Valve Preamplifier (2)
construction
Materials
Gerber file
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Component list
– IEC appliance socket with internal filter
– Ventilator 40 x 40 mm, 20mm thick, 12VDC
– 2 ABS gearwheels 50.M0.5, Conrad Electronics # 237850*
– S1 = rotary switch, 6 positions, 2 poles, break before make, Conrad Electronics 709751*
– S2 = mains switch
– F2 = fuse 250 mAT (slow), with holder
– LED signal lamp, 12 VDC
– 4 black buttons, 21mm
– 4 button caps, red, with line, 21mm
– 1 button, 28mm
– 1 button cap, red, 28mm
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