Circuits & Schematics: detector

1. Simple Lie Detector
   Circuits Medicine Security
   .. a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is ...
   08-12-2007

2. Inexpensive Peak Detector Requires Few Components
   Circuits Analogue Design Texas Instruments TLC372 LM358
   .. no rectifier diodes, the positive peak-detector circuits in figures 1 and 4 exploit the open-drain output of a Texas Instruments TLC372 fast comparator, ...
   25-07-2020

3. Audio Detector
   Circuits Audio
   This circuit is for detecting any audio signal with justable noise offset. It could be used to generate a radio mute signal eg. from a PDA. The circuit is consisting of: Input impedance Signal amplifier Rectifier Justable comparator (Noise offset). ...
   31-03-2008
4. Cheap Sensitive Radiation Detector
   Circuits Security Measurement
   .. project started out as a gag project, a Nuclear War Detector. The idea was to make a device that would flash a little red light if a nuclear attack were underway or ...
   23-04-2008
5. How to build a Geiger counter (radiation detector) with a USB capable microcontroler to connect a PC
   Circuits Security Measurement Microcontrollers Usage
   The Geiger counter is a pretty simple device to detect radiations. Many forms of radiations from radio elements (alpha, beta, gamma) can be detected but it is more sensitive to beta and gamma radiations. The Geiger-Muller tube is a simple device, ...
   27-09-2008
6. Rain Detector
   Circuits Automation Domestic Measurement
   .. rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and ...
   05-11-2008
7. Cellular Phone calling Detector
   Circuits Domestic Cellular
   Flashes a LED when detecting an incoming call Powered by one 1.5V cell Circuit diagram : Parts: R1 100K 1/4W Resistor R2 3K9 1/4W Resistor R3 1M 1/4W Resistor C1, C2 100nF 63V Polyester Capacitors C3 220µF 25V Electrolytic Capacitor D1 LED ...
   06-07-2009
8. Metal Detector
   Circuits Domestic CS209A
   .. or for locating buried mains cable. The heart of the circuit is a single IC the CS209A made by Cherry Semiconductor. The detector, is a single 100 uH choke. The IC has an integral oscillatorm the choke forms part of an external LC ...
   27-10-2007
9. IR Detector
   Circuits Domestic
   An IR signal is seen by a reverse biased IR diode which produced an electrical signal according to the light intensity. This signal is then amplified trough a transistor and used to power an ordinary LED. This means that the LED will light up when ...
   13-11-2007
10. Short Range Hand Wave Detector
    Circuits Domestic LMC7211 LM358
    .. I would not recommend its use in direct sunlight. Two small PIN photodiodes positioned about one inch apart form a shadow detector. With no shadow cast on the devices, both devices produce nearly identical current levels. The current is ...
    31-03-2009

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