Amplifier and Enclosure Kit for LASERBEAM-DUAL Filter Modules (DSP module included) - (BOXA-DUAL)
Also available built:- DSP Audio Filter Unit
The popular LASERBEAM-DUAL filters are ideal for incorporating into your own designs. However, for additional flexibility we have designed this great amplifier/enclosure kit which will allow your LASERBEAM-DUAL filter module (included) to be used with all your favourite radios. It has a professional look to compliment your shack.
The BOXA-DUAL kit consists of a PCB that the filter module (included) will plug into, together with an audio amplifier. The front panel features the CW Tuning LED (Sig) and Overload LED (Lvl) as well as a bandwidth switch (W/N) and volume control (Vol). The rear panel has 3.5 mm stereo sockets for audio in and out as well as a power socket for a DC supply (5-15 Volts).
As supplied, the board will drive headphones or a small loudspeaker. By changing two resistors, audio output can be increased up to 1.5 Watts which will drive loudspeaker. Because the filter module is a plug-in unit you can swap between different LASERBEAM-DUAL modules depending on your application.
The BOXA-DUAL enclosure has laser-cut gold-effect panels which screw into a rugged aluminium case. Power input is via 2.1 mm power socket (plug supplied).
The kit uses all through-hole components and is an easy build for a beginner. Build time about 40 minutes. Click here for instructions.
Note that the filter modules are bandpass filters only, so will not do anything about noise inside the passband. However, they should be very effective at eliminating noise and signals outside the passband. They will make the biggest difference to older or simpler radios that do not already have advanced DSP filtering on the audio output.
Optional Extras:
A 3.5 mm to 3.5 mm jack to jack lead might be handy. Click here.
Cable for your power lead could be useful. Click here.
A 3.5mm mono to 3.5mm stereo adapter is required to connect speakers or headphones with a mono plug to this unit, which has a stereo output (plugging in a 3.5mm mono plug without an adapter will cause a short circuit and reduced audio output volume). Click here
If powering this filter from the same power supply as your radio, you may need a ground loop isolator. Click here.
Specifications:
Size: 85 x 63 x 30 mm
Weight: 136 grams
Supply Voltage: 6 - 15 Volts (minimum supply voltage increased to 6V as of early 2022 due to component changes, was originally 5V minimum)
Current: 70 mA - using headphones
Power output: 1.5 Watts maximum into 8 Ohms (maximum depends on internal resistor values)
Also available from our international agent(s):
