Audio,

There are some discrepancies between what is listed and what is shown.

The schematic shows the generator at 10 mV pk yet the oscilloscope shows 9.xx mV pk yet the scope shows 5 mV/div.

For that to show approximately 411 mV pk the scale would be 200 mV/div.

Something surely is amiss with the printout.

Now, my simulation shows about 850 mV pk-pk with a 20 mV pk-pk input, for the gain of about 42.

 

With 500 mV/V that signal is 2000 mV, not 200... so the gain would be 267 according to that plot.

If the channels are swapped like Rasha actually calculated, the gain becomes 37.5, as the calculation in post #34

 

Ghar,

I know what the oscilloscope shows on Rasha's pdf. I also know you will have a difficlult time replacating it using the 10 mV pk input as shown on Rasha's schematic.

 

I was just fixing AudioGuru's number, I should quote directly next time.

 

Simulated it and got a gain equal to about 54.7 using this model

*2N2219 MCE 5-20-97
*Ref: Motorola Small-Signal Device Databook, Q4/94
*Si 800mW 30V 800mA 300MHz GenPurp pkg:TO-39 3,2,1
.MODEL 2N2219 NPN (IS=81.2F NF=1 BF=195 VAF=98.6 IKF=0.48 ISE=53.7P NE=2
+ BR=4 NR=1 VAR=20 IKR=0.72 RE=64.4M RB=0.258 RC=25.8M XTB=1.5
+ CJE=89.5P VJE=1.1 MJE=0.5 CJC=28.9P VJC=0.3 MJC=0.3 TF=530P TR=368N)
* Origin: Mcebjt.lib