IRFP240,9240 MOSFET Amplifier 230W

This is simple audio Power amplifier circuit with MOSFET amplifier TL071C and TL072C may be up to 45W into 8 ohms. For MOSFET IRFP240 and IRFP9240 are used safety with device can now be these modification.

IRFP240,9240 MOSFET Amplifier  Circuit

The amplifier circuit is at the request SILICONIX and the voltage change of 2 serial resistances from suppliers operating voltage amplifier driver was inserted.

Amplifier efficiency is 70%, the reduction in the frequency distortion in more than 0.2% at 20 Hz at 8 ohms and 10W. With a supply voltage in the range of + – 30V, can supply audio amplifier MOSFET 45W into 8 ohms and 70W into 4 ohms. Remember that the sound amplifier is short, so all you can check the radio button is protected, whether the speaker is connected.

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Simple Preamp Mic using LM358

This is a simple audio mic pre amplifier circuit based on single IC LM358. The circuit is very simple, inexpensive and easy to built.

Rangkaian Simple Preamp Mic using LM358

LM358 Pinout

Note:

• variable resistor of R5 to adjust the gain of op-amplifier IC LM358.
• The LM358 has two op-amp module, you may build stereo audio pre-amplifier using single LM358.

Component list of simple preamp mic circuit:

R1, R3, R4 : 10K
R2         : 1K
R5         : 100K-1M Potensiometer
C1         : 0.1uF
C2         : 4.7uF/16V
IC1        : LM358 dual op-amplifier
Mic        : Electret Microphone 

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