This was rather spectacularly demonstrated in one incident. We were making a street announcement of an upcoming concert, slowly cruising in a Jeep while using its battery to power the P.A. amplifier. The positive chassis of the amplifier came in contact with the Jeep's negative body, causing a short circuit. Sparks flew for a couple of seconds before I realised what was happening and pulled the amplifier away.Intersting detail. Indeed all the circuit seems to be "+ suplly" referenced,
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