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4071 Microphone
Amplifier
4072 Line Amplifier
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4071
Single Microphone Amplifier
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A single PCB
containing low noise microphone amplifier with adjustable
preset gain (20 - 70dB). High input impedance and low
output impedance, low input impedance is achieved with
a Lundahl LL1528 pcb mount transformer fitted to the
board.
Opto-coupled FETs (H11F1) are also an option on the
board providing post-transformer muting where this is
required. By muting the signal in this manner there
is no danger of the input stage overloading, even when
faded down, possibly therefore causing breakthrough.
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Stock
no. 01-115
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4071
Price: |
£27 |
| Technical
Specifications |
| · |
Dimensions |
41 x 112 x 25
mm (inc txfs) |
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Supply |
+/- 12v DC @ 12mA |
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Response |
40Hz - 20kHz +/- 0.1dB |
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Noise |
Total noise -122dB ref.
input
-52dB unweighted
-47dB weighted |
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4072
Line Amplifier
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A single PCB
with adjustable gain between 0 and 20 dB. The input
is electronically balanced, typically 50k ohm input
impedance, fully protected against line transients and
DC offsets.
The common mode rejection ratio (CMRR) is adjustable
but comes preset better than -70dB and should not normally
require adjustment.
The board output is low impedance, peak output being
+18dB on a dual 12v supply rail.
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| Stock
no. 01-120 |
4072
Price: |
£27
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| Technical
Specifications |
| · |
Dimensions |
41 x 112 x
15 mm |
| · |
Supply |
+/- 12v DC @ 20mA |
| · |
Response |
40Hz - 20kHz
+/- 0.2dB |
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Noise |
-92dB unweighted
-87dB weighted |
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