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[OT] Adding volume control to electronic device
gray_wolf wrote:
Remember the old drive in movie theater speakers with the volume control?= Those were 70V system. 70V constant power going down the cable, each tap has a step-down transformer, then an L-pad (not a simple pot but a three element pad so the transformer always sees an 8 ohm load) and a crappy speaker. Because they were all parallel loads, if the main cable was shorted by someone driving away without removing the speaker, it would take all of them down. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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