Ham radio

FUSE-“PHOENIX”

25.05.201813.05.2018Himself an electrician

Overcurrent, short circuit for power supply… To protect against this scourge in the apparatus used old world as the means of fuses. Some are mounted in a special cartridge-holders, others are soldered in the circuit Board that simplifies the design itself, but complicates the replacement of burned out “inserts” healthy.

THE SECOND PROFESSION OF AN ELECTROCARDIOGRAPH

25.05.201813.05.2018Devices helpers

In the process of creating Amateur designs may require tools and equipment that are available it is often difficult. In such cases, comes to the aid of ingenuity, and craftsmen are doing everything they can with their hands. We will talk about how you can make a real recorder-thermoregulator from the old electrocardiograph type ЭК1Т-03M (Fig. 1).

Music game world

25.05.201813.05.2018Devices helpers

Deserved recognition and popularity enjoyed by amateur radio operators is quite simple and reliable circuit includes flip-flop on the two transistors and a pair of thyristors controlled them. It allows you to alternately switch the four incandescent lamps or garlands for the effect of “running lights”.

MULTIMETER MOTORIST

25.05.201813.05.2018Devices helpers

Owners of digital multimeters offer to acquire a homemade console that will allow you to convert the popular M-830 M-832 and their counterparts in the universal devices, capable to become a reliable assistant and service vehicles. In particular, it will be possible (along with the already mastered many of the health check of the relay-regulator, a current measurement battery power and other electrical parameters on-Board network) to quickly estimate the important performance of the ignition system carburetor of the engine, as the crankshaft rotation and angle, open (easily converted into a corner closed) status breaker contacts.

BATTERY — 220!

25.05.201813.05.2018Himself an electrician

Nowadays there are cases of power failure. In such a situation, can save the emergency power supply. For example, from a car battery with a homemade voltage Converter 12/220 V. Saw: stock power is enough for several hours of modern television, the lighting of the lamp or other appliance with power up to 100 watts. The maximum current consumption from a battery does not exceed 11,5 A.

THE TESTER IN YOUR POCKET

25.05.201813.05.2018Devices helpers

By making a mini tester, for several years I use them when repairing household electrical and radio engineering. Assembled by the classical scheme, the device allows with a sufficient accuracy for practice to measure the voltage to 300 V in DC and AC, test resistors, diodes, transistors, and capacitors.

SIZE ADAPTER “CROWN”

25.05.201813.05.2018Himself an electrician

When you turn on the power source smoothing capacitor C1 is gradually charged via the resistor R4, serves to protect the diode bridge VD1 overload. There is a voltage at the output of the trigger divider. Due to the fact that it affects the resonant circuit, consisting of transformer T1 and capacitor C2 in the secondary winding II is induced EMF from the pulse, the power of which is sufficient to switch the transistor VT1 is in the saturation state, although the initial moment of time the current through this semiconductor triode is not due to the self-inductance of T1. Then starts to do the “addition” from the winding II, holding VT1 is in the fully open position.

YOUR E-PSYCHOLOGIST

25.05.201813.05.2018Devices helpers

A set of electronic devices that use psychologists is constantly expanding. In addition to the “Polygraph” (the”lie detector”), there are other devices to test the emotional state of the person. The hallmark of the modern psychologists is electronic visual and sound indications, the ability to connect to the computer and transfer data across large distances. A simple device of this type it is not difficult to do with basic skills build the circuits.

ELECTRONICS: FROM DESIGN TO FILLING

25.05.201813.05.2018Devices helpers

It would seem that all good pocket flashlight “Elektronika B6-03”: from design to filling, including a fairly capacious battery of three disk accumulators D-0,26. But… As shown by operating experience, the charger it is truly useless.

THE HEAT IN THE HOUSE

25.05.201813.05.2018Himself an electrician

If you want to have in the house and other buildings efficient heating and cleanliness, you can always use the electric-powered three-phase network with voltage of 380 V, both independently and in conjunction with a boiler for solid or liquid fuel.