Microphone Box (115 V, 50/60 Hz)

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Application:_..

This universal dual-channel amplifier is part of experiments for determining the speed of sound (item no: 8000566 and 8000568) and is required accessory for Kundt's Tube E (item no: 1017339). The microphone box is used here together with the microphone probe (long), the microphone probe (short), and the microsecond counter.

Product Information:_..

The microphone box is a universal, dual-channel amplifier for electret microphones with a band width of 10 Hz to 40 kHz. Both channels (A und B) can be switched between Signal, Level and Trigger modes. The sensitivity of the pre-amp is adjustable and allows measuring instruments and oscilloscopes to be connected directly. The threshold for the trigger is also adjustable. The microphone box is particularly suitable for use with long and short microphone probes and the microsecond counter in order to carry out experiments on the speed of sound.

Specifications:_..

Channels:	2 separate channels for electret microphones
Output signal:	switchable between Signal, Level and Pulse

Signal:	0 - 14 Vpp max.
Level:	0 - 7 V DC max.
Puls	low: 0 V, High: 8 V DC; length: 150 ms

Output impedance:	1 kΩ
Gain:	20x to 70x
Band width:	10 Hz to 42 kHz

Sensitivity using microphone (item no: 4008308):	800 mVpp approx. at 80 dB noise level, 1 kHz and minimum gain
Sensitivity using microphone (item no: 4008308):	2.5 Vpp approx. at 90 dB noise level, 1 kHz and minimum gain

General technical data:
Inputs:	3.5 mm jack plugs
Outputs:	BNC socket
Voltage supply:	via plug-in power supply 12 V AC, 500 mA
Dimensions:	100 mm x 75 mm x 35 mm approx.
Weight:	450 g approx. incl. plug-in power supply

Contents:_..

1	Microphone box
1	Plug-in power supply 12 V AC
1	Instruction sheet