Mini Metronomes

Published:2013/7/30 20:37:00 Author:muriel | Keyword: Mini Metronomes | From:SeekIC

Parts:P1 100K Linear PotentiometerR1 10K 1/2W Trimmer CermetR2 10K 1/4W ResistorR3 330K 1/4W ResistorR4 50K 1/2W Trimmer CermetR5 100K 1/4W ResistorR6,R7 1K 1/4W ResistorC1 1µF 63V Polyester CapacitorC2 10nF 63V Polyester CapacitorC3 47µF 25V Electrolytic CapacitorIC1 NE555 General purpose timer ICQ1,Q2 BC560 45V 100mA Low noise High gain PNP TransistorsQ3 ZTX753 100V 2A PNP TransistorSW1 SPST Switch (Ganged with P1)SPK 8 Ohm 40mm. Loudspeaker B1 12V Battery (MN21, GP23A or VR22 type) Notes:Q1 & Q2 provide linear frequency operation of IC1 following P1 resistance variation.Q3 was added in order to obtain a louder click, similar to clockwork metronomes.12V micro battery was used to obtain more output power and more compactness.Rotate P1 fully towards R2, then set R1 to obtain 40 beats per minute (compare with another metronome).Rotate P1 fully towards R3, then set R4 to obtain 208 beats per minute.Finally mark the entire scale with the usual metronome steps as following:40 - 42 - 44 - 46 - 48 - 50 - 52 - 54 - 58 - 60 - 63 - 66 - 69 - 72 - 76 - 80 - 84 - 88 - 92 - 96 - 100 - 104 - 108 - 112 - 116 - 120 - 126 - 132 - 138 - 144 - 152 - 160 - 168 - 176 - 184 - 192 - 200 - 208.



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