Post by puffin on Feb 2, 2017 10:20:01 GMT
www.ebay.com/itm/Opamp-input-plus-Diamond-Buffer-preamplifier-stereo-w-on-board-regulator-PCB-/220894319973?hash=item336e53d565:m:m-ivXMzvFTEB2FOqdO55f_A&clk_rvr_id=1124555777784&afsrc=1&rmvSB=true
I bought one of these in 2010, built the board up and did nothing else with it I recently made it up and it works......but IMO not that well. There is a lot of LF and not a lot of HF coming out. I measured the Ohms out and (if I did it correctly - one probe to signal out + and the other to -) and I am getting 100ohms. I emailed Jims Audio and he said that this was correct. The board can be used as a H/P amp as well as a Preamp. I would have thought that the output should be around1k?
I have been testing it using a simple H/P amp (op-amp based).
I have the schematic.
I bought one of these in 2010, built the board up and did nothing else with it I recently made it up and it works......but IMO not that well. There is a lot of LF and not a lot of HF coming out. I measured the Ohms out and (if I did it correctly - one probe to signal out + and the other to -) and I am getting 100ohms. I emailed Jims Audio and he said that this was correct. The board can be used as a H/P amp as well as a Preamp. I would have thought that the output should be around1k?
I have been testing it using a simple H/P amp (op-amp based).
I have the schematic.
