zero voltage indicator

.... whether the input voltage lies within a spec small voltage range, which is symmetrical about zero If the voltage is within the range, the LED"s flash. If it is outside, one of them lights continuously. Within the specified range there is also an indication of whether the voltage is at the edge of the range re ear thecentre (ie near to zero). At the cent of nthe range the LED"s flash regularly, but towards the voltage fed back to C1 is no longer and D2). If supply voltage. (It is also limited by D1 C R5 is not now connected to earth, but to a Dhe edges they become irregular. hysteresis loop h stops oscillating and one of the LED"s lights con- 1 R5 R7 tinuously. If the input voltage is exactly 0 volts, then the DC level across C1 is zero, and the LED"s will flash regularly. However, if the input is not exactly 0 volts, leg slightly positive), then one LED (D2) will be on slightly longer than the other. mV, fie the D2 15 zerovoltage • ® 81532-2 indicator tic, The operation of...