Computer Headset Adapter Project Parts List
     

Computer Headset Adapter Project Parts List

RadioShack order numbers where available

Quan            Description            Radio Shack #

 2            1458 Dual section op-amps            276-038
 2            8 pin PCB DIP sockets            276-1995
 1            Printed circuit project board            276-159
 4            Standoffs            276-195 (set 4)
 1            Project metal box enclosure            270-238
 1            DPDT (on-on) miniature toggle switch            275-636
 1            12 DC around 100 ma wall wart power supply            273-1773
 2            3 wire (stereo) 1/8 inch jacks             274-0249 (set of 2)
 1            Coax type chassis mount DC connector            274-1583
 2            Matching plug for above – one for wallwart and one for 9 volt battery            274-1573 (set of 2)
 1            XLR-3 male chassis count connector            *
 1            ¼ inch mono chassis mount jack with normal through switch             274-255
 2            0.005 uf ceramic capacitors            272-130
 2            0.01 uf ceramic capacitors            272-131
 1            0.1 uf metal (for audio)             272-1053
 3            220 uf 25 volt electrolytic            272-1029 or 272-1017
 1            100 uf 10 volt electrolytic            272-1028 or 272-1016
 1             7805 5 volt DC three pin regulator             276-1770
 1            Murata DC to DC converter two voltage output (5 volts in ± 12 volts out) model NKA0512SC             *
 1            100 to 1000 ohm miniature variable audio taper potentiometer with on/off switch             *
 1            Suitable knob for above pot            *
 
Resistors (1/2 watt unless noted) – RadioShack numbers are sets of five
 2            68 ohm            271-1106
 4            4.7 K            271-1124
 6            1 K (shown as 470 ohm in schematic but 1 Ks are actually better)            271-1118
 1             100 ohm            271-1108
 2            33 K            271-1104
 1            10 K            271-1126
 2             56 K             *

(an odd value you can get close enough to 56k by series a 22k (RS 271-1128) and a 33k (RS 271-1129))
(*) Builder may have to sample other sources (Digikey, Mouser etc.) for those parts.

Also: Miscellaneous construction components such as solder lugs, hook-up wire, bus wire, label material, etc.

Schematic
Click on image below for enlarged view

(Click for enlarged view)

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Comment List:

One ooopsie in the schematic, I believe. Most if not all computer mics have the +5v wired to the ring of the 1/8" plug/jack; it's not a "true" phantom power setup.
By Tom on 3/9/2012

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