emreoruc
| | Tarih: 19.09.2006, 14:22 Mesaj konusu: küçük bir metronom | |
| 40 to 208 beats per minute
Malzeme Listesi :
P1______100K Linear Potentiometer
R1_______10K 1/2W Trimmer Cermet
R2_______10K 1/4W Resistor
R3______330K 1/4W Resistor
NOT:
Notes:
Q1 & Q2 provides 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 which are the 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.
R4_______50K 1/2W Trimmer Cermet
R5______100K 1/4W Resistor
R6,R7_____1K 1/4W Resistor
C1________1µF 63V Polyester Capacitor
C2_______10nF 63V Polyester Capacitor
C3_______47µF 25V Electrolytic Capacitor
IC1_____NE555 General purpose timer IC
Q1,Q2___BC560 45V 100mA Low noise High gain PNP Transistors
Q3_____ZTX753 100V 2A PNP Transistor
SW1______SPST Switch (Ganged with P1)
SPK______8 Ohm 40mm. Loudspeaker
B1_____12V Battery (MN21, GP23A or VR22 type)
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