Gustav Brock
Gustav at cactus.dk
Thu Feb 2 08:58:07 CST 2012
Hi John Oh, µ741 (or UA741, LM741, whatever) ... those were the days! I still have a 4U rack mounted 2 x 30W line/power amp (including line transformers) I build in the mid 70s from mostly two opamps and a set of NPN/PNP output stages. All in- and outputs are with original Cannon XLR3 connectors which was highly advanced (and expensive!) of that time: http://en.wikipedia.org/wiki/Cannon_plug /gustav >>> jwcolby at colbyconsulting.com 02-02-2012 15:15 >>> As you have probably gathered, I have many interests, including DIY various things. I have built a DIY CMOY headphone amp, see discussion here: http://nwavguy.blogspot.com/2011/07/cmoy-with-gain.html which I ended up giving away to my brother-in-law who is mostly deaf. Anyway, I ran across an interesting blog for a DIY headphone amp. http://nwavguy.blogspot.com/2011/07/o2-headphone-amp.html If you read that you will find links to other blog pages discussing many details of the design and electronics. I started my career in electronics back in the 70s and loved op amps in particular. It has been a loooong while since I really studied electronics but it still fascinates me. Enjoy. -- John W. Colby Colby Consulting