Uam2 • 1 universal audio amplifier ramsey electronics model no. Uam2 • whopping 20w output at 18v. • runs on 8v to 18v dc. • snr: 102db at 15w into 8Ω, 18v 95db at 10w into 4Ω, 12v • thd + n: 1% at 15w into 8Ω, 18v .2% at 10w into 4Ω, 12v • square board for screw mounting, or circular “break out” bo...
Uam2 • 2 partial list of available kits: ramsey transmitter kits • fm10a, fm25b fm stereo transmitters • am1, am25 transmitter ramsey receiver kits • fr1 fm broadcast receiver • ar1 aircraft band receiver • sr2 shortwave receiver • aa7 active antenna • sc1 shortwave converter ramsey hobby kits • sg7...
Uam2 • 3 universal audio amplifier ramsey publication no. Uam2 manual price only $5.00 table of contents introduction to the uam2 .................................. 4 uam2 circuit description .................................. 4 “learn-as-you-build” kit assembly ................... 6 parts list .......
Uam2 • 4 introduction the uam2 is a small, high quality audio amplifier that you can plug any line level source into and get a whopping 20w out! So if you want, you can plug your portable cd player in and run your big ol’ speaker! The board is made so that you can mount it directly onto the back of ...
Uam2 • 5 first, your audio input is compared to a high frequency reference signal. This generates two squarewave outputs. These outputs change phase in response to the audio input. When the audio input is 0 volts, the two outputs are nearly in phase and the differential voltage is almost zero most o...
Uam2 • 6 ramsey learn-as-you-build kit assembly there aren’t that many solder connections on the uam2 printed circuit board, but you should still practice good soldering techniques. • use a 25-watt soldering pencil with a clean, sharp tip. • use only rosin-core solder intended for electronics use. •...
Uam2 • 7 be installed by holding it with tweezers in contact with the “tinned” trace and re-heating the solder (see the associated diagrams). Another commonly used technique is to glue the surface mount components to the printed circuit board before soldering. The procedure is to take a small amount...
Uam2 • 8 uam2 parts list sort and “check off” the components in the boxes provided. We do our best to pack all our kits correctly but it is possible that a mistake has occurred and we missed a part. Please note that physical descriptions of parts are for those currently being shipped. Sometimes the ...
Uam2 • 9 uam2 pc board assembly steps let’s start with the surface mount components first, and do the big through hole parts last, except for j3, which we will install as a reference part to get our bearings. You want to be careful about how much heat you apply to the teeny parts. Just get the tabs ...
Uam2 • 10 18. Install l1, surface mount ferrite bead, under d3. 19. Install c2, 1 uf surface mount capacitor, under l1. 20. Install c13, .22 uf surface mount capacitor, to the left of c2. 21. Install r1, 51 ohm surface mount resistor, to the left of c13. 22. Install c3, 1 uf surface mount ...
Uam2 • 11 setup and testing well, setup and testing for this kit is really easy. Just plug in a line level or even headphone level audio source into j3. Use j1 and j2 to set the gain. Use the chart below: ‘on’ means the jumper block is on the pins, and ‘off’ means it isn’t. Start out at minimum gain...
Uam2 • 12 setup and testing well, setup and testing for this kit is really easy. Just plug in a line level or even headphone level audio source into j3. Use j1 and j2 to set the gain. Use the chart below: ‘on’ means the jumper block is on the pins, and ‘off’ means it isn’t. Start out at minimum gain...
Uam2 • 13 uam2 board parts layout diagram uam2 main board schematic.
Uam2 • 14 conclusion we sincerely hope that you will enjoy the use of this ramsey product. As al- ways, we have tried to compose our manual in the easiest, most “user friendly” format that is possible. As our customers, we value your opinions, comments, and additions that you would like to see in fu...
Uam2 • 15 the ramsey kit warranty please read carefully before calling or writing in about your kit. Most problems can be solved without contacting the factory. Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All ramsey kits will work if assembled...
Uam2 • 16 table of contents introduction to the uam2 .................................. 4 uam2 circuit description .................................. 4 parts list ........................................................... 8 assembly steps ................................................. 9 troubles...
