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Conglomerate of signal amplifiers that generate desired outputs from small signal inputs.
Note: All 3 100Hz sine sources are 500mV amplitude with 3V offset to mimic the output from the doppler radar preamp below. Input switches are used to toggle between having a 3V DC input with no AC signal and a 3V DC input with a small AC signal. This is to show how the circuit reacts when motion is detected vs no motion detected near the antenna.
Circuit in the bottom left is a 300MHz doppler radar detector along with filters and a preamplifier that has a DC coupled output at a constant 3V. Obviously a doppler radar will not simulate on here but knock yourself out with building it and testing. Oscillator transistor is a 2SC3355, others could work as well, I haven't tested them. When building keep your wires short and use a coax between the base of the transistor and the RL filter, this circuit will not amplify at all if the 300MHz signal isn't filtered out between stages.
Circuit at the top left will AC couple the doppler output and produce either an amplified DC coupled output or an amplfied AC coupled output. These signals contain information about the Velocity of the source, Distance and Direction of the source as well. Where Frequency = Velocity, Amplitude = Distance, and +/- Voltage signal = Direction (Towards / Away)
Top middle circuit produces low or high pulses depending on whether the doppler signal is high or low, will give the same output amplitude regardless of distance of object being detected, only has a range of a couple of meters.
Top right circuit produces a constant DC output voltage as long as a small AC signal is present on the input.
There, now you have a variety of useful outputs from a doppler radar for you to do with as you choose. All my radar circuit knowledge in one place.
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