Dimmer for neon tubes

A neon tube cannot be dimmed as easily as an incandescent lamp because the tube can start only at a voltage much higher than the mains, after which it will remain lit at the mains voltage. The level of both the starting voltage and the working voltage depends on the temperature of the tube. Normally,[…]

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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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4-digit counter module

This compact four-digit digital counter is suitable for any application, such as clocks, frequency meters, digital voltmeter, tachometers, stop-watches, scoreboards, etc. The counter module provides a reset switch and a carry output signal. The maximum count of the module depends on which version of the IC used: • the MM74C926 pulls its carry output high when[…]

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Super starter for cars

The super starter makes it possible to start cars with ageing batteries and obsolescent (coil-based) Ignition systems, particularly during cold or damp weather. During starting, the voltage of an ageing (and possibly cold) battery will be insufficient for the coil to generate a tension high enough to create a strong spark across the spark plugs. The circuit[…]

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Horse simulator

Here is a way of faithfully reproducing the movement of a horse: with a rotary switch that enables selection of step, trot, gallop to the, gallop to the left and background. The manner in which the horse puts down its hoofs is indicated clearly by LEDs. The simulator forms, therefore, a versatile demonstration model for[…]

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