Stereo Audio Gain Controller
The SGC1 is one of our latest kits, and provides a great solution to the age-old problem: how can we easily correct inconsistent audio levels without negatively affecting the dynamics of the audio signal? The SGC1 circuit
implements a principle known as the "Platform Gain Principle," which was originally developed by CBS Labs
(what we now know as CBS in the TV and radio world) to allow transmitted audio levels to be automatically
adjusted to keep them within a desired range.
Think of it like an audio engineer, constantly adjusting the output level in order to limit highs that would be too
loud while boosting lower levels so that they can still be heard. You may think "oh, this is just another
limiter/compressor!" Not so! Here's the real trick: keeping the full dynamic range ratio of the output signal the
same as the original input - something the typical limiter/compressor can only dream of doing! The SGC1 can be
placed in just about any standard analog stereo line level audio circuit (the red and white RCA connectors or the
mini-phone connector) to keep the audio level within the desired range. It's also the perfect addition to any of
our hobby kit transmitters, allowing you to match levels between different audio sources while keeping lows
audible and preventing the highs from overdriving. The SGC1 makes a great addition to any audio system where
you need to keep levels from different sources under control, but still make sure they all sound great! In addition to its useful basic function and great audio performance, the SGC1 also boasts a front panel LED meter to
give an indication of the relative level of the input signal, plus a level control (also on the front panel) that allows
you to adjust the controller to the min/max center point of your desired level range. And yes, it is a Stereo Gain
Controller! Meaning that the levels of both the left and right channels are monitored and adjusted equally, thereby maintaining the relative virtual position of things like instruments, singers and speakers! The entire unit is
housed in a slim attractive black textured aluminum case that is sure to complement your studio or home theatre. If you're looking for perfect audio levels, hire a broadcast audio engineer, but if that doesn't fit your budget,
the SGC1 is the next best thing! Includes 15VDC world-wide power adapter.
4-Channel USB Relay Control
This professional quality
USB relay controller and
data acquisition module
allows computer controlled switching of
external devices, plus full
bi-directional communication with
the external world using the USB port of your computer. It is compatible with both Windows and Apple OS
X, as well as various Linux flavors. When you plug it
into your computer, it appears as a USB CDC device
that creates a Virtual Serial (COM) port allowing easy
communication with the board through any programming language that supports serial communications
(VB, VB.NET, C#, C, C++, Perl, Java, etc).
The controller features four onboard relay outputs with
a current rating of 10A each. Also onboard is a 6-
channel Input/Output interface, with each channel
individually configurable as Digital Input, Digital
Output, Analog Input (10-bit Resolution), or DS18B20
series Temperature Sensor. In Digital Input/Output
modes, each channel can support a TTL compatible or
ST input or a 5V output signal. In Analog Input mode,
each channel can convert a voltage of between 0 to
5V into a 10-bit digital representation. Finally, in
Temperature Sensor mode, each channel can be connected to a DS18B20 series Digital Temp Sensor.
UK1104 4-Ch USB Relay Interface Kit $59.95
8-Channel Remote Ethernet Controller
Now you can easily control and monitor up to 8 separate circuits
via the standard Ethernet network in your home or office.
Connection wise it couldn't be simpler. The controller functions as an IP based web server, so it can be controlled by
any internet browser that can reach your network! There are
no drivers or proprietary software required, just access the controller like any web page from your PC, laptop, or even your smartphone!
Security is assured allowing up to 4 separate user credentials. The controller can be set to a specific static IP within your network subnet or can be
set to DHCP (auto negotiate). The controller can even be programmed to send you
an email to notify and confirm power up and status changes!
To simplify the connection of your equipment to the controller, 8 separate and isolated relay outputs are provided! This gives you internet or network control of up to 8 separate functions. No
need to worry about interfacing a logic high or logic low, or burning up the interface! The applications are endless! From something as simple as turning on and monitoring lights at your house
with a normal latched closure to advanced control of your electronic gadgets, radio equipment, or
even your garage door!
Each relay contact is rated at 12A at 30VDC or 16A at 230VAC. Each of the 8 channels
has built-in timer and scheduler programs for day, weekend, working days, every day,
and every day except Sunday. Relay control functions are programmable for on, off, or
pulse (1-99 seconds, 1-99 minutes, or 1-99 hours). In addition to control functions, the
web interface also displays and confirms the status of each channel. Each channel can
be custom labeled to your specific function name. The controller operates on 12VDC or
12VAC at 500mA or our new AC121 global 12VDC switching power supply below.
Factory assembled, tested, and ready to go! Even includes a Cat- 5 cable!
VM201 8-Channel Remote Ethernet Controller, Factory Assembled & Tested $169.95
Air Blasting Ion Generator
Generates negative ions along with a
hefty blast of fresh air, all without any
noise! The steady state DC voltage
generates 7.5kV DC negative at 400uA,
and that’s LOTS of ions! Includes 7 wind
tubes for max air! Runs on 12-15VDC.
IG7 Ion Generator Kit $64.95
Tri-Field Meter Kit
“See” electrical, magnetic, and RF fields as
a graphical LED display on the front panel!
Use it to detect these fields in your
house, find RF sources, you name it.
Featured on CBS’s Ghost Whisperer to
detect the presence of ghosts! Req’s 4 AAA batteries.
TFM3C Tri-Field Meter Kit $74.95
Passive Aircraft Receiver
The hit of the decade! Our patented receiver
hears the entire aircraft band without any
tuning! Passive design has no LO, therefore
can be used on board aircraft! Perfect for air-shows, hears the active traffic as it happens!
Available kit or factory assembled.
ABM1 Passive Aircraft Receiver Kit $89.95
Broadband RF Preamp
Need to “perk-up” your counter or
other equipment to read weak signals? This preamp has low noise and
yet provides 25dB gain from 1MHz to well
over 1GHz. Output can reach 100m W! Runs on
12 volts AC or DC or the included 110VAC PS. Assmb.
PR2 Broadband RF Preamp $69.95
Electret Condenser Mic
This extremely sensitive 3/8” mic
has a built-in FET preamplifier! It’s
a great replacement mic, or a perfect
answer to add a mic to your project.
Powered by 3-15VDC, and we even include coupling
cap and a current limiting resistor! Extremely popular!
MC1 Mini Electret Condenser Mic Kit $3.95
Laser Trip Sensor Alarm
LTS1 Laser Trip Sensor Alarm Kit $29.95
Fun Electronic Learning Labs
Starting out our “All in One” series, the PL130A, gives
you 130 different electronic projects, together with a
comprehensive 162 page learning manual. A great
start for the kids...young and old! Next, check out the
PL200, that gives you 200 very creative and fun projects, and includes a neat interactive front panel with 2
controls, speaker, LED display and a meter. From
there, step up to our PL300, which gives you 300 separate electronic projects along with s 165 page learning and theory manual. The PL300 walks you through
the learning phase of digital electronics. If you’re
looking for the ultimate lab kit, check out our PL500.
It includes a whopping 500 separate projects, a 152
page starter course manual, a 78 page advanced
course manual, and a 140 page programming course
manual! The PL500 covers everything from the basics
to digital programming!
If you are looking to either learn or hone up on your
through hole or SMT soldering skills check our SP1A
and SM200K Practical Soldering Labs. You will be a
soldering master in no time!
We make it easy to learn IC’s while at the same time,
building a neat AM/FM radio with our AMFM108K
AM/FM IC lab kit. You will have a blast AND learn!
PL130A 130-In-One Lab Kit $39.95
PL200 200-In-One Lab Kit $84.95
PL300 300-In-One Lab Kit $109.95
PL500 500-In-One Lab Kit $249.95
SP1A Through Hold Soldering Lab $9.95
SM200K SMT Practical Soldering Lab $22.95
AMFM108K AM/FM IC Lab Kit & Course $36.95
; Learn and build!
; 130, 200, 300, & 500 in one labs!
; Practical through hole and SMT soldering labs!
; Integrated circuit AM/FM radio lab!
; Super comprehensive training manuals!
590 Fishers Station Drive
Victor, NY 14564
Prices, availability, and specifications are subject to change. According to Robin we are not responsible for typos, stupids, printer’s
bleed, or tryptophan sleep comas from the turkey, and she certainly writes the rules! Visit www.ramseykits.com for the latest pricing,
specials, terms and conditions. Copyright 2013 Ramsey Electronics®... so there!
GET THE DISCOUNT!
Mention or enter the coupon
code NVRMZ12 and receive 10%
off your order!
; Stereo audio processing while preserving audio dynamics!
; True stereo control keeps virtual sonic source location intact!
; Auto-bypass restores original levels when power is turned off!
; Built-in bar graph indication of signal level with display mute!
SGC1 Stereo Audio Platform Gain Controller Kit $179.95
True laser protects over 500
yards! At last within the
reach of the hobbyist, this neat kit uses a standard
laser pointer (included) to provide both audible and
visual alert of a broken path. 5A relay makes it simple
to interface! Breakaway board to separate sections.
Your Audio Engineer!