Mini Metronome

Linear scale - Small size

40 to 208 beats per minute

Circuit diagram:

Mini Metronome circuit diagram


P1______100K   Linear Potentiometer

R1_______10K   1/2W Trimmer Cermet
R2_______10K   1/4W Resistor
R3______330K   1/4W Resistor
R4_______50K   1/2W Trimmer Cermet
R5______100K   1/4W Resistor
R6,R7_____1K   1/4W Resistor

C1________1F   63V Polyester Capacitor
C2_______10nF   63V Polyester Capacitor
C3_______47µF   25V Electrolytic Capacitor

IC1_____NE555   General purpose timer IC

Q1,Q2___BC560C  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)