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Originally Posted by RonRyan85
I see some factory built HEADPHONE AMPS pictured in an expensive
audio equipment catalog I get in the mail and they are $300. and up.
Seems like it would be a good project for electronic hobby people to
build themselves. (Small amp: 1 tube or a few transistors? ,power
supply ,2 earphone jacks and a small aluminum box/chassis.). Anyone
have a schematic or ever built one yourself?  |
I built one hardwired on vectorboard over lunch last week. It used 2x 9V's & an AD712 opamp. The design varies somewhat from the CMOY in that I used the parts I had on-hand. Also, I used a dual opamp (AD712) and it is easier to build around than using 2x 8P cased ones (OPA134) as recommended in the CMOY article. You could use a dual OPA2134 instead.
All that aside, it makes a major improvement over the stock HP out a portable device. Using a set of large 300-ohm phones, it pushed them to louder levels than I would normally listen to. Also, off 2x 9V's its ran for nearly 7 hours before the output dropped. For static use, I bought a 16V computer wall-wart and I use it in place of the batteries.
Good luck, this is a great beginners project that has real merit.
soundmotor