Snare spring simulator plus variable volume snare drum. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Musician
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The circuits of this module receive a triggering impulse proportional to the force of impact from classic drum module. On transistors VT1, VT3, VT4, a pop snare drum is assembled with a frequency decreasing after the impact. The rest of the module is a modulator for simulating springs, for both versions of snare drums. To generate noise, the VT5 emitter junction is used in the avalanche breakdown mode. The DA1 chip and correction circuits provide a metallic overtone to the noise signal. Field-effect transistor VT6, in inverted switching, is a noise signal envelope modulator. Switch S1 allows you to select the type of base sound of the snare drum.
(click to enlarge)
After applying the signal from the spring modulator, the sound of the drum is quite similar to natural. The spring aftersound regulator (4,7 MΩ), for adjusting to different performance tempos, is placed separately from the module on the control panel. I have a P1K type S2 switch soldered into the board and brought to the front panel, and the board is held on it. When repeating, the length of the circuit from pin 7 of DA1 to VT6 should be made shorter, and the module itself should be shielded from the rest with an electrostatic screen, in order to avoid interference with the noise generator signal. For this purpose, it is convenient to use metallized paper from cigarettes, grounding it. Resistor R2 sets the mode, near the beginning of the appearance of noise at the output of the modulator, but with its complete absence.
Author: E. Shustikov (UO5OHX ex RO5OWG); Publication: shustikov.by.ru
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