3stg mic.amp.

00:42:09

published 12 years ago

sasa999

12 years ago

Simple, 3-stage amplifier for the microphone. Advantages: high gain (very sensitive), not prone to self, precision parts denominations + / - 20 percent, a low output impedance. Disadvantages: requires a large supply voltage 9V + /-3V.

sasa999

12 years ago

I was not manufactured this scheme, testing only on the computer.

thebugger

12 years ago

Nice 200 gain but I think a mic is able to provide 4-5mv so you need to review your circuit and you'll neef to increase output cap for better frequency response.

sasa999

12 years ago

Можно уменьшить резистор в цепи коллектора 1 транзистора до 2 kOhm, увеличить глубину обратной связи 39kOhm --> 30kOhm. Тогда входное напряжение можно поднимать до 5-6mV. Правильно?

sasa999

12 years ago

Можно добавить резистор 2 kOhm в цепь эмиттера 2-го транзистора. Тогда входное напряжение можно увеличить до 8 mV. Нелинейных искажений не будет.

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