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Stereo Audio Platform Gain Controller
SGC1 Stereo Audio Platform Gain Controller Kit
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 worldwide power adapter.
; 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!
; Unbalanced RCA and 3.5mm stereo input and output line level jacks!
; Built-in bar graph indication of signal level with display mute!
Entry Test Set
Just like the days of "plugs,
points, and condenser" are
over, so are the days of having
the hardware store grind
out a spare key for your
Now when your keyless
access system doesn't work,
you need to accurately detect what part of the system
is malfunctioning. This could be anything from a dead
battery in the key fob, a "brain-dead" key fob, to malfunctioning sensors, antennas, or other system components in the vehicle. Until now there was no way to
determine where the system was failing.
Testing your system is easy. To test the complete 125
kHz/315 MHz communications path just stand close to
the vehicle with the WCT3 and your key fob in hand.
Press the test button and the WCT3 will detect and
display the presence of the vehicle's 125kHz/20KHz
signal and, if they "handshake", will also detect and
display the presence of your key fob's 315MHz return
signal. You can independently test key fob only signals (panic, lock, trunk, etc.) by holding the key fob
near the WCT3, pressing the test button, and pushing
the function button on the key fob.
The same functionality testing can be done with IR key
fobs. The modulated IR signal is detected and will
illuminate the IR test LED on the test set.
If you know a few "secrets" you can also see if the tire
pressure sensors/transmitters are generating signals or
the built-in garage door opener in your rear view mirror is transmitting a signal! Runs on a standard 9V
battery. Also available factory assembled & tested.
$179.95 WCT3 Keyless Entry Test Set Kit $59.95
Electrocardiogram ECG Heart Monitor
Use the ECG1C to astound your physician with your knowledge of ECG/EKG systems.
Enjoy learning about the inner workings of the heart while, at the same time, covering the
stage-by-stage electronic circuit theory used in the kit to monitor it. The documentation with
the ECG1C covers everything from the circuit description of the kit to the circuit description of
the heart! Multiple “beat” indicators include a bright front panel LED that flashes with the
actions of the heart along with an adjustable level audio speaker output that supports both
mono and stereo hook-ups. In addition, a monitor output is provided to connect to any standard oscilloscope to
view the traditional style ECG/EKG waveforms just like you see on ER... or in the ER! 10 hospital grade re-usable
probe patches are included together with the matching custom case set shown. Safe 9V battery operation.
ECG1C Electrocardiogram Heart Monitor Kit With Case & Patches $44.95
ECG1WT Electrocardiogram Heart Monitor, Factory Assembled & Tested $89.95
ECGP10 Electrocardiogram Re-Usable Probe Patches, 10-Pack $4.95
; Visible and audible display of your heart rhythm!
; Bright LED “Beat” indicator for easy viewing!
; Re-usable hospital grade sensors included!
; Monitor output for professional scope display
; Simple and safe 9V battery operation
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
HV Plasma Generator
Generate 2” sparks to a handheld
screwdriver! Light fluorescent tubes
without wires! This plasma generator creates up to 25kV at 20kHz from a
solid state circuit! Build plasma bulbs from
regular bulbs and more! Runs on 16VAC or 5-24VDC.
PG13 HV Plasma Generator Kit $64.95
Voice Activated Switch
VS1 Voice Switch Kit
Voice activated (VOX) provides a
switched output when it hears a
sound. Great for a hands free PTT switch
or to turn on a recorder or light! Directly switches
relays or low voltage loads up to 100mA. Runs on 6-
Logic Interface Module
RI1 Logic Interface Kit
Interface your digital output to the
real world with an on-board SPDT
relay rated at 240V at 10A! It takes a digital
low (.5VDC or less) or a high (+1 to +12VDC) and
provides your choice of an active low or high closure!
It’s that simple! Runs on 12VDC at 60mA.
Speedy Speed Radar Gun
Our famous Speedy radar gun
teaches you doppler effect the
fun way! Digital readout dis-
plays in MPH, KPH, or FPS. You
supply two coffee cans! Runs on
12VDC or our AC121 supply.
SG7 Speed Radar Gun Kit
Passive Aircraft Monitor
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
airshows, hears the active traffic as it happens! Available kit or factory assembled.
ABM1 Passive Aircraft Receiver Kit
Get the brand new 2013 Ramsey Hobby
Catalog today! Filled with some of the
neatest goodies around! Order yours
today... Or download the PDF at
4-Channel USB Relay Control
This professional quality USB
relay controller allows computer controlled switching of
external devices, plus full bi-directional communication
with the external world using
the USB port of your computer!
The controller features four onboard relay outputs with
a current rating of 10A each. Also onboard is a 6-chan-
nel Input/Output interface, with each channel individually configurable as Digital Input, Digital Output, Analog
Input (10-bit Resolution). 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.
Laser Trip Sensor Alarm
LTS1 Laser Trip Sensor Alarm Kit $29.95 UK1104 4-Ch USB Relay Interface Kit
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.
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
Van de Graaff Generators
Create your own lightning with these time tested student favorites! Produces low current static currents that can be “shocking” but perfectly
safe! Draw sparks to a screwdriver, grab hold
and watch your hair stand straight up! Two
models produce from 200kV to 400kV!
VG Van de Graaff Generators from $139.95
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