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Rangkaian Pendeteksi Logam

Rabu, 28 Maret 2012 by skemarangkaian

Rangkaian Pendeteksi Logam
This simple metal detector requires alone a scattering of apparatus and an evening’s work. Congenital about a cmos4011 IC, is actual able-bodied and versatile. The 250 kHz advertence oscillator is congenital with two gates (U1/1 and U1/2), C1, R1 and P1. The chase oscillator uses alone one aboideau (U1/3), two capacitors and the chase coil. The outputs of the two oscillators are fed to the fourth aboideau acting as a mixer and filtered with C4.

After assembly, affix the headphones and boring about-face P1. The angle will get lower until it disappears. Continuing to circle P1 in the aforementioned administration will account the angle to acceleration again. The point at witch the angle is the everyman and disappears is alleged “zero beat”. If you can not get this aught exhausted abundance for the absolute about-face of P1 you may accept to baddest altered ethics for C1.
Turn P1 abutting to the aught exhausted position, again move the chase braid abreast a brownish object. The accent should change, depending on the admeasurement and ambit of the metal.
Note that this simple detector’s achievement is not commensurable to added avant-garde bartering products. It will alone ascertain about ample brownish altar at a abbreviate distance. Coins and added baby altar will be abundant harder to find!
Here the Beat-frequency Oscillator Simple Metal Detector Schematic Part List :
  • U1: CD4011 (Quad 2-input NAND Gate)
  • U2: LM78L05 (5V Regulator IC)
  • R1: 2.2k 5% resistor
  • R3: 330k 5% resistor
  • R4: 270k 5% resistor
  • R5: 1k 5% resistor
  • C1: 390pF NPO capacitor
  • C2, C3: 10nF
  • C4: 100nF
  • C5: 100uF/16V electrolytic
  • C6: 220uF/16V electrolytic
  • C7: 100nF ceramic
  • P1: 4.7k lin. potentiometer
  • L1: 22cm diameter, 14 turns, AWG 26
  • K1: SPDT toggle switch
  • J1: Headphone jack 1/4 or 1/8 inch

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Rangkaian Pendeteksi Logam

Selasa, 13 Maret 2012 by skemarangkaian

Pendeteksi Metal
Skema Rangkaian Pendeteksi Metal
This is a metal detector circuit used IC CS209A . A 100uH coil is used to sense the presence of metal. The IC CS209A has a built in oscillator circuit and the coil L1 forms a part of its external LC circuit which determines the frequency of oscillation. The inductance of the coil change in the presence of metals and the resultant change in oscillation is demodulated to create an alarm. The LED gives a visual indication too. This circuit can sense metals up to a distance of few inches.



Note:
The switch S1 can be a slide type ON/OFF switch.
The POT R1 can be used to adjust the sensitivity of the circuit.



IC CS209A Description

The CS209A is a bipolar monolithic integrated circuit for use in metal detection (Pendeteksi Metal)/ proximity sensing applications. The IC (see block diagram) contains two on-chip current regulators, oscillator and low-level feedback circuitry, peak detection/demodulation circuit, a comparator and two complementary output stages.

The oscillator, along with an external LC network, provides controlled oscillations
where amplitude is highly dependent on the Q of the LC tank. During low Q conditions, a variable low-level feedback circuit provides drive to maintain oscillation. The peak demodulator senses the negative portion of the oscillator envelop and provides a demodulated waveform as input to the comparator. The comparator sets the states of the complementary outputs by comparing the input from the demodulator to an internal reference. External loads are required for the output pins. A transient suppression circuit is included to absorb negative transients


Lay out IC CS209A and diagram blog IC CS209A


Absolute Maximum Ratings
Supply Voltage ................................................................................................24V
Power Dissipation (TA = 125¡C).............................................................200mW
Storage Temperature Range ....................................................Ð55¡C to +165¡C
Junction Temperature...............................................................Ð40¡C to +150¡C
Electrostatic Discharge (except TANK pin) ................................................2kV
Lead Temperature Soldering
Wave Solder(through hole styles only) ...........10 sec. max, 260¡C peak
Reflow (SMD styles only) ...........60 sec. max above 183¡C, 230¡C peak

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