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Transistors to Tube Conversion Circuit

IP.com Disclosure Number: IPCOM000094609D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Delanoy, RL: AUTHOR [+2]

Abstract

The circuit accepts signals, the levels of which are suitable for driving transistor circuits. The circuit produces output signals the levels of which are suitable for driving vacuum tube circuits.

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Transistors to Tube Conversion Circuit

The circuit accepts signals, the levels of which are suitable for driving transistor circuits. The circuit produces output signals the levels of which are suitable for driving vacuum tube circuits.

The circuit includes grounded emitter driving transistor 1, the collector electrode of which is connected to the gate electrode of silicon-controlled rectifier 2 by way of zener diode 3. Diode 3, collector return resistor 4, and base bias resistor 5 form a voltage divider network which normally maintains rectifier 2 in its nonconducting state.

When transistor 1 is operated in saturation by an input pulse at its base, diode 3 assures a sufficiently positive voltage level at the gate electrode to turn rectifier 2 on. When this is turned on, its output level is ground potential. When it is off, the output potential is +150 volts.

Preferably, 2 is a gate-turnoff rectifier so that removal of the input signal from transistor 1 turns the latter off which, in turn, causes rectifier 2 to be turned off. If rectifier 2 is of the type that cannot be turned off by a suitable level at its gate electrode, its anode circuit current is reduced below the holding current level to turn rectifier 2 off.

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