The discrete opamp, gain pot and a power supply.
Assembly requires a high quality mic input transformer like the Jensen JT-16A. Important note: Jensen 990 style opamp is NOT included* The second amp section gives you a LF351 opamp buffered output to drive a VU meter. I also added solder pads for a 8 pin DIP socket so you could use an opamp like the LF351 instead of the 2520 or 990! Many tech's have used this card as mixing buss upgrades in MCI. This is an awesome preamp for vocal and instrument recording where you want clean crisp accurate reproduction of your mic signal with little coloration. Headroom is even higher with a +/ 24 volt supply. My testing shows a-20 db input at 1KHZ will give you +20 db output( just before clipping) at.06% THD with a +/ 15 volt supply. This circuit will give you 40+ db of gain. The Main amp uses an Jensen 990 or API 2520 type discrete. This PCB has 2 discrete amplifier sections. I don't think anything is wrong with the mobo or the psu.This auction is for(1) one Mic Preamp circuit board. The green light on the back of the psu comes on as well and the fan to the ps and processor work." If so, then the hard drive you have is defective. I think so because you said "When I connected a smaller HD than the 1 I have, it spun up. ANY possible solutions would be GREATLY appreciated! It's driving me insane trying to figure out the cause, thats why im here. The green light on the back of the psu comes on as well and the fan to the ps and processor work. When I connected a smaller HD than the 1 I have, it spun up. I used different psus which were 50 watts lower(all i could find) to check if that was the cause, no luck. My HD isn't spinning either and there are no beeps. The problem i'm having with my Compaq desktop computer is the orange light on the front comes on and stays on as soon as i push the power.
1st and foremost i'm not too familiar with the internal workings of computers :(.
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