Build It, Learn It, Achieve It, Enjoy It!
The Neatest Kits... For Over Three Decades!
40 Watts, 87% Efficient, No Heat, All On A 2½” Board!
✔ Built-in thermal protection!
Subminiature 40W Stereo Audio Amplifier Module
✔ 2 independent 20W amplifiers in one SMT package!
✔ 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!
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 watt amplifier. 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!
New For 2008
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 40 Watt Subminiature Stereo Audio Amplifier Module Kit
UAM2 20 Watt Subminiature Audio Amplifier Kit (See www.ramseykits.com for details)
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 keychain
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 Alarm Kit $29.95
Air Blasting Ion Generator
Build this neat Ion generator and
watch the 7 ion wind tubes generate
an ion filled blast of fresh air! Great as
high tech air fresheners and to study how
modern aircraft used ions to accelerate through
space. Runs on on 12-15VDC at 500mA.
IG7 Ion Generator Kit
✔ Generates negative Ions!
✔ Get a blast of fresh air!
✔ 7.5kV DC negative at 400uA!
RAMSEY ELECTRONICS, LLC
590 Fishers Station Drive
Victor, NY 14564
MORE than just friendly on-line ordering!
Clearance Specials, User Forums, Dealer Information, FAQ’s, FCC Info, Catalog Order,
Kit Building Guides, Downloads, Live Weather, Live Webcams, and much more!
Automatic VOX Voice Switch
One of our most popular Mini-Kits! It
hears sound to turn something on.
Use it for transmitters, alarms, turning
on lights, or opening your garage when
you honk your horn. The applications are
endless! The output drives up to a 100mA load to make
control interface a snap. Runs on 6-12VDC. Board measures 2½” x ½” x 1¼”. Turn it on...with sound!
VS1 Automatic VOX Voice Switch Kit $9.95
FM Stereo Transmitter
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 multi-mode front panel interface gives you
full control of ALL operating parameters with a brilliant 2-
line LCD display. EMI filtering and microstrip inductors
reduce microphonics 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!
FM30B Synth. FM Stereo Transmitter Kit $199.95
✔ PLL synthesized, drift free!
✔ Front panel digital control!
✔ Professional metal case
✔ Rivals commercial broadcasts
Prices, availability, and specifications are subject to change. Not responsible for typos, stupids, printer’s bleed, or soldering burns!
Visit www.ramseykits.com for the latest pricing, specials, terms and conditions. Copyright 2007 Ramsey Electronics, LLC...so there!