This is the power amplifier hifi ocl 50 watt, that I made with an all transistors. Because can reduce a noise signal very good, Natures sounds was helps to relax when listens for a long time and economical. Because the number of transistors old, inexpensive and easy to buy.
However, it also has some disadvantages that make it difficult when compared to the use of IC products.
From the circuit below. When we use a power supply +40 V and-40V will be about 50 watts RMS into 8-ohm speaker loads.
You can use the number of transistors used as BD249C, TIP33C, MJE3055, 2N3055 and BD250C, TIP34C, MJE2955, MJ2955 or a or Equivalent number.
This simple audio power amplifier was originally designed for a circuit board workshop, conducted by the OSU IEEE Student Group. At the workshop, 20 participants each constructed this amplifier, by etching and drilling the single sided circuit board, soldering all components, and attaching a pre-built heatsink assembly with the output transistors. Three workshops were held between 1995 to 1996. Though the design is simple, these amplifiers have impressive performance, with a frequency response to approx 40 kHz, very low noise, reasonably fast slew rate, and approx 50 watts (true RMS power) with the proper +/- 40 volt unregulated power supply.
Note: You can see other circuits about 50 watts amplifier below:
+ Power Amplifier OCL 50W by Mosfet (K1058 + J162)
+ Power Amplifier OCL 40W by 2N3055+MJ2955
+ The cheap 100 watt transistor power amplifier project
+ The main amplifier 50 watt OCL by LF351-2N3055-MJ2955 with PCB
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