This is a thread about my preamp project. I have asked Per-Anders for help with designing a complete solution and corresponding PCB to meets my following requirements. He has yet to accept this challenge but it is looking promising, right Per-Anders?
Here are the specs:
input voltage: 230V
case outer dimensions: 420(W)x320(D)x70(H) (mm)
Inputs: 5 (pairs) RCA (No phono input, only analog inputs like CD, PC, TV etc.) Bonus would be a digital input like a optical TOSLINK and DAC but it might be over the top.
Output: 1 (pair) RCA
Lighting: 5 LEDs, indicating which input is selected. Then output for at least 8-10 LEDs for lighting up the ring around the volume knob.
Input selector: This really don't matter as long as there is 5 notches in the selector hardware and a nice "feel" to the rotary selector switch. How it controls the input selection, be it relays or what ever, doesn't matter.
Volume control: Same here as with the input selector. The feel is the most important aspect. Be it ALPS or a stepped attenuator doesn't matter but price is always a factor. Power switch ON/OFF: I want to use this switch, Bulgin vandal proof momentary switch ( http://www.bulgin.co.uk/datasheets/Switches-Illum_v2.pdf
) Model MPI002 dual color LED, Red/Blue.
PCB quality: Doesn't matter but both Per-Anders and I like fancy, good looking PCBs of good quality so it is leaning towards that.
My budget for this build is about 4000kr or $500-$600. That is to include PCB, interconnect cables, components, switches, potentiometer but not the RCA connectors and chassis.
I am not an audiophile and don't have trained ears so I am sure I will be happy with almost whatever I end up building. I am mostly doing this because it is fun to build stuff I can use and to create something esthetically pleasing (and good sounding)
Any and all contributions to this project is greatly appreciated!