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Resources by crutschow

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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Inexpensive, single regulator IC power supply with I and V adj. to zero, includes I & T monitors
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Good for low-drop diode applications, such as blocking battery back-charging or brownout protection
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PB alternate action circuit uses CD4013 FF with simple debounce to control relay (or other load).
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Lead-acid battery charger starts with constant-current and ends with constant-voltage trickle charge
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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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Single +output plus dual +/- tracking output supply using common 3-terminal regulators goes to 0V.
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MOSFET bridge for efficient resistive load rectification, or indifference to input power polarity.
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PWM allows easy control of linear regulator output voltage for μP based power supplies
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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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Constant-current hysteretic buck regulator supply for high power LEDs, efficiency of 90%
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MOSFET Bridge Rectifier gives high efficiency for low voltage, high current AC-DC supplies
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