The metal detector circuit consists of detection oscillator, reference oscillator, mixer and signal display, it is shown as Figure 8-70. The detection oscillator circuit is composed of the time base oscillator ICl, inductor Ll, potentiometer RPl, diode VDl and capacitors Cl, C2. Reference oscillator (reference oscillator) circuit is composed of the time-base integrated
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circuit IC2, inductor L2, diode VD2, resistor Rl and capacitors C3, C4. Mixer is composed of the transistor V, diode VD3 and resistors R2-R4. Signal display circuit consists of integrated circuit IC3, voltage meter RC PV and peripheral components. Rl-R7 choose 1/4W or 1/8W carbon film resistors. RPl uses synthetic membranes potentiometer with switch; RP2 uses synthetic membrane potentiometer without switch or variable resistor. Cl-C5, C7 use ceramic capacitors; C6 uses the aluminum electrolytic capacitor with the voltage being greater than lOV. VDl-VD3 use 2AP9, 2APlO common germanium germanium diode or 2AK series switching diode. V uses 3DG6 or S9018 silicon NPN transistor.
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
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