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JACK SCHEMATICS

click here to download a schematic drawing (Jack Schematics 1-15)

click here to download a schematic drawing (Jack Schematics 16-39)

(you will need to have Adobe Acrobat installed on your system to do this)

Circuit Types: Jacks normally have through circuits, shunt circuits, and/or isolated switching circuits, either individually or in various combinations. The chart below shows schematics of 39 common jacks - many more combinations are possible, but these are the most commonly used. A basic description of the switching action of each jack accompanies each schematic.
Military Identification: Military specifications covering phone jacks use a special code to describe jack functions. Jack schematic descriptions are coded J-1 through J-13 (as appropriate) to coincide with Federal Item Identification Guides for Supply Cataloging. One or more groups of suffix numbers/letters identify isolated switching circuits used. Suffixes identify the switching by industry recognized notation, i.e., 1-A, 1-B, 1-C, 1-D, etc. See chart below.

Notation
Meaning

1-A
One, SPST switching circuit. Also known as NO (normally open) or "make" circuit.

1-B
One, SPST switching circuit. Also known as NC (normally closed) or "break" circuit.

1-C
One, SPDT switching circuit. Also known as transfer or "break" before "make" circuit.

1-D One, SPDT switching circuit. Also known as "make" before "break" circuit.

NOTE: Number indicates the quantity of circuit - 2-A means 2, A circuits. Terminals locations shown on jack schematics do not necessarily coincide with physical locations on jacks. Not all circuit types available on all jacks.

Switchcraft can build complete Jack Panel Assemblies with jacks, lamp jacks and switches with wire-wrapping terminals. If desired, components with solder lugs and wire-wrapping terminals can be installed in the same assembly.
WIRE-WRAPPING TERMINAL DESIGN
Jack springs with integral wire-wrapping terminals are made of special copper alloy for maximum work-life with excellent resistance to corrosion. Shank of terminal accommodates a maximum of three wire connections. Tini-Telephone® phone jacks, lamp jacks and switches with wire-wrapping terminals have slightly higher stack due to greater spacing required for wrapping tool access. Actuator springs and ground lug terminals are .704 inches long by .060 inches wide.
WIRE-WRAPPING CONNECTIONS
Use the chart below as a guide to recommended tools to be used with varying terminal thickness and wire gauges.

Recommended Wire-Wrapping Tool
(Gardner-Denver Co. Part Numbers)

Terminal Thickness (Inches) Wire Gauge Use with 14B1-A Wrapping Bit Wrapping Tool Sleeve

.020 thru .032 22 & 24
500131 18840

.016 24 500131
18840

.016 thru .032 26 37006 17611-2

SPECIFYING NOTE: Due to assembly variations containing components (solder lugs, wire-wrapping terminals, or both), these Jack Panel Assemblies are available on special order only. Contact Switchcraft.

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Notation	Meaning
1-A	One, SPST switching circuit. Also known as NO (normally open) or "make" circuit.
1-B	One, SPST switching circuit. Also known as NC (normally closed) or "break" circuit.
1-C	One, SPDT switching circuit. Also known as transfer or "break" before "make" circuit.
1-D	One, SPDT switching circuit. Also known as "make" before "break" circuit.
NOTE: Number indicates the quantity of circuit - 2-A means 2, A circuits. Terminals locations shown on jack schematics do not necessarily coincide with physical locations on jacks. Not all circuit types available on all jacks.

		Recommended Wire-Wrapping Tool (Gardner-Denver Co. Part Numbers)
Terminal Thickness (Inches)	Wire Gauge	Use with 14B1-A Wrapping Bit	Wrapping Tool Sleeve
.020 thru .032	22 & 24	500131	18840
.016	24	500131	18840
.016 thru .032	26	37006	17611-2
SPECIFYING NOTE: Due to assembly variations containing components (solder lugs, wire-wrapping terminals, or both), these Jack Panel Assemblies are available on special order only. Contact Switchcraft.