50 Watt Amplifier | Electronic Project Circuits

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Power Amplifier OCL 50W by BD250C , BD249C

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.

Part List
R1=4.7 ohm 1/4W R23-25=0.33 ohm / 4W Q8=BD240C [on small Heatsink]
R2-16=47 Kohm 1/4W TR1=5 Kohm Top adjust cermet trim pot Q10=2N3906
R3=10 Kohm 1/4W C1=330pF NPO Capacitor Q11=BD249C [on Heatsink]
R4-5=47 ohm 1/4W C2-3-6-7-12-13=100nF 100V MKT Q12=BD250C [on Heatsink]
R6=3.3 Kohm 1/4W C4-5-8-14=100uF 63V D1-2=12V 0.5W ZENER
R7-8=2.2 Kohm 0.5W C9=47pF NPO Capacitor D3-4-5=1N4002
R9-15=1 Kohm 1/4W C10-11=100uF 16V D6-7-8-9-10=1N4148
R10=6.8 Kohm 1/4W Q1-2-3=BC550C J1=3pin connector with 2.54mm step
R11-17=1.1 Kohm 1/4W Q4=MPSA56 J2=5pin connector with screws
R12-18-19-20-21-22=220 ohm 1/4W Q5-9=2N3904 F1-2=Fuse2A Fast
R13=330 ohm 1/4W Q6=MPSA06
R14=22 Kohm 1/4W Q7=BD239C [on small Heatsink]
Source:http://users.otenet.gr/~athsam/power_amplifier_50w_osu_ieee_eng.htm

Be the first to comment - What do you think? Posted by admin - January 18, 2008 at 5:00 pm

Categories: Power Amplifier Tags: 50 watt amplifier, Class AB Amplifier, ocl amplifier, Transistor amplifier

50W Amplifier OCL with TIP33,TIP34

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.

Read More Source:http://www.pjrc.com/tech/cbw/index.html

Be the first to comment - What do you think? Posted by admin - September 19, 2007 at 9:46 pm

Categories: Power Amplifier Tags: 50 watt amplifier, Transistor amplifier schematic

Power Amplifier OCL 50W by 741+2N3055+MJ2955(with PCB)

This is old circuit Power amp OCL, But easy circuit and very nice. To use for play music in your home. It low cost too.
It use IC 741 or LF351(good) and Transistor x 4 (2N3055+MJ2955+BD139+BD140) and little component. Power supply volt +35V/-35V and 3A for Mono, 5A for Stereo.

Circuit Power Amp OCL by 741+2N3055+MJ2955