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Resources by crutschow
LM317 circuit requires only 3 added transistors to allow zero to maximum current-limit adjustment.
Three-transistor current limit has low voltage drop and adjusts to zero current out
High-side, 2-terminal circuit replaces vehicle mechanical flasher unit.
555 VCO (Voltage Controlled Oscillator) uses constant current control to give wide control range.
Paralleling LM317 regulators for higher current, using TL431 reference for excellent performance
Circuit separates combined turn/stop signals for separate turn/stop lamps using no added power
Circuit combines the brake-signal and turn-signal into one lamp with no added power connection
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.
