Syzygies
500+ Head-Fier
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- Nov 16, 2004
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Does anyone have recommendations for surface mount resistors for stepped attenuators?
All this recent talk about pots and attenuators got me thinking again. I want an inexpensive, practical stepped attenuator design for portable use in cases too small for the Alps Blue.
I'd like to make a 25 step "volume, trim" stepped attenuator using these parts or similar (the drawing shows the switches positioned in the 24x70mm space inside a Hammond 1455J12 case):
http://www.alliedelec.com/Cart/Produ...p?SKU=948-7182
GRAYHILL INC. 56DP36-01-2-AJN
Switch, Single Rotary, Printed Circuit Terminals, 1/2" Dia., 2 Poles, 5 Position
2 x $8.69 each = $17.38
http://www.mouser.com/index.cfm?&han...*&N=0&crc=true
Vishay/Dale TNPW Series 1/8W 1206 Precision Thin Film Chip Resistors 0.1%
24 x $0.69 each = $16.56
I know these switches are non-shorting, and I'm trying to take that into account in my circuit. I can't find shorting versions this small in stock anywhere. (4 DPDT switches for a 16 step binary attenuator would take up more space than this.)
All this recent talk about pots and attenuators got me thinking again. I want an inexpensive, practical stepped attenuator design for portable use in cases too small for the Alps Blue.
I'd like to make a 25 step "volume, trim" stepped attenuator using these parts or similar (the drawing shows the switches positioned in the 24x70mm space inside a Hammond 1455J12 case):
http://www.alliedelec.com/Cart/Produ...p?SKU=948-7182
GRAYHILL INC. 56DP36-01-2-AJN
Switch, Single Rotary, Printed Circuit Terminals, 1/2" Dia., 2 Poles, 5 Position
2 x $8.69 each = $17.38
http://www.mouser.com/index.cfm?&han...*&N=0&crc=true
Vishay/Dale TNPW Series 1/8W 1206 Precision Thin Film Chip Resistors 0.1%
24 x $0.69 each = $16.56
I know these switches are non-shorting, and I'm trying to take that into account in my circuit. I can't find shorting versions this small in stock anywhere. (4 DPDT switches for a 16 step binary attenuator would take up more space than this.)
