modified 6 years ago

Phase splitter

00:50:16

This time with a CE input stage and resistors that hurz reccomended

published 6 years ago

hurz

6 years ago

right, with an additional transistor stage the input impedance does match much better and the low corner moved drastical. Whats still a bit messy is the push pull with high idle current and hfe dependend. Im afraid it will cause thermal runaway. Anyway, why not use at that point a standard NPN PNP stage, the old time were we needed to use NPN instead of not available PNP is long over. So this in total is actually a concept which is very very old 1960'

crake

6 years ago

I had seen that output stage in a book last year and I decided to give it a try. I remember hearing a story about op amps being built with nothing but npn because pnp performance was so bad. Interesting history of electronics.

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