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Bat Detector Circuit 2008-08-12 08:15:29 This Bat DetectorCircuit
is authored by Chris Eve. Basic tests with a variety of salvaged electret microphones all showed good response to 50kHz and beyond, the smaller the unit the better the response. My tests indicate that a small electret microphone has at least some response to 100kHz and that this response is reasonably "flat" to at least 50kHz.
The microphone I use is approximately 6mm i
Lie Detector Circuit 2008-08-12 08:06:58 This electronic detector circuit is for detecting a Lie. The lie detector circuit diagram consists of three transistors, a capacitor, two lights or LEDs, five resistors, and a variable resistor.
This circuit is based on the fact that a person's skin resistance changes when they sweat (sweating because they're lying). Dry skin has a resistance of about 1 million ohms, whereas the resistance of moi Read more:Circuit
, Detector
, Lie Detector
UltraSonic Radar 2008-08-12 01:23:36 This is a ultrasonic radar project with many practical applications in security and alarm systems for homes, shops and cars. It consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered by the circuit the circuit’s fine balance is disturbed and the alarm is triggered. The circuit is very sensitive and can be adjusted t Read more:Radar
Lie Detector Circuit #2 2008-08-11 17:45:53 This lie detector circuit can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring skin resistance, which goes down when you lie.
Parts List:
R1 - 33K 1/4W Resistor
R2 - 5K Pot
R3 - 1.5K 1/4W Resistor
C1 - 1uF 16V Electrolytic Cap Read more:Circuit
, Detector
, Lie Detector
Basic CdS Photocell Detector 2008-08-11 17:14:26 This is a Basic
Cadmium Sulfide (Cds) Photocell Detector
circuit. In this circuit, when the light falling on the photocell (PC 1) is blocked, its resistance will increase and the voltage across PC 1 will rise. When the voltage rises above 1/2 of the supply voltage the output of the comparator will turn ON and the LED will be lit.
Due to wide variations in CdS photocells it is usually best to ins
Infrared Light Photo-Detector Circuit 2008-08-11 17:13:13 This is a basic infrared light photo detector circuit. In this circuit the light falling on the phototransistor will be from an Infrared
Light Emitting Diode (IrLED) but otherwise it is the same as the phototransistor circuit shown above.
When the light falling on the phototransistor (Q1) is blocked, its conductance will decrease and the voltage across Q1 will rise. When the voltage rises above 1 Read more:Circuit
, Detector
, Photo
Basic Phototransistor Detector 2008-08-11 17:00:17 This is a Phototransistor Detector
circuit. In this circuit, when the light falling on the phototransistor (Q1) is blocked, its conductance will decrease and the voltage across Q1 will rise. When the voltage rises above 1/2 of the supply voltage the output of the comparator will turn ON and the LED will be lit.
The only critical part of this circuit is the value of resistor R1 which in most case Read more:Basic
Audio Detector Circuit 2008-08-11 16:52:34 This electronic detector circuit is to do audio detection. The circuit is for detecting one of those 3.6khz (approx) beepers from Radio Shack. The component used is a single IC (LM324 quad op amp) and a handful of parts.
Notes:
The capacitor and resistor on the output of the peak detector are selected to give a reasonable decay time. I.e. so a single pulse doesn't stretch out and be miss- Read more:Audio
, Circuit
, Detector
Oxygen Sensor Simulator 2008-08-11 16:37:25 This circuit is an oxygen sensor for car. The oxygen sensor simulator as built on a protoboard. Note the cigarette lighter plug used for power source. The adjustment knob is at the left, and the switch is on the right. The red indicator LED is in the middle. Only use red, because the voltage drop of the LED is part of the circuit!
The schematic diagram for the simulator. Closing the switch engage Read more:Oxygen
, Sensor
, Simulator
Infineon SP35 Tire Pressure Sensor 2008-08-11 14:01:34 The SP35 is a highly integrated device which performs all necessary functions of a TPM module in the wheel for high-volume applications. The device contains the sensing element, the microcontroller, the LF receiver and the transmitter in one package.
The Sensor
design is based upon Infineon
’s patented bulk micro-machined sensing technology which allows highly reliable measurements in harsh envi Read more:Pressure
Tire Pressure Monitoring (TPM) System from Microchip 2008-08-11 13:48:28 This document explains a typical tire pressure monitoring (TPM) system specifically intended for automotive use. It serves as a reference to design a real-world system based on various Microchip
products. A TPM system primarily monitors the internal temperature and pressure of an automobile's tire. There is a variety of system approaches to follow; although this one is a rather comprehensive auto- Read more:Pressure
, System
Privacy Policy 2008-08-11 12:44:02 Privacy Policy
for Detector and Sensor Blog
If you require any more information or have any questions about our privacy policy, please feel free to contact us by email at detsor@telkom.net.
At Detector and Sensor Blog, the privacy of our visitors is of extreme importance to us. This privacy policy document outlines the types of personal information is received and collected by Detector and Senso Read more:Privacy
, Privacy Policy
Xenon Lamp Flash Detector 2008-09-26 15:31:42 This circuit is xenon lamp flash detector. It has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp. When connected to a flip/flop it can serve as an on on/off controller.
More
Read more:Detector
, Flash
Infrared Gate Sensor 2008-09-26 15:31:01 Circuit is Infrared
gate sensor. It's an infrared gate with two sensors planned to use in the wall in the way behind a door. It can be applied in a toilet to keep track of that someone is inside exceeding a certain amount of time. After that time elapsed, the circuit triggers the digital output wich can turn on a ventillator. The time period the output is turned on can be separately controlled by Read more:Sensor
Biscuit Tin Alarm 2008-09-23 13:07:54 Someone is stealing the biscuits! Your mission, should you choose to accept it, is to design a circuit which will give an audible alarm as soon as the biscuit tin is opened. The circuit provides a delay of around 10 seconds when the power supply is first connected during which the circuit can be placed in the tin. After this, if the LDR is exposed to light the alarm is triggered and remains ON, pr Read more:Biscuit
PIC Controlled Alarm Clock 2008-11-18 02:05:37 Here's a alarm clock circuit based on PIC Controlled. Two circuit boards put together a simple PIC based design comprising of two interlinked vero-board cards. The larger of the two circuit boards holds the 5V power regulator, the display processor (a PIC 16F74), the real time clock (Dallas DS1307), 3V backup battery and buzzer. See the schematic below for detail.
The PIC board looked like this Read more:Alarm Clock
, Clock
Simple Home Alarm Circuit 2008-11-15 00:12:38 Here's a simple home alarm circuit is for those who are eager to know the concept of home security system. It consists of three 555 timers gets the input from a contact that could be connected to a motion detector or any momentary contact that monitors a certain process. Once the contact is momentarily closed, the first timer which is configured as a monostable output will output a high pulse with Read more:Circuit
, Simple
Automatic Intruder Burglar Alarm 2008-11-13 20:39:58 This is a burglar alarm circuit written by Ron J. 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 switches - foil tape - and PIRs. But it can be Easily Modified to accept normally-open triggering devices - such as pressure mats.
Hot It works Read more:Burglar
, Intruder
Car Parking Aid Sensor 2008-11-22 05:16:07 This Sensor
circuit was designed as an aid in parking the car near the garage wall when backing up. LED D7 illuminates when bumper-wall distance is about 20 cm., D7+D6 illuminate at about 10 cm. and D7+D6+D5 at about 6 cm. In this manner you are alerted when approaching too close to the wall.
All distances of the sensor mentioned before can vary in this operation , depending on infra-red transmi Read more:Parking
Smoke Detector for Fire Alarm 2008-11-20 10:44:08 This is a simple fire alarm circuit based on a LDR and lamp pair for sensing the fire. It uses a very simple approach to detecting smoke in the air. The alarm works by sensing the smoke produced during fire.The circuit produces an audible alarm when the fire breaks out with smoke.
This probably isn't an ideal approach given that ambient light levels are likely to cause false alarms, however it is Read more:Detector
, Smoke
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