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555: Difference between revisions
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added info on shunting resistors in powersupply
m (Expanded Power supply/Filament Regulation Section) |
m (added info on shunting resistors in powersupply) |
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2. The Primary of the plate voltage transformer inside the power supply unit is looped via the thermal cutout in the indicator unit. So the plate voltage transformer in the power supply will not get power unless the indicator unit is attached. | 2. The Primary of the plate voltage transformer inside the power supply unit is looped via the thermal cutout in the indicator unit. So the plate voltage transformer in the power supply will not get power unless the indicator unit is attached. | ||
Even if you try to power up power supply itself by bypassing the thermal cut-out and applying local heater voltages to the tubes which gets heater voltage from indicator unit, the power supply will not regulate as the design employs shunting resistors across the series pass tubes. Hence without load, it will not be able to provide regulation. | |||