Koestner hi, I've used this one, ready made for $20 shipped, quite good, all you have to do is give it +15 -15 and earth, these voltages are usually found in most gear. High input impedance 100kohm and good output drivability.
http://www.ebay.com/itm/MINI-SIZE-STEREO-FET-BUFFER-KIT-FOR-CD-DAC-PREAMPLIFIER-TAPE-RECORDING-/171436195085?pt=LH_DefaultDomain_0&hash=item27ea64bd0d
Cheers George
http://www.ebay.com/itm/MINI-SIZE-STEREO-FET-BUFFER-KIT-FOR-CD-DAC-PREAMPLIFIER-TAPE-RECORDING-/171436195085?pt=LH_DefaultDomain_0&hash=item27ea64bd0d
Cheers George