Top Circuits Page 34
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RF amplifier Q3 to diode D1-D4 in the mixer, Q1-Q2 through T1 and T2 provide liquid oxygen injection 10MHz for D1, U1A and U1B and U2 is an audio amplifier. Detailed information is shown in the figure T1 and T2. ..
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The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these....
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This is an image Schematic. No Description available...
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An RF isolator is a seemingly magic device that allows signals to pass in only one direction. Signals applied to the input port are sent to the test port and signals coming into the test port can only go to the output port. This one-way property is usually....
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This project and your efforts will provide you with a 0.55...3 watt input to easily 10 watt output. The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply.....
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No description available...
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No description available...
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175MHz high-frequency amplifier circuit by a field effect transistor shown in Fig. Field effect transistor VT is 3D04H, components, and parameters, ..
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The RF circuit is a C-Class power amplifier . it is used in last stage of transmitters .Its maximum power output is about 1 Watt . the circuit can be used in 3 frequency range 30-100-200MHz...
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The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these....
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The achievement of this 30 watt amp was thought to take place on a heatsink microprocessor PC. Equipped with its fans, the advantage of this method of cooling was chosen for the fact it is common and not very expensive. The size of the printed circuit will....
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This Power amplifier is equiped with a bipolar transistor,the famous MRF317. As lots of FM amplifier application ,the power transistor is in a C class bias. All the impedance networks (Input & Output) have been determined by using the software: Mimp.EXE. A 9....
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The sensitivity of receiver it is possible to increase itself considerably, if is interfered, between this and his aerial, a amplifier RF. The amplifier of circuit, does not use in resonant circuits and for this is suitable, so much for mid waves, what for....
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In this circuit, an NE592 acts as an IF amplifier. DC coupling between mixer and amplifier is practical beacuse different + 6 V and + 12 V supply voltages are used. The voltage at the differential input is about 4.5 V. A narrow bandpass filter for the....
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This is the circuit of a 500 watt linear amplifier, based upon a design by Frits Geerligs, PA0FRI. The circuit uses four PL519 TV line output valves in a very simple circuit that will deliver over 450 watts at 3.5 MHz (350 watts at 30 MHz). PL519 (40KG6A) is....
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When the start switch is pushed, the output of the charger goes to 14.5 V. As the batttery approaches full charge, the charging current decreases and the output voltage is reduced form 14.5V to about 12.5V, terminating the charging process. Transistor Q1....
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This is the circuit of a 500 watt linear amplifier, based upon a design by Frits Geerligs, PA0FRI, who has his own homepage at http://home.planet.nl/~fhvgeerligs. The circuit uses four PL519 TV line output valves in a very simple circuit that will deliver....
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Once again my collection of projects creation has been interrupted by another necessity. Patrick and other people have asked me for a circuit of a VHF power amplifier. These circuits are my "standard" building blocks that can be used to amplify RF power....
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It is quite easy to get a watt or more with very simple equipment, but to get more than 5 watts becomes a little more difficult. This article describes a 10 watt linear amplifier that is capable of delivering over 15 watts into 50 ohms and uses cheap plastic....
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This is a rather unusual QRP Power Amplifier design, with a wide frequency response; within three dB's from 300KHz to 30MHz. Overall gain is in the region of 16dB and the final output power may be well over four watts. The wide bandwidth is a result of the....
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This project was a particular surprise for me in that the BC547 (equiv 2N2222) can be used to build a 500mW linear amplifer covering the entire HF band with excelent spectral purity and no neutralising at all. Ugly-bug construction was used but I dare say....
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This paper describes an RF amplifier circuit which is suitable for the frequencies between
10MHz and 500MHz. These kind of amplifiers are called wide band amplifiers.
Wide band amplifiers are used in communication receivers, RF measuring equipment and....
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FET has high input impedance, high input impedance amplifier can be made. However, FET amplifying device, the distributed capacitance and the Miller effect input capacitance of..
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F733 Integrated wideband amplifiers common-emitter group total wideband amplifier internal feedback circuit is small, zoom capability, good circuit stability, is a common ampli..
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j1PCI663 shame dynamic is input, differential output type of IC, but this circuit has a single-ended output, input..
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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 ..
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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,..
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877 ~ 924MHz RF2152 power amplifier constituting the circuit diagram: ..
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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..
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As shown for the 400MHz broadband differential amplifier circuit. The circuit consists of two parts: the incoming broadband differential amplifier integrated chip OPA660 compos..
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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..
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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..
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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..
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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..
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As shown in FIG constituted by RF2103P 915MHz RF amplifier circuit. P1 for the outlet, which P1-1 take power Vcc, P1-2 ground, P1-3 then power down control voltage VB; J1 to th..
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As shown in FIG constituted by RF2104 830MHz *** amplifier circuit works. Radio frequency (RF) signal from 5 feet input, via a preamplifier, amplified by an amplifier stage aft..
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As shown in FIG constituted by RF2126 2450MHz end-stage linear power amplifier circuit. Radio frequency (RF) signal from the input pin 1, after amplified by the amplifier 7 fee..
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As shown in FIG constituted by RF2324 1880MHz internal amplifier collector bias application circuit. Radio frequency (RF) signal from the input pin 3, via a preamplifier, after..
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By the differential input stage, a differential voltage amplification, a forced differential voltage amplification, slow punch amplified complementary push-pull amplifier outpu..
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CLC221A design with traditional amplifier OP ill, it is a high-performance current-feedback amplifier OP e grand manner using pressure - phase or same phase can be, but with th..
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Car circuit used by the external voltage controlled amplification of wideband amplifiers lC (TL0216); so as to have the compression characteristics 2udB b: input circuit, resis..
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As shown, the circuit consists of a dual time base circuit 556 consisting of two synchronized multivibrator, two output clock..
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The presented project is a function generator for sinusoidal and square signals production. The output frequency covers the range from 10 Hz to 100 KHz with a step of 2 Hz.
The waveform synthesis is based on the D.D.S. technique (Direct Digital Synthesis)....
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This circuit is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. The device formed by Q1, Q2 and related resistors triggers the SCR. Timing is provided by R1, R2 & C1. To change flashing frequency....
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The circuit has both square-wave and triangle-wave output. The left section is similar in function to a comparator circuit that uses positive feedback for hysteresis. The inverting input is biased at one-half the Vcc voltage by resistor R4 and R5. The....
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The use of positive feedback is useful for producing oscillators. The condition for positive feedback is that a portion of the output is combined in phase with the input. For an amplifer with positive feedback the gain is given by the expression below...
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The Astable Multivibrator, which is generally used as a signal generator, is once again used here to generate the desired frequencies. It is an excellent example of the fact, how versatile simple basic electronic circuit can be. It seems quite obvious then,....
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The circuit is based on asynchronous decade counter 7490(IC2), a 7 segment display (D1), and a seven segment decoder/driver IC 7446 (IC1).The seven segment display consists of 7 LEDs labelled a through g. By forward biasing different LEDs, we can display the....
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This circuit is basically simple and easy to build, it uses two transistors as active components and a few passive components like resistors, capacitors and two LEDs.
The circuit makes use of the MPS2222 transistor. You can use any NPN type transistor as....
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Maxim's MAX038 function generator chip is capable of producing nearly constant amplitude sine, square, and triangle waves with a low output impedance, from a very low frequency to more than 20 MHz. Basically, a function generator on a chip. Here is a....
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The applet shows a simulation of Chua's circuit, plotting the voltage measured across C1 against the voltage measured across C2. This corresponds to the display on an X-Y oscilloscope with probes connected across these capacitors. The initial values of the....
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Oscillation frequency 10Hz ~ 20MHz, 6 ranges. Analog output Sine, triangle, square wave (0 ~ 4Vp-p, Zo = 50?). TTL Output Clock (Duty: 50% fixed) positive negative pulse (variable pulse width). Operating system Show: oscillation frequency and operating mode....
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Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in four switched ranges. There are both high and low level outputs which may be adjusted with the level control. This project makes a....
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Astable or free-running multivibrators have been used in home-built amateur radio equipment for many years. The basic circuit is a two stage amplifier with AC-coupled feedback from output to input. One transistor stage is on ( conducting current ) while the....
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This is a very simple circuit utilising a 555 timer IC to generate square wave of frequency that can be adjusted by a potentiometer.
With values given the frequency can be adjusted from a few Hz to several Khz.
To get very low frequencies replace the....
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What exactly is a multivibrator? I suppose one definition would be 'a circuit which has several states'. This will do for now, it's quite loose so leaves plenty to the imagination! Conventional multivibrators have only two stages and come in three flavours:....
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An LC oscillator is driven by pulses which are generated by a 555 IC based oscillator. LC oscillator is built around 2SC2078. The circuit is shown in Fig. 1. The circuit and the Ansoft Designer simulation. Measured and simulated resonance frequencies are....
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555 timer circuit unsteady open and closing times are independent of each other. Wherein a time constant is 1.1RcC2, another time constant is 1.1RcC3. Free-running period is th..
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As illustrated, the 555 (or 556 1/2) and three resistive, capacitive element connected as shown, constitute astable multivibrator mode. And one-shot mode except that only the t..
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As shown for the three astable circuit. From this circuit can be seen, each level of the base of the transistor by a capacitor connected between the two levels are tightly coup..
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Astable multivibrator using too many electronic devices, widely used in the pulse signal generating circuit, which works as 17-18 in FIG. From the figure shows, with A coupling..
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5 min circuit can continue to operate in the state of the power outage, the role to protect the refrigerator. Refrigerator power protection circuit 1136 as shown in FIG. T for ..
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DBS-20-type leakage protection circuit ..
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Current Transformer H11-3 need be made. Choose not less than 2W transformer core, the first secondary winding. With µ0.12mm enameled wire around 1000 turns. Primary use µ1 ~ 4m..
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Current leakage protection is currently the most used and best leakage protection device. Current leakage protector fork into electromagnetic and electronic two, two leakage pr..
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Due to the different circumstances of the various input signals, when the pin is applied between the abnormal voltage, protection circuits to form a circuit path from while LSI..
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Diode and thyristor can withstand over-current and over-voltage of poor, short-term over-voltage over-current will damage the components, but can not complete the full potentia..
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The device circuit works shown in Figure 11. Power outages are frequent thing, but some occasions, the power does not allow (such as the ongoing surgery, etc.). LSE with simple circuit design, fully automated...
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AC power supply voltage is normal, relay, connected to the load (Rfz) circuit. When the load short-circuit failure, KA voltage drop across quickly, KA release, cut off the load..
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Adjusting Ro or RP, you can change over the current setpoint. Circuit shown in Figure 14-98. Overcurrent, V conduction thyristor, transistor VTi, VT2 off immediately cut off th..
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As shown by INA321/322 input current protection circuit shown. INA321/322 has the input end of the inner electrostatic discharge (ESD) protection diodes when the input voltage ..
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As shown for the speaker protection circuitry. It is designed for the left and right channels operate independently. The figure (to the left channel as an example) of R2, C4 an..
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As shown in FIG TDA4866 constituted by an external signal generator circuit protection. The role of the internal protection circuit is out of control, the external protection c..
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As shown in FIG circuit protection circuit is the use of optocouplers or not the on-off control. Voltage is normal, almost no output optocouplers, VT pipe is reverse biased and..
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As shown in FIG grounds INA155/156 constituting the input current protection circuit. INA155 input internally with electrostatic discharge (ESD) protection diodes when the inpu..
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As shown in overload protection circuit power 650mW, supply voltage 12V, speaker 25 ohms. Part Component Specifications: VT1: transistor NB111EH/J VT2: Transistors: NR001E VT3:..
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As shown, the circuit uses a zener diode D1 achieve overvoltage protection, a diode rectifier bridge to achieve reverse voltage protection. Diodes 1.4V loop will cause the maxi..
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As shown, the circuit uses the Zener diode D1 limits the surge voltage, use four diode rectifier bridge to prevent reverse voltage. Zener diode D1 is 36V, optional 1N4753A or P..
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Battery deep discharge would plate curing, shortening the battery life. This could be set discharge protection device. Circuit is shown. When the battery voltage drops to the t..
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Battery discharge will cause plate acidification, affecting the normal life of the battery. To solve this problem, we designed a special micro-power battery over-discharge prot..
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Bidirectional thyristor control. Adjust potentiometer RPi and RPz, you can change the lower and upper limit values. LEDs VLi and VL2 are less pressure and overpressure indicato..
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Both circuits are used to control the thyristor contactor KM action to overcome the break phase protection relay prone to malfunction or refuse to move, and enhanced the sensit..
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By resistive element as an auxiliary neutral point voltage leakage protection circuit, as shown in FIG. Resistance selection should consider the resistance, power consistency r..
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CB85-10 leakage protection circuit diagram, T for the trip coil, SB is the test button, Ri is simulated human resistance ..
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Cable radio broadcasting studio in rural villages and towns with a high-power amplifiers easily damaged, the main reason is the frequent use, no special management, often shutt..
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Capacitor C3 according to cut off the power (ie, VT cutoff) of the delay time to choose. Figure, SB is the reset button after the failure to eliminate. ..
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Circuit as shown, can be used for operating voltage of + 5V SBC power to prevent damage due to over-voltage power supply throughout the SBC. ..
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Circuit is shown, it is used in the power supply circuit can occur in the case of over-voltage grid on or off phase, promptly cut off the power supply to protect power capacito..
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Circuit is shown, which consists of a DC voltage regulator circuit, the delay circuit, overvoltage and undervoltage protection part of the implementation of circuit, and the li..
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Circuit is shown. It comprises an infrared sensor head, electronic switches, audible audio circuit, FM radio circuit. Install it in the bank, the Treasury and other chamber or ..
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Circuit shown in Figure 3-73. The line is to use the power of instantaneous power failure, the self-induced emf generated by the motor to implement now instant shutdown protect..
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Circuit shown in Figure is the use of thermal protection system consisting of circuit MIC2951. The circuit is set by adjusting the temperature threshold R2. ..
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Circuit shown in Figure, + 24V power supply is obtained by the electromagnetic chuck 110V power down. When the electromagnetic chuck circuit make contact JK closed magnechuck C..
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Color TV main power protection circuit ..
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Figure 4-27 (b) line than in Figure 4-27 (a) line more than a capacitor, to improve and increase the output current waveform DC voltage. Figure 4-27 (b) line shown can be used ..
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DC generator automatic voltage regulator circuit is shown in Figure 7-53. This circuit is used to 40kW, 230V DC shunt complex machine, the voltage change rate up to 2.5 percent..
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The electronic fly disinfestation simple and easy system for all electrical fly online, you can wipe out. The apparatus shown..
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Coop automatic controller described in this case, capable of sheds light, temperature and humidity automatically adjusted to increase egg production rate and survival rate of c..
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Cutter is protected by a printed circuit phototransistor constructed to prevent manual feeding mistakenly stepped on the cutter switch and cause accidents. The line at the time..
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Electric power limiter circuit limits the user load, making household appliances in a given normal operating current range when the load exceeds a given value, the power supply..