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Search for: "metal detector"
Search results: 166   Output: 51-60   Including: detector (89); metal (85).
  1. .. the collector circuit enabling the 555 osillator to sound. An On/Off switch is provided and remember to use a non-reactive metal for the probe contacts. Gold or silver plated contacts from an old relay may be used, however a cheap ...
  2. .. whenever you want, and prevent others from being able to read it. The signal sent out by a RFID tag is easily blocked by metal. This means that placing the RFID tag inside of a Faraday cage will prevent the information from being read. ...
  3. .. the other lead to the probe is all that is necessary. The user's body forms the other connection through the beeper's metal case. When the beeper is properly adjusted it draws only 10 uA with nothing touching the probe - no power ...
  4. .. NPN transistor, you can drive as many as seven LEDs using a minimal amount of voltage and power from a single NiMH (nickel-metal-hydride) AA cell. The circuit works by creating much higher-voltage pulses than the voltage for powering the ...
  5. .. passive components will enable us to safely monitor the temperature of our coffee cup. Bundle this circuit inside a round metal container (metal helps conduct the cup's heat to the circuit) and you have a Smart Coaster. TIME: 3 hours COST: ...
  6. .. concepts. The implementation is easy. First, a few words about IC package heatsink electrical connections. Note that the metal thermal tab of IC1 is NOT connected to the thermal tab of IC2. And NEITHER is connected to the supply GND ...
  7. .. can be dramatically increased omitting LED D2 and its associated resistor R5. Use a plastic box to enclose the circuit: metal cases can severely limit electromagnetic radiation. Disclaimer: we can't claim or prove any therapeutic ...
  8. .. that important, but I recommend about a 9 cut (this will help make balancing easier later on). We may then slide the tail metal into the hole and use the 1/4 drill bit to drill and attach the tail to the square tubing. We will then want to ...
  9. .. Flange 36 x 1 Square Tubing 1/2 Bore Circular Sawblade (for hub) 5/8 x 1/2 Arbor (to attach sawblade to motor shaft) (2) Metal Straps 8 x 4 PVC Pipe 30 x 8 PVC Pipe (6 pipe works well too) A DC Permanent Magnet Motor (preferably Ametek ...
  10. .. a 3 V coin cell battery a 100 Ohm resistor (anything close to 100 will work) a momentary or push button switch. thin sheet metal plexiglass tools: hot glue gun metal shears sharpie saw soldering iron Cut out 6 squares of equal size from the ...
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