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]

Read more source:
http://users.otenet.gr/~athsam/power_amplifier_50w_osu_ieee_eng.htm
Thank you.

This entry was posted on Friday, January 18th, 2008 at 5:00 pm and is filed under Power Amplifier. You can follow any responses to this entry through the RSS 2.0 feed.