“Development, published in the journal “modelist-Konstruktor”, make ourselves photoelectron shooting. Works flawlessly. It is a pity that the sounds in the scheme is not provided. Help!”. The fraction of machine-gun fire, screeching min, heavy bass bombs… Simulates a similar sound picture of the fight is pretty simple device, made only three transistors.
As can be seen from the circuit diagram, simulator sounds of battle consists of a self-excited pulse generator — multivibrator on VT1 and VT2 transistors, an amplifier (semiconductor triode VT3) and the dynamic head of BA1. And choose sound effects the user, by pressing certain control buttons.
To simplify the design uses a single shared generator mode of operation which changes the corresponding switching. In the “machine gun” this multivibrator receives power directly from the battery GB1 via the switches S4 (it includes the simulator) and the S1, which (through the contacts of S1.2, S1.3) in parallel with the capacitors C5, C7, connects the relatively large capacitance of C3 and C6, which provides a “place” with some frequency “shots”. If desired, adjusting the value of capacitors C3 and C6, to change the frequency with which “scribbling machine gun.” The amount of current of the transistor VТЗ indicated in the diagram, set the selection of resistor R5.