rec.arts.movies.production.sound

I've been using the DPA adapters for a while now and have had
absolutely no issues with excess level. I've got 3 DPA4071s and
love their SM trx level sits around 30 for a most voices.

Brian


"Larry Fisher" wrote in message
news:il94c31hev9tjdsvpijgonrjl58s4vfrl8@ ...
> FAQ #109
> /faq/ ?id=109
>
> QUESTION: I have to much gain with my DPA microphone when I use it
> with an SM or newer 400 series transmitter. How do I wire a DPA
> lavaliere microphone to these transmitters with the servo input? Can
> this be compatible with my older Lectrosonics transmitters?
>
> REPLY: The servo input transmitters (SM series, UM400a, LMa, UM450)
> are designed for conventional high impedance FET drain outputs. The
> DPA mics use a low impedance, high current matching circuit that
> produces excess gain when used with the servo input. A simple series
> resistor matches the DPA mic to ALL our transmitters including all the
> older models (UM190, UM195, UM200, LM, UM400). The wiring is this:
>
> Pin 1 shield (ground)
> Pin 2 jumped to Pin 4 (sets bias at 4 Volts)
> Pin 3 to a 4 k Ohm resistor and the other end of the resistor is then
> soldered to the DPA bias wire (audio).
>
> The resistor is in series with the DPA microphone bias wire and
> converts it to the high impedance load that the servo input wants to
> see. Both we and DPA have tested this wiring with old and new
> Lectrosonics transmitters.
>
> If you don't have a 4 k resistor, any value from 3 to 4 k can be used;
> it is not critical. You can use the k resistors that we ship with
> all our 5 pin transmitters for instance.
>
> DPA sells an adapter that has the above wiring. It is DAD3056.
>
> You do not need the resistor with any other brand of transmitter for
> the DPA mics. This is unique to our circuit.
> I would like to thank the crew at DPA for their help with this.
> LarryF
> Lectro