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Motorised Volume Pot

High-end with remote control

Published in issue 383, November 2008

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.

Components

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

Click below to download a PDF copy of this article from Elektor magazine.

 

Downloads 

Article PDF
10 Elektor Credits
PCB PDF
Free download
 

Order this magazine 

Magazine November 2008
uk383 (USD 6.30)
 

Order from Elektor 

Programmed controller ATmega8-16PU
071135-41 (USD 11.80)
PCB, bare
071135-1
 

Free downloads 

Software

Free download

Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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