Circuit

Hi!

I try to draw scheme for this circuit. I'm not sure what is first and what second transistor (NPN, PNP) ?

Note: Power supplay is -15V

Regards,


**broken link removed**

They're both PNP transistors.

It's nothing complicated, just an emitter follower connected to a common emitter amplifier.

The circuit is really old, they might even be germanium transistors; what are their part numbers?

What are the tolerance of the resistors?

The 82.7k is certainly just 82k.

The 10.7k is probably 10k but it might be 11k.

The 1.6k resistor is 1.5k if it's 10% tolerance or 1.6k if it's 5%.

Because it's such an old circuit, the resistors are probably all 10% tolerance.

Thanks Hero999 for quick replay. so is this correct ?

**broken link removed**

That's it.

If you want to build it you'll need to replace the resistor values you measured with standard values as I mentioned above.

With the component values shown the gain will be 13.8 assuming a gain of 100 for Q2.