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LED节拍器电路

2018-3-30 14:06| 发布者: dymodel| 查看: 74| 评论: 0|原作者: mind

摘要: 示意图 零件 Part Description R1, R4, R6 3 10K 1/4W Resistor R2 1 1.5 Meg Linear Taper Pot R3 1 120K 1/4W Resistor R5 1 220 Ohm 1/4W Resistor C1, C3 1 0.1uF Ceramic Dis ...
示意图
LED_Metronome_Schematic.gif
零件
Part               Description   
R1, R4, R6    3    10K 1/4W Resistor   
R2    1    1.5 Meg Linear Taper Pot   
R3    1    120K 1/4W Resistor   
R5    1    220 Ohm 1/4W Resistor   
C1, C3    1    0.1uF Ceramic Disc Capacitor   
C2, C4, C5    3    0.01uF Ceramic Disc Capacitor   
D1, D2, D13, D14    4    1N914 Signal Diode   
D3-D12    10    Jumbo Red LED   
Q1, Q2    2    2N3904 NPN Transistor   
U1    1    555 Timer IC   
U2    1    4029 CMOS Up/Down Counter IC   
U3, U4    2    4051 CMOS 8 Of 1 Switch IC   
U5    1    4011 CMOS Quad 2 Input NAND Gate IC   
SPKR    1    Small 8 Ohm Speaker   
S1    1    SPST Switch   
MISC    1    Board, Wire, Case, Sockets for ICs, Battery holder, Knob for R2   
   

Notes

    The circuit will reliably run from 6 to 12V. A typical 9V battery will be drained in several days by the LEDs with constant use. A 6V pack made from AA, C or D cells will last much longer.

    The circuit will need some calibration before use. Calibration is fairly easy and accomplished by using a stopwatch to count the number of beats. You'll want to calibrate for 60 BPM (one per second), 120 BPM (two per second) and 180 BPM (3 per second). Just use your stopwatch to find the points of R2 that correspond to those beat rates and the mark the dial appropriately. Next find 90, 150 and 210 BPM. By that time you should then be able to evenly mark the remaining positions on the scale.

    Blue LEDs need about 5V to light, so if you intend to use blue you will need to remove R5.

    For an ideal metronome effect, the LEDs should be arranged in an arc.

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