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Category: Inside Circuits Views: 298 Rank: 1 When this car alarm circuit is activated it stays activated for 80 seconds. It has 15 seconds delay for the driver to enter and deactivate. and All timmings can be altered easilly...  The circuit uses two NE555 timers so its easy to alter the delays by changing few capacitors and/or resistrors. One 2N3906 and two 2N2222. Datasheet file1: Click here to download 2N2222.pdf datasheet. Datasheet file2: Click here to download LM555.pdf datasheet. Datasheet file3: Click here to download 2N3906.pdf datasheet.
Related circuits This RF amplifier has wide bandwidth and dynamic range. It has a gain of 10 dB, noise figure less than 5 dB, and the Carrier-Current Baby-Alert Transmitter Circuit The baby-alert transmitter is built around an LM324 quad op amp (Ul), two LMC555CM CMOS oscillator/timers (U2 and U3), and a few support components. The transmitter sends a signal on receipt of a sound at MIC1. Motorola MWA 110, 120, or 130 are wideband amplifier ICs. This wideband preamp circuit can be used in many applications. Keep the leads short when constructing the circuitry. PC board layout (shading represents copper) and parts layout. X is the feedthrough wire to the gound plane. All... An optoelectronics device is used to couple a digital (TTL) signal to another system. The photodiode in the optocoupler drives an LM311 set up to produce a TTL compatible output. Continually monitors battery voltage during use and consumes only about 250 ? A (until the end point is reached). Near the end point Trl turns off, allowing Tr2 to illuminate the LED to increase current drain further leading to a distinct turn off point. This circuit outputs a TTL-compatible - pulse whenever the signal falls within the limits set by potentiometers Use a pair of Maxim"s 5V-powered MAX231 RS-232C transmitters as drivers to obtain a 2-color LED. The transmitters require only a singleended, 5-V input to generate ± 10 V internally. Their outputs are short-circuit-proof and can supply as much as 10 mA-enough to drive most LEDs. Depending on... This detector is useful in sine wave squaring circuits and A/D converters. The positive input may either be grounded or con-output nected a nulling voltage which cancels input offsets and enables accuracy to within microvolts of ground
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Electronics Project for Students and Hobbyist. Learn by Circuit Diagram.
Electronics Project for Students and Hobbyist. Learn to make Rain Alarm using Circuit Diagram.
Electronics Project for Students and Hobbyist. Learn by Circuit Diagram.
This is touch alarm circuit.Here I have used very common Ic NE555 And common parts.Then easily you can make your circuit.You can attach this circuit for your door lock or for any other metal part.If some one touched that ...
Here is a simple fire alarm circuit simple based on LDR and a pair of lamps for the detection of fire.The alarm works by detecting the smoke produced during fire.The circuit produces an audible alarm when the fire with smoke ...
here is a simple water level alarm circuit that will produce an audible alarm when the water level reaches a preset level.The circuit can be powered of a 3V battery and is very handy to use.The circuit is based on an astable ...
9V Sensitive Touch Alarm Circuit
Make an Electronic Rain Alarm Yourself - Science Project ( Hindi / Urdu )
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