Power amplifier 100w vmosfet 1

Power amp 100W with V-MosFet [1]

Power_amp_100W_Vmosfet_A.gif (14472 bytes)

�� V-MOSFET. �� , �� , �� , �� . �� fet �� [Q3], �� trimmer TR1 �� Q1-2. �� Wilson Q7-8 �� Q10-11 .�� trimmer TR2 �� 100 ma . � �� D2 �� D5 �� R17-19 , �� V-FET �� 14V �� SiO2 , �� . �� . �� 32.6 , �� R18, R6 �� R8, �� . �� . �� V-FET �� , �� . �� , �� . � �� , �� . �� L. Hood �� Wireless Word.

One still designing that it uses in the exit transistor of technology V-mosfet. This transistors to us offer a lot of virtues concerning the simple bipolar transistors, as high speeds, thermic stability, low distortion etc. Beyond this circuit use also other useful solutions as use fet as source of current [ Q3 ], trimmer TR1 with which we match the characteristics of differential amplifier of entry Q1-2. Also extensive is the use of sources of current wilson Q7-8 and Q10-11. With trimmer TR2 regulate the bias current of output stage, in the 100 ma. The use of diodes D2 until D5 in combination with the resistances R17-19, they protect the gates of transistors v-fet from exceeds the voltage � 14V and it creates perforation in very thin layer SiO2, that is used as insulation in the gate. This way of protection is common in all the amplifiers that use these transistors. The total gain of amplifier is 32.6, regulated from the R18, R6 and R8, in the negative feedback. Also is used enough the use of local feedback for stabilisation of operation under all the conditions. Because the transistors v-fet have positive factor of temperature, with result with the increase of temperature is increased also their resistance. This increase has as result the reduction of current that via the transistor, hence also his power. The use of separated supply in the stages of drive and exit, ensures stability and reject of distortion of intermodulation. The initial drawing of is L. Hood and was published by the Wireless Word.

Power supply for 100W amp [1]

Part List

R1=27Kohm	R24=8.2ohm	D1=12V 0.5W Zener
R2-11=4.7Kohm	R25=10ohm 1W	D2.....5=8.2V 1W Zener
R3-4=5.6Kohm	TR1=470ohm trimmer	L1=20 turns 0.6mm on R25
R5=47Kohm	TR2=4.7Kohm trimmer	Q1-2=BC 547
R6=1Kohm	C1=1uF 63V mkt	Q3=2N5460 fet
R7-10-21=22Kohm	C2=1nF 100V*	Q4-5=MPSA93
R8=12ohm	C3=100uF 16V	Q6-8-11=BC182
R9=1Mohm	C4=100nF 100V*	Q7-10=MPSA43
R12=33ohm	C5-7=22uF 16V	Q9=BC212
R13-20=82ohm	C6=4.7pF ceramic	Q12=2SK134 or 2SK135
R14=33ohm	C8=47uF 16V	Q13=2SJ49 or 2SJ50
R15=2.7Kohm	C9=1nF 100V*
R16=270ohm	C10-11=100uF 100V	*polyester or mylar
R17-19=680ohm	C12-14=100nF 250V mkt
R18=33Kohm	C13=150nF 100V mkt
R22-23=0.33ohm 5W	C15=100uF 35V

�� , �� POWER VMOS FET �� [2SK134 or 2SK135] [2SJ49 or 2SJ50], �� , �� Toshiba �� . �� [2SK1530 N-FET �� 2SK135] �� [2SJ201 P-FET �� 2SJ50]. �� -3� �� TO-3 ,�� . �� , �� . �� .

A branding that I want to make, that is in effect for all the amplifiers that I publish and use the POWER VMOS FET of series [ 2SK134 or 2SK135 ] [ 2SJ49 or 2SJ50 ], they are that, more above transistor they are not produced more by the Toshiba and are enough difficult they are found henceforth. They can be replaced with [ 2SK1530 in the place of 2SK135 ] and [ 2SJ201 in the place of 2SJ50 ]. The new transistors are in plastic case ��-3� and no TO-3, bear in bigger supply of operation and have positive factor of temperature. This mean that with the increase of temperature, is increased and the current that is gone through from through the transistor. The new transistors him I have still not tryed and me it would interest to learn if somebody him used also with which results.

Dataseets for 2SK1530

Dataseets for 2SJ201

Sam Electronic Circuits 12/01

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