Beginner radio amateur. Detector radio. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Beginner radio amateur. Detector radio. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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Beginner radio amateur. Detector radio, circuit

This diagram shows the simplest detector radio. Here you see two new parts - C1 - a variable capacitor and L1 - an inductor.

variable capacitor

A capacitor that can change its capacitance when its handle is rotated. Symbol

Beginner radio amateur. Detector radio

Inductor

A coil of wire has an inductance measured in Henry abbr. Mr. Symbol

Beginner radio amateur. Detector radio

The coil must be wound on a M400NN ferrite rod. A ferrite rod is a rod made of a special magnetic material, it can be purchased in the same place as everything else. I advise you to disassemble the radio receiver of the "Alpinist" or "Selga" type once. There is a rod and a variable capacitor and everything you might need.

Publication: cxem.net

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ISSATA LED drivers for Armstrong luminaires 16.06.2016

ISSATA Limited has developed two models of power supplies for Armstrong and similar luminaires, which meet Russian regulatory requirements for light ripple factor and have power factor correction (PFC).

New models of power supplies IS 35GM-350 and IS 50GM-350 have an output power of 35 and 50 W, respectively, and an output current of 350 mA; the output current ripple is less than 1% and the power factor is >0,95.

The power supplies implement a circuit to reduce the inrush current, which does not exceed twice the average current consumption. The low value of the inrush current allows you to connect a large number of fixtures to one group line and use circuit breakers recommended by the PUE with characteristic C to protect it. In this case, false trips of the switch will not occur at the moment the lighting is turned on.

The power supplies are operable in the temperature range -15°C...+45°C at an input voltage of 176-265 V, there is a complex of protections against short circuit, overload and overheating. The products are characterized by high reliability and have a price that allows them to successfully compete with the most common similar products on the Russian market. Using these drivers with an emergency power supply, you can make emergency lighting fixtures.

Main technical parameters of IP IS 35GM-350, IS 50GM-350:

Output power: 35W
output current; 350 mA
Output voltage range: 40-100V, 70-140V
Output current ripple: less than 1%
Power factor: not less than 0,95
Input voltage range: 176-265V (AC)
Efficiency: not less than 88%
Starting current: not more than 0,3 A, 0,53 A
Overall dimensions (LxWxH): 215x30x25 mm, 209x39x29 mm