DEVICE FOR CHARGING BATTERIES is a rectifier device with electronic current regulator (Fig. 1). A rectifier manufactured by bridge circuit of diodes V1 — V4 (Fig. 2), and the electronic controller a current amplifier transistor V5. The necessary adjustment select using the divider resistors R2, RZ, providing current from 4 to 6 And at a voltage of 8-15 V.
INSTEAD OF A MICROPHONE — DYNAMIC HEAD
When there are dynamic microphone, you can substitute any small-sized dynamic head. Here’s what proposes to make to the Yugoslav magazine “Radio Amater”. Since the voltage developed by the head, a little, pre-amplify with low-yield of germanium, for example, МП39— МП42, or silicon (KT361, КТ203, КТ104) of the transistor included in the scheme with a Read more…
When the firebox of the fireplace or stoves in the country wood raw material to the combustion process from time to time it is necessary to control: throw the wood, increase craving, etc. to Replace “master’s eye” and recall this can offer an electronic device indicating the reducing flame in the furnace (the furnace).
In the process of operation acid batteries gradually sulfation of the plates which reduce capacity and shorten the life of the device. To eliminate this undesirable phenomenon, a special rectifier. The device is intended for use in stationary and field of auto repair shops. Collect it, you the driver with basic knowledge in electrical and electronics.
Flashing beacons are used in electronic home security systems and in cars as devices of indication, alarm and warning. Moreover, their appearance and “stuffing” are often not distinguished from beacons (special signals) emergency and operational services.
Change arrow indicators the dog often come led. And this is not surprising: the second is much easier and safer first. Simple five-level scheme of the AF voltmeter to the voltage of 0.1—0.6 volts, where the indicators are LEDs, published in the journal “Рипката1ег” (GDR). If the signal fed into socket x2, XS, the voltage exceeds 0.1 V, open transistors V2, V4 and, as a result, the led turns on Q1. With an increase of the signal to 0.2 In open semiconductor triode V6 and the led flashes B2. When the signal voltage reaches about 0.6 V, burn all the LEDs.
Recently, widespread quartz alarm clock made in China, characterized by a relatively high ring volume and cheapness. If the watch is out of order, but the alarm clock still works, it can be used in a variety of makeshift structures. For example, the proposed indicator of a bite.
Protection of your house and garden from small rodents, insects relevant today. Various industrial devices “repellents” are on sale, but this same device is able to produce hams with a medium level of training. Unlike many schemes of such devices listed below are quite original. Known schemes are based on the ultrasonic frequency generator (uzch), “loaded” to the piezoelectric capsule. The frequency of these generators can be tailored (adjusted by changing the values of the RC circuit), but it is invariant under the operation of the device, and therefore of the generator. That is, any rodents, insects, birds or animals would not be “programmed” generator uzch (all of these entities are afraid of the discomfort of pulses of a certain frequency), over time, the device ceases to be effective due to rodents or insects exposure.
In the Food program of the USSR much attention is paid to food production in farmlands and suburban areas. A contribution to this important cause made the young Amateurs of RCUT of the Kazakh SSR. They prepared and tested a number of automatic devices that will help to grow agricultural products. The developers sought to create devices that are available for repetition at home. Oki have sufficient accuracy (±5-10%).
The water treated by an electric current, acquires new properties: some of it manifests itself as a weak alkali solution and the other acid. When activated in this way the water felt on animals and plants, it was found that the liquid with alkaline properties were the stimulator, and one that bears signs of acid inhibits the growth of microorganisms and cells of living tissue.