Hydrophone amplifier with high input impedance, buffered output and buildin batteries - B1501

The B1501 amplifier has a very low noise level and a wide range of filtering possibilities so it can be used for both listening to very tiny signals and for handling very large signals.

This device was originally intended for stationary use in harsh climatic environments but it seams like it has become the best standard hydrophone amplifier also for laboratory use. It is the most versatile unit in our product line both for research and development and also for installation in equipment that does not require frequently access to the amplifiers internal controls. All controls are located inside the box to make the device more resistant to water.

The amplifier has a built-in power supply of 2 pcs. 9volt PP3 square batteries.
It may also be powered by an external 12 to 24Volt battery or a laboratory power supply.

The unit has a very low power consumption of approximately 12mAmp and the maximum operating time
is about 8 to 12 hours on a set of fully charged batteries.
With dry cell Alkaline 9volt batteries the operating time can be up to 48 for hours.

The device offers filters of low pass and high pass and a gain setting. The amplifier also provides variable input resistance and input capacitance so as to allow for filtering and/or damping of the transducer signal direct input terminal.
This is especially useful for the purpose of handling very large input signal levels such as explosions or large sea-waves.
The filter section provides a wide range of adjustments so as to emphasize on the frequency range special interest.

Description B1501

• Hydrophone Voltage Amplifier
  

• Very low noise. Extreme high input impedance
  

• Wide frequency bandwidth
  

• Includes Lowpass filter, Highpass filter, Gain control, Input impedance controls
  

• High Pass Filter for filtering off low-freq seawaves
  

• Water splash proof
  

• Intended for stationary use in rough invironments or for monitoring use in laboratory and research invironments
  

• variable input Resistance and capacitance to setup filtering and/or attenuation directly on the transducer input terminals
  

• special controls on the transducer input terminals in order to handle extremely high signals coming from picking up of underwater explosions or for filtering of heavy sea-waves
  

• buffered at the signal output and may drive very long cables up to 1000 meters
  

• BNC connectors In and Out
  

• build-in 2 pcs. 9Volt PP3 batteries. Low power consumption. It may also be powered by an external 12 to 24Volt battery or a laboratory supply
  

- Hydrophone voltage amplifier
- Very low noise. Extremely high input impedance
- Wide frequency bandwidth. Low power consumption
- Internal driven by 2pcs batteries 9volt PP3 square type
- Includes Low Pass
- Filter, High Pass Filter, Gain control, Input impedance control
- BNC connector in and out. Water splash proof
- Intended for stationary use in harsh climates and for laboratory purposes

Technical data B1501 :
Gain Control
Highpass Filters
Lowpass Filters
Frequency Range
Filter Rresponses
Input capacitance control range
Input Resistance control range
Relative Input Noise :

+10 +20 +30 +40 +50 +60dB
1Hz / 10 / 100+1k / 10k / 100kHz
22k / 45k / 90k / 180k / 360k / 1MHz
1Hz to 1MHz
2nd.order Low Pass and High Pass / RC network.
10pF / 1n / 3n3 / 10n / 33n / 100nF
10k / 100k / 1M / 10M / 100M / 1Giga ohm
<1uVolt rms @ 1kHz (bw=500Hz...8kHz)

Interior of the B1501

Operaters quick guide to B1501:
Hydrophone and Filter Amplifier:
Battery powered / Charge Voltage 24Volt
Batteries and Control Buttons


inside box

Low pass filter for anti-aliasing filtering:
2.nd order filter 12dB / October 6dB @ Frequency

High pass filter for filtering off low freq. seawaves:
1.st order filter 6dB / October -3dB @ Frequency
Used in conjunction with Input Resistance filter
will result in a 2.nd order high-pass filter.

Input Resistance:
Used to form a high-pass filter directly to the input terminals togetherwith Transducer capacitance TCcap
The cut-off freq. is equal to: 1 / (2 Pi x Rinp x TCcap.)

Input capacitance:
Used to form an input attennuator to handle very strong input signals
Attenuation occurs between the transducer kapsiteten and input kapsiteten
Attenuation is equal to: CINP / (CINP + TCcap.)

The thumbscrews are made of marine bronze which is resisant to seawater.
This box is only semi-waterproof. It will not be able to withstand water pressure.
Remove the top cover to gain access to set the controls.
Press down on the top cover to loosen and tighten the screws.

Batteries 2 pcs. 9volt NiMh type PP3
They contain about 200mAh and will last up to 10 hours on a single charge.
Charger 24Volt will take 5 hours to recharge the batteries ..
Keep batteries cool when not in use for extended periods.

Do not overcharge. Please recycle the batteries when they are worn out.
The device can in emergency run on 2pcs. 9 Volt dry cells like Alkaline batteries.
Remember to remove them after use. Dry batteries can if they are left in the device for a longer period eventually leak acid, and may spoil the amplifier completely. Dry cell batteries must not be recharged.

B1501 Hydrophone amplifier and cable driver with high- and low pass filters and buffered output. Two pcs. 9Volt square battery supply offers 18Volt supply and very high output signal level.

Designed for stationary use in rough climatic invironments or for building in into equipment which does not require frequently access to the amplifiers internal controls. All control buttons are placed inside the box in order to make the unit more watertight.

This unit is state of the art in hydrophone amplifying with extremely low noise and very high output signal level and cable driving capability.

B1501 Price euro € 1000,-