Ramsey Electronics 2012 Catalog - Home

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22 KIT Audio Amps& Accys Wired & Tested First we designed the UAM2, the extremely popular audio amplifier module that provides 20 watts of clean audio with virtually no heat... or heatsink! People loved it, and “stuck” them everywhere, from the back of speakers to inside their custom equipment to drive speakers. Last year saw the introduction of the “big brother” of the UAM2, our UAM4. The UAM4 upped the ante; this little 2.5” board provided 42 watts of stereo from a single SMT device! Just like the UAM2, people fell in love with it, and then they suggested we put together a complete audio amplifier system based on the UAM4 design. Their requests seemed like a great idea, so the UAM4SYS was born! SPECIFICATIONS Audio Output: 2 x 21W stereo mode, 8 ohms 1 x 42W mono mode, 4 ohms Signal/Noise: 91dB into 8 ohms, 22Hz-22kHz THD+N: 0.1% Audio Input: Balanced, unbalanced, hi-Z Gain Adjust: Jumper settings, +22dB, +25dB, +29.5dB, +36dB PSRR: 90dB at 1kHz Efficiency: Up to 87% Protection: Short circuit, thermal overload, Auto short shutdown Auto thermal shutdown Modulation Scheme: Spread-spectrum (SSM Clock frequency 200kHz ±4kHz Line Outputs: Selectable pre/post processing, dual RCA unbalanced Headphone Out: 64 step digital level control with memory, 3.5mm front panel Speaker Out: Spring clamp terminal block, 14- 28AWG, rear panel Front Panel Controls: Volume, bass, treble, balance, digital DC controls Mute: Digital push button with LED Loudness: Digital push button with LED Power: On/off with LED Over Temp: LED indicator Audio Input: 3.5mm stereo unbalanced 3.5mm balanced/unbalanced each channel, 10K impedance Case: Anodized aluminum Power Supply: 12VDC to 18VDC, 3.3A at 18VDC, 2.1mm center positive rear panel Dimensions: 5.28” x 6.2” x 1.2” board 5.6” x 6.6” x 1.6” case Weight: 1.24 lbs Our goal was to make a universal amplifier that is both compatible with anyone’s system requirements, and could be simply plugged in and used. Sounds simple, but it took some serious design work, and resulted in a lot of seriously awesome features! Like the UAM4, the amplifier is based on a single SMT device that runs in class D, which means it’s highly efficient (up to 87%) and produces very little heat. It provides stereo audio power of 21 watts per channel, or 42 watts total audio power! 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! Construction wise, the entire amplifier assembly is nicely designed around a main board and a front panel control board. The micro-miniature SMT amplifier and related SMT components are pre-installed on the main board. The remaining parts are through-hole to make construction simple. Look at the front and rear view of the boards... what’s missing? Yep, no heatsinks! The amplifier runs 87% efficient, and produces little (if any) heat! 42W Universal Stereo Amplifier System ✔ 42 watt class D amplifier spread spectrum design! ✔ Highly efficient heat-free operation! ✔ Built-in click and pop suppression! ✔ 0.1% distortion! ✔ Balanced and unbalanced audio inputs! ✔ All DC digital controls for noise-free operation! ✔ Selectable pre/post process line outputs! ✔ Short circuit proof! ✔ Operates on 12-18VDC at a mere 3.3A! ✔ Compact and attractive shielded aluminum case! The Ultimate High-Tech Super Efficient Amplifier Solution! The high impedance input is designed to use your choice of either a balanced line input or an unbalanced signal source. A single stereo 3.5mm input can be used for a single stereo unbalanced input (i.e. a typical computer audio stereo cable) and there are separate 3.5mm left and right audio inputs that can be used as balanced (TRS) or separate unbalanced inputs. It’s your choice! Speaker outputs are provided on the rear panel via spring clip terminal blocks compatible with 14-28AWG speaker wire. Separate left and right line outputs are also provided on the rear panel via RCA unbalanced connectors. Best of all, you can select these outputs to be either pre or post processing! Front panel controls are all DC or digital, giving you noise-free operation. No noisy/touchy volume pots ever again! Volume, bass, treble, and balance controls are provided to let you configure the audio exactly to your personal preferences. In addition, mute and loudness on/off’s with matching LED indicators are provided on the front panel. We’re especially proud of the headphone output circuit on the UAM4SYS. The standard 3.5mm stereo headphone jack on the front panel is controlled with digital up/down push button controls. This gives you 64 steps of audio level, and even stores your last setting so your headphone level will remain the same! The headphone jack is also pre-mute to allow monitoring while the speakers are muted. It also makes it possible to have a “single master” unit with remote amplifiers daisy-chained or bridged together with the ability to turn one off individually without disturbing the others downstream. That’s just one of the many systems you can implement with the UAM4SYS - the only limit is your creativity and imagination! An over-temp LED is provided on the front panel to indicate problems like shorted outputs. The amplifier also detects this condition and automatically shuts down for protection until the short is cleared. Considering all these features, you may be surprised to learn that we managed to fit the whole thing in a compact anodized aluminum case that is a mere 1.6” high! It makes an attractive addition to any equipment stack or computer setting. If you’re looking for a great way to properly drive speaker monitors from the line out of your computer, the UAM4SYS is perfect. One single stereo input cable between the computer and the UAM4SYS, a pair of decent nearfield monitor speakers, and you’re all set. This is great for people that use their PC for audio and video editing. It’s also the perfect choice for anyone looking for a high quality amplifier for an iPod or MP3 player. Input power is 12-18VDC. At 18VDC and providing maximum power output, the high efficiency amplifier only draws 3.3A! The broad power input range also makes it perfect for automobile use. Just plug it into an accessory power plug (formerly known as a cigarette lighter plug!). A lot of customers use their own power supplies or use the UAM4SYS in a mobile environment, so we do not include a power supply. The optional SPS183 is a compact desktop switching power supply that provides 18VDC to produce the maximum output power of the amplifier. It has a wide input range of 100-240VAC so it’s compatible with domestic or international mains. (If you order the factory assembled and tested version, we include the power supply so you can plug it in and crank it up!) The complete amplifier measures 5.6” x 6.6” x 1.6”. If you’ve been looking for the perfect audio amplifier, look no further! UAM4SYS 42 Watt Stereo Amplifier Kit $169.95 UAM4SYSWT 42 Watt Stereo Amplifier, Factory Assembled & Tested, With SPS183 Power Supply $249.95 SPS183 18VDC, 3.3A Switching Power Supply, 100-240VAC, 50/60Hz $59.95
Shop online at www.ramseykits.com Call Toll Free 800-446-2295 Subminiature 20W Amplifier ✔ 20 Watts from one SMT package! ✔ Super efficient Class D design! ✔ Super clean output! ✔ No heat/heatsink concerns! SPECIFICATIONS Audio Output: 20W max Signal/Noise: 102dB into 8 ohms Total Harmonic Distortion: Less than 1% Audio Input: Line level 10K unbalanced Gain Adjust: 4 input gain settings Protection: Auto short to ground shutdown Auto short to Vcc shutdown Auto short shutdown Auto thermal shutdown Power Input: 8-18 VDC, 2.1mm connector (18VDC for full rated output) Dimensions: 2.6” square, 1.43” diameter KIT 22 Watts..And NO Heat! The UAM2 is probably the neatest audio kit to come along in quite a while! It uses the latest amplifier technology to bring you clear, crisp, highpower audio without any of the heat which is normally generated! Audio Amps & Accys 23 Lesson time: This is what is called a class “D” amplifier or as the media calls it, a “Digital” amplifier. Instead of operating like a classic class “A” or class “AB” amplifier which leaves transistors biased on all the time, losing energy whether they are producing audio or not, the class “D” amplifier only produces power into the load of your speaker! This means that the amplifier device can deliver a full 20 watts of power without getting so much as warm! Now it gets even better... The entire 22 watt amplifier device is a single SMT component! YES, I said SMT or Surface Mount! We designed the amplifier around the device to provide all the necessary interfaces, inputs and outputs in a convenient mounting package. Audio input is standard unbalanced line level at 10K brought out to an RCA jack. Speaker output is brought out to convenient board mounted screw terminals. The amplifier has selectable gain of 12dB, 18dB, 23.6dB, and 32dB. This is selected via board jumpers. A amplifier shutdown terminal is also brought out to the Euroblock. You can use that to switch the amplifier on/off by taking it to ground. The UAM2 runs on 8-18VDC, and is brought out to a standard 2.1mm power jack AND two terminals on a Euroblock. Therefore if you’re hardwiring it, you don’t need to use a plug from a separate power supply! Full rated output will be achieved at 18VDC, but will operate all the way down to 8VDC! And that means it works great in a vehicle at 12VDC! Just think of the applications! The entire amplifier board is 2.6” square and can be easily installed inside your speaker enclosures, or other components. We made it even easier with a unique board that can be “snapped” out into a small circle to be double face tape mounted directly to the back of a speaker! And however or wherever it’s mounted there is no concern for heat, ventilation, or the need for a heatsink! This IS a Surface Mount (SMT) kit, so you will need fine tweezers, magnifier, and a decent fine tip soldering iron! See assorted tools and accessories in the tools section. (Who ever imagined 20 watts in a single SMT device; I still remember fighting with vacuum tubes to get 20 watts!) UAM2 20 Watt Audio Amplifier Module Kit $49.95 SPS18 18VDC Switching Power Supply, 1.7A $39.95 KIT 42 Watts, 87% Efficient, No Heat, All On A 2½” Board! When we released the UAM2, it became the most popular audio amplifier product in our history. The novel Class D design, providing a clean 20 watts in such a tiny package, set the hobbyist world on fire! And that’s a pretty tough task when it didn’t even produce any heat at its full output! Because of the popularity of the UAM2, we put the engineering staff into overdrive and the result is the UAM4! 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 21 watt outputs! This can also be bridged to an extremely efficient (87%!) single channel (mono) 42 watt amplifier. And at 42 watts, you’re probably already wondering about the heatsink requirements to dissipate 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! For a quick tutorial on Class D amplifiers, see the description of the UAM2 above! 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 Euroblock terminals. No more concerns about having a matching input connector or plug or Subminiature 42W Stereo Amplifier ✔ The EXTREME big brother of the UAM2 in stereo! ✔ 2 independent 21W amplifiers in one SMT package! ✔ Super efficient Class D spread spectrum design! ✔ Built-in click and pop suppression! ✔ Balanced & unbalanced hi-Z inputs! ✔ Logic level mute and shutdown functions! ✔ Selectable gain from +22dB to +36dB! ✔ Built-in thermal protection! ✔ Programmable device shutdown with LED indicator! ✔ Runs cool, no heat sink required! ✔ All this on a 2½” square board! SPECIFICATIONS Audio Output: 2 x 21W stereo mode, 8 ohms 1 x 42W mono mode, 4 ohms Signal/Noise: 91dB into 8 ohms, 22Hz-22kHz THD+N: 0.1% Audio Input: Balanced, unbalanced, hi-Z Gain Adjust: Jumper settings, +22dB, +25dB, +29.5dB, +36dB PSRR: 90dB at 1kHz Efficiency: Up to 87% Protection: Short circuit, thermal overload Programmable thermal flag Auto short shutdown Auto thermal shutdown Power Input: 10-18 VDC, 2.1mm connector (18VDC for full rated output) Dimensions: 2.5” square whether it’s balanced or unbalanced! Audio speaker output is brought out to simple screw terminals. It doesn’t get much easier than that. 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 with reduced output. If required, use our switching power supply below which provides 18VDC at 3.3A with an input of 100-240VAC, 50/60 Hz. As a result of customer requests, we have also designed this amplifier circuit into a complete 42 watt stereo amplifier system! Check out the UAM4SYS on the previous page, it’s a complete system amplifier in a compact aluminum case. Gives you the performance of a component system amplifier with no heat and in a compact form factor! If you’re looking for an incredible stand-alone stereo (or mono) amplifier to build into your equipment, speakers, or application, the UAM4 is the latest and the greatest! Remember, this is an SMT kit so you will need tweezers, a magnifier, some pretty good eyes, and a fine tip soldering iron or station. Check out SMT related tools in our Tools section. (Think back to the components, power supplies, and heatsinks it used to take to get 40 watts!) UAM4 42 Watt Audio Amplifier Module Kit $69.95 SPS183 18VDC, 3.3A Switching Power Supply, 100-240VAC, 50/60Hz $59.95
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Cable Polarity Checker Shop online
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POWER ADAPTERS AND POWER SUPPLIES A
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KIT PC-BOARD SOLDERING Shop online
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