Circuits & Schematics: metal detector - 3
Search for: "metal detector"
- .. lost in the sand. A typical sensor design consists of an inductor integrated into an oscillator, so that entry of metal into the magnetic field of the inductor changes the frequency of oscillation. Figure 1 shows a particularly ...06-09-2023
- .. P 1 , P 2 , and P 3 . The circuit steps down and converts the line voltage to a square wave using the IC 1A zero-crossing detector. The integrator block, IC 1B , then integrates the square wave to produce a triangular wave. The ...31-07-2023
- .. the backstory. Several years ago, I published a Design Idea ( Ref. 2 ) for an optically isolated ionization pulse detector amplifier. However, the reason why the circuit needed optical isolation in the first place was only ...06-07-2023
- .. greater and an output resistance of 1 kΩ or less. Construction tips To keep unwanted RF emissions out of the meter, a metal or conductive-plastic enclosure is needed. It may be necessary to put ferrite beads at all inputs and outputs ...
.. quite convenient to use toggle switches in this network, but of course, slide or rotary switches could be used. Peak detector and meter The peak detector is shown in Figure 5. Figure 5. A diagram showing the peak detector. It has ...25-05-2023 - .. Ω resistor with another value in parallel, chosen to give close to 0.1 Ω. It should not be wirewound unless metal-cased because otherwise, the inductance might introduce error at high frequencies: 100 nH is 628 mΩ at 1 ...
.. full scale, while the four current ranges are 10, 100 mA, and 1, 10 A full scale. The design incorporates a wide-band peak detector, whose sensitivity can be switched to read the peak voltage or the root mean square (RMS) voltage of a ...24-05-2023 - .. battery life. A better method involves a technique borrowed from simple field-strength meters: a tuned circuit and a diode detector. Figure 1 shows the complete circuit, which was tested for proof-of-concept at 445 MHz. This circuit ...23-05-2023
- .. R 7 limit forward currents through the LEDs. For greater sensitivity, you can replace the LEDs with high-input-impedance ac-detector circuits. The circuit's final version includes indicators that show whether all three phases carry ...03-04-2023
- .. diode charges the capacitor C1 through the Schottky diode D3; as a matter of fact, these components create an envelope detector. (This part of the circuit can also be interpreted as an S/H circuit.) The thing is, the typical direct ...30-03-2023
- .. systems, automobile alarms, biomedical monitors, sensor networks, and computer peripherals. A super-regenerative detector can also demodulate frequency-modulated signals through slope detection. Tune the detector so that the ...01-03-2023
- .. standard way of using an RTD (resistance-temperature-detector) sensor is to include it in a bridge followed by a differential amplifier. The problem is that two ...15-02-2023
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