Ham radio

Wireless microphones VHF with frequency modulation (FM) is very convenient when you need to organize one-way communication over a short distance. For example, between residential and utility rooms, parents and children in the yard, and between the crews of the vehicles, the business partners in the market, aid in the organization of cultural activities etc. is Indispensable these compact electronic device when capturing and listening to sounds in nature, as between the information source and the recipient occurs distance, largely conditioned by the “range” used VHF radio.

“beats” the beats not only sound, but light pulses. In his scheme includes two transistor of different conductivity. The excitation amplifier is implemented by using positive feedback through the capacitor C1. The pulse repetition frequency — from 40 to 210 per minute — adjust the variable resistor R2. The amplitude — adjusted with resistor R5.

measuring constant voltage value of 100 V. It is produced by the bridge circuit for the transistors T1 and T2. In one diagonal bridge included a measuring device in the other power source.

When lighting and electricity were cheap, the question of cost-conscious approach when choosing lighting stairwells seriously anyone is not intended. But life has taught everyone to count every penny, so convinced of the feasibility of using the machine include a ladder and corridor lighting (ALLCO) there is no need. The question is: which of the many existing developments to choose?

I designed a digital timer, which wrist watch, MONTANA, has a great standby time (up to 24 hours), good precision (the error is only a few seconds per day), simplicity, performance and small power consumption in the standby mode. The latter allows you to use the timer as a cost effective and pretty original clock. However, the load in this case is used with a tape cassette that is included in the reproduction, or radio receiver, tuned to the station.

Those who have read the jump by Charles Perrault or watched the cartoon “puss in boots”, remember how much trouble was the cat that didn’t want to catch mice… So it opened a white light — cats should catch mice, and mice hiding from cats. And of course, each of the parties, not wanting to be the loser, goes to all sorts of tricks: the cat sits motionless for hours in ambush, or repeatedly bypasses the possession; mouse cleverly disguises its burrow, satisfied with spare moves.

Ubiquitous electronics is steadily expanding its “activities”. Where yesterday it was considered “foreign”, today it becomes indispensable helper. Approval this fully applies to karting. Smooth engine operation and high speed, readiness “number one” at the start and scrupulous accuracy at the finish be possible in collaboration with the electronics.

A modern casino with excellent gambling attracts many, but to go there dare not everyone. Another thing — home electronic arcade. Here and nice and safe and the costs are minimal. On how to initiate the creation of such games, says the factsheet, which draws on materials from the Bulgarian periodical “Young designer”.