Phantom Power Supply For The Panasonic WM-‐61A Electret Microphone In-‐Ear Measurements of Headphone Frequency Response Using Room EqualizaFon Wizard (REW) SoIware
Based On The Original Design By symphonic and mods by micmacmo, Arleus, wdahm519, & kibblefat
Phantom Power Supply BOM From Digi-‐Key.com QuanFty Part Number DescripFon Unit Price Total 1 P9925-‐ND MICROPHONE CARTRIDGE 6MM OMNI $1.92 $1.92 2 CP1-‐3513-‐ND CONN JACK STEREO R/A 3PIN 3.5MM $1.47 $2.94 2 CPF10.0KDCT-‐ND RESISTOR METAL FILM 1W 10.0K OHM $0.278 $0.56 2 495-‐3824-‐ND CAP FILM 3.3UF 310VAC RADIAL $3.27 $6.54
Consider buying extra microphone cartridges and resistors in case you damage some during your build. You will also need a PCB like the one from Radio Shack shown, below. You can leave it unboxed, buy a basic plasFc box, or install it in a tea Fn or a steam punk box. Prices published in April 2012.
Common Ground
Ground wires to jacks from common ground
Hot wire from baTery shares 2-‐hole Trace with Resistor 1
Capacitor 1
Mic OUT To Computer This Side of PCB
Capacitor 2 Green = Right Channel Red = LeI Channel
Mic IN This Side
Resistor 1 and Capacitor 1
Design modificaFon by wdahm519
Resistor 2 and Capacitor 2 Hot wire “link” from Resistor 1 to Resistor 2
Design modificaFon by wdahm
Hot wire from baTery snap shares 2-‐hole Trace with Resistor 1 Resistor 1
Resistor 2
Mic IN
Mic OUT to Computer
Capacitor 1
Capacitor 2
Hot wire from BaTery snap
Ground Wire from BaTery Snap to Common Ground Column on PCB
Common Ground Column on PCB
Sleeve = Common Ground Ring = Right Channel
Tip = LeI Channel
My copy of micmacmo’s design mounted in a tea Fn
Drill 4 holes for the bolts at the corners of the PCB. Drill holes for the Mic IN and Mic OUT 1/8” Stereo TRS jacks. A 9 volt baTery is secured to the Fn with velcro.
Two Phantom Power Supply Units at back leI
kibblefat’s BOM
kibblefat’s Phantom Power Supply Design
By kibblefat
kibblefat Boxed
Reflow Solder Technique for Panasonic WM-‐61A Electret Microphone
Mic with black wire resFng on the center of the solder pad ready for reflow soldering. 26 gauge wire with 1/32” of insulaFon stripped and Fnned. Gauze protects wire from hemastats elevated so Fp of wire is centered on top of mic solder pad. Touch iron to pad for 1-‐2 seconds. Any longer may destroy the FET. The wire will “fall” into reflowed solder. Repeat for the other side. Test and seal with epoxy. Connect other end of wires to a female RCA plug. See John Conover’s photos and thorough descripFon of this method: hTp://www.johncon.com/john/wm61a/
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There was a problem previewing this document. Retrying... Download. Connect more apps... Try one of the apps below to open or edit this item. MIC 2017.pdf.
can reduce a lot of after sale service costs. It is not only ... Short Circuit Protection: when positive and negative ... Temperature/Humidity Detection: self-protection.
Download. Connect more apps... Try one of the apps below to open or edit this item. PSU (Power Supply Unit).pdf. PSU (Power Supply Unit).pdf. Open. Extract.
in position 2. Multiple LTC2937s can share sequence position information, so that sequence position N happens at the same time for all LTC2937 chips, and.
