Lectrosonics UM190b User Manual download pdf (Page 10)

RF BYPASSING

2 WIRE MIC 3 WIRE MIC

Some mics require RF protection to keep the radio signal

from affecting the capsule, even though the transmitter

input circuitry is already RF bypassed (see schematic

diagram).

If the mic is wired as directed, and you are having

difficulty with squealing, high noise, or poor frequency

response; RF is likely to be the cause.

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 wires inside the TA5F connector

housing.

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 lavalier mics are already bypassed and do not need any additional capacitors installed for proper

operation.

BODY GROUND

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

distortion.

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

distortion.

WIRING HOOKUPS FOR DIFFERENT SOURCES

CAPSULE

SHIELD

AUDIO

SHIELD

AUDIO

BIAS

TA5F

CONNECTOR

TA5F

CONNECTO

Preferred locations for bypass capacitors

Alternate locations for bypass capacitors

SHIELD

AUDIO

BIAS

3 WIRE ELECTRET MIC

POSITIVE BIAS

SHIELD

AUDIO

2 WIRE ELECTRET MIC

NEGATIVE BIAS

TA5F

PLUG

SLEEVE

SHIELD

AUDIO

2 WIRE ELECTRET MIC

POSITIVE BIAS

SHIELD

TIP

AUDIO

LINE LEVEL

TA5F

RCA or 1/4 " PLUG

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

1 2 ... 5 6 7 8 9 10 11 12 13 14

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Lectrosonics UM190b User Manual Page 10

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