The 50W Power Amplifier OCL Mosfet (K1058 + J162) is easy to build, and very inexpensive. To use Power Supply +35V -35V at 2A. Power Mosfet (K1058 + J162) must be mounted on heat sink. Can be directly connected to CD players, tuners and tape recorders.
If you want a good amplifier, at affordable prices, for you to enjoy at homeI recommend this circuit, which has excellent sound quality, is not lose their sound expensive.
In the circuit can be seen. Similar to an general audio amplifier MOSFET , Except the output power mosfet, instead we use J49 and K134, which are more expensive than necessary, We use dual output number J162/K1058, which Cheap much more. And other features. Not less than any.
Features of the circuit
Power output at 1kHz
-Load 8 ohm 50W
-Load 4 ohm 88W
Power bandwidth +/- 1dB 20-50,000Hz
Frequency response +/- 1dB 20-50,000Hz
THD 20Hz-20kHz UP to rate power 0.05%
Slew rate 20v/microsec.
Damping factor better than 50
Signal to noise ratio 88dB.
Input voltage for maximum 100mV.
Also, the results from this circuit, it is the high-frequency response better output with J49/K134.
The operation of circuit.
The input signal is entered to C1 pass through a low pass filter circuit with R2,C2 to the difference input circuit Q1(MPSA93),Q2(MPSA93) to Q4(MPSA43),Q5(MPSA43) that as act to amplifier a input signal to Input signal to be strong enough to drive the gate of the output MOSFET. (Q8,Q9)
Circuit 50W Power Amplifie OCL Mosfet (K1058 + J162)
The diode (1N4148) D2,D3,D4,D5 It is a protection circuit to drive the gate of the MOSFET is too strong. May cause damage to the power MOSFET.
The Q6(BC546),Q7(BC556) It controls the voltage supplied to the driver. not change follow the swing of the power supply, while we turn on the high power. And prevent noise that feed back to from the power supply wires, thus reducing noise of the circuit as well.
How to build.
This circuit is very easy to make, because it is designed in the PCB module. To reduce oscillators from wire at legs MOSFET too long.
Therefore, every piece of equipment. Including the power MOSFET and the heatsink. So is designed to be installed on the PCB, as shown in Fig. In creating, So just devices connected to form correct, careful soldering point to the closest point of successful, and not Short to well.
PCB 50W Power Amplifie OCL Mosfet (K1058 + J162)
– Check the output MOSFET that insert the mica insulation is good enough or is not. Using Ohmmeter measurement, make sure not to well short circuit or Short to the heat sink is available.
When examining all done, until sure is good to successfully. So trial connected to the voltage of the power supply, to the circuit to work right away.
Source : pk kit circuit