Article
Motorised Volume Pot
High-end with remote control
Many audio enthusiasts still prefer a good potentiometer for adjusting the audio volume. It would be even nicer if this potentiometer could also be controlled remotely. This is possible with a high-quality motorised potentiometer from Alps and a handful of electronics, as is described here.
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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PCB
Component list
Resistors
R1,R3 = 10kohm
R2 = 82ohm
R4 = 390ohm
P1 = Alps 10kohm logarithmic stereo motor potentiometer (e.g. RK27112MC)
Capacitors
C1,C7,C8 = 100nF ceramic, lead pitch 5mm
C3 = 100pF, lead pitch 5mm
C4,C5 = 22pF, lead pitch 5mm
C9 = 220uF 25 V radial, lead pitch 2.5mm
C10-C13 = 22nF ceramic, lead pitch 5mm
Semiconductors
D1 = 2-pin dual-LED
IC1 = ATMEGA8-16PU, programmed, Elektor SHOP # 071135-41
IC2 = SFH5110-36 (possibly via 3-way SIL pinheader)
IC3 = 7805
Miscellaneous
B1 = B80C1500 (80Vpiv, 1.5A) (round case)
K1,K6,K9 = 2-way SIL pinheader
K2,K7,K8 = 4- way SIL pinheader
K3 = 7- way SIL pinheader
K4,K5 = 2-way PCB screw terminal block, lead pitch 5mm
X1 = 4MHz quartz crystal
PCB, ref. 071135-1 from www.thepcbshop.com
Controller software: free download 071135-11.zip
R1,R3 = 10kohm
R2 = 82ohm
R4 = 390ohm
P1 = Alps 10kohm logarithmic stereo motor potentiometer (e.g. RK27112MC)
Capacitors
C1,C7,C8 = 100nF ceramic, lead pitch 5mm
C3 = 100pF, lead pitch 5mm
C4,C5 = 22pF, lead pitch 5mm
C9 = 220uF 25 V radial, lead pitch 2.5mm
C10-C13 = 22nF ceramic, lead pitch 5mm
Semiconductors
D1 = 2-pin dual-LED
IC1 = ATMEGA8-16PU, programmed, Elektor SHOP # 071135-41
IC2 = SFH5110-36 (possibly via 3-way SIL pinheader)
IC3 = 7805
Miscellaneous
B1 = B80C1500 (80Vpiv, 1.5A) (round case)
K1,K6,K9 = 2-way SIL pinheader
K2,K7,K8 = 4- way SIL pinheader
K3 = 7- way SIL pinheader
K4,K5 = 2-way PCB screw terminal block, lead pitch 5mm
X1 = 4MHz quartz crystal
PCB, ref. 071135-1 from www.thepcbshop.com
Controller software: free download 071135-11.zip
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