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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 |
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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 |
| Technical
Specifications |
| · |
Dimensions |
41 x
112 x 15 mm |
| · |
Supply |
+/-
12v DC @
20mA |
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Response |
40Hz
- 20kHz +/- 0.2dB |
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Noise |
-92dB
unweighted -87dB weighted |
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