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High Side Current Monitor
Monitoring current on inductive loads is a common task. It`s easier to do on the low side of a driving circuit, because a simple resistor can be used with an op-amp on the ground rail. The high side often demands that an expensive current sensing transformer or Hall effect sensor be used. The circuit below is desirable because it uses a simple...
Inductive Proximity Sensors
The inductive sensor is a simple enough device at the fundamental level. It is simply a coil of wire with a current passing through it. It completely ignores most objects which pass near this coil. However, when a metallic object passes near it, it acts as a core material in the inductive loop which increases its inductance significantly. Most non
Inductive Electronic Oscillator Circuit
The oscillator circuits presented on this page are from expired or non-maintained U. S. Patents. All circuits are presented in "Electronic Workbench 5. 12" or "Multisim 7 circuit simulation formats". A note on spice simulation of electronic oscillator circuits. All of the oscillator circuits presented on this web page have been simulated using...
metal detector with MC AT90S2313
It's a simple metal detector design that has the quite good characteristics. the principle of operation which one differs from the classic schemes (BFO, transmit-receive known as "two-boxes" metal detector, inductive). The dynamic mode is used to find targets in interference environment. There is known from theory of signal filtration that if...
Current Loop Sensor Interface
This is a very simple circuit to interface a current loop sensor to an input which is designed for a voltage, such as that from a standard potentiometer. This page is technical so that interested persons can build the circuit themselves, but 4QD can also supply the interface on a 'postage stamp' sized (22mm x 27mm) board as shown in the first...