Zagcom >> Links>> Radio >> Other radio related circuits

	Sign In Sign-Up

Zagcom >> Links>> Radio >> Other radio related circuits

Other radio related circuits ( 29 ) :

Connect two standard office telefax machines via 2 meter ham radio (at 2400 bps) - zipped file

1 Watt C-Class RF Amplifier - auitable for 30 MHz, 100 MHz and 200 MHz
15 Watts RF Amplifier - This circuit will put out a conservatively-rated 15 watts across the FM broadcast band.
300 Watts RF Amplifier - This circuit will put out a conservatively-rated 300 watts across the FM broadcast band.
High-frequency AGC has digital control - 50 mHz AGC circuit
High-frequency VGA has digital control - variable-gain amplifier for ranging from 115 MHz at high gain to 225 MHz at low gain
Wideband AGC has 60-dB dynamic input range - provides more than 60 dB of dynamic input range at 150 MHz

602 Double Balanced Mixer - Philips describe their 602 mixer (SA602A) circuit as "a low-power VHF monolithic double-balanced mixer with input amplifier, on-board oscillator, and voltage regulator. It is intended for high performance, low power communication systems. The guaranteed parameters of the SA602A make this device particularly well suited for cellular radio applications.
Add-on modulator has high bandwidth - converts the output of a continuous-wave (CW) source to either an amplitude-modulation (AM) or a suppressed-carrier-modulation (SCM) format, circuit has unity gain and 50 Ohm input and output impedances, frequency response is flat from 0.3 to 45 MHz
AM Modulator - This circuit is a AM modulator which has been constructed by single Motorolla IC , MC1595G or MC1496G.
Current amp provides frequency modulation - you can use current-feedback op amps in many VHF-band RF applications up to 150 MHz, this frequency modulator that generates a 55-MHz VHF signal
SSB Modulator Draws Only 5mA At 2.7V - SSB modulator circuit
Modulator draws just 5 mA at 2.7V - single-sideband (SSB) modulation uses the frequency spectrum and generates output power more efficiently than does full-amplitude modulatio, generates generates 35- to 80-MHz SSB signals by combining wideband, low-voltage op amps with an IC that integrates all the necessary functions
Single-sideband demodulator covers the HF band

Waveform generator demodulates FM signals - uses the phase-detector signals of a precision waveform-generator IC to perform FM demodulation

900-MHz down converter consumes little power - nonproprietary 900-MHz down converter to 75 MHz by using an 825-MHz local-oscillator signal

Gate Deep Oscillator - This is just a variable oscillator based on a bf245 or k 161 fet. By changing the coil it can generate frequency between 0.5 and 300 MHZ. this circuit is useful to test radio circuit such as filter, receiver, transmitter and so on . It can be use for coil tuning thanks to the 100microamo meter built in.
Low-cost circuit biases VCOs for cable and TV - PLLs are useful in a variety of applications, most notably cable and TV tuners
Op-amp oscillators simplify RF designs - a novel circuit that uses a low-cost, high-speed op amp as a crystal-controlled RF sine-wave oscillator

Cellular Phone Helper - activates a variety of devices when your cellular phone is in use, pdf file
RF Sniffer 500 kHz to 500 MHz

Analysis of pairs of Coax Stubs - article about coaxial stubs for filters on transmitters
Analysis of Single Coax Stub
K2TR Coax Stub Filters
W3LPL Receiving Bandpass Filters - information extracted from a July/August 1985 NCJ article

FM Pre-Emphasis - FM broadcasting in the United States requires a 75us pre-emphasis for proper frequency response at the receiver. This is a high-precision pre-emphasis module that goes in front of the main broadcast limiter, but after the optional sibilance limiter.
Harry's Homebrew Homepage - very many radio related projects
Micro Power FM Broadcasting Circuits - limiter, mixer, antenna, modifications to Ramsey FM10
Radio and RF circuit at Wenzel Associates technical library

back to : Links >> Radio

Our Partners