Wednesday, March 28, 2012 by skemarangkaian
|Rangkaian Pendeteksi Logam|
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