the above would be internal hardware issuesa. Still, there is a possible fix; though not quick-n-easy and neither is there a workaround. The unit would have to be opened up for visual inspection, voltage measurements, confirm fault and effect repairs.....
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I love the Arduino as a simple and accessible controller platform for many varied projects. A few months ago, a purchased an Ethernet shield for my A....
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LM555 timer circuit is similar to the one above but employs two stages so that both the pulse width and delay can be controlled..
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Here remote Sun SPOT will send data to Sun SPOT on car which will drive the IC according to DC IO pins D0 - D3. The IC will drive the Motors which will run the car. package org. sunspotworld. demo; import com. sun. spot. io. j2me. radiogram. Radiogram;....
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A wide range auto turn OFF timer covering 1 minute to 20 hours in three ranges....
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This circuit is a very simple manual analogue light controlling desk which outputs standard 0-10V control signals suitable for controlling professional light dimmers and other lighting equipments. The output of the controller shall be a steady DC voltage....
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Lead acid battery charger schematic using IC LM317. This lead acid battery charger circuit is simple to build and can be fit in a small box. ....
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The circuit works by varying the firing angle of the Triac. Resistors R1, R2 and capacitor C2 are associated with this. The firing angle can be varied by varying the value of any of these components. Here R1 is selected as the variable element. By varying....
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A simple light activated switch circuit with diagram and schematic using IC LM 311-wired as a voltage comparator and an LDR that acts as light sensor...
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A grasshopper is a switch that is ready to go off at any time. A piece of plastic is placed between two switch contacts to keep them apart and connected to cotton thread fixed to the floor. When the object is moved, the cotton pulls the plastic out of the....
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Well this is a Very Accurate LC Meter based on PIC 16F628A. Having inspired from surprisingly accurate LC Meter. This is my attempt to build an accurate L/C meter. This design is little different from other designs found on the internet. The goal of my hard....
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In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor. Energy is stored in the inductor while the transistor is on, and released into the load circuit when the....
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When the water is empty the wires in the tank are open circuited and the 180K resistors pulls the switch low hence opening the switch and LEDs are OFF. As the water starts filling up, first the wire in the tank connected to S1 and the + supply are shorted by....
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In DA3, DA5, VT1, VT2 assembled the first channel of the VLF class D. The second channel, respectively, collected on DA4, DA7, VT3, VT4. At the output of the first and second channels are formed antiphase sine wave VLF..
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This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply.....
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This tutorial continues on from ATmega8 Breadboard Circuit Part 1 where we build a small power supply on the breadboard. In this part we will add the ATmega8 microcontroller and an interface to allow it to be programmed. The first step is to orient yourself....
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The back to back diodes are there because some radios present high voltage transients when switching bands which will lock up the DFD requiring it to be turned off and back on to unlock. If power for the backlit display is to be taken from Vdc when AC is....
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This unit can be useful as a short-range, single-channel remote-control. When the pushbutton in the transmitter circuit is briefly activated, the LED D1 in the receiver illuminates and an optional beeper or relay can be operated. Circuit operation is based....
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Example if you press number 8 it will effect the wire ROW3 and CLO2. By this the microcontrollercan determine what key was pressed with only 7 wires from the keypad. ..
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The 751 required turning the volume control almost to 12 o`clock before getting any hearable volume so I thought maybe something was wrong here. I replaced all the electrolytics associated with the audio path, i. e. after the detector stage and the audo amp.....
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This is a circuit that used to main pulse. The pulser is intended to switch the mains voltage on and off at intervals between just under a second and up to 10 minutes. This is useful, for instance, when a mains-operated equipment is to be tested for long....
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This is a circuit for universal decoder that has functions as either a dual 1-of-4 decoder or as a single 1-of-8 decoder, depending on the signal applied to the Mode Control (M) input. Here`s the figure of the test circuit; In the dual mode, each half has a....
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The giant (by radio control standards) servos above are shown adjacent to a Nokia 3310 mobile phone to give an idea of the scale. The arms are 12cm long - perfect for lifting a bank of solar panels (wing). Our local Model Aerodrome in Seaside Road,....
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Ultrasonic sound wave can be generated using electronic circuit. This simple electronic circuit can generate an ultrasonic wave with frequency range of 12 to ...
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3V FM Transmitter Circuit This project provides the schematic and the parts list needed to construct a 3V FM Transmitter. This FM transmitter is....
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A multivibrator which generates square waves of its own (i. e without any external trigger pulse) is known as astable multivibrator. It is also called free ramming multivibrator. It has no stable state but only two quasi-stable (half-stable) makes....
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A small ultrasonic cleaning device and it runs 1 x 50W transducer at the moment. I am going to build another that uses two 20W transducers and was just wondering what the best configuration is, to wire them in series or in parallel My circuit designs should....
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This is the circuit diagram electronic door lock security key system. It means that this security system circuit is the combination of pressed key itself (not the mechanical), the output can be connected to drive the relay to open the door....
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DESCRIPTION This project is to make a clone of Arduino Leonardo in a simple way.That is why the distribution of the pin does not match the standard Arduino...
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The three-tone ringing integrated circuit U4076B in conjunction with a piezo transducer or loudspeaker replaces the normal electromechanical telephone bell. It is operated with the ringing current fr....
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A very simple water level controller circuit based on 555 IC and 6 transistors. A relay is used for switching the pump motor....
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The key to using a soundcard successfully in digital signal processing or digital radio applications lies principally in the characteristics of the soundcard itself. This applies in particular to SDR (software de ¬ ned radio) programs that turn your PC into....
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This high voltage white LED driver electronic circuit schematic is based on the NCP5021 IC manufactured by On Semiconductor. This NCP5021 high voltage white LED driver electronic circuit is designed with ambient light sensing feature. The NCP5021 white LED....
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LED light chaser circuit typically refers to an electronic configuration able to generate or illuminate a group of LEDs in somepredeterminedsequence. One popular IC 4017 is very commonly employed for making this type LED sequencer circuit. The IC basically....
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The following circuit shows about 12V PIR Sensor Timer Circuit Diagram. Features: 12 Volt DC, will turn on a floodlight or other device for a time ....
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As no one wants to listen to discriminator noise, the proper operation of the squelch circuit in any FM radio is vital. In a repeater, the squelch / COR is even more critical. The basic function of a squelch circuit is simple: detect the presence of a radio....
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This is 6 Channel Audio Mixer circuit. 3 channel for microphone input and the others 3 channel for audio input like CD player, computer, or television. There will be 6 potensiometer to control the volume of each channel. Make a PCB in very easy steps. !....
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This is an ongoing project I`m working on which started as a circuit that I decided was necessary to be able to neatly interface the nNovia QC120 A2D2recorder to a Sony DXC-325P camera with CA-325P studio back. I`m still working on the final design. I have....
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Build this exciting Jacob`s Ladder and watch electric arcs ascend the ladder and evaporate in space. It works from a clever 12, 000-volt power supply. Author Robert Iannini. " People have long been fascinated by electric arcs-and perhaps put off by them.....
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This sensor switch circuit has nine channels and consist of only three integrated circuits and some resistors. Due to high input impedance, 74HC147 allows to use of 4. 7 M resistors to create a logic level "high" to sensor inputs. When one sensor is touched,....
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Is the battery empty, or is there something wrong with the device That`s always a difficult question when your walkman or some other battery-powered device appears to be dead when you switch it on. Before you take it to the shop for servicing, the first....
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The original power supply AC-3400 with charger function. Except for the button and the indicator of inclusion, on the forward panel there is an indicator of a level of a charge of the accumulator, a start button, and a socket for connection of the....
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There are 2 kinds of solar automatic tracking controllers. One is Schmitt trigger light control composed of a light sensor and a Schmitt trigger or monostable trigger. The second one is usingtwo light sensors and two comparators to form two light-control....
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The below diagram shows H-Bridge with 4 inputs and external power supply, the control application must allow the motor to be operated in forward and reverse directions..
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I am a beginner/hobyist and would like to learn more about Microcontrollers. All I want to do is receive an output on an LCD when pressing a button on the keypad. ..
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The new archetypal of RS485 advocate overcomes the RTS controlled botheration accomplished by our chargeless design. However, to do that requires a microprocessor, so there is a greater complication to the design. We advertise this unit, although currently....
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The schematic shown here can be used as a circuit for Car brake light or headlight flasher for flashing two 10 watt 12 volt lamps in car or any vehicle. ....
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Below are three examples of controlling a relay from the PC`s parallel printer port (LPT1 or LPT2). Figure A shows a solid state relay controlled by one of the parallel port data lines (D0-D7) using a 300 ohm resistor and 5 volt power source. The solid state....
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This two-zone alarm has automatic exit, entry and siren cut-off timers. It was developed for the Beginner`s Guide To Cmos Timers. So it has a particularly detailed circuit description. There`s an optional One-Time-Only module. It will force the siren to....
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Fans in PCs can be objectionably loud. In many cases, the amount of noise produced by the fan can be considerably reduced by lowering its speed. Although this will decrease the amount of cooling, this need not be a problem as long as you don`t go overboard....
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This circuit operates with 230v. you can use this circuit to decorate your parties. I think this will be a wonderful circuit to you all. This circuit was taken from my old circuit book called 100 circuit book. Here DIAC ER 900 and Triac BTW 11-400...