The only compromise made in this design is to use 5db steps rather than the standard 3db. This means that the whole thing can be fitted around high quality 12W rotary switches. 3db steps are, in any case rather small. 5db steps are rather more definite nad when you get used to it more satisfying.
Step 2: STUFF YOU'LL NEED
RESISTORS, 0.1%, 2 OFF EACH VALUE REQUIRED FOR STEREO
R1 = 11k5 R6 = 357R R11 = 47R
R2 = 6k65 R7 = 200R
R3 = 3k65 R8 = 121R
R4 = 2k05 R9 = 68R
R5 = 681R R10 = 33R
S1A(B) = 1 OFF 4P3W ROTARY SWITCH*
S2A(B) = 2 OFF 1P12W ROTARY SWITCH*
SK 1-8 High quality phono sockets, gold plated. 4 red, 4 black.
ABS CASE MEASURING 180mm x 155mm x 40mm
3 OFF 35mm PLASTIC KNOBS
- Make your life easier by selecting rotary switches with plastic shafts. After all you have to shorten them to fit the knobs.
Step 3: DRILL THE CASE
Phono sockets come in all types and sizes. The ones used on the prototype required 10mm diam holes. These are the professional variety which generally means chunky and gold plated. Of course some people might consider this an expensive conceit, well I'm not going to argue the toss. Fact is they look good and I reckon that alone makes the extra expense worthwhile.
Having drilled the holes the next task is to screw all the fittings into place. At this stage though leave both 12way rotary switches until after you have wired them up. Otherwise profanity and burnt plastic might become the order of the day.