Design Ideas

More Design Ideas

Hack into a stopwatch to make a phototimer

Two transistors create a pulse train to operate a stopwatch. Read More...

Comparator directly controls power-MOSFET gate

Circuit switching point is independent of unregulated FET voltage. Read More...

AGC circuit uses an analog multiplier

This automatic gain control works over the audio-frequency range. Read More...

Use a self-powered op amp to create a low-leakage rectifier

An amplifier that works at 0.8V is key. Read More...

Simple reverse-polarity-protection circuit has no voltage drop

A relay does what semiconductors can’t do. Read More...

Series-LC-tank VCO breaks tuning-range records

A series tank circuit allows you a 4-to-1 frequency range. Read More...

Circuit controls inrush current in ac-operated power supplies

Inrush current control circuit for ac operated power supplies. Read More...

Save 3 dB of output power using feedback to set the output impedance

You can use this with high-side or low-side output current sensing. Read More...

Optically isolated overcurrent detector works from ac mains

The circuit uses two opto-transistors you arrange for bipolar sensing. Read More...

Simple circuit helps to protect a vehicle-reverse camera

Add a delay to prevent short power pulses as you shift through reverse. Read More...

Eight LEDs make a 100-division voltmeter

Use a counter IC to drive two sets of four LEDs. Read More...

Simple circuit controls the rate of voltage change across a capacitor or another load

The output rate of change servos a pass FET. Read More...

LED bar-graph display represents two digits

Novel circuit uses a reference ladder signal based on the most-significant-digit display. Read More...

Polynomial rotation accelerates CRC calculations

This idea introduces a method of CRC calculation that rotates a polynomial instead of shifting data. Read More...

Simple circuit measures optocoupler's response time

Measure the response speed of optocouplers in order to select matching devices. Read More...

Circuit provides visual verification of IR pulses

Use a transimpedance amplifier to drive an LED. Read More...

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