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Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Electronic Projects

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Circuit separates combined turn/stop signals for separate turn/stop lamps using no added power
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Easy to build digital coil-less (100KHz step size) FM transmitter
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Circuit combines the brake-signal and turn-signal into one lamp with no added power connection
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Radio push-button function is provided by a simple circuit using a CD4011 in a latch configuration
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LV, LP, CC driver allows two alkaline or NiMH cells to steadily power a Red LED until discharged.
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Weight Scale using SFE's OpenScale platform
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PB latch circuit provides on/off delay function to prevent accidental power switching
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Circuit combines PWM controlled constant-current source with 3rd-order filter using one opamp
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Weight Scale built using SFE's OpenScale platform
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Stepper motor driver applies full voltage for fast stepping, then PWM for low power hold
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A simple circuit using the common CD4049 to generate the Radio PB Function
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Damping factor, and how an amplifier controls voice coil motion.
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Notch filter Q is largely independent of component tolerances and notch frequency adjustment.
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One-shot timer uses no power when quiescent, useful for battery powered circuits
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Simple, efficient, lead-acid battery charger auto switches from CC to CV mode
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Circuit applies full actuation power to solenoid with PWM hold reducing power to 12-25% of nominal
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Minimal circuit for auto CC/CV charging. Option allows pot adjustment of charge current.
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Two simple high-side sense current limit circuits adjust to zero current and have low voltage drop
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