It is used in teaching music in rhythmic gymnastics, in experiments in physics etc. a Metronome, a scheme which offers Bulgarian journal “Radio Television Electronics” (see Fig.), gives not only audio but also visual signals. With the help of variable resistors R1, R2 their frequency change in the range of 40 to 200 cycles / min. which corresponds to the musical pace from “grave” to “Prestissimo”.
A master oscillator is executed on a different structure of the two transistors V1, V2, V3 amplifier stage, operating in key mode at a dynamic head B1. Light signals generates the standby multivibrator V4, V5, which then increases the SIC transistors V6, V7.
All transistors, except for V7, silicon, low-power V7 should be of medium power, such as КТ603.
Recommend to read
ALMOST LIKE A CAN
During the canning of vegetables and fruits have to deal with wet and hot banks that need to move or carry. So they don't burn or slip out of hands, lignite from a piece of wire with a...
MAPS AND METAMORPHOSIS
What started karting? In the 30-ies very popular among American boys was competition for non-motorised trolleys moving along slant paths. Some Joker aptly called them "racing soap...
