50W Amplifier Circuit TR 3055 , 2955

Welcome to Free circuit dot com,today we come back with audio power amplifier circuit.

Little pieces of sound equipment, but offline. Voltage only + – 35 more than this would not be sure.
5200 to 1943 using 2955 instead of 3055 with offline without any problems.

Sound reasonable … it is the underlying circuit is really Basic. No help at all. To create one would have to select the device a bit. Because there is no such a key enabling Boost Traping, Constance Current Source, Constance Voltage, Tempurature stable control, ect to which the help of these are important in helping maintain stability of operation of the circuit. Listening to other players in the house.

We have PCB and parts layout and real assembly for you see.

50Watt PCB

50 W Parts Layout

50 watts Amplifier circuit

Amplifier circuit today! ,I got the circuit from japan forum which have good detail both circuit diagram ,PCB,part assembly,layout and show case in completed set that you can make with this information for 50 Watts Power Amplifier.

could you read specification thus as below.

Performance
Output Power 50 watts into 8Ω 70 watts into 4Ω
Music Power 77 watts into 8Ω ;105 watts into 4Ω
Frequency response -1dB at 14Hz and 70kHz (at 1W- see Fig.1)
Input sensitivity 0.875V for 50Ω into 8Ω
Harmonic distortion <.05% from 20Hz to 20kHz; typically <.003%
Signal-to-Noise Ratio -114dB unweighted (22Hz to 22kHz); -119dB A-weighted, both with respect to 50W into 8Ω
Damping factor >140dB at 100Hz & 1kHz, with respect to 8Ω and without PTC thermistor
Protection fuses plus “Polyswitch” PTC thermistor .

50 watts Amplifier PCB

50 watts Amplifier componence layout

50 watts amplifer real assembly

50 watts power supply

Power supply wiring

3-24volt regulator

12Vdc to 9,7.5,6 Vdc circuit

This simple converter using a Zener diode and a transistor into a 9V DC 12V DC battery power to the maximum 1A. The circuit is very simple to build, and requires only 3 electronic components, resistors, zener diodes and transistors. The 2N3055 transistors, 1N4738A Zener diode or Zener voltage and the same power. 3W, and possibly wire wound resistor 3R type. Powering a useful tool to use 9V DC.

The output voltage of the following formula:
Zener voltage Vout = + 0.65V, 0.65V, which is the base-emitter voltage of transistor

13.8 Vdc High current power supply circuit 2

The circuit is high current power supply  which is 13.8V at 20A. That, we can get base equipment which seeks to buy easy, IC LM741 ,founction one’s position voltage be stable or regulated at 13.8V.

which can fine decorate a little again. Besides still have the power transistors 2N3055 X4 numbers bring to build parallel perform enlarge current tall arrive at 20Amp Other detail , Please understand in the circuit.

13.8 high current power supply circuit 2

The least expensive method to get a larger transformer would be to remove the old 2000v primary and then re-wind an old microwave transformer. Most of these transformers are rated 1KW or better.

Your local TV or Electronics repair shop may have one or dig one up from the dumpster. Just in case you don’t know, micro-wave transformers can keep their charge (via the connected electronics) for a long time, so be careful! R1 and

R2 are 10 ohm, wire-wound, and at least 5 watts.

Wattage/cooling should be increased accordingly if you decide to beef up the output. For D1 and D2 you can use any power diode like the 1N4002 to 1N4005. If you live in Europe, Australia, or any other country with a 220VAC system, the only different is the transformer. This particular circuit can be constructed to handle up to 1 KiloWatt (1000 watt). If there is enough interest, I can modify this circuit to include a crow-bar circuit, battery backup, or more output in watts, or everything.

  The power output is determined by transformer T1, and power transistors Q1 & Q2. Assume a transformer of about 15A and the chosen transistors of 2N3055 (15A) type, the inverter can supply about 300 watts with the parts shown. If you are good with electronics all you have to do is replace the 2N3055’s and T1 accordingly for more output. It is imperative to mount Q1 and Q2 on large coolribs. If you intend to beef everything up with a couple kilowatts a standard (5″) cooling fan will also be required. If this is the case, the 2N3771 power transistor is a good choice at 30Amps.

 NTE’s replacement, NTE181, is an improved version of the 2N3771 and carries 90volts instead of the 40 volts and can dissipate 200W instead of 2N3771’s 150W. It is mandatory to include at least one suitable fuse and enclose this project in the correct casing. To be really safe you may want to include a primary and secundary fuse for your own protection. You are dealing with 120VAC or 220VAC at respectible amperage so be careful. The powercord also needs to be secured to prevent accidents.

  The 68uF Tantalum capacitors were chosen for their endurance. Normal electrolytic capacitors would overheat and explode. Somesort of cooling fan inside the project case may be a good choice, I myself use a ball-bearing cpu-fan from an old computer. New they don’t cost that much either, about 3 bucks or so.