Vibrating Membrane with Strobe (C37) [3D40.40]

Oscillations - Standing Waves

Description

An Oscillator signal is used to excite vibrational modes in a thin circular rubber membrane. The modes can be viewed with a strobe light.

Materials

• Bogen Audio Amplifier
• Conrad oscillator
• Strobe-o tach
• Radio Shack woofer (10”)
• 2 BNC cables
• BNC tee
• BNC female - microphone male adapter
• Membrane assembly

• Membrane
• 2 annului (wood, painted black)
• 6 C-clamps

• 2 ringstands
• Wood black for strobe
• 2 right angle clamps
• 2 grip clamps
• BNC twin alligator clips cable

Row X

Instructions

Assembly:

1. Rubber must be replaced approximately once every 10 years.
2. Rubber assembly should be stored without 6 C-clamps in order to rest the membrane. Pull the rubber taut, and tighten 6 C-clamps around rings as shown
3. Clamp assembly to ring stands
4. Place strobe on wood block. DIrect light toward membrane
5. Plug BNC-MIC adapter into “input” of strobe
6. Put tee on oscillator output
7. Connect oscillator output to BOGEN input aux 1 and strobe input with 2 BNC cables.
8. Connect Bogen output to speaker with BNC-clip lead cable

Operation:

1. Turn on amplifier, oscillator, strobe
2. Turn up oscillator output all the way
3. Turn gain on amplifier below speaker destruction point
4. Set stroke for external input
5. Strobe should now be firing in sync, with the oscillator

Other

Tags: 8.03, Standing Waves