tag:blogger.com,1999:blog-41862212617094980512024-02-20T08:21:23.910-08:00diagram circuitAnonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comBlogger146125tag:blogger.com,1999:blog-4186221261709498051.post-74983242480067109952014-01-11T02:30:00.001-08:002014-01-11T02:30:27.813-08:00Cheap Bicycle Alarm SchematicsThe author wanted a very cheap and simple alarm for some of his possessions, such as his electrically assisted bicycle. This alarm is based on a cheap window alarm, which has a time-switch added to it with a 1-minute time-out. The output pulse of the 555 replaces the reed switch in the window alarm. The 555 is triggered by a sensor mounted near the front wheel, in combination with a Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-25869092671230579842014-01-10T15:30:00.001-08:002014-01-10T15:30:04.543-08:00Long Range Direct Conversion Receiver Using the circuit of direct-conversion receiver described here, one can listen to amateur radio QSO signals in CW as well as in SSB mode in the 40-metre band. The circuit makes use of three n-channel FETs (BFW10). The first FET (T1) performs the function of ant./RF amplifier-cum-product detector, while the second and third FETs (T2 and T3) together form a VFOAnonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-10417440748337587232014-01-10T15:15:00.001-08:002014-01-10T15:15:23.167-08:0030V Variable Power Supply Using LM317This 30v variable power supply circuit is based on LM317 voltage regulator circuit . This LM317 30v variable power supply circuit can deliver high current (around 5 amps) and variable output voltage between 1.2 volts, up to 30 volts. The led D3 mounted on pin 6 at lm301 lights in constant current mode .Circuit diagram Current limit can be adjusted using R2 potentiometer and the Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-39150356106629650422013-12-27T10:00:00.001-08:002013-12-27T10:00:25.214-08:00Intelligent 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/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-713865729370712172013-12-25T09:45:00.001-08:002013-12-25T09:45:10.016-08:00Simple Microprocessor power supply watchdog circuit DiagramThe Simple Microprocessor power supply watchdog circuit Diagram monitors the input to the microprocessor 5 V regulated supply for voltage drops and initiates a reset sequence before supply regulation is lost. In operation, the resistor capacitor combination Rs and Cj form a short time constant smoothing network for the output of the fullwave bridge rectifier. An approximately triangular, Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-64113784353418578172013-12-23T09:30:00.001-08:002013-12-23T09:30:14.004-08:00Build a Remotely Adjustable Solid State High voltage Supply Circuit DiagramHow to build a remotely adjustable solid state high-voltage supply Circuit Diagram. The output voltage changes approximately linearly up to 20 KV as the input voltage is varied from 0 to 5 V. The oscillator is tuned by a 5-0 potentiometer to peak the output voltage at the frequency of maximum transformer response between 45 and 55 kHz. The feedback voltage is applied through a 100-KO Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-53474129931759993432013-12-21T08:45:00.001-08:002013-12-21T08:45:28.037-08:00Battery Powered High voltage Generator Circuit DiagramThis is the battery powered high-voltage generator circuit diagram. Output voltage great enough to jump a l-inch gap can be obtained from a 12-V power source. A 555 timer IC is connected as an stable multi vibrator that produces a narrow negative pulse at pin 3. The pulse turns Ql on for the duration of the time period. The collector of Ql is direct-coupled to tbe base of tbe power Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-70778390424772542982013-12-19T08:15:00.001-08:002013-12-19T08:15:15.071-08:00Video Tracer Circuit DiagramThis circuit was designed as an aid to installers and maintainers of video systems. It is basically a video sync separator (IC1) followed by a LED and buzzer driver (IC2, Q1 & Q2). In use, the device is connected to a video cable and if there is video present, the LED will flash at about 10Hz. If there is no video, the LED flashes briefly every couple of seconds. A buzzer can also be switchedAnonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-13281987354143503662013-12-17T09:15:00.001-08:002013-12-17T09:15:21.353-08:00ANTI BAG SNATCHING ALARM Here is a simple alarm circuit to thwart snatching of your valuables while travelling. The circuit kept in your bag or suitcase sounds a loud alarm, simulating a p attempts to snatch your bag or suitcase. This will draw the attention of other passengers and the burglar can be caught red handed.www.blogger.com In the standby mode, the circuit is locked Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-82157382769623536632013-10-08T11:00:00.001-07:002013-10-08T11:00:09.125-07:00Low Battery Indicator IHere is the circuit diagram of low battery indicator from silicon chip electronics. This simple circuit lights LED1 when the battery voltage drops below the setting set by trimpot VR1. In effect, VR1 and associated resistors bias Q1 on which holds Q2 and the LED off. When the voltage drops below the set value, Q1 turns off, allowing Q2 to turn on and light the LED. The circuit is suitable for Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-23668451774656228232013-10-06T10:45:00.001-07:002013-10-06T10:45:05.908-07:00FLASH LIGHT ELECTRONIC DIAGRAMFLASH LIGHT ELECTRONIC DIAGRAM IC NE555 works as an astable multivibrator with variation on the frequency. With this circuit, the LED blinks every half second. How long the blink time is, can be adjusted by adjusting the value of capacitor C1. Up to 18 additional LEDs can be attached to this circuit (36 LEDs total).Components :Diode D1-D2 : 5mm LEDResistor R1 : 4K7 ohmResistor R2 : 1k Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-25507494691684580752013-10-04T11:15:00.001-07:002013-10-04T11:15:08.578-07:00RIAA Phono PreamplifierSince modern sound systems usually lack inputs for record players, separate MD preamplifiers are becoming increasingly popular. They are needed not only by people who still regularly like to listen to vinyl records, but also by those who want to finally transcribe their LP collections to CD using a CD recorder. The author has built innumerable phono preamplifiers for friends and acquaintances. In Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-4670883515876588832013-10-02T10:45:00.001-07:002013-10-02T10:45:21.427-07:002 Line Intercom Cum Telephone Line Changeover CircuitThe 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 connecting the other telephone. In this simple parallel line operation, the main problem is loss of privacy besides interference from the other Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-81155417140536920122013-09-28T08:45:00.001-07:002013-09-28T08:45:10.419-07:009V HEADPHONE AMPLIFIER NE5534 ELECTRONIC DIAGRAM9V HEADPHONE AMPLIFIER NE5534 ELECTRONIC DIAGRAMI have Used it with Sennheiser 465s and achieved ear-splitting volume. The amplifier is ideal as a booster for power-conserving stereo sources Such as portable CD players and for interfacing with passive EQ networks Such as tone controls or a headphone acoustic simulator.Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-67169608985349402452013-09-26T09:30:00.001-07:002013-09-26T09:30:11.844-07:00Discrete Voltage RegulatorThe title of this article naturally raises the question of why we think that the generous selection of fully integrated voltage regulators needs to be extended with a version constructed using discrete components. In other words, what does this circuit offer that the well-known ‘three-leggers’ don’t have? To start with, we can point out that this circuit is refreshingly simple for a discrete Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-30529544117019438902013-09-24T10:00:00.001-07:002013-09-24T10:00:10.449-07:00Luxury Car Interior LightThis circuit is much more modest, but certainly still worth the effort. It provides a high quality interior light delay. This is a feature that is included as standard with most modern cars, although the version with an automatic dimmer is generally only found in the more expensive models. With this circuit it is possible to upgrade second hand and mid-range models with an interior light delay Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-41206901739522949522013-09-22T09:15:00.001-07:002013-09-22T09:15:09.083-07:00DC Control for TriacsIf a circuit is to switch a mains voltage, a relay is a simple solution in cases where switching times are long and high currents are involved. However, at lower currents, and in particular where rapid switching is required, such as in sound-to-light systems, a relay no longer fills the bill. Electrical isolation is often a requirement, which rules out driving a triac via a transistor. Here we useAnonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-17015109749069291722013-09-20T08:30:00.001-07:002013-09-20T08:30:07.673-07:001997 Chevrolet Blazer Electrical Wiring Diagram1997 Chevrolet Blazer Electrical Wiring DiagramThe Part of 1997 Chevrolet Blazer Electrical Wiring Diagram: Cruise Control System, Defogger, Rear Glass Release, Rear Wiper/Washer, Shift Interlock System, Transmission System, 6-Way Power Seat Circuit, A/C Circuit, etc. Computer Data Lines, Anti-lock Brake, Back-up Lamps Circuit, Charging Circuit, Keyless Entry, Engine Performance Circuits, WarningAnonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-32893752666353632042013-09-12T07:15:00.001-07:002013-09-12T07:15:05.743-07:00Simple FM Transmitter Circuit DiagramThis circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless microphones. If powered by a 9 volt battery and used with an antenna no longer than 12 inches, the transmitter will be within the FCC limits. The microphone is amplified by Q1. Q2, C5, and L1 form an oscillator that operates in the 80 Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-19839996248194969962013-09-10T07:30:00.001-07:002013-09-10T07:30:23.259-07:00Touch Controlled Mute Switch Circuit DiagramHere is another simple circuit to mute the volume of Audio devices through simple touch. It exploits the action of the flip-flops in the timer IC 555 to reduce the volume of the Audio amplifier. IC NE555 is designed in the toggle mode. Its lower and upper comparator inputs are connected to the touch plates which can be membrane switches or two pieces of conducting plates. The inputs of Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-3005704418756197392013-09-04T07:15:00.001-07:002013-09-04T07:15:15.509-07:00Dual Level Liquid SensorThis level liquid sensor electronic circuit diagram is based on a common Ca3410 operational amplifier IC . This level liquid sensor electronic circuit use two plates sensors ( two probes ) , one for the high level an one for low level .Dual Level Liquid Sensor Circuit DiagramIf the level of the liquid is not in the adjusted range the LED will glow . The circuit require just a CA3410 operational Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-53406695201139977552013-09-02T06:30:00.001-07:002013-09-02T06:30:06.405-07:002 Cell Lithium Ion ChargerThis circuit was build to charge a couple series Lithium cells (3.6 volts each, 1 Amp Hour capacity) installed in a portable transistor radio. The charger operates by supplying a short current pulse through a series resistor and then monitoring the battery voltage to determine if another pulse is required. The current can be adjusted by changing the series resistor or adjusting the input Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-58702361054660231302013-08-31T07:30:00.001-07:002013-08-31T07:30:12.221-07:00Simple Field Strength MeterThis Field Strength Meter is simple and also quite sensitive. It uses an ordinary digital voltmeter to measure RF signal strength up to a few hundred MHz.Simple Field Strength Meter Circuit diagram:Parts List:1 OA91 Germanium Diode1 3.3M Resistor1 100p CapacitorL1 7 turns on a 1/4 inch former (suitable for around 100MHz)Notes:The multimeter should be set to the lowest dc volts range for maximum Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-6012893128307225702013-08-15T10:30:00.001-07:002013-08-15T10:30:08.058-07:00Active band reject filter CircuitA filter with a band-reject characteristic is frequently referred to as a notch filter. A typical circuit using a µ 741 is the unity-gain configuration for this type of active filter shown. The filter response curve shown is a second-order band-reject filter with a notch frequency of 3 kHz. The resulting Q of this filter is about 23, with a notch depth of - 31 dB.Although three passive Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.comtag:blogger.com,1999:blog-4186221261709498051.post-37096827118169885492013-08-13T10:45:00.001-07:002013-08-13T10:45:07.049-07:00TV Protect Circuit Dead or DamagedTelevision set equipped with a circuit protector, then there are several possibilities that could occur if there is a problem on one of the circuits. Protect circuit horizontal part - When turned on the horizontal plane will live for a while, but then died again. At the time of death when measured on the horizontal driver indicates that no drive signal. If the power jack unplugged then try Anonymoushttp://www.blogger.com/profile/01828886287171203302noreply@blogger.com