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Reed Relay Feedback Latch

IP.com Disclosure Number: IPCOM000097043D
Original Publication Date: 1962-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Arnold, BH: AUTHOR

Abstract

When a short input pulse is applied at either diode 1 or 2, a signal is transmitted via diode 3 to the base of NPN transistor 4 to turn it on. As current is drawn through primary winding 5, a voltage is induced in secondary winding 6. This tends to turn the transistor on harder. Both sets of reed contacts a, b close. Contact a completes a circuit to supply an output signal. Contact b establishes a hold or latch circuit, provided switch 7 is closed.

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Reed Relay Feedback Latch

When a short input pulse is applied at either diode 1 or 2, a signal is transmitted via diode 3 to the base of NPN transistor 4 to turn it on. As current is drawn through primary winding 5, a voltage is induced in secondary winding 6. This tends to turn the transistor on harder. Both sets of reed contacts a, b close. Contact a completes a circuit to supply an output signal. Contact b establishes a hold or latch circuit, provided switch 7 is closed.

When saturation of primary 5 occurs, voltage is no longer induced in secondary 6. Current through 5 starts to decrease and causes a voltage to be induced in secondary 6. This tends to turn the transistor off.

However, the latch circuit already established via contact b keeps contacts a, b operated until switch 7 is opened. Thus, a short or highspeed pulse is stored for later use.

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