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multivibrator - flashing LEDs

multivibrator

With values \u200b\u200bshown in the schematic frequency of the alternating flashing LEDs is approximately 1 Hz. The system is susceptible to experiment: change the values \u200b\u200bof resistors and electrolytic capacitors will change the frequency - with tens of nF capacitor circuit generates a frequency acoustic. Multivibrator can control the buzzer (instead of the diode) or the loudspeaker (headphones). Instead of 10k resistor can be used photoresistor - the system will be sensitive to changing light intensity.

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Receiver Reaction


Very simple, but has a much higher sensitivity compared to previously described receivers. At a distance of tens of kilometers from the broadcasting station alone is enough ferrite antenna. Reaction system particularly suited to the short waves.

maximum sensitivity and strengthening is achieved moving the reaction coil on the ferrite rod and adjusting accordingly strengthen 4.7K potentiometer.











installation diagram:

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electric motor - cousin of "American"

quite unusual, experimental electric motor design modeled on the so-called generator. American woman.



Characteristics:

• plywood disc rotor (diameter 70 mm) from the sunken in polyester resin with three coils of 200 zw. 0.5 mm DNE,
• stator consists of two plates of sheet iron with a thickness of 1 mm, in which four magnets are attached apron,
• 3.sekcyjny typical commutator, brush with a brass plaque of 0.5 mm
  
• bearings - brass socket radio systems .

Design Notes:

• Location magnets (determined experimentally) on one plate alternately N-S, magnets, two plates, "looking at each other," the same poles (repel). magnets on one plate are placed centrally on the coils, the other on the edge of the blade. After placing the engine (before gluing magnets in their places) you can quite easily manipulate them experimentally determining the best location - hold the stator plate quite a bit.
• Instead of the typical commutator is shown in this structure can be usefully applied structurally simpler commutator flat with laminate for printed circuit boards.
• method of execution and dumping the coils in resin is described in detail in posts on the construction of "American."

results and potential directions of development of construction:

• engine design is very simple and easy to implement in terms of the average home workshop. The engine can be successfully used to drive different models, especially the flying and driving.
  
• engine features high torque (rotor diameter!) And very high turnover: starts from 1.5 V at 5V reaches very high speed and it is observed a tendency to rozbiegania up. "
  
• modernization Directions: larger diameter-larger coil - more power. The next increment will achieve maximum efficiency approaching magnets to the blade and optimizing the position increasing the number of magnets and coils (and the commutator section.)

NOTE:
rotor brushes in the diagram should be rotated 90 degrees (parallel to the magnets)!