RF Experiment

Feb/13/2012  pages for experimental purpose project, or a little piece of circuit. 

Homebrew Craft

experimental board 

Fuse based dead bug 

Oscillators

VFO Series-E oscillator

VCO: Improved Series E VCO

VFO:  ultra-audion  LF to VHF

VFO: AM band Oscillator

VFO: hybrid feedback oscillator

Several  Dipper Oscillators

Oscillator amplitude stabilization

CXO: CXO/overtone for TX

CXO: Low distortion  oscillator

CXO: Tune 5th Butler Overtone VHF Oscillator

Fail:  CB Negistor-not work

Miller negative resistance Oscillator

VCO: Negative resistance VCO

VCO: AM Hartley LO

VCO:  Franklin 80Mhz-180Mhz

VCO: CB colpitts 270Mhz-500Mhz

VCO: linearity factor

VCO: Negative VCO Linearity

VCO: Seiler 80Mhz-300Mhz

VCO: Ultra Negtive  100kHz-100Mhz

VCO: Vackar 30Mhz-240Mhz

Ramp: Versatile ramp generator

Sweep: Build  new topology signal source

Sweep: simple Hartley Sweeper

Audio

Audio: 2 stages Transformer Audio PA

Audio: Discrete Power Amplifer

Audio: Discrete Power Amplifer

Audio: low distortion wein bridge

Audio Preamplifier

Audio: Simple power amplifier

Audio: wein sine bridge

Audio: Push Pull PA

RF Amplifer

IF: BJT 2 Stage with AGC

AMP: Simple RF Amplifier

Mixer

Mixer: JFET active mixer

Filter

Green Bobin Filter 

Antenna

Antenna: JFET active antenna