Showing posts with label metal. Show all posts
Showing posts with label metal. Show all posts
Sunday, October 6, 2013
METAL DETECTOR USING BEAT FREQUENCY OSCILLATOR ELECTRONIC DIAGRAM
METAL DETECTOR USING BEAT FREQUENCY OSCILLATOR ELECTRONIC DIAGRAM
The NAND gates use CMOS 4011 chip, a low power component that is suitable for this battery-operated circuit. You can see that this chip is supplied by a 5V voltage coming from an LM7805L regulator. You might wonder what the purpose of this regulation is, since the power supply come from a 9V battery and the CMOS gates can handle the voltage of 3-15 Volt. The main purpose of the regulator is to keep a constant voltage source for the reference oscillator frequency stability, since the frequency is affected by the power supply voltage variation as the battery voltage drops in the long time of usage.
This circuit uses parts as follows :
- U1: CD4011
- U2: LM389
- U3: 78L05
- R1: 2.2k 5%
- P2: 4.7k lin.
- R3: 330k 5%
- R4: 270k 5%
- R5: 1k 5%
- C1: 390pF (NPO)
- C2,C3,C4: 10nF
- C5: 10uF 16v electrolytic
- C6,C8: 220 uF 16v electrolytic
- C7: 100uf 16v electrolytic
- C9: 100nF ceramic
- P1: 4.7k log
- L1: 22cm in diameter with 14 turns AWG 26
- K1: SPDT toggle switch
- J1= Headphone jack 1/4 or 1/8 inch
- Other parts: 9v battery connector, speaker or headphones
Thursday, July 11, 2013
Coil Coupled Operation Metal Detector
A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector.
Coil Coupled Operation Metal Detector Circuit Diagram
Notes:
The metal detector shown here may well represent a new genre. At any rate, after some exposure, it is regarded as such by those who have seen it. It is based on a standard transformer coupled oscillator (TCO) hence the name Coil Coupled Operation (CCO) Metal Detector. Although requiring a BFO (in this case provided by a Medium Wave radio), it differs from a typical BFO detector in that its performance far outstrips that of BFO. Also, unlike BFO, it is dependent on the balance of two coils to boost sensitivity. It also differs from IB, in that its Rx section is an active, rather than passive, component of the oscillator. Further, unlike IB, the design does not require critical placement of the coils. As with both BFO and IB, the design provides discrimination. Experiments with different embodiments of the idea have shown that it has the potential to match the best of IB. Happy hunting!
Coil Coupled Operation Metal Detector Circuit Diagram
The metal detector shown here may well represent a new genre. At any rate, after some exposure, it is regarded as such by those who have seen it. It is based on a standard transformer coupled oscillator (TCO) hence the name Coil Coupled Operation (CCO) Metal Detector. Although requiring a BFO (in this case provided by a Medium Wave radio), it differs from a typical BFO detector in that its performance far outstrips that of BFO. Also, unlike BFO, it is dependent on the balance of two coils to boost sensitivity. It also differs from IB, in that its Rx section is an active, rather than passive, component of the oscillator. Further, unlike IB, the design does not require critical placement of the coils. As with both BFO and IB, the design provides discrimination. Experiments with different embodiments of the idea have shown that it has the potential to match the best of IB. Happy hunting!
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