Radio Theory and design

Friday, July 6, 2018

colpitts oscillator

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The teacher says build the DC bias network first. This is it. In order to have an oscillator I need a resonant circuit. L1, C1 and C2...
Tuesday, July 3, 2018

measuring the input Z

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You could place a pot in series and adjust Vin to 1/2 Vg then the pot would be equal to Zin. If you use this approach and do not measure b...
Friday, June 29, 2018

2N7002 2 Stage AF amp

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This was so simple even I could do it. No math just pick some values to limit the current and set the bias. I'm looking at about 1 ma cu...
Thursday, June 28, 2018

lacing a parallel cable run

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Usually when we lace a bundle we just wrap the string around the wires but what if we want the wires to lay flat? I bent a hook in the ...
Sunday, June 24, 2018

A MW RF amp using the data from the previous post

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500KHz to 1500KHz Expanded range to show more roll-off The yellow is the half power points. The red is the MW band.  Increased ra...
Saturday, June 23, 2018

amp input characteristic vs bandwidth

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Setting the parameters for a stage with a 600 Ohm generator, 10ufd coupling cap, 2.4k Ohm input Z, and 1 nfd input capacitance.  10 Hz ...

high-low corner and frequency response

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The half power point is .707 signal out or when Xc = Rl in a RC coupled circuit. I will show some RC circuits and some transistor amps to ex...
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