Cooper Wheelock SALL15S

The Cooper Wheelock SALL-15S self amplified speaker control/signal circuit module provides audio output for the SAFEPATH system. The circuit module has a -5 dBm, 15 ohm audio output, a 24VDC, 2A speaker amplifier power output, and a 24VDC, 2A strobe output. The circuit module contains a linear amplifier and supervision circuitry.

The circuit module supervises the strobe field wiring, the speaker amplifier audio field wiring, the speaker amplifier power field wiring, and the amplifier. The strobe field wiring and the speaker amplifier power wiring are supervised with a reverse polarity technique, which applies a DC voltage with one polarity to supervise the wiring and then reverses the polarity to energize the strobes. The speaker amplifier audio field wiring is supervised with a DC current which is removed when audio is being played. Both field wiring circuits are only supervised in the standby state. The amplifier is supervised by monitoring the amplifier output for audio. The state of each of the four supervision features is indicated via four indicators on the printed circuit board.






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