Timeline for Why am I getting no gain from this differential circuit?
Current License: CC BY-SA 3.0
3 events
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Dec 19, 2017 at 15:14 | comment | added | Oldfart | I am no expert but I have seen a similar circuit where they use a PNP transistor with BE (plus resistor? can't remember) over R3. | |
Dec 19, 2017 at 15:10 | comment | added | Yossarian | Thanks Dave, I hadn't actually realised they were in parallel! I set up the quiescent voltage of around 1.66 at the output of the differential pair on purpose so as to just bias Q5 and try to get more gain from the collector and emitter resistor ratios. Will it be possible to get 1500+ voltage gain from this circuit providing I bias it correctly? | |
Dec 19, 2017 at 14:26 | history | answered | Dave Tweed | CC BY-SA 3.0 |