Monophonic electronic musical instrument (see figure) is assembled on a single chip К176ЛА7 containing four two-valve “AND—NOT”. On D1.1 is made the generator of frequency vibrato. The oscillation frequency at its output is 5-8 Hz. For valves D1.2 and D1.3 tone generator, and the D1.4 — the generator of high frequency oscillations. Thanks to our latest AMY can be used as a prefix to any radio receiver having a medium wave range.
When you press any keyboard keys (S1 — Sn) in the frequency-specifies the chain of the generator D1.2, D1.3 is connected a resistor; its resistance is determined by the position of the contact group in music row. A tone signal is modulated by the frequency oscillations are taken from the vibrato generator D1.1.
Castelnaudary signal is supplied to an RF generator D1.4. The oscillations emitted by the magnetic antenna W1,
taken at a broadcast receiver, which reproduces customemoticons vibrations of the tone generator. The radius of reliable reception will be 0.5 — 2 m.
The coil W1 has a ferrite core Ø 8 mm, length 100 mm, and contains 130 turns of wire PEL of 0.2, wound turn to turn.
It is powered by two battery 3336L. Current consumption is around 1 mA.
Our AMY may be an independent device, if instead of the RF generator, the valve D1.4 to use as a buffer separating cascade. In this case, it is sufficient to add a repeater in the transistors V1, V2 and phone capsule DEM-4m consumption current increases to 5 mA.
I. ARON, V. BEDANOV, V. BUGAEV, Ufa