Metal detector

This detector will help you find fairly large objects that consist of materials with a relatively high permeability. Also, it indicates whether the magnetic object inside the detection coil has good or bad conductive properties. Examples of materials that couple good magnetic properties to a fairly high electrical isolation are ferrites pressed from metal oxides.[…]

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General purpose timer

The timer is intended to actuate an apparatus for a predetermined period of time, for instance, an ultraviolet exposure unit or a photographic enlarger. Periods may be set between 0.1 s and 999.9 s. The periods are set with the due aid of thumbwheel switches and stored in four Type 74HCT190 counters, IC4-IC7. The setting[…]

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Triangular-signal generator

Pulse duration modulators 19%; a perfect triangular signal, that is, one that is absolutely symmetrical with straight sides. Any deviation from this results in distortion. The design is the usual rectangular-triangular oscillator. A Schmitt trigger converts a triangular wave into a rectangular one. which is used to continuously charge and discharge a capacitor via current[…]

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Digital pattern generator

Digital pattern generator: During the construction and testing of digital circuits, there is often a need for an accurately defined bit pattern. The generator described here uses an EPROM to store the bit information for the desired pattern. When switch S1 is pressed, a given pattern is generated once; seven different patterns can be generated simultaneously. The eighth[…]

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