Rolls DB24 Introduction, Description, Front Panel, Connection / Operation, Schematic, Rear Panel

INTRODUCTION

Thank you for purchasing the DB24 Stereo Direct Interface. This sturdy device is designed and manufactured to the most demanding specifications in order to provide years of faithful survice. The DB24 converts high impedance audio signals to low impedance via Rolls proprietary audio transformers, and a variety of inputs.

DESCRIPTION

FRONT PANEL

		-35			DB24
					-35
	-50	-25		-50	-25
	-60	-20	St.	-60	-20
L. Ster	Left			Right		R. Mon
	Level		IN	Level

-L.Ster: 1/4" Tip-Ring-Sleeve jack for connection to a "Left" portion of a signal, or a Tip-Ring-Sleeve "Stereo" signal.

-Left Level: Adjusts the input level to the Left channel.

-L & R: Stereo RCA jacks, for connection to an unbalanced stereo signal. Note: The Right and Left jacks may be used individually as well.

NOTE: The Red RCA jack connects to the Right Out, and the White RCA jack connects to the Left Out.

-St. IN: 1/8" (3.5mm) Tip-Ring-Sleeve jack for connection to an unbalanced Stereo signal only.

-Right Level: Adjusts the input level to the Right channel.

-R. Mon: 1/4" Tip Sleeve jack for connection to the "Right" portion of a stereo signal, or to a "Mono" signal.

CONNECTION / OPERATION

1/4" Jacks: Stereo Operation:

A. Individual Right and Left connections - Connect Tip-Sleeve 1/4" plugs to the Right and Left Input jacks.

B. Stereo Tip-Ring-Sleeve connection - Connect a Tip-Ring-Sleeve 1/4" plug to the Left/Stereo Input jack. IMPORTANT NOTE: Connecting a Tip-Sleeve MONO plug into this jack, with nothing connected to the Right/Mono Input will result in the Right/Mono Input being shorted to ground.

1/4" Jack: Mono Operation: Connect a Tip-Sleeve Mono plug to the Right/Mono Input.

1/8" (3.5mm) Jack: Connect a Tip-Ring-Sleeve stereo plug into this jack for stereo

operation only. NOTE: Connecting a Tip-Sleeve MONO plug into this jack, with nothing connected to the Right/Mono 1/4" Input will result in the Right/Mono Input being shorted to ground.

RCA Jacks: Connect Stereo RCA plugs into these jacks for stereo or dual-mono operation.

Connect XLR outputs to the next device in your signal chain.

Adjust the Right and Left Level controls for an appropriate input level. For ex- ample, for maximum amount of attenuation (least amount of signal), turn the Level control to -60. For minimum attenuation (maximum signal), turn the Level control up to -20.

SCHEMATIC

REAR PANEL

mono stereo	OUT	OUT	gnd lift
	LEFT	RIGHT

-

- Stereo/Mono When in stereo the units left and right are separet. When in Mono

The left and right inputs are combined together. In mono mode you can plug a single

left or right input into the DB24 and you will get output from both left and right.

	J3
	PHONE 1/4		P1
LEFT/STEREO				R5	470
			P100K
				R1
				10K
		2	R2
J4A			1K
				2	3
		1
RCAX2 PC
INPUTS	3
J5			P2		1
		JK3.5ST		R6 470
			P100K	R4
				10K

J6

PHONE 1/4

RIGHT/MONO	R3
	1K

TR1
		2
	3
PN829	J1
XLR JACK M		1	OUTPUT
SPST
SW1
MONO/STEREO
TR2
20K X 600 ohm
		2
	3
PN829	J2
		1
XLR JACK M
		1
			SW2
GROUND/LIFT			SPST
	3		2

- Ground Lift (Labeled "gnd/lift"): When positioned to the side of the switch labeled

"lift", the shield of the XLR plug is separated from the ground pin (pin 1).

- Left/Right OUT: Balanced XLR jacks - for connection to mixer inputs, amplifiers,

etc. This will effect both left and right channels.

Rolls Corporation

	5968 So 350 West
	Murray	Utah 84107
DB24 STEREO DIRECT INTERFACE
	Document Number:		Rev:
Ba		DB24.SCH	A
Date: 25 JUNE 2010		Sheet 1	of 1