Design Ideas

Pocket white-LED torch is

This single white-LED torch can be housed in an empty glue-stick tube and has a long rechargeable-battery life. Read Full Story

Gate-drive transformer eases

Use this small transformer to produce four isolated outputs of about 1W each. Read Full Story

One I/O line drives shift

This Design Idea shows how a single microcontroller port can drive a lot of output lines through shift register. Read Full Story

A circuit for mains

Generate independent short pulses at positive- and negative-going AC mains zero crossings. Read Full Story

More Design Ideas

Bender senses shocks

05.14.2013
type: Design Idea
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With the aid of a simple mounting system and some soldered-on weights, a piezoelectric “bender” can detect mechanical shocks. Read More...

Connect a 4×3 matrix keyboard to a microcontroller using two I/O pins

05.08.2013
type: Design Idea
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To connect a 4×3 keyboard requires seven digital I/O pins. This becomes a problem when the project is based on a low-pin-count MCU or when the MCU being used does not have enough free I/O pins. Read More...

Pocket white-LED torch is power efficient

04.30.2013
type: Design Idea
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This single white-LED torch can be housed in an empty glue-stick tube and has a long rechargeable-battery life. Read More...

Recover the leakage energy of a flyback transformer

04.18.2013
type: Design Idea
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This design can recover the leakage energy of a flyback transformer and minimize over-voltage stress to the switching device. Read More...

Gate-drive transformer eases multi-output, isolated dc/dc-converter designs

04.12.2013
type: Design Idea
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Use this small transformer to produce four isolated outputs of about 1W each. Read More...

Two ICs form F/V converter

04.11.2013
type: Design Idea
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Using only six components, you can configure a circuit whose output voltage is proportional to its input frequency. Read More...

Double the protection of a laser driver using a 1V power supply

04.09.2013
type: Design Idea
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Drive a laser pointer with a single cell discharged to as low as 1V, and improve safety reliability with redundant current control transistors. Read More...