Preamp

196

02:05:10

This has a gain of just over 200V/V. This has a frequency range of 16.4Hz to 48.6kHz at -3dB.

published 8 years ago

BillyT

8 years ago

Looking good.

TheRealDonaldTrump

8 years ago

Shit

hurz

8 years ago

http://everycircuit.com/circuit/4575714413379584

jason9

8 years ago

How is that relevant here, @hurz? Don’t you mean to post that on my “Ultra High Gain Preamp” circuit?

hurz

8 years ago

200V/V is also ultra high for a single stage transistor amp. So doesn't matter were to post it.

hurz

8 years ago

The price for high gain is an ultra high THD of 3.4%

jason9

8 years ago

Where’s the constant current source? Also, the THD is only high because of the way the transistor is configured combined with the amplitude of the input. If the input was reduced to, say 300uV, the THD would be tremendously reduced.

hurz

8 years ago

Transistors are current sources. And resistors connected to a voltage source can also be seen as current source. With 300uV input the total gain drops to about 13V/V and the THD is still bad at 0.4%

jason9

8 years ago

61.4mV wave is a lot stronger than 14 multiplied by 300uV. 61.4mV/300uV (61.4/0.3) is still over 200. Ok, the THD is bad, but it’s better, and my only experience with this configuration (input goes to base, emitter held steady by a capacitor, and collector hooked up to resistor) is bad THD because of the nonlinearities of the transistor, and the only way to escape that is to increase the idle current thereby putting the nonlinear region further away, but such high currents are just a waste of power.

hurz

8 years ago

Right, the gain is still around 200. I just gave you the link to my circuit to demonstrate, its possible to have almost any gain with a single transistor. So its not a big wonder to have 200V/V you can have even 240000V/V with a lot of other drawbacks however in principle its possible and not a big surprise.

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