RDL STRG1 Specifications

STICK-ON® SERIES

Model ST-RG1
Ramp Generator

ANYWHERE YOU NEED...

• Ramp Generator with 0 to 10 Volt Output

• Remote Control of RDL VCA Products

• Multiple VCA Remote Control Points

• Dual LED Outputs for Position Indication

• Ramp Output Capable of Driving Two VCAs

• Buffered, De-Bounced Switch Inputs

You Need The ST-RG1!

The ST-RG1 is a digitally generated 0 to 10 volt Ramp Generator in the group of STICK-ON series
products by Radio Design Labs. These products are designed for quick, convenient installation and
reliable operation in a variety of control applications.

APPLICATION: The ST-RG1 provides a 0 to 10 volt output is the ideal interface to remotely control
Voltage Controlled Amplifiers, such as RDL’s popular VCA Modules. A single VCA may now be controlled
from several locations. Only a pair of buttons (UP and DOWN) is required at each control location, or
RDL’s RLC2 Remote Level Control. LED level indicator driver circuitry is included in the ST-RG1.

The ST-RG1 provides terminals for connection of two momentary buttons; one to ramp up, the other to
ramp down. This is usually accomplished with RDL’s RLC2 Remote Level Control. When power is applied
to the ST-RG1, the output terminal is at its lowest (0 volt) point. When the UP button is pushed, the
output ramps upward. When the UP button is released, the output remains stable at the voltage present
when the button was released. When the DOWN button is depressed, the output ramps downward as
long as the button is held in. When the ST-RG1 output reaches either minimum or maximum, it remains
there until the opposite button (or closure) is applied. If the remote button is pushed momentarily and not
held in, the ramp will step 200 millivolts nominal in the selected direction.

Two LED outputs are provided. A red LED connects to the LOW output; a green connects to the HIGH
output. When the ramp is fully on (10 volts), the HIGH indicator is fully on, and the LOW is fully off. When
the ramp is at minimum, the LOW is fully on and the HIGH is fully off. The circuit is designed to vary the
current to each LED in proportion to the relative position of the ramp. If the ramp is at 5 volts then both
indicators are equally illuminated. With this system, only two LEDs are required for full visual level
indication!

The ST-RG1 provides the ideal interface for audio volume control through RDL VCA Modules. The
ST-RG1 is a ground-referenced product, which may operate from the same power supply as the RDL
VCA modules. Any number of UP and DOWN buttons may be connected to the ST-RG1, allowing VCA
control from multiple locations. The output drive current from the ST-RG1 is more than sufficient to drive
two monaural RDL VCA Modules for stereo applications.

All this is available in the unbelievable compactness and convenience of the RDL STICK-ONs. Put them
right where you need them, or design them in with our optional racking or mounting kits. Anytime you
need a 0 to 10 volt ramp generator, your simple, cost-effective solution is found in the ST-RG1!

RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• [phone] •• FAX [phone] •• http://www.rdlnet.com

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287

STICK-ON® SERIES

Model ST-RG1
Ramp Generator

UP TO 15

ADDITIONAL

RLC2'S

+24V

UP
RAMP

DOWN
GND

RDL

RLC2

CONNECTING ST-RG1 TO RDL'S RLC2s

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

RAMP GENERATOR

CONTROL

DOWN LOW

0 TO 10 VDC RAMP OUTPUT

LEVEL LED

HIGHUP

RAMP POWER

AMP GENERATOR

TO 10 VDC RAMP OUTPUT

EVEL LED

LOW

RAMP POWER

24 VDC

POWER

SOURCE

LINE

N

10V

C
T

O

R

U

L

T

CONNECTING ST-RG1
TO CONTROL UP TO
SIX RDL ST-VCA2'S

PWR INOUTPUT

V
E
L

L

E

CONTROL

DOWN LOW

CONNECTING THE ST-RG1 TO
DISCRETE SWITCHES AND LED'S

RAMP GENERATOR

0 TO 10 VDC RAMP OUTPUT

LEVEL LED

HIGHUP

Green

LED

Red
LED

RAMP POWER

24 VDC

POWER

SOURCE

TYPICAL PERFORMANCE

Control Inputs: 1 to ramp up, 1 to ramp down
Input Logic: External closure pulls normally low input to +15 Vdc
to activate up or down function
Indicator Outputs: 1 to drive low LED, partial to fully Off
1 to drive high LED partial to fully On
LED Output Current: 0 to 3 mA (to drive low current, high intensity LEDs)
Ramp Output: 0 to 10 Volts nominal, (typical < 0.1 V to > 9.8 V under ST-VCA1 load)
Minimum Step: 200 mV nominal
Ramp Time: 5 seconds (fully off to fully on; or fully on to fully off)
Power Requirement: 24 to 33 Vdc @ 40 mA, Ground-referenced

Radio Design Labs Technical Support Centers

891-0021I

U.S.A. [phone], [phone]; Fax: [phone]