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RF Amplifier Circuits
RF Amplifier Circuits
The circuit protects a solid-state relay from overloads. The circuit limits current, automatically disconnects the load after
1 500-W Rf Amplifier
The frequency range of this amplifier is 1.8 to 54 MHz. The amount of RF drive required for full output is about 30 W.
6M 100W Linear Amplifier
100 W output at 50 MHz is available from this circuit. Ul and Q2 form a T-R relay driver, switching the amplifie
10 To 15W Atv Linear Amplifier
This amplifier is useful for applications where a 10- to 15-W peak-envelope-power (PEP) signal is needed i
Uhf Tv-Line Amplifier
This circuit offers 10- to 15-dB gain from 400 to 850 MHz and is therefore eminently suitable for situations where th
1296Mhz Rf Amplifier
Using an NEC70083, this 1296-MHz amplifier delivers about 17-dB gain and around 1- to 1.5-dB noise. It is constructed
Broadcast Band Booster
The use of a loop antenna of large size (12 18") provides a large signal pickup at AM broadcast frequencies. It has
Hf Preamplifier Circuit
This HF SW receiver preamplifier is comprised of a broadband toroidal transformer (LI-a and Ll-b), a complex LC network (comprised of a 1600- kHz, high-pass filter and a 32-MHz, low-pass filter), L2 and L3 (26 turns of #26 enameled wire wound on an Amidon Associates T-50-2, red, toroidal core), a pair of resistive attenuators (ATTN1 and ATTN2),...
Broadcast Band Rf Amplifier Circuit
The circuit has a frequency response that ranges from 100 Hz to 3 MHz; the gain is about 30 dB. Field-effect transistor Ql is configured in the common-source self-biased mode; optional resistor R1 allows you to set the input impedance to any desired value. Commonly, it will be 50 . The signal is then direct-coupled to Q2, a common-base circuit...
70Mhz Rf Power Amplifier Circuit
The SD1143 transistor provides a gain of about 14 dB in this circuit. It uses the fact that a 175-MHz device has a much higher gain when used at lower frequencies. The amplifier was originally designed to be used with a transverter.
Miniature Wideband Amplifier Circuit
Except for the coupling and decoupling capacitors, IC1 is a complete wideband amplifier that has a fixed gain of 20 dB to 450 MHz. No external compensation is required. since the NE5205 functions as a gain block, two or more cart be easily cascaded to provide additional amplification. In this circuit, which uses two NE5205S, the overall gain is...
10W 10M Linear Amplifier Circuit
This linear amplifier delivers 10-W PEP output; with 1.25-W drive on 10 m. Tl, T2, and T3 are 10 turns of bifilar windings on an FT-50-43 toroidal core. The transformers are broadband. Filters for other bands, if desired, are shown. Note: use #26 wire for C1 and C2. Use capacitors that are closest to these suggested values. As the operating...
Receiver/Scanner Preamp Circuit
The low-cost Mini-Circuits MAR-X series of chips offer the RF builder a real advantage, with their inherent 50- input and output impedances (needed for RF systems). An MAR-1-based receiver/scanner preamplifier is shown. Ci and C2 are chip capacitors. Use 0.01 for HF, 0.001 for VHF, and 100 pF for above 100 MHz, depending on the low-frequency...
5W 7Mhz Rf Power Amplifier Circuit
The circuit, shown will produce up to 5-W RF output in the 40-m (7 MHz) amateur band. The coils shown are wound on toroidal cores (Armdon Associates Inc.). The part numbers are given in the schematic.
Wideband Preamp Circuit
Motorola MWA 110, 120, or 130 are wideband amplifier ICs. This wideband preamp circuit can be used in many applications. Keep the leads short when constructing the circuitry. PC board layout (shading represents copper) and parts layout. X is the feedthrough wire to the gound plane. All capacitors are 0.1 uF.
1 Watt 2.3 ghz amplifier
Simplicity and repeatability are featured in this 1 watt S-band amplifier design. The design uses an MRF2001 transistor as a common base, Class C amplifier. The amplifier delivers 1 watt output with 8 dB minimum gain at 24 V, and is tunable from 2.25 to 2.35 GHz. Applications include microwave communications equipment and other systems requiring...
5W RF power amplifier
Numbered components are so designated for PC-board layout purposes. C5 and C8 are disc ceramic. C6 and C7 are tantalum or electrolytic. Rl, R2 and R3 are Vi W carbon composition resistors. Silver-mica capacitors may be substituted for polystyrene (P) types.
6-Meter preamplifier provides 20db gain
Cl, C2, and C3 are miniature ceramic or plastic trimmers- Tl (main winding) is 0.34 Âµ,. Use of 11 turns of no. 24 enameled wire on a T37-10 toroid core. The antenna winding has one turn, and Ql the source winding has three turns. T2 primary consists of 11 turns of no. 24 enameled wire on a T37-10 toroid. Tap Ql drain is three turns from C2 the...
Linear analog coupler
Although the output is low level and cannot be loaded significantly without harming -accuracy, a single I.C. operational or instrumentation amplifier can supply both the linear gain and buffering for use with a variety of loads.
6Meter kilowatt amplifier
The amplifier uses a grounded grid circuit with either the Eimac 3CX1000A7 or 8877, ceramic/metal triodes intended for linear service in the HF and VHF ranges. The amp provides the legal power output of 1500 watts PEP and CW service with no effort and requires a driver delivering between 50 and 80 watts at 50 MHz. With a plate voltage of 3000...
1W Linear FM Booster
That RF Amplifier is for boosting small fm transmitters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear with BGY133 or BLY87 and so on. Its power supply has to give 500mA current at 12 Volts. More voltage can boost the distance but the transistors will be burned much earlier than usual.!...
175MHz high-frequency amplifier circuit composed by a field effect transistor
175MHz high-frequency amplifier circuit by a field effect transistor shown in Fig. Field effect transistor VT is 3D04H, components, and parameters,
Use upC1663 broadband amplifier
j1PCI663 shame dynamic is input, differential output type of IC, but this circuit has a single-ended output, input
A double-tuned amplifier circuit
There are two resonant circuits tuned amplifying circuit known as a double tuned amplifier circuit, i.e. the transformer Ti, T2 of the primary and secondary coils are provided has parallel resonance capacitor
FM IF amplifier circuit composed of ceramic filters
It shows a ceramic filter composed of FM IF amplifier circuit, the FM intermediate frequency amplifier circuit mainly by the IF input variable voltage regulator T}, ceramic filters CF1,
877 ~ 924MHz RF2152 power amplifier the circuit diagram
877 ~ 924MHz RF2152 power amplifier constituting the circuit diagram:
Wideband high-frequency amplifier
A wideband high-frequency amplifier is shown, the circuit resistance and capacitance coupling of common emitter amplifier can be used to amplify high frequency signals. When th
400MHz differential amplifier OPA660 BUF601 schematic
As shown for the 400MHz broadband differential amplifier circuit. The circuit consists of two parts: the incoming broadband differential amplifier integrated chip OPA660 compos
RF2132 linear power amplifier circuit diagram
As shown in FIG constitute grounds RF2132 linear power amplifier circuit. Radio frequency (RF) signal from the input pin 3, via a preamplifier, after the last stage power ampli
380MHz RF2175 linear amplifier circuit diagram
As shown in FIG constituted by 380MHz RF2175 linear amplifier application circuit. Radio frequency (RF) signal input from 6 feet, after the preamplifier, after the last stage p
880MHz low-noise amplifier application circuit composed of RF2347
As shown in FIG constituted by 880MHz RF2347 low noise amplifier application circuit. Radio frequency (RF) signal from the input pin 3, after the output of the amplifier 7 feet
915MHz Power Amplifier RF2155 circuit diagram
As shown in FIG constituted by 915MHz RF2155 power amplifier application circuit. Radio frequency (RF) signal from the input pin 7, after the preamplifier, after the last stage
FM Radio Circuits
RF Transmitter Circuits
RF Receiver Circuits
AM Radio Circuits
FM Transmitter Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
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