TimT From United States of America, joined Jun 2001, 168 posts, RR: 0 Posted (13 years 10 months 2 weeks 2 days 8 hours ago) and read 11532 times:
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..
Airplay From , joined Dec 1969, posts, RR:
Reply 2, posted (13 years 10 months 2 weeks 2 days 2 hours ago) and read 11508 times:
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.
Victech From United States of America, joined Jun 2000, 546 posts, RR: 2
Reply 3, posted (13 years 10 months 2 weeks 2 days 2 hours ago) and read 11504 times:
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.