Mini color music. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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For novice radio amateurs, the manufacture of a "solid" thyristor-based light and music installation is a difficult task. A scheme for a simple SMU that does not contain thyristors is offered by the Funkamater magazine. The device can be connected to both mono and stereo amplifier; for this, two identical input stages are provided on transistors V5, V6 (see diagram). A three-channel crossover filter is connected to them.
(click to enlarge)
The upper channel according to the scheme (V7, V10) passes only high frequencies, determined by the small capacitance of the capacitor C12. In the collector circuit of the transistor V10, two lamps from a pocket flashlight, painted yellow, are connected in series.
The second channel is the midrange. Capacitors C10, C13 determine the bandwidth of its crossover filter. Lamps H3, H4 are painted green.
The third is the low frequency channel. Capacitors C11 and C14 play the main role in his filter. Lamps H5, H6 are painted red.
The prefix is powered by any low-power step-down transformer for 6,3 V, 1 A. The rectifier is assembled in a bridge circuit with four diodes, or on KTs402 with any letter index. Terminal transistors V10-V12 are designed for a current of at least 300 mA, for example, P605, P608, P609. The remaining transistors are low-power, low-frequency, germanium, for example, MP42-MP39. Diodes - D302, D303, D242A, KD202A or KD208A.
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