My 15 year old nephew built his own speakers so I figured it would be cool if we built an amp to power them with. I bought a L 20 amp kit from china and taught him how to solder it up. I picked up a broken amplifier off E-bay for the case and transformer and put the new L 20 amp boards inside. The broken amp was a Samson Servo 240 and was air cooled so there is a nice heat sink on the back to mount the new L 20 boards to. The transformer puts out 55 volts DC after the bridge rectifier which should match up nicely to the L 20 boards. I was also able to reuse two 10,000 uf 71 volt capacitors from the old amp.
The question is do we need a pre amp for this project? My nephew plans to run his I pod or a CD player threw this so they are at line level, but when I tested out the amp with my I pod I ran out of gain really fast and wasn't able to get the full volume out of the amp.
The amp sounds great with no hiss or hum, but I can't get enough volume out of it. I have it hooked up to a smaller PA monitor speaker which is good for 50 watts and can barely make it distort before running out of gain on the I pod volume. I hooked up a 100 watt sub woofer and easily maxed out the volume with out any distortion. The amp is no ware near clipping.
Please let me know if I need a pre amp for this amplifier and if ether one of these boards would be a good choice.
Thanks, Dale P.
[wiki=http://www.ebay.com/itm/320915557448?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649]%[/wiki]
[wiki=http://www.ebay.com/itm/220866124397?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649]%[/wiki]
The question is do we need a pre amp for this project? My nephew plans to run his I pod or a CD player threw this so they are at line level, but when I tested out the amp with my I pod I ran out of gain really fast and wasn't able to get the full volume out of the amp.
The amp sounds great with no hiss or hum, but I can't get enough volume out of it. I have it hooked up to a smaller PA monitor speaker which is good for 50 watts and can barely make it distort before running out of gain on the I pod volume. I hooked up a 100 watt sub woofer and easily maxed out the volume with out any distortion. The amp is no ware near clipping.
Please let me know if I need a pre amp for this amplifier and if ether one of these boards would be a good choice.
Thanks, Dale P.
[wiki=http://www.ebay.com/itm/320915557448?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649]%[/wiki]
[wiki=http://www.ebay.com/itm/220866124397?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649]%[/wiki]