project of circuit potency lineal RF amplifier with BLY90 for Fm transmitter or vhf transmitter Circuit for lineal amplifier for VHF with power source and printed circuit board, using the transistor Bly90
It is to be used as amplifier of potency of RF in the high strip of of the power source that should be capable to supply a tension of 13 volts with a current of 10 amperes. it demands right care in the assembly of the source. Terrified armored transformer, and three shocks of RF to filter the components of high frequency.
XRF1 and XRF2 are 30 you turns of wire 25 AWG in a nucleus of ferrite of 1 cm of diameter and 5 cm length. It can use one of a source at/atx bad, it is easier. XRF3 are 100 you turns of wire 25 AWG in a ferrite nucleus and 1cm of diameter for 5cm of length. Or use an usually found in the exits of sources ATX’s. something around 100µH. The capacitors C1, C2, C3, C4 should be ceramic of 600 V or more and the capacitors of 10nF are for 100v. RX cannot be of wire. Power supply circuit for the rf lineal amplifier Orijinal görüntüsünü görmek için buraya tıklayın. 512x223 px. About the transistor BLY90
The Transistor BLY90 was developed to work in the classes THE, B and C, with 12.5V current of 8A. For applications above 175MHZ. Below we have the diagram circuit of the amplifier using an only transistor BLY90. All capacitors should be ceramic. The resistor of 10Ω for 1 w should not be of wire, the entrance impedance and exit is of 50Ω , soon it should be linked with cable of 50Ω . It should be observed the legal restrictions as the operation of that equipment type. Diagram circuit of the project for the rf lineal amplifier Orijinal görüntüsünü görmek için buraya tıklayın. 522x297 px. Printed circuit board for the lineal amplifier with bly90
Below we have the drawing of the printed circuit board of the transmitter, observe that the components are mounted beside the copper and with the terminals the shortest possible, use heatsink in BLY90. lists of material for assembly of the lineal RF potency amplifier Power Supply RX = 22KΩ 1W C1,C2,C3,C4 = 100nF 600V Ceramic C5,C6,C7,C8, =10NF 100V C9 = 100NF C10 = 4700µF C11 = 2200µF D1,D2,D3,D4 = 1N5401 or equivalent. XRF1,XRF2 = 30 turns of wire 25 AWG in nucleus of ferrite of 1cm diameter for 5 length. Optional, use a shock of RF of a computer source, those of the entrance of the net. XRF3 = 100 turns of wire 25 AWG in a nucleus of ferrite of 1 x 5. T1 = Transformer of 12 Volts for 10 Ámperes with screening. Several = box, plugs, cables, etc. Amplifier of RF Q = BLY90 R = 10Ω 2W C1 =15PF C2,C3,C4,C5 = 100PF C6 = 470NF C7,C10,C11 = 470PF C8 = 47PF C9 = 56PF C12 = 22PF CV1,CV2 = TRIMMER 4 – 40PF CV3,CV4 = TRIMMER 60PF MAX. L1 = 3 turns of wire 24 AWG with diameter of 7mm, nucleus of air. L2 = Shock of RF of 0.22µH. L3 = 15 turns of wire 24 AWG around a resistor of 47Ω x 2W (it doesn’t serve as wire) L4 = 3 turns of wire 24 AWG with diameter of 7 mm, nucleus of air. L5 = 1 turns (sees fig. below for details) L6 = 3 turns of wire 24 AWG with diameter of 7 mm., nucleus of air. L7 = 4 turns of wire 24 AWG with diameter of 7mm, nucleus of air. Several = printed circuit board, antenna, cables, heatsink, box, etc. Detail of L5. That project is just for ends of didactic test, that doesn’t implicate in any responsibility of the idealizator about the non operation or illegality of operation of the equipment.
Ahmet UZUN on 14 Mar 12"0-30 VDC STABILIZED POWER SUPPLY WITH CURRENT CONTROL 0.002-3 A 0-30 VDC STABİLİZE GÜÇ KAYNAĞI İLE AKIM KONTROL,002-3 A Orijinal görüntüsünü görmek için buraya tıklayın. 925x541 px. General Description This is a high quality power supply with a continuously variable stabilised output adjustable at any value between 0 and 30VDC. The circuit also incorporates an electronic output current limiter that effectively controls the output current from a few milliamperes (2 mA) to the maximum output of three amperes that the circuit can deliver. This feature makes this power supply indispensable in the experimenters laboratory as it is possible to limit the current to the typical maximum that a circuit under test may require, and power it up then, without any fear that it may be damaged if something goes wrong. There is also a visual indication that the current limiter is in operation so that you can see at a glance that your circuit is exceeding or not its preset limits. Technical Specifications - Characteristics Input Voltage: ................ 24 VAC Input Current: ................ 3 A (max) Output Voltage: ............. 0-30 V adjustable Output Current: ............. 2 mA-3 A adjustable Output Voltage Ripple: . 0.01 % maximum FEATURES - Reduced dimensions, easy construction, simple operation. - Output voltage easily adjustable. - Output current limiting with visual indication. - Complete protection of the supplied device against over loads and malfunction. How it Works To start with, there is a step-down mains transformer with a secondary winding rated at 24 V/3 A, which is connected across the input points of the circuit at pins 1 & 2. (the quality of the supplies output will be directly proportional to the quality of the transformer). The AC voltage of the transformers secondary winding is rectified by the bridge formed by the four diodes D1-D4. The DC voltage taken across the output of the bridge is smoothed by the filter formed by the
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