DIY Components
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This set of components will give good results for a 100 foot Audio loop, which is enough to accommodate about 30 people in a typical meeting room.
Power Amplifier
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Radio Shack 40 W Public Address Amplifier 32-2002
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129.99
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Loop Cable
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100 feet, 4 conductor, 20 gauge, stranded, non-shielded
Mouser catalog # 602-1896/4C-100
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25.97
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Connectors
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Four position trailer wiring - Hoppy 48245, available at Walmart
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9.97
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Microphones (2)
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Radio Shack # 33-3021
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39.98*
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Microphone cables (2)
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RS catalog # 42-2378
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9.98
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Carrying Case
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I found an aluminum "briefcase style" at Lowe's.
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25.00
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Total Cost:
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$240.89
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* These mikes are sometimes on sale for about $10 each, and the PA amp is sometimes on sale.
The PA amplifier specified above has two input jacks for 1/4" microphone plugs and the amp does not supply phantom power. Therefore, microphones must be the dynamic type with a 1/4" plug or electret microphones, such as lapel mics, can be used if they contain their own battery. Small electret mics usually have a 1/8 " plug, so an adapter must be used for the 1/4 " jacks. The amp also has an "aux" input with an RCA type jack. Patch cables used on VCR and TV equipment fit this kind of jack, and a TV, VCR, or DVD player can be used as an input source.
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