Transistor Amplifier Schematic | Electronic Project Circuits

Posts Tagged ‘Transistor amplifier schematic’

Mini Power Amplifier 30W by TIP141 TIP146

Many times we needed a small power amplifier, but good quality, made from distinguishable components. The design does not have any innovation. In the power stage exist a pair of transistors Darlington in package TOP3, which can screwing on a heatsink, putting between them and in the heatsink, suitable leaves mica and silicone ointment on better temperature kidnapping. The bias current regulation becomes with the TR1, as follows. We place in terminally one from resistors R20 or their R21 multimeter binding post, in scale 200mV and we regulate late the TR1 until we take clue 12mV. This voltage dip (fall) corresponds in current 30mA. We thinly leave the amplifier in this regulation for 15 min. without signal in the input and check again. If it need we correct the regulation in 30mA.

R1=1Kohm R16-17=270ohm D1=9.1V 0.4W zener
R2=47Kohm R18=22ohm 1W D2-3=1N4148
R3=1.5Kohm R19=NC Q1-2=BC550C
R4-5=10Kohm R20-21=0.39ohm 4W Q3=MPSA56
R6=5.6Kohm TR1=250ohm trimmer Q4=BC547B
R7=10ohm C1=470nF 100V MKT Q5=BC212
R8=47Kohm C2=1nF 100V MKT Q6=BC183
R9=560ohm C3=68pF ceramic Q7-8=MPSAO6
R10-11=8.2Kohm C4-8=22nF 100V MKT Q9=TIP141
R12-15=120ohm C5-6-7=100nF 100V MKT Q10=TIP146
R13=680ohm C9=47uF 25V F1-2=1.6AT FUSE
R14=330ohm C10-11=220uF 63V All the resistors is 1/4W 1% except quote differently
Source:http://users.otenet.gr/~athsam/power_amplifier_30w.htm

Be the first to comment - What do you think? Posted by admin - February 27, 2008 at 11:58 am

Categories: Power Amplifier Tags: 30 watt amplifier, ocl amp, Small amplifiers, Transistor amplifier schematic

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 60W by 2N3055 with PCB

This is Power Amplifier OCL 60W circuit. It is the circuit that gives bland excellent sound , because of use the transistor entirely (Hot part 2N3055 x 2) have no IC mix. Then may build difficult go to small but for what is the experienced person may have no a problem. For sound power that pay to come out about 60W at 8ohm size loudspeakers s build to sing can bail 12 inch sizes comfortablely. About story of the voltage supply for this circuit as a result the important. Should use the pressure about +/- 40V the trend doesn’t lower 3A .Other detail see in circuit picture.