Designing electronic devices on integrated circuits, radio Amateurs often use to display the information indicators IN gas-1 — IN-16. They usually feed from the mains AC voltage of 220 V or from a separate winding of the transformer. Consequently, the instrument is “tied” to the grid and they can not be used in the field.
Many tinkerers are often trying to adapt three phase electric motors for various homemade machines: grinding, drilling, and other woodworking. But here’s the problem — not everyone knows how to feed this motor from single phase.
With great interest I read in “M-To” article L. Christmas “Cellar, on the balcony.” Without a doubt, the invented by good and necessary in a city apartment unit. Writing about the atom with knowledge of the matter, as he for two consecutive years, keeping vegetables on the balcony in a similar thermostat. The results are excellent: all placed in a container in the autumn, stored until spring.
Most of the photographers prefer flashes with battery. Such pulsed lamps serial production get a charge from the battery “Molniya” or the inverter low voltage dry cells in the high. But “Lightning” is rarely for sale and is kept short. Batteries do not save enough — the kit is barely enough to shoot two narrow films. So we have Willy-nilly “attached” to a wall outlet.
A variety of light device (sdes), from the simplest to the most complex — widely used for the decoration of Christmas trees, holiday youth parties and even school discos. Therefore, the readers ‘ interest, the CDS continues unabated.
Almost three hundred years ago Peter the great issued a decree “On the celebration of the New year,” which was ordered “by the noble and carriageways streets at the gate and houses inflict some decoration of trees and branches of pine, spruce and juniper”. This custom caught on with us and became very popular. In the forest nurseries of the country annually produces more than ten million specially grown trees. Nurture each tree on the “new” plantations, accounting for at least 10 years.
Light setup is very popular among young people. Scheme of another variant of this device suggested that the magazine “Radio, TV, electronics” (NRB). It consists of three color channels (red, yellow, blue) with frequencies section: 700 Hz to 3.5 kHz of 13.5 kHz. The design is greatly simplified thanks to the use of four similar blocks. “Filling” each block consists of two transistors and three resistors (see the diagram of block # 1).
The scheme is simple electronic guard device published the magazine “Funkamateur” (GDR). Across the doors of the protected object stretched thin wire. Until he is whole, the tension on the bases of the transistors VT1—VT3 are few and they are closed. In case of wire break on VT1 through a resistor R2 receives the bias voltage, and this semiconductor device is opened. Now, through a chain of R2—R4, the transistor VT3 will get more offset. Relay K1 will work, and its contact system will include a siren, a buzzer or a lamp. Moreover, the elimination of wire break will not change the situation is to disable the watchdog is possible only with the switch ЅА1.
Although the industry produces a wide variety of beds, making the simplest variant, shown,will take just a few seconds — you just have to insert in the hole on a spool of thread the filter from a cigarette or a piece of foam. Important feature: needles are stored together with the thread.
The Romanian magazine “Technium” offers a diagram of the electronic timer operates on the principle of the 5-minute hourglass clock every minute. The indication to carry out the LEDs. Such a device will find use in a home darkroom, sports training and rhythmic gymnastics. If the time interval exceeds 5 minutes, the device as a normal hourglass, you can restart and continue counting. Here’s how it works.