Metal Detector
A single chip metal detecor with a range of a few inches. This is useful for decting nails or screws in walls and floors, 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 100uH choke. The IC has an integral oscillatorm the choke forms part of an external LC circuit, its inductance being altered by the proximity of metal objects. It is the change in oscillation that is amplified and demodulated. Led 1 will light and the buzzer will sound when the choke change sinductance. Set up is easy, VR1 is adjusted with the cjoke away from any metal source so that the LED lights and buzzer sounds. The control is backed off so that the LED goes out and buzzer stops. Now when the choke comes into contact with any metal object that alters its inductance, LED 1 and the buzzer will activate.
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Dark Activated Switch
about 4 months ago - 24 comments
This circuit will activate a relay when light falls to a preset level. Light level can be adjusted with VR1 and the relay contacts may be used to operate an external light or buzzer. Notes: The light sensor used is the ORP12 photocell. In bright light the resistance of the ORP12 can be as low…
Frost Alarm activated switch
about 4 months ago - 34 comments
A simple thermistor triggered switch with adjustable threshold. It triggers with cold temperatures so may be used as a frost alarm or cold temperature switch. Circuit Notes The thermistor used has a resistance of 15k at 25°C and 45k at 0° Celsius. A suitable bead type thermistor can be found in the Maplin catalogue. The…
ELECTRONIC SECURITY SYSTEM
about 1 year ago - 1,724 comments
The system comprises a monitoring system and several sensing zones. Each sensing zone is provided with a closed-loop switch known as sense switch. Sense switches are fixed on the doors of premises under security and connected to the monitoring system.
Gas Leakage Alarm
about 1 year ago - 8 comments
Here is a circuit that detects the leakage of LPG gas and alerts the user through audio-visual indications. LPG gas is supplied in pressurised steel cylinders. As this gas is heavier than air, when it leaks from a cylinder it flows along floor and tends to settle in low spots such as a basement.…
Dew-Point Sensor
about 1 year ago - 314 comments
Dew-point sensors are widely used in sensitive electronic equipment like cameras and copiers etc, to protect them from moisture failure by fast detection of dew. You can easily build one yourself using the readily-available dew sensor element as described here. Alternatively, you can use the tiny dew sensor element of your old VCR or video…
Light Operated Relay
about 1 year ago - 3,058 comments
This Light Sensitive Circuit can operate a Relay to switch on Lamps or any AC loads when it senses darkness. It is ideal to use as switch less Night lamps driver. LDR is used as the light sensor. Its resistance is low about 100 ohms in bright light but increases to 10 meg or more…
Motion Sensor for Security Light
about 1 year ago - 2,280 comments
Here is a system based on PIR motion detector module BS1600 (or BS1700) that can be used for security or corridor lighting in power saving mode. The 12V DC power supply required for the motion detector and the relay driver is derived from 230V, 50Hz mains using a transformerless circuit as shown in Fig. 1. Circuit…
Mobile bug
about 1 year ago - 2,882 comments
This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of oneand- a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying and unauthorised video…
Thermometer – Nokia 3310 Lcd
about 2 years ago - 1,518 comments
Use parts of an old or broken mobile phone? Why not! One useable part of a mobile phone is its LCD, which can be used in many applications where we need data visually presented. we can use it as digital Thermometer Nokia 3310 has a LCD with 84*48 dots, that isn’t that hard to get…
Water temperature controller
about 2 years ago - 2,003 comments
The circuit presented here controls the temperature of water as well as indicates it on an LED bargraph. When the temperature of water is 0o C, none of the bargraph display LEDs glows. But as the temperature starts increasing above approximately 30o C, LEDs from LED1 through LED8 of the bargraph start glowing one after…
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