Electronics > Projects, Designs, and Technical Stuff
Stereo mixer amplifier
DonKu:
Greetings,
An article about my stereo mixer-amplifier project is now available.
http://crcomp.net/electronic/mixeramp/index.php
Thank you, 73,
--
Don Kuenz KB7RPU
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.
moffy:
The specs for the isolation transformers says: 10. Total Harmonic Distortion < 0.5% between 275Hz and3.5KHz. It looks like they were primarily meant for telephone systems, rather than audio/hifi. Pretty high distortion levels in the band, will be higher outside.
Zero999:
The load on the secondary of the transformers is fairly low anyway, so you could do away with the op-amp mixer and connect the secondary windings of all of the transformer in series, to mix the signals passively. The only downside is some power from each signal will leak over into the others, but if the load on the transformer secondary windings is high impedance, it will be negligible.
DonKu:
--- Quote from: moffy on October 07, 2019, 08:44:57 am ---The specs for the isolation transformers says: 10. Total Harmonic Distortion < 0.5% between 275Hz and3.5KHz. It looks like they were primarily meant for telephone systems, rather than audio/hifi. Pretty high distortion levels in the band, will be higher outside.
--- End quote ---
Good information. If you don't mind me asking, do you know of a better, readily available transformer?
DonKu:
--- Quote from: Zero999 on October 07, 2019, 09:23:00 am ---The load on the secondary of the transformers is fairly low anyway, so you could do away with the op-amp mixer and connect the secondary windings of all of the transformer in series, to mix the signals passively. The only downside is some power from each signal will leak over into the others, but if the load on the transformer secondary windings is high impedance, it will be negligible.
--- End quote ---
Interesting idea.
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