Looking for an inexpensive small audio unity gain emitter-follower type buffer amplifier with input impedance equal to or higher than 10 K Ohms, and output impedance of 50 Ohms. Frequency range of 20 Hz to at least 50 kHz with less than 1 dB variation over that range.
If there is some op-amp that can be easily configured to do this, that would be fine. An off-the-shelf package would also work. Single channel. Application is a very old EMI current probe amplifier that has a gain curve that is the inverse of the current probe’s transfer impedance. The combination of the two yields a flat transfer impedance of 0 dB Ohms from 30 Hz to 50 kHz. The rub is this was designed for use with a specific obsolete EMI receiver with selectable input impedance. The required load on the current probe amplifier is 10 k Ohms, which was one of the choices with the old EMI receiver. Nowadays everything is 50 Ohms, so I have to provide the matching. I have been doing that with another obsolete piece of equipment, a Wavetek 452 active filter, but it is a 19” rack-mount sized piece of equipment, and I would like to make this thing as small as possible. Thanks in advance, Ken Javor Phone: (256) 650-5261 - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
