Circuits & Schematics: metal detector - 10
Search for: "metal detector"
- .. may not be significant for high-voltage multicell batteries. But for one-cell Li+ batteries or two- to four-cell nickel-metal-hydride (NiMH) batteries, the power loss and diode drop across the blocking diode are considerable. An ...09-09-2010
- .. driving long brass threaded shafts.These run through a nut which is attached to the gate via a steel tube, bolt and two metal brackets. The motors are hinged, and when they are run they either push the nut away from them or pull it ...16-10-2010
- .. to a simple pulley mechanism, to move the curtains. I first started this circuit over 20 years ago and apart from now using metal gears, very little has changed. Click to enlarge Notes Automatic Operation The circuit can be broken down into ...20-10-2010
- .. with each other. Then one day I forgot the gears were engaged and manually closed the curtains ruining the gears! I now use metal gears though plastic gears are perfectly suitable for this project. This mechanism is suitable for the plastic ...20-10-2010
- David Johnson This circuit demands a control current that is 100 times smaller than that needed by a typical optically isolated solid state relays. It is ideal for battery-powered systems. Using a combination of a high current TRIAC and a very ...28-10-2010
- .. that is required, but I suspect that the end cap may still not be quite strong enough, so I might have to replace it with a metal equivalent further down the track. The step up converter built from a kit. It starts from just four volts snd ...01-11-2010
- .. the output from ringing/oscillating. Parts List IC1 LP2951 voltage regulator D1 1N4002 General purpose diode R1 2M 1% metal-film R2 806K 1% metal-film P1 50K potentiometer C1 0.1uF polyester C2 2.2uF/16V electrolytic C3 330pF ceramic ...11-12-2010
- .. low to signal object detection. Sensor pad size is the major factor determining the circuit’s sensing range. For a metal disk, the circuit detects an object’s approach at a distance of about the disk diameter. Response time ...11-04-2011
- .. from the source fed through a large 100-MΩ, 15-kV resistor (R1), a precision 1-kΩ (1% tolerance) metal-film resistor (R2), and a 1-nF charging capacitor (C1). Capacitor C1 is charged by energy from the voltage ...08-08-2011
- .. provides a visual feedback to indicate that the transmitter is working. The circuit can be enclosed in a small plastic or metal box and requires just a 9V transistor battery for operation. Diode D 1 is a basic Everlight PD333-3C/H0/L2 or ...19-09-2011
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