Now when the sync signal goes low the diode clamps the Base to -0.6V and discharges the capacitor, so when the signal goes high it produces a strong Base drive and the transistor maintains full output. With the diode in place the waveforms changed to this:. The transistor barely managed to get 2 pulses out before it became cut off. The capacitor quickly charged to -7.5V and stayed there, with positive pulses just reaching the Base turn on voltage of 0.6V. Without the diode the Base and Collector waveforms looked like this:.
to gather shellfish, marine plant specimens, etc. Websters New World Similar definitions A device consisting of a net attached to a frame, dragged along the bottom of a river, bay, etc. I simulated the sync circuit in LTspice with a 10V pulse waveform. noun dredges An apparatus for scooping or sucking up mud, sand, rocks, etc., as in deepening or clearing channels, harbors, etc. This will cause the capacitor to accumulate a negative charge, 'cutting off' the transistor with negative bias.
Without the diode the capacitor will charge up as Base current flows into the transistor when the signal goes high, but will have no discharge path (apart from the Vbe breakdown at ~-7.5V) when it goes low. Apart from protecting the Base from excessive negative voltage, the diode is necessary to provide equal charge and discharge paths for the coupling capacitor.
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