Design Ideas

More Design Ideas

Use a transistor as a heater

A temperature sensor and a hot transistor hold biological samples at a preset temperature. Read More...

Monitor circuit conserves battery energy

Use a sampled-data technique to lower a monitor circuit’s average power consumption. Read More...

Lamps monitor beat frequency

Synchronize an unknown frequency with a reference to obtain a zero beat by employing a visual monitor for the audio gap surrounding the near-zero Read More...

Use a three-phase rectifier and voltage reducer for offline single-phase supplies

Missing diodes create gaps to allow voltage reduction. Read More...

Simple circuit lets you characterize JFETs

Measure the pinch-off voltage Vp and zero-bias drain current Idss to select matched pairs of JFETs. Read More...

Use a transistor and an ammeter to measure inductance

Bipolar junction transistors transfer a current from a lower-resistance emitter to a higher-resistance collector. You can use this property to Read More...

Condenser microphone uses dc-coupled impedance converter

Eliminate transformers and coupling capacitors in this self-balancing microphone interface. Read More...

Simple sawtooth generator operates at high frequency

Use a digital logic gate to generate an analog waveform. Read More...

Dual regulator handles two input voltages

Use a pair of MOSFETs to switch between 3.3 and 5V regulated voltage. Read More...

Circuit simultaneously delivers square and square root of two input voltages

Perform mathematical computations using analog techniques. Read More...

CMOS gate makes long-duration timers using RC components

Use a common CMOS gate to make long duration timers using low-value RC components. Read More...

Microcontroller drives piezoelectric buzzer at high voltage

Drive the buzzer directly from the μC’s I/O pins. Read More...

Conversion circuit handles binary or BCD

Separate binary and BCD up/down counters permit both binary-to-BCD and BCD-to-binary conversion in one circuit. Read More...

Simple diode serves as a sensor for a thermal probe

A two-transistor thermal probe can be used to diagnose circuit problems, such as hot components and thermal runaway. Read More...

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...

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