Electronics > Beginners
Hi, is the gain the same for this two amplifier circuits ?
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nyame:
Hi, please is the gain the same for this two amplifier circuits ? did i calculate the gain correctly ?
please what is role of the following component marked with arrow ?
JS:
  Looks like we are doing your homework for you, they don't have the same gain, the 80k resistor is to take out the DC from the cap, so you just read AC with the volt meter. The cap and the two resistors is a network to get a different emitter impedance for signal and DC, so you can control bias independent from signal gain.

JS
nyame:
Thank u for the reply, please u are not doing my home work for me, I was given that uncompleted circuit to build with the same gain, I have build it up to this level. Components I never had better understanding of their roles are the once I requested for explanations, also please how can I adjust the gain to be the same as shown in the uncompleted circuit thanks
JS:
The gain will be given by the ratio of Rc and Re, with the circuit with the cap at the middle of Re the resistor in parallel with the cap doesn't count for signal.

JS
nyame:
Thanks for the reply, please the gain for the uncompleted circuit is 3.9 right ?
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