Circuits & Schematics: metal detector - 9
Search for: "metal detector"
- .. capacitor helps the batteries cope with the high demand current (as high as 1.5a in some cases). I’m using nickle metal hydride batteries, which have a rather low internal resistance they’re designed for high demand ...23-11-2009
- .. U4 L78M10 #511-L78M10CV D1-D3 1N5817 #583-1N5817 D4 5 volt LED #512-MR5460 Resistors (all fixed resistors 1/4 watt metal film). R1 100K R3 5K pot #72-T93YA-5K For a 1 inHg range use 10K pot #72-T93YA-10K R4 2K pot #72-T93YA-2K R5 ...12-01-2010
- .. form a transient suppresser. The key switch acts as the Set/Unset and Reset switch. For good security this should be the metal type with a key. Operation: At switch on, C6 will charge via R11, this acts as the exit delay and is set to ...17-03-2010
- .. connected together. The entire circuit can be laid out on a piece of prototype board, and mounted in a suitable plastic or metal box. No special precautions are needed, other than ensuring that polarised components (transistor, op-amp, and ...26-03-2010
- .. and 5mm red LED can be used, provided they are in close contact and enclosed in a light-proof small box. I used the metal screen of a small IF transformer for AM transistor radios sealed with black insulating tape. The 10K trimmer ...30-03-2010
- This amplifier circuit is used to amplify TV signals in UHF range. It uses a low-noise transistor and gives 10 to 15 dB amplification in the frequency range from 400 MHz to 850 MHz. The transistor must be shielded from the input components and in ...09-04-2010
- .. and amplifier part. The corrector part contains NE5532 integrated circuit with extreme small noise. Resistors are 1% metal film 0,6W types, condenser's of this corrector section must be 5% or better, 63 - 100 V types. Corrector ...14-04-2010
- .. useful range. Not a problem on my bot, but may be on yours. Higher internal resistance than NiCads, but better than Nickel Metal Halide. LiIon is not recommended for applications requiring very high instantaneous current such as power ...23-06-2010
- .. 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, ...14-07-2010
- .. 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
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