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A DIY E-bike Conversion on the Cheap

Cars That Think

The handlebar-mounted controls connect with an Arduino, which interprets their settings and translates them into a PPM signal, which is applied to the electronic speed controller. The speed controller is connected to the motor and battery in the usual fashion, with an automotive-type blade fuse in line for safety.

DIY 145
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A DIY E-bike Conversion on the Cheap

Cars That Think

The handlebar-mounted controls connect with an Arduino, which interprets their settings and translates them into a PPM signal, which is applied to the electronic speed controller. The speed controller is connected to the motor and battery in the usual fashion, with an automotive-type blade fuse in line for safety.

DIY 98
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Build Your Own Hi-fi Ear Defenders

Cars That Think

But this tech gets you only so far: Noise cancellation works just for relatively low frequencies, and the overall hearing protection that earbuds can offer is also relatively limited. I was on the hunt for another cheap small MEMS mic that could handle louder sound sources. I found the Vesper VM2020 , with an impressive AOP of 149 dB!

Building 122
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Build a Passive Radar With Software-Defined Radio

Cars That Think

The biggest leap forward happened in 2012 when it was discovered that USB stick TV tuners using the RTL2832U demodulator chip could be tapped to make very cheap but effective SDR receivers. Building off the demand stimulated by this activity, a number of manufacturers have started making premium, but still relatively cheap, SDRs.

Building 100