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Low parts-count circuit monitors multiple alarm switches, includes arm and entry delays
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Lead-acid battery charger using LM317 provides auto CC charge, CV top-off, and final trickle-charge
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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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Circuit generates an equivalent high power resistance that can be adjusted with a potentiometer.
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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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Circuit disconnects battery from operating accessories at a specific voltage to avoid dead battery.
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Simple, efficient, lead-acid battery charger auto switches from CC to CV mode
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One-shot timer uses no power when quiescent, useful for battery powered circuits
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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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Combination of Binary & BCD counters do Binary↔BCD conversions.
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