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Hi All,
Please see pictures and diagram at ABSE. I duplicated a circuit for someone because they got a bad output waveform. Well I did too. Capacitor = air variable set at 365pf inductor = 41uh aircore With freq set at 1.3Mhz I have the voltages as follows; Collector - 11.8vdc Base - 3.1vac riding on top of 3.2vdc Emitter - 2.5vac riding on top of 3.9vdc (Don't be critical, it's not ac if it sets on dc) As I shift up in freq at about 2.7Mhz the voltages jump. Capacitor = air variable set at 40pf inductor = 41uh aircore Freq = 3.7Mhz Collector - 11.8vdc Base - 10vac riding on top of 1.8vdc emitter - 1.1vac riding on top of 9vdc The base waveform in both senerios is much more sinewave (ish) than the output. Any ideas how to get a decent waveform? The next step will be a buffer, but... Note; original schematic used a crystal, I substituted the LC. Could this be the cause of the distortion? Thanks, Mike |
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