Topic Author
Posts: 168
Joined: Sun Jun 03, 2001 1:38 pm

Headset Wiring

Mon Jun 24, 2002 4:25 pm

Here's a tech question- I have both a David Clark headset and a Telex. The Clark set has a single plug for ground/cockpit communications. Does anyone have a wiring diagram to rewire for a double (mic/sound) plug? The Telex already has the 2 plug setup..

Posts: 5660
Joined: Thu Jan 27, 2000 12:16 pm

RE: Headset Wiring

Mon Jun 24, 2002 7:48 pm

Your DC is a helicopter set-up; you can purchase adapters for the same purpose, IIRC.
...three miles from BRONS, clear for the ILS one five approach...
Posts: 3369
Joined: Sat Oct 25, 2003 1:58 am

RE: Headset Wiring

Mon Jun 24, 2002 9:32 pm

Your DC headset very likely has a "straight" dynamic microphone that is typical for helicopter and military applications. Your telex very likely has an "amplified" dyamic microphone that is typical for fixed wing civilian applications.

These two microphones are not compatible. The amplified dynamic unit requires a bias voltage to operate. The straight dynamic unit does not. If you use a simple plug adapter you will destroy the David Clark microphone the first time you transmit.

There is a chance that your DC set has been fitted with an amplified dynamic unit. Check the microphone before trying an adapter.
Posts: 541
Joined: Sun Jun 11, 2000 9:46 am

RE: Headset Wiring

Mon Jun 24, 2002 9:39 pm

As a SR* geek, the correct term for "amplified" dynamic microphone is "condenser mic"...in the SR world, condensers operate on a +48V "phantom power" sent across the XLR connector that serves as the bias voltage for the pickup ceramics inside.

And, yes, Airplay, odds are that the DC unit has a dynamic microphone and not a condenser.

*SR-Sound Reinforcement

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