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Fm-voice-transmitter – Circuit Schematic
Fm-voice-transmitter
This is a sensitive, mini-powered FM transmitter consisting of an rf oscillator section interfaced with a high-sensitivity wide passband audio amplifier and ca...
Tv-transmitter – Circuit Schematic
Tv-transmitter
This transmitter is capable of two levels of rf power. For low-power wireless video, like in a house or office, where simultaneous monitoring of program materi...
80M-amateur-radio-transmitter – Circuit Schematic
80M-amateur-radio-transmitter
This transmitter consists of a keyed crystal oscillator/driver and a high efficiency final, each with a TMOS Power FET as the active element. The total parts c...
Rf-power-switch – Circuit Schematic
Rf-power-switch
This rf power switch operates at 1. 7 MHz with a 50-V source and load. Its on loss is 0.2 dB and its off isolation is 30 dB. It provides 40-W PEP, 45 VrEAK and...
Wideband-signal-splitter – Circuit Schematic
Wideband-signal-splitter
With one HA-2539 or HA-2540 and two low-capacitance switching diodes, signals exceeding 10 MHz can be separated. ...
Rf-wideband-adjustable-agc-amplifier – Circuit Schematic
Rf-wideband-adjustable-agc-amplifier
This circuit functions as a wideband adjustable AGC amplifier. With an effective bandwidth of approximately 10 MHz, it is capable of handling rf input signal...
450Mhz-common-gate-amplifier – Circuit Schematic
450Mhz-common-gate-amplifier
This is a low noise, 3-dB typical NF, amplifier with about 10-dB gain at 450-470 MHz ...
Integrated-am-receiver – Circuit Schematic
Integrated-am-receiver
A crystal Oscillator Ia used so that a narrow·band hybrid IF filter can be used. This circuit has aerial and local oscillator circuits for a 27-MHz receiver...
Simple-ham-band-receiver – Circuit Schematic
Simple-ham-band-receiver
This circuit is configured for the 80m band. The 365-pF, broadcast-band variable capacitor should have a vernier drive with a six-to-one ratio, which makes tun...
Fsk-data-receiver – Circuit Schematic
Fsk-data-receiver
The various signal frequencies are obtained for an incoming carrier centered at 49.86 MHz. The receiver employs double conversion, with i-fs at 10.7 MHz and 45...
Narrow-band-fm-receiver – Circuit Schematic
Narrow-band-fm-receiver
The local oscillator is crystal-controlled and the i-f swing is hardly compressed. The deviation of the transmitted carrier frequency, because of modulation, m...
Fm-mpx-sca-receiver – Circuit Schematic
Fm-mpx-sca-receiver
This receiver is capable of better than 1.5 p, VIHF sensitivity and uses MOSFET front-end circuitry with varactors to eliminate conventional bulky tuning capac...
Am-radio – Circuit Schematic
Am-radio
Coli data l1 0, L10, L2 = Tunong CQ...
Uhf-movement-detector – Circuit Schematic
Uhf-movement-detector
The oscillator is a standard UHF design which delivers about 10 mW at 1.2 GHz. R1 and R2 bias the base of Q1 to 1.2 V via 12. Collector current is set by R3 to...
Rf-probe – Circuit Schematic
Rf-probe
Transistor Q1-configured as a source-follower buffer stage, offering a bit under unity voltage gaingives tbe unit a high-impedance input of about 1 MO shunted ...
Rf-probe – Circuit Schematic
Rf-probe
This rf probe is coupled with a fiber-optiCJ:able to the test equipment. It utilizes inexpensive components to improve probe performance at UHF frequencies. Th...
Phase-detector – Circuit Schematic
Phase-detector
The output of the detector contains a term related to the cosine of the phase angle. Two signals of equal frequency are applied to the inputs. The frequencies ...
Double-sideband-suppressed-carrier-modulator – Circuit Schematic
Double-sideband-suppressed-carrier-modulator
The basic current allows no carrier to be present in the output. By adding offsets to the carrier differential pairs, controlled amounts of carrier appear at t...
Balanced-modulator – Circuit Schematic
Balanced-modulator
When the carrier level is adequate to switch the cross-coupled pair of differential amplifiers, the modu· lation signal, which has been applied to the gate,...
Rf-modulator – Circuit Schematic
Rf-modulator
Because power MOSFETs offer high power gain at both audio and radio frequencies, they are useful in many areas of radio-circuit design. For rf applications, a ...