Design Ideas

More Design Ideas

Use an LED matrix horizontally

Using one 5×7 LED matrix horizontally instead of vertically allows the display of two characters instead of one. Read More...

RC-timed shutoff function uses op amp and momentary switch

Battery-operated instrument benefited from auto-power shutdown. Read More...

Use an integrator instead of coupling capacitors

Level-shift a signal with an unknown dc offset to a known offset without ac coupling. Read More...

Stable pulse generator uses matched transistors in a current mirror

Inexpensive dual transistors work as well as do legacy matched pairs. Read More...

Implement an audio-frequency tilt-equalizer filter

Developing the transfer functions lets you customize the filter. Read More...

Circuit provides 70 dB of AGC

A comparator autoranges to ensure that the automatic-gain-control section sees a signal between −60 and −25 dBm, keeping the FET in its linear Read More...

Wireless temperature monitor has data-logging capabilities

You can make a wireless temps system with two ICs. Read More...

Make an asynchronous clock for VPX-based PCIe systems

Careful crystal selection and an FPGA are key to success. Read More...

Use a photoelectric-FET optocoupler as a linear voltage-controlled potentiometer

The circuit takes advantage of an identical photo-FET as a feedback element. Read More...

Simple circuit tests twisted-pair cables

Quickly test a cable containing twisted-wire pairs and detect open or reversed pairs, shorted pairs, and shorts between unrelated pairs. Read More...

Use a boost regulator beyond its rated voltage

Use an external FET in a common-gate cascode configuration. Read More...

Measure an amplifier's THD without external filters

Adding a secondary amplifier boosts the THD to measurable levels. Read More...

Use air-core-coil resistance to estimate inductance

If the coil is tightly wound you do not need the number of turns to calculate inductance. Read More...

Current monitor uses Hall sensor

Use a Hall-effect sensor to measure dc current in the range of 0 to 40A. Read More...

Control your holiday lights with a magic wand

A magnet waved past a Hall-effect sensor does the trick. Read More...

Circuit provides more accurate multiplication

Convert into and out of the sampled-data domain to get an accurate multiplication. Read More...

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