Frequency Divider , Wave Integrator (Digital to Sawtooth) and High Pass Filter

This was a schematic of a uncontinued project. It was a project to help blind people using HC-SR04 Supersonic Sensors. It used no Proggrammable chips only analog and digital dividers.

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Original Drawing was made in 2017

Digital conversion in 2018. 

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Oscilloscope Data can be found in BLOG