Devices helpers

Seed stations and seed agro-laboratories often calculate “manual. Manual labor is unproductive and tedious, especially if you need to count a large number of seeds. Counting on 10 thousand grains of wheat takes about three hours. And to make a mistake during manual account easily. However, this operation can be replaced by a method of weighing, but due to the difference in sizes of the seeds of error in this case reaches 30%.

A lot of interesting instruments created in radio school of the Gomel Palace of pioneers and schoolchildren named after V. I. Lenin. Here are some of them: pulse the flash and the instrument for testing high-power transistors developed by members of the group Valery Denisenko and Sergey Skruzny.

Analog IC К176ХА10 was developed as a combined that contains a standard power amplifier of sound frequency (umzch) and has long been undertaken by radio Amateurs on Board. With supply voltage 9 In it has an output of 0.7 W at the output, but… recommended by the manufacturers the option to include К176ХА10 has impressive size and value (with the condition playlist “bass”) is the oxide capacitor, the reliability of which by modern standards is poor.

For more than ten years, using a homemade device proved during welding, cutting metal sheets with thickness from 0.6 to 12 mm, the power at the time of starting the engine of a motor vehicle starter, charging alkaline and acid batteries, starting and subsequent operation of the DC motor power up to 1.5 kW. Moreover, I represent the universal — it is also an excellent source of safe voltage for electrical equipment, cellar, basement, workshop…

I have developed a mini system is to automatically maintain the desired temperature and air humidity in the oven, covered boxes, as well as in greenhouses or other spaces. The design of it is basically block-aggregation (Fig. 1); mounting quite on forces to everyone who at least once in your life going even without soldering, and using connectors and twisting some simple electro – or radio circuit.

The availability of modern element base used in television remote controls (remote control), allows you to create a simple counter connected to the receiving side of the computer LPT port, adapting all this to count, such as boxes with finished products on the conveyor.

I want to share my version of the functional generator frequency sweep for the home lab. Consuming from the electrical power source 50 mA, is a compact, fairly simple to manufacture, the device generates periodic signals are sinusoidal, rectangular, triangular, and rectangular pulses for testing and tuning of the instrument, made on modern element base.

The agricultural theme, perhaps the most characteristic in the work of young radio Amateurs from syut Novosibirsk region. 14 new products — electronic devices for agriculture — provided they are meeting in Magnitogorsk. The originality of technical solutions, the relevance of development of children marked by the true: the majority of devices are awarded with diplomas and valuable prizes.

The weight started with the fact that the employee of the bell States telephone laboratories in new Jersey (USA) D. Hagelbarger created in the early 50-ies of the cybernetic device to play the so-called “coin”.