Lectrosonics UM500 User Manual download pdf (Page 12)

UM500

The best RF protection is accomplished by installing RF bypass capacitors at the mic capsule. If this is not possible,

or if you are still having problems, capacitors can be installed on the mic pins inside the TA5F connector housing.

2 WIRE MIC 3 WIRE MIC

CAPSULE

SHIELD

AUDIO

SHIELD

AUDIO

BIAS

TA5F

Preferred locations for bypass capacitors

CAPSULE

CONNECTOR

TA5F

CONNECTO

Alternate locations for bypass capacitors

Install the capacitors as follows: Use 330 pF capacitors. Capacitors are available from Lectrosonics. Please specify

the part number for the desired lead style.

Leaded capacitors: P/N 15117 Leadless capacitors: P/N SCC330P

All Lectrosonics lavaliere mics are already bypassed and do not need any additional capacitors installed for proper

operation.

Caution

When wiring the connector, do not use the connector body for any electrical connections. A common mistake is to use the

connector body as an audio ground. The connector body is already used as an RF ground on VHF models and no other use

is permitted.

LINE LEVEL SIGNALS

The normal hookup for line level signals is: Signal Hot to pin 5, Signal Gnd to pin 1, pin 4 jumped to pin 1, and pin 3

jumped to pin 1. This gives a 40dB attenuator that allows signal levels much higher than 3V to be applied without

limiting.

If more headroom is needed, insert a 100k resistor in series with pin 5. Put this resistor inside the TA5F connector to

minimize noise pickup.

If lower than normal line levels (less than 1V) are expected, use this hookup: Signal Hot to pin 5, Signal Gnd to pin

1, and pin 4 jumpered to pin 1. This provides a 20dB attenuator allowing signals as high as 3V to be applied without

limiting.

WIRING HOOKUPS FOR DIFFERENT SOURCES

SHIELD

AUDIO

BIAS

3 WIRE ELECTRET MIC

POSITIVE BIAS

SHIELD

AUDIO

2 WIRE ELECTRET MIC

NEGATIVE BIAS

TA5F

PLUG

SHIELD

AUDIO

2 WIRE ELECTRET MIC

POSITIVE BIAS

SLEEVE

SHIELD

AUDIO

TIP

LINE LEVEL

TA5F

RCA or 1/4 " PLUG

PLUG

(See notes on ‘LINE LEVEL SIGNALS” above.)

TA5F

PLUG

TA5F

PLUG

SHIELD

BIAS

AUDIO

WIRE ELECTRET MIC

NEGATIVE BIAS

SHIELD

DYNAMIC

Dynamic LO Z mic or electret with

TA5F

manufacturers power supply.

MIC LEVEL

PLUG

LECTROSONICS, INC.

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Lectrosonics UM500 User Manual Page 12

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