tag:blogger.com,1999:blog-57289659428249629692024-03-14T02:08:27.962-07:00diagram ingramAnonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.comBlogger224125tag:blogger.com,1999:blog-5728965942824962969.post-4393053644164970092014-01-10T20:00:00.001-08:002014-01-10T20:00:35.157-08:00Video Switch for Intercom SystemNowadays a lot of intercom units are equipped with video cameras so that you can see as well as hear who is at the door. Unfortunately, the camera lens is perfectly placed to serve as a sort of support point for people during the conversation, with the result that there’s hardly anything left see in the video imagery. One way to solve this problem is to Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-50446927195754896712014-01-10T08:45:00.001-08:002014-01-10T08:45:34.092-08:00Motor Speed ControlThis circuit will allow you to control the speed of an AC motor, for example an electric drill. The way that this circuit works is as follows. The bridge rectifier produces dc voltage from the 120vac line. A portion on this current passes through the 10K ohm pot. The circuit comprised of the 10k pot, the two 100 ohm resistors and the 50uf capacitors delivers gate drive of the SCR. The diode D1 Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-91140375224169309462014-01-09T21:45:00.001-08:002014-01-09T21:45:04.701-08:00Intelligent Electronic LockThis intelligent electronic lock circuit is built using transistors only. To open this electronic lock, one has to press tactile switches S1 through S4 sequentially. For deception you may annotate these switches with different numbers on the control panel/keypad. For example, if you want to use ten switches on the keypad marked ‘0’ through ‘9’, use any four arbitrary numbers out of these for Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-3847171486872842922014-01-09T21:30:00.001-08:002014-01-09T21:30:29.902-08:00Simple Bilateral Current Source Circuit DiagramHi Friends ! I am sorry for dont update i post because i am busy few days. OK to day share with you Simple Bilateral Current Source Circuit Diagram This circuit uses a CA3193 precision op amp to deliver a current independent of variations in RL. With RI set equal to R3, and R2 approximately equal to R4 + R5, the output current, h. is: VlN (R4)/(R3) (R5). 500-I`A load current is constant for Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-55232207165249042262013-12-27T09:00:00.001-08:002013-12-27T09:00:15.020-08:00Long Range FM TransmitterThe power output of many transmitter circuits are very low because no power amplifier stages are incorporated. The transmitter circuit described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250 milliwatts. With a good matching 50-ohm ground plane antenna or multi-element Yagi antenna, this transmitter can provide reasonably good signal Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-21664550595801813272013-12-26T07:30:00.001-08:002013-12-26T07:30:08.333-08:00Simple Gated AlarmSometimes the need arises for a simple, gated, pulsed alarm. The circuit shown here employs just four components and a piezo sounder and is unlikely to be out-done for simplicity. While it does not offer the most powerful output, it is likely to be adequate for many applications. Circuit diagram : Simple Gated Alarm Circuit DiagramA dual CMOS timer IC type 7556 is used for the purpose, with each Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-86965864229988716772013-12-25T04:45:00.001-08:002013-12-25T04:45:11.506-08:00The mutual inspection of cell phone jammer should also be performedThe mutual inspection of cell phone jammer should also be performed.In addition, the rural market is a new market segment, a large number of competitors have not yet entered the competition is not intense, very favorable for Amagatarai phone. Monopolistic tendencies of foreign brands on the channel, so for phones Amagatarai, the key point is to find a breakthrough, in order to build a massive Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-59403659154845286332013-12-24T02:00:00.001-08:002013-12-24T02:00:13.838-08:00Electric Guitar PreamplifierHere is the circuit diagram of a guitar preamplifier that would accept any standard guitar pickup. It is also versatile in that it has two signal outputs. A typical example of using a pick-up attached to a guitar headstock is shown in Fig. 1. The pickup device has a transducer on one end and a jack on the other end. The jack can be plugged into a preamplifier circuit and then to a power amplifierAnonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-16792480442223318762013-12-23T01:15:00.001-08:002013-12-23T01:15:12.617-08:00Please inquire any time any nonconforming part of cell phone jammer is foundPlease inquire any time any nonconforming part of cell phone jammer is foundWang Lei Leis remarks revealed the "wireless value-added services must rely on win-win" of the mystery. As Chinas leading Internet brands, TOM Onlines focus on the young and trendy demographic, including wireless Internet services and online advertising services. Business scope covers, including SMS, MMS, WAP, wireless Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-9489149817097719862013-12-21T22:30:00.001-08:002013-12-21T22:30:34.768-08:005V Regulated Power Supply Circuit DiagramThis is a small +5V regulated power supply circuit. In that case here we used 7805 Voltage Regulator IC. 7805 is a +5 Volt regulator IC from 78xx chips family. The circuit has internal current limiting and thermal protection capacity. A 9V 2A steps down transformer is used to covert 230V to 9V from mains. Here used a bridge rectifier made by four 1N 4007 diode to convert AC-DC . 470uFAnonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-3306117435351820272013-12-20T20:30:00.001-08:002013-12-20T20:30:45.227-08:00Two Transistor AM TransmitterThere are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind the inductor as it is a readily available RF choke (eg, Jaycar Cat LF-1536). To make the circuit as small as possible, the conventional tuning capacitor has been dispensed with and fixed 220pF capacitors used instead.Circuit diagram:SimpleAnonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-4257294910048710102013-12-19T19:15:00.001-08:002013-12-19T19:15:27.906-08:00Song Music generator circuit using ic UM66This is a simple (song) music generator circuit using ic UM66. To make a musical calling-bell, door-bell, kids toys etc. we can use this funny audio/sound/music/tone generator ic UM66. The UM66 series are CMOS IC’s, they has a built in ROM to store the music. The IC operates in DC +3V. We suggest to use two dry cell (1.5V X 2) for +3V Supply. For Q1 use a TO-92 type NPN transistor like Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-53121316008616370962013-12-18T18:00:00.001-08:002013-12-18T18:00:52.964-08:00Easy Loudspeaker Circuit For TelephoneThis below circuit is a easy hands-free telephone receiver system. This doesn’t have dialing circuit so, it’s not a total phone replacement circuit, but it’s just only a loudspeaker system (i.e, phone receiver,not dialer). This is a easy circuit with all parts easily available, and without any complex I.C. It is made of just capacitors, diodes, resistors, and transistors. This circuit Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-10186164693248588562013-12-17T15:30:00.001-08:002013-12-17T15:30:39.763-08:00Build a Power supply Protection Circuit DiagramWhy Build a Power supply Protection Circuit Diagram. When using a regulated supply to reduce a supply voltage there is always the danger of component failure in the supply and consequent damage to the equipment. A fuse will protect when excess current is drawn, but might be too slow to cope with over voltage conditions. The values shown are for a 12 V supply being dropped to 5 V. Power supply Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-79875525563738477592013-10-09T10:30:00.001-07:002013-10-09T10:30:05.289-07:00Hi Fi Headphone AmplifierContributed by Richard Crowley (Additional Notes by Rod Elliott This design for a headphone amplifier arose after the purchase of commercial equipment with separate pre and power amplifiers without a headphone output. It is based on designs for a headphone amplifier by John Linsley-Hood, and an active volume control, using a linear pot, by Doug Self (the "pot" circuit was originally designed by Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-2046403504412831182013-10-08T09:15:00.001-07:002013-10-08T09:15:11.452-07:00AUDIO SCHEMATIC AND ROUTING ELECTRONIC DIAGRAMAUDIO SCHEMATIC AND ROUTING ELECTRONIC DIAGRAMIt shows the connection and wiring between each parts and component of audio system of the vehicle such as the alternator, ignition switch, antenna meter, tail, audio, front speaker, rear speaker, tweeter speaker, and many more.Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-67425744139180875512013-10-07T06:45:00.001-07:002013-10-07T06:45:11.351-07:00Crowbar Speaker ProtectionCrowbar circuits are so-called because their operation is the equivalent of dropping a crowbar (large steel digging implement) across the terminals. It is only ever used as a last resort, and can only be used where the attached circuit is properly fused or incorporates other protective measures. A crowbar circuit is potentially destructive - if the circuitry only has a minor fault, it will be a Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-56859166133381806512013-10-06T05:15:00.001-07:002013-10-06T05:15:06.013-07:00METAL DETECTOR USING BEAT FREQUENCY OSCILLATOR ELECTRONIC DIAGRAMMETAL DETECTOR USING BEAT FREQUENCY OSCILLATOR ELECTRONIC DIAGRAMThe NAND gates use CMOS 4011 chip, a low power component that is suitable for this battery-operated circuit. You can see that this chip is supplied by a 5V voltage coming from an LM7805L regulator. You might wonder what the purpose of this regulation is, since the power supply come from a 9V battery and the CMOS gates can Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-19741876213359818392013-10-05T04:00:00.001-07:002013-10-05T04:00:09.868-07:00Baud Rate GeneratorIn this article, an RC oscillator is used as a baud rate generator. If you can calibrate the frequency of such a circuit sufficiently accurately (within a few percent) using a frequency meter, it will work very well. However, it may well drift a bit after some time, and then…. Consequently, here we present a small crystal-controlled oscillator. If you start with a crystal frequency of 2.45765 MHzAnonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-89331797123826413602013-10-04T02:15:00.001-07:002013-10-04T02:15:11.561-07:00High Side Current MeasurementsIt’s always a bit difficult to measure the current in the positive lead of a power supply, such as a battery charger. Fortunately, special ICs have been developed for this purpose in the last few years, such as the Burr-Brown INA138 and INA168. These ICs have special internal circuitry that allows their inputs to be connected directly to either end of a shunt resistor in the lead where the Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-54627643189309993562013-10-03T01:30:00.001-07:002013-10-03T01:30:06.166-07:00Simple Remote Control TesterNearly always when a remote control doesn’t work, the underlying problem is elementary: the unit does not emit light. The cause may be dry solder joints, defective LEDs etc., but also a flat battery (perhaps due to stuck key). The human eye is unable to perceive infra-red light. By contrast, an ordinary photo transistor like the BP103 has no problems working in the infrared spectrum, so in the Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-59767640077387077152013-10-01T22:45:00.001-07:002013-10-01T22:45:39.807-07:00Egg Timer CircuitThis is a simple  egg timer circuit , which is both simple and functional, shows once again that it is not essential to use a microcontroller for everything these days. The circuit consists of only two ICs from the standard 4000 logic family, a multi-position rotary switch and a few individual components. The combination of a 4040 oscillator/counter and a 4017 decimal counter is certainly Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-67156564234313135322013-09-30T21:45:00.001-07:002013-09-30T21:45:07.217-07:003 Input Video MUX CableThe circuit diagram shows a low-cost 3-input video MUX cable driver. In this circuit, the amplifier is loaded by the sum of RF and RG of each disabled amplifier. Resistor values have been chosen to keep the total back termination at 75 Ω while maintaining a gain of 1 at the 75-Ω load. The switching time between any two channels is approximately 32 ns when both enable pins are driven. When Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-28945014144978842362013-09-29T19:15:00.001-07:002013-09-29T19:15:04.284-07:00Two LED Voltage IndicatorThere are many applications where the accuracy of a digital or analogue (bar graph) is not required but something better than a simple low/high indicator is desirable. A battery charge level indicator in a car is a good example. This simple circuit requiring only two LEDs (preferably one with a green and red LED in a single package), a cheap CMOS IC type 4093 and a few resistors should ful-fil Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0tag:blogger.com,1999:blog-5728965942824962969.post-35528624844484095992013-09-28T17:15:00.001-07:002013-09-28T17:15:08.855-07:00Courtesy Light ExtenderIn essence, this circuit is a 15 to 20-second courtesy light extender for cars. It is activated in the usual way by opening a door but it also samples the negative lock/unlock signals from a car alarm or central locking and does two more things. First, when an unlock signal is received, it turns on the courtesy light for 15-20 seconds before you open the door. Second, when a lock signal is Anonymoushttp://www.blogger.com/profile/01843475779684234141noreply@blogger.com0