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Amplifier board debugging notes (view source)
Revision as of 16:31, 30 September 2010
, 16:31, 30 September 2010→Change of reference for summing circuit input stage DC level
The adjacent diagram shows the necessary circuit. The component values are set as follows.
The adjacent diagram shows the necessary circuit. The component values are set as follows.
* Recommended values for V<sub>cc</sub> - V<sub>B4</sub> = 0.9V - {R1,R2} = {30kΩ,100kΩ}
* Recommended values for V<sub>cc</sub> - V<sub>B4</sub> = 0.9V - {R1,R2} = {30kΩ,100kΩ}
* Good value for I<sub>k</sub> is 2mA. Current through R1, R2 is negligible, as is the current going to the load (6 summers x 10uA base current) This I<sub>k</sub> ~ I, so R ~ 2kΩ (but anywhere 1-5kΩ works)
* Good value for I<sub>k</sub> is 2mA. Current through R1, R2 is negligible, as is the current going to the load (6 summers x 10uA base current) Thus I<sub>k</sub> ~ I, so R ~ 2kΩ (but anywhere 1-5kΩ works)
* 154Ω worked well for the emitter resistor (R<sub>f</sub>) on the summer input stage.
== Wrong voltage on R<sub>C</sub>/R<sub>D</sub> junction ==
== Wrong voltage on R<sub>C</sub>/R<sub>D</sub> junction ==