Breckland Scientific 2021 Catalogue

Sound & StandingWaves

Sound

a

1 MYLAR LOUDSPEAKER The Loudspeaker Unit contains an 87mm diameter 12W, 8 Ohm Mylar (waterproof) loudspeaker, with 4mm input sockets. The speaker cone is fully exposed which allows it to be used for a range of experiments apart from its normal use as a loudspeaker, for example: • Comparing different waveform inputs at low frequencies from a signal generator • Observing the motion of small polystyrene beads on the speaker cone at different frequencies – this can then introduce the kinetic theory of gases • Adding a small piece of sponge or foam to polystyrene beads allows demonstration of Brownian Motion • A thixotropic mixture can be poured onto the cone and standing waves observed (also works with coloured water) Cat No. Description Price Per SWA-205-100 Mylar Loudspeaker 36.90 ea. 2 DEMO LOUNDSPEAKER A 20W (max) 8 ohm impedance speaker of 125mm diamter mounted in a robust housing. Two 4mm sockets provide connection. Size: 230 x 180 x 100mm Cat No. Description Price Per SWA-215-100 Demo Loudspeaker 72.81 ea. 4 CRYSTAL MICROPHONE Provides an output of around 20mV with just the human voice Cat No. Description Price Per SWA-335-100 Crystal Microphone 31.60 ea. 5 MICROPHONE For use with an oscilloscope to demonstrate voice waveform. Crystal microphone mounted in a moulded plastic box . Impedance 1MW Size: 55 x 110 x 22mm Cat No. Description Price Per 6 AMPLIFIER- IPC An audio amplifier which can be used for a wide range of experiments and demonstrations. The unit is powered by any laboratory power supply (9-12V d.c). Signal input is via 4mm sockets on the front panel, which includes a volume control. Impedance is 500k ohms (approx.); as such the unit can be driven directly from a crystal microphone, signal generator, radio headphone output etc. The unit is internally protected against incorrect input voltage polarity. Signal output is from the internal loudspeaker or via 4mm output sockets, which allows amplified signals to be displayed on an oscilloscope or used to drive a separate speaker; a two- position switch is provided to select internal or external output. Cat No. Description Price Per SWA-230-100 Amplifier ea. 7 POWER AMPLIFIER WITH SPEAKER “A versatile 10W mono power amplifier unit with integral 12W, 8Ω waterproof Mylar loudspeaker (87mm diameter) and variable volume control. Input can be from a signal generator, other sound source or mobile phone, tablet etc. The speaker can also be used in isolation from the amplifier, if required. The unit requires a 9-12V power supply at 500mA, which can be from a standard lab power supply, via 4mm sockets, or from a d.c. plug top power supply. As well as using the internal speaker, a pair of 4mm sockets are available for output to an external speaker and a switch allows the internal speaker to be switched off – ideal for use with a Rubens’ tube. These output sockets also allow for connection to an oscilloscope for monitoring the signal. Music from a mobile phone, tablet etc. can be input via the 3.5mm jack socket on the front panel. Cat No. Description Price Per SWA-240-100 Power Amplifier with Speaker 58.05 ea. SWA-220-100 Microphone 43.46 ea. 3 MOUNTED LOUDSPEAKER Mounted on a base. 4W 8 Ohm Cat No. Description Price Per SWA-225-100 Loudspeaker 39.43 ea.

2

1

b

c

d

e

f

Demo Loudspeaker

Mylar Loudspeaker

4

3

g

h

i

j

k

Mounted Loudspeaker

Microphone

5

6

l

m

n

o

Microphone Unit

Amplifier - IPC

7

p

q

r

s

t

v

Power Amplifier With Speaker

w

407

www.brecklandscientific.co.uk T: 01785 227227 | sales@brec landscientific.co.uk | F: 01785 227444