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Resources by crutschow
Radio push-button function is provided by a simple circuit using a CD4011 in a latch configuration
Single Op amp provides linear, single-ended output for bridge sensor resistance change.
TL431 provides accurate, adjustable voltage crowbar function for circuit overvoltage protection
LV, LP, CC driver allows two alkaline or NiMH cells to steadily power a Red LED until discharged.
Charger performs recommended charging function for rechargeable NiZn batteries
Low parts-count circuit monitors multiple alarm switches, includes arm and entry delays
Lead-acid battery charger using LM317 provides auto CC charge, CV top-off, and final trickle-charge
PB latch circuit provides on/off delay function to prevent accidental power switching
Circuit combines PWM controlled constant-current source with 3rd-order filter using one opamp
Low Power PWM Stepper Motor Driver
2018-08-05
Stepper motor driver applies full voltage for fast stepping, then PWM for low power hold
Electronic Power Rheostat
2018-07-23
Circuit generates an equivalent high power resistance that can be adjusted with a potentiometer.
A simple circuit using the common CD4049 to generate the Radio PB Function
Notch Filter Allows Single Pot Adjustment of Notch Frequency With Little Change In Its High Q Value
2018-06-01
Notch filter Q is largely independent of component tolerances and notch frequency adjustment.
Circuit disconnects battery from operating accessories at a specific voltage to avoid dead battery.
Simple, efficient, lead-acid battery charger auto switches from CC to CV mode
555 One-Shot Timer Has Zero Quiescent Power
2018-04-17
One-shot timer uses no power when quiescent, useful for battery powered circuits
Power Saving DC Solenoid Driver Provides Initial Full Power Actuation Followed By PWM Hold
2018-03-31
Circuit applies full actuation power to solenoid with PWM hold reducing power to 12-25% of nominal
Minimal circuit for auto CC/CV charging. Option allows pot adjustment of charge current.
Two simple high-side sense current limit circuits adjust to zero current and have low voltage drop
Binary ↔ BCD Conversion Using Counters
2018-02-23
Combination of Binary & BCD counters do Binary↔BCD conversions.
