Subminiature 40W Stereo Amplifier
✔ 2 independent 20 watt amplifiers in one
✔ Super efficient Class D spread spectrum design!
✔ Built-in click and pop suppression!
✔ Selectable gain from +22dB to +36dB!
✔ Logic level mute and shutdown!
✔ Runs cool, no heat sink required!
✔ Built-in thermal protection!
✔ Runs on 10 to 18 VDC
N e2 w0 0F8o r
40 Watts, 87% Efficient, No Heat, All On A 2½” Board!
The UAM4 is the big brother to the extremely popular UAM2. It uses the latest
spread spectrum amplifier technology to bring you clear, crisp, high-power audio
without any of the heat which is normally associated with such an amplifier. It’s
extremely clean Class D design produces two independent 20 watt outputs! This
can also be bridged to an extremely efficient (87%!) single channel (mono) 40
And at 40 watts, you’re probably already wondering about the heatsink requirements to dissapate the heat, right? Stop wondering, there’s no heat, so there is
no heatsink required! And all that power is generated in a single SMT device the
size of your thumbnail on a small 2½” square board!
The high impedance input is designed to use your choice of either a balanced line
input or an unbalanced signal source using easy to connect Euro terminal blocks.
Logic connections to ground are also provided to mute and/or shut down the
amplifier. You can also enable the built-in over temperature signal to activate one
of these controls automatically! Easy to use board jumpers offer selectable gain of
+22dB, +25dB, + 29.5dB or +36dB to match your input levels. Board jumpers
also enable protection and shutdown options as well as stereo/mono/bridge
mode. The amplifier also features built-in click and pop suppression to protect
not only your ears and sanity, but your speakers and equipment!
Power input for maximum rated output is 18VDC at 2.64A. Input voltage can be
reduced to a minimum of 10VDC while maintaining the same high efficiency
operation with reduced output power. If you’re looking for an incredible stand-alone stereo (or mono) amplifier to build into your equipment, vehicle, speakers,
or application, the UAM4 is the latest and the greatest!
UAM4 Subminiature 40W Stereo Audio Amplifier Kit
✔ Generate 7.5kV DC!
✔ Blast of fresh air
Build this neat Ion generator and
watch the 7 ion wind tubes generate
an ion filled blast of fresh air! No fan
blades, no motors, no noise, just swiftly moving charged air!
Designed to teach the principles of ion
propulsion and how spacecraft use
ions to accelerate through space, and
at the same time providing a really
neat ion air cleaner! Comprehensive
theory learning information is included.
Generates 7.5kV DC negative at 400uA,
and that’s a LOT of ions! Runs on 12-
15VDC at 500mA.
✔ 2” sparks!
✔ Generates 25kV!
✔ Build your own
Generates 25kV at 20kHz from a solid
state circuit! Produce stunning lighting
displays, generate big sparks, and do a
lot of experiments with this high voltage plasma generator!
Take a regular Decora style light bulb
and create great looking plasma balls.
Light fluorescent tubes without wires.
Generate 2” sparks to a handheld
screwdriver! While generating 25kV,
it’s low current is relatively safe. The
PG13 runs on 16VAC for full output, or
5-24VDC to vary the output voltage. If
you want to learn about plasma and
high voltage, this is the kit for you!
IG7 Ion Generator Kit $64.95 PG13 Plasma Generator Kit $64.95
Laser Trip Sensor
✔ True Laser rotects over 500 yards!
✔ Audible & visual alert!
✔ 5A external trigger relay
At last, a true laser beam alarm
within the reach of the hobbyists! Comes complete with a small key-chain type high power laser pointer, laser detector, and PVC enclosure.
The unique break-away circuit board allows you to remotely locate the sensor
from the detector board. Range is over 500 yards, and with the addition of simple mirrors, complete perimeter protection is a snap! The detector board includes
both audible and visual indicators plus a built-in 5A relay provides closures for any
alarm functions you need. Detector requires 9-18VDC or a standard 9V battery.
LTS1 Laser Trip Sensor Kit $29.95
Passive Aircraft Airband Receiver
✔ Monitors the entire 118-136 MHz aircraft
band without tuning!
✔ Great for air shows!
✔ Passive design, can be used onboard aircraft!
✔ Patented circuit and design!
For decades we have been known for our novel and creative
product designs. Well, check this one out! An aircraft receiver
that receives all nearby traffic without any tuning. It gets better...
there is no local oscillator so it doesn't produce, and can't produce, any interference associated with all other receivers with an
LO. That means you can use it onboard aircraft as a passive
device! And what will you hear? The closest and strongest traffic,
mainly, the one you're sitting in! How unique is this? We have a patent on it, and
that says it all!
This broadband radio monitors transmissions over the entire aircraft band of 118-
136 MHz. The way it works is simple. Strongest man wins! The strongest signal
within the pass band of the radio will be heard. Receiver sensitivity is less than
2uV for detectable audio. Headset cord is coupled as the antenna giving you great
reception. Also includes a set of stereo ear buds. Runs on a standard
9V battery. Available thru-hole kit or SMT factory assembled & tested.
Passive Aircraft Airband Receiver Kit
Factory Assembled & Tested ABM1, SMT Version
3-in-1 Multifunction Lab
✔ Digital multimeter!
✔ Regulated power supply!
✔ Temp controlled soldering station!
✔ RoHS lead-free compatible!
Take a close look! On your left is a multifunction 3½ digit digital multimeter. Its large backlit LCD display can be seen
from anywhere on your bench while you’re working. The DMM also features
built-in transistor, diode, and continuity testing plus data hold and audible alarm.
Next up, the regulated lab DC power supply. Switch selectable ranges of 3V, 4.5V,
6V, 7.5V, 9V, and 12V provide a continuous duty current of 1.5 amps with a 2 amp
peak! Features both overload protection and overload indication.
To the right we have a high quality temperature regulated soldering station. The
24V low voltage iron features an isolated ceramic 48 watt temperature controlled
element. Front panel control gives you variable tip temperature control from
150°C to 450°C and LED indication of power-on and heating-on. Runs on 120VAC.
LAB1U 3-in-1 Multifunction Lab $119.95
FM Stereo Transmitter
✔ PLL synthesized, drift free!
✔ Front panel digital control!
✔ Professional metal case
✔ Super audio quality
For decades we have been the
leader in hobbyist AM & FM transmitters. The legacy continues with
the FM30B! Rock stable PLL synthesized circuit keeps you dead-on frequency. A user friendly multimode front panel interface gives you full control of ALL operating parameters with
a brilliant 2-line LCD display. EMI filtering and microstrip inductors reduce micro-phonics and noise normally associated with hobby transmitters. RF power output
is continuously variable from 0-25m W.
Runs on 13.8-16VDC and includes a switching AC power supply. Get on the air
today with your own FM30B! Visit www.ramseykits.com for complete details.
FM30B Synthesized FM Stereo Transmitter Kit $199.95
MORE than just friendly on-line ordering!
Clearance Specials, Ramsey Museum, User Forums, Dealer Information, FAQ’s, FCC
Info, Kit Building Guides, Downloads, Live Weather, Live Webcams, and much more!
Get The Catalog!
Get the latest 2007 Ramsey Hobby Catalog!
96 value packed pages of the neatest
goodies around! Order yours on-line today
or give us a call! Or download the PDF at
590 Fishers Station Drive
Victor, NY 14564
✦ Build It!
✦ Learn It!
✦ Achieve It!
✦ Enjoy It!
Prices, availability, and specifications are subject to change. Not responsible for typos, stupids,
printer’s bleed, or tryptophan overdoses. Robin wanted a turkey in the ad, not one to write it!
Visit www.ramseykits.com for the latest pricing, specials, terms and conditions.
Copyright 2007 Ramsey Electronics, LLC...so there!