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555 VCO (Voltage Controlled Oscillator) uses constant current control to give wide control range.
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Single Op amp provides linear, single-ended output for bridge sensor resistance change.
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Charger performs recommended charging function for rechargeable NiZn batteries
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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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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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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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Notch filter Q is largely independent of component tolerances and notch frequency adjustment.
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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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Combination of Binary & BCD counters do Binary↔BCD conversions.
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PB alternate action circuit uses CD4013 FF with simple debounce to control relay (or other load).
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Capacitor resonant charging can nearly double the charge efficiency and quadruple energy stored.
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Circuit outputs the min. or max. value of several analog inputs, or provides accurate bi-level clamp
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Watchdog timer circuits, will timeout on either high or low hang
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Just for fun I designed and built this simple circuit which drives a monostable relay by a singol m
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CD4106 PWM circuit uses only 2 diodes, 1 capacitor, and 1 potentiometer
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Circuit generates Av=+1 with simple offset calculation using std. resistor values
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PWM circuit has voltage control of 0% to 100% duty-cycle
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