2n3055 | Electronic Project Circuits

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24 Watt Class A Amplifier by 2N3055

The supply voltage can be between 34V and 46V and the quiescent current should be set to 1.7A measured through R25 (a voltage of 0.75V must be measured over R25 for a quiescent current of just under 1.7A). R23 is a trimmer and must be set to maximum resistance (10kOhm) when powering up. Then the resistance of R23 must be decreased until the the quiescent current is achieved. If the amplifier is mounted on a big enough heatsink ( 0.6K/W at most) then the amplifier is very safe from thermal runaway. Intelligence must be used when choosing power and voltage ratings of resistors and capacitors.

I have been using this amplifier with a pair of Celestion F20′s and the sound is unbelievable!

Power Supply 0-30V / 0-2A by MC1466L

The basic requirements than one laboratorial power supply, it is to provide voltages and currents of operation that need the usual units, to have low output resistance, low noise, small ripple and good stabilisation. The above requirements are covered, from the circuit. Many power supply allocate electronic safety that him protects from destruction, when short their exit. In the circuit it can be regulated the superior price of output current, in a any price from 0 until 2A and him exceed, even if the load need has bigger requirements. Thus not only auto protection, but simultaneously it can it protects also the unit that it supplies, if the last one has the tendency to pull current bigger than forecasted. The circuit, it can be used still for the control of elements, the mapping out of characteristics of voltage /current and be used as a ideal source of constant voltage – current, capable it gives 0-30V dc and 0-2A, continuously regulated and no in steps. The transformer T1 has two secondary coils. The A coil supplies the circuit of output with high current, via the D1-4, C2 and the B coil, that it supplies the IC1, after is rectified by the D1, C4 and is stabilised by the D7, C5. The current passes through LED D6, who is also useful as clue of operation. The C7 makes compensation of frequency in the internal circuit of IC1 and the R2/D8/D9, him protects from the peaks voltage of network. With R3, we regulate the output voltage, in the point that we want. With the R8, we regulate the limit of current, that we wish in the exit. In the exit of power supply exists one multiple Darlington, constituted from the Q1, Q2 and Q3, Q4 that is parallel.The Resistances R14, R15 ensure the homology of currents of collector, the R10 until R12 improve the DC stability of output circuit, that has basic importance in high temperature, where the reverse currents begin to become considerable. The R9, c10, c11 achieves the compensation of frequency in the output amplifier of IC1 and the D13, his protection. Through the R19 it passes the output current. The fall of voltage that is presented in utmost his is degraded at a percentage and it is applied in the entry of 11 IC1. In the second entry of 10 IC1 is applied a constant voltage, the price of which is regulated by the R8, in the desirable biggest price of output current. As soon as the output current exceed this price, the fall of voltage in the R19, it is applied in the entry of 10 IC1, so that is activated the differential amplifier in the IC1 and it prohibits the further increase of output current. Capacitors C13, C14, C15 make unyoke of exit, while the D15 him protects from the reverse voltage. With instrument VA1, we can measure so much the output voltage, what the current, depending on the place that is placed switch S2. In the place that is appears in the circuit, the switch measure the current, taking sample from the fall of voltage, above in the R19, via the R17, R18. To we measure the voltage it will be supposed we move the switch in the other place, taking sample of output voltage. The micrometer regulation becomes from the R21, R22. The Transistor Q2, should be placed in a small heatsink, as well as the Q3, Q4, in heatsink with thermic resistance 2.6Â° C/W. The regulation of power supply can become easily, with the help of digital multimeter, which we will connect in the exit. Moving and regulating him trimmer in combination with main pontesometer regulation of voltage and current.

Part List

R1= 1.2Kohm 1W R20= 3.9Kohm D6= LED 5mm RED
R2-12= 100ohm R22= 56Kohm D7= 1N5252B
R3= 47Kohm Lin. C1-3= 330nF 250V D8= IN5236B
R4-7-21= 10Kohm trimmer C2= 4700uF 63V D9….14= 1N4002
R5= 8.2Kohm C4= 68uF 63V D15= MR501
R6-10= 12Kohm C5= 47uF 40V Q1= MPSL01
R8= 470ohm Lin. C6-15= 10nF 100V polyester Q2= 2N4923
R9= 1.2Kohm C7-12= 100nF 100V polyester Q3-4= 2N3055
R11= 820ohm C8= 680nF 100V polyester IC1= MC1466L Motorola
R13= 560ohm C9-14= 1uF 40V T1=220VAC/ A:34V/4A B:36V/50mA
R14-15= 0.68ohm 2W C10= 220pF ceramic F1= 1A/250V slow Fuse
R16= 330ohm C11= 10pF ceramic F2= 2A slow Fuse
R17= 470ohm C13= 220uF 40V S1= 2XON/OFF 10A/250V switch
R18= 470ohm trimmer D1-4= 15A Bridge S2= 2X2 ON 1A switch
R19= 0.22ohm 2W D5= 1N4002 VA1= 500Î¼A

13.8V 10A Regulator by 7812 , 2N3055

The power supply circuit is shown in Figures 1 and 2. A 7812 positive 3-terminal regulator is used for the main 13.8V 10A regulator, and this is followed by as many power emitter followers as needed for the current you require. The transistors are not critical. I used 2N3771 devices (50V, 20A, 200W) simply because I had a whole bunch of them in my junk-box. These are pretty much ideal, but I suggest that you use whatever you can get cheaply. If you use 2N3055s (as indicated in the schematic), expect to use four transistors for the first 10A, and one transistor for each additional 5A peak (or 4A continuous) output capability to ensure an adequate safety margin. The voltage rating is unimportant, as the main supply will only be about 22V with an 18V transformer.

As you can see, the regulator is made adjustable over a small range, and will typically give from 11V to 13.8V at full load. With the no-load voltage set to 13.8V (nominal 12V battery voltage), the output will fall to 13.5V at about 1.5A, and 12.8V at around 13A. This is fairly typical of the voltage drops that can be expected in a car installation. Needless to say, if the supply is designed for more current, then the regulation will remain about the same, but at the higher design currents.

Source:http://sound.westhost.com/project77.htm
Thank you.