In order to obtain a sound signal of high power (10 – 20W) from the simple Assembly of a sound generator, does not require complex amplifiers WOOFER.
The generator on the popular chip KP1006BU1 (DA1) is enabled by almost classical scheme and in the description is not needed. The output frequency is approximately 1000 Hz. It can be considerably corrected by changing the values of the elements C2 and R2. The output frequency in this circuit is calculated by the formula:
F(kHz) = 1,44/(R1 +2xR2)xC2, where the resistance of the resistors R1, R2 in ohms, and the capacitance of the capacitor C1 is in microfarads.
Ham radio
“RAZLAGALSA” BATTERY
On the recommendation of the manufacturer to eliminate the memory effect of Nickel-cadmium batteries (NiCd) should clear their element to 0.4 V. For the implementation of the above requirements and automate the process of disconnecting the battery reaches level 0.4 V the authors propose a simple device.
To reduce the disconnection threshold of the discharge transistor /T2 is selected with a high rate of current transfer. The load (in addition to the resistor R2) and at the same time an indicator is incandescent НL with a voltage of 1 V at a current of 75 mA. In the absence of a low-voltage light bulbs a consumer may be led АЛ307Б.
MAGNETIC PROBE WITH ALARM
Of the readers who didn’t lose metal parts or tools? Sometimes it happens at the most inopportune time and threatens to permanently stop work. Lost somewhere in the grass screwdriver that fell behind the Cabinet chisel or a failure in a pier of pliers is able to ruffle anyone. In such cases a simple device – a magnetic probe with light and sound alarm. Using this simple device, you can easily find the loss in hard to reach places and the fact findings you will be notified outbreak warning led and buzzer. The principle of operation of the probe is quite simple – on a long rod fixed two magnet “sticking” to the metal object which closes the circuit and lights the warning led. Thus, you can know when the probe with discovery, you can extract the “light”.
B-25 Mitchell Bomber
RC replica model in 1/9 scale American bomber during the Second World war. Model made from balsa and plywood construction designed for use with internal combustion engines.
REED SECURITY — SIMPLY AND EFFICIENTLY
Security systems are a rapidly developing area of modern electronics. Published a huge number of various schemes and designs that can make anyone a couple of times was holding the soldering iron. For example, “electronic security guards” can warn of an intruder enters the premises or to signal the presence of the recorder for unauthorized sound recordings.
Porsche 911 GT3 RSR
All-wheel drive R / C model Porsche 911 GT3 RSR on the chassis of the entry-level Fazer. Chassis Fazer is equipped with an internal combustion engine Kyosho nitro type GF-16SG and a fully installed and configured radio system Kyosho Perfex/Futaba KT-6.
THE FUSE IN THE AC CIRCUIT
Circuit of electronic fuse alternating current, represented in the figure, protects the circuit in which the output is regulated by the triac (or just the triac operates in the mode “connect – disconnect”) by removal of the control signals when current exceeding the specified value (emergency operation).
Kyosho Lamborghini C-1
Lamborghini C-1 CAT – model racing boats internal combustion engine, developed in collaboration with Lamborghini. The boat more than a meter and is equipped with a powerful engine will make You and others forget about the fact that You control only model – speed performance exceed all expectations!
SIGNALLER ICING
The formation of ice on the surface of the blades of the rotor (screw) microgenerator-ROV, wind turbines, anemometers, propeller vanes, fans, degrades performance and may lead to dangerous modes of operation – imbalance, vibration, destruction of bearings, the possibility of destruction of the structural elements is relieved by ice. To prevent such operation it is necessary to detect and eliminate incipient icing.
TO CONTROL THE MOVEMENT OF THE HAND
Before proceeding to describe the proposed design should make an important note. Developed contactless control can be applied not only in computer technology. Described constructive design and purpose of the device is just one example of its possible applications.
Among fans of aviation history well-deserved popularity of the computer game “Il-2. Forgotten battles” with many additions. No history textbook do not explain the calm courage of the pilot of attack aircraft, precisely as in a laboratory experiment, leading on the combat course is tormented by flak machine. Or the frenzied excitement of the pilot “the Ride”, seeing as growing in his sight silhouette “Boyana”.
