• on Audio/Video/Photography
  • Published in issue 11/2008 on page 38
About the article

Motorised Volume Pot

High-end with remote control

Motorised Volume Pot
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1,R3 = 10kohm
R2 = 82ohm
R4 = 390ohm
P1 = Alps 10kohm logarithmic stereo motor potentiometer (e.g. RK27112MC)
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
D1 = 2-pin dual-LED
IC1 = ATMEGA8-16PU, programmed, Elektor SHOP # 071135-41
IC2 = SFH5110-36 (possibly via 3-way SIL pinheader)
IC3 = 7805
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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