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Category: Inside Circuits Views: 3440 Rank: 10 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.! In any case do not exceed the 15Volts.  The Amp offers 15 dB in the area of 80Mhz to 110 Mhz. L4, L5, and L6 are 5mm diameter air coils, 8 turns, with wire 1mm wire diameter.An easy project, with great results. Datasheet file1: Click here to download 2N4427.pdf datasheet.
Related circuits This amplifier has a high quality circuit that includes full sort circuit protection and very low T.H.D. at full range of frequency. It needs simmetrical power supply +-40V. The power transistors at the output are connected as DARLINGTON and both needs heatsinks. The power can reach 60 watts at 8... Preamplifier For Magnetic Phono Cartridges This amplifier is intended to be added to preamplifiers that have no phono input. Such a phono i Pulse-train-to-sinusoid-converter The circuit letsyou convert a serial pulse stream or sinusoidal input to a sinusoidal output at 1/32 the frequency. By varying the frequency of Vrn, you can achieve an output range ofl07:1-from about 100 kH2 to less than 0.01 H2. The output resembles that of a 5-bit d/a converter operating on... This circuit is basically an op amp with an nal (±10 mV) between pin 2 and 3 and by extra input at pin 5. A current Iabc is injected controlling the current on pin 5, the level of the into this input and this controls the gain of the signal output (pin 6) is controlled, device linerly The resistor capacitor network R1-R2-C1 provides a ramp-type reference voltage superimposed on top of a dc voltage adjustable with the speed-setting potentiometer R2. This reference voltage appearing at the wiper of R2 is balanced against the residual counter emf of the motor through the SCR... 16 bit Analogue to Digital Converter LTC1052 The circuit here is a A/D converter, that consisting of A2, a flip-flop, some doors and a current sink, is based on a current balancing technique. Again, the stabilized LTC 1052 50 no drift of V input 1 ° C is necessary to eliminate the offset errors of aid. When the torque load on the motor increases, its current increases. This current increase is sensed across Rs, and positive feedback is applied to the noninverting terminal of the LH0101, thereby increasing the motor voltage to compensate for the increased torque load. In the monostable mode, the resistor can be replaced by aconstant current source to provide a linear ramp voltage 1W FM Amplifier Circuit (Boost Low Power Transmitters)
Electronic Circuits - General Amplifier Theory 1 - Gain
Comments
Jacks wrote on Aug 3, 2007
Excellent Circuit
123 wrote on Aug 29, 2007
what is the inductance wire number?
nyogonk wrote on Mar 14, 2009
Good circuit
Russ wrote on Jul 27, 2009
Good if you need linear amplification. FM doesn't need linear amplification. A Class C amplifier is all you need. This is , however a good booster if you have a very weak input signal (not enough to drive a class C amp). Suggest your final amplifier be class C for best results.
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